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707 lines
22 KiB
Java
707 lines
22 KiB
Java
/* StringBuilder.java -- Unsynchronized growable strings
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2008
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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import java.io.Serializable;
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/**
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* <code>StringBuilder</code> represents a changeable <code>String</code>.
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* It provides the operations required to modify the
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* <code>StringBuilder</code>, including insert, replace, delete, append,
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* and reverse. It like <code>StringBuffer</code>, but is not
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* synchronized. It is ideal for use when it is known that the
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* object will only be used from a single thread.
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*
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* <p><code>StringBuilder</code>s are variable-length in nature, so even if
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* you initialize them to a certain size, they can still grow larger than
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* that. <em>Capacity</em> indicates the number of characters the
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* <code>StringBuilder</code> can have in it before it has to grow (growing
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* the char array is an expensive operation involving <code>new</code>).
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*
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* <p>Incidentally, compilers often implement the String operator "+"
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* by using a <code>StringBuilder</code> operation:<br>
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* <code>a + b</code><br>
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* is the same as<br>
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* <code>new StringBuilder().append(a).append(b).toString()</code>.
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*
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* <p>Classpath's StringBuilder is capable of sharing memory with Strings for
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* efficiency. This will help when a StringBuilder is converted to a String
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* and the StringBuilder is not changed after that (quite common when
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* performing string concatenation).
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*
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* @author Paul Fisher
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* @author John Keiser
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* @author Tom Tromey
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* @author Eric Blake (ebb9@email.byu.edu)
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* @see String
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* @see StringBuffer
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*
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* @since 1.5
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*/
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public final class StringBuilder
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extends AbstractStringBuffer
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implements Serializable, CharSequence, Appendable
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{
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// Implementation note: if you change this class, you usually will
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// want to change StringBuffer as well.
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/**
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* For compatability with Sun's JDK
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*/
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private static final long serialVersionUID = 4383685877147921099L;
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/**
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* Create a new StringBuilder with default capacity 16.
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*/
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public StringBuilder()
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{
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super();
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}
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/**
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* Create an empty <code>StringBuilder</code> with the specified initial
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* capacity.
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*
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* @param capacity the initial capacity
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* @throws NegativeArraySizeException if capacity is negative
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*/
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public StringBuilder(int capacity)
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{
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super(capacity);
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}
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/**
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* Create a new <code>StringBuilder</code> with the characters in the
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* specified <code>String</code>. Initial capacity will be the size of the
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* String plus 16.
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*
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* @param str the <code>String</code> to convert
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* @throws NullPointerException if str is null
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*/
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public StringBuilder(String str)
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{
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super(str);
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}
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/**
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* Create a new <code>StringBuilder</code> with the characters in the
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* specified <code>CharSequence</code>. Initial capacity will be the
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* length of the sequence plus 16; if the sequence reports a length
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* less than or equal to 0, then the initial capacity will be 16.
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*
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* @param seq the initializing <code>CharSequence</code>
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* @throws NullPointerException if str is null
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*/
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public StringBuilder(CharSequence seq)
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{
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super(seq);
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}
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/**
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* Get the length of the <code>String</code> this <code>StringBuilder</code>
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* would create. Not to be confused with the <em>capacity</em> of the
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* <code>StringBuilder</code>.
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*
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* @return the length of this <code>StringBuilder</code>
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* @see #capacity()
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* @see #setLength(int)
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*/
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public int length()
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{
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return count;
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}
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/**
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* Get the total number of characters this <code>StringBuilder</code> can
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* support before it must be grown. Not to be confused with <em>length</em>.
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*
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* @return the capacity of this <code>StringBuilder</code>
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* @see #length()
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* @see #ensureCapacity(int)
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*/
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public int capacity()
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{
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return value.length;
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}
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/**
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* Append the <code>String</code> value of the argument to this
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* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
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* to <code>String</code>.
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*
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* @param obj the <code>Object</code> to convert and append
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* @return this <code>StringBuilder</code>
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* @see String#valueOf(Object)
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* @see #append(String)
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*/
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public StringBuilder append(Object obj)
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{
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super.append(obj);
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return this;
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}
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/**
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* Append the <code>String</code> to this <code>StringBuilder</code>. If
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* str is null, the String "null" is appended.
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*
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* @param str the <code>String</code> to append
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* @return this <code>StringBuilder</code>
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*/
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public StringBuilder append(String str)
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{
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super.append(str);
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return this;
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}
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/**
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* Append the <code>StringBuilder</code> value of the argument to this
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* <code>StringBuilder</code>. This behaves the same as
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* <code>append((Object) stringBuffer)</code>, except it is more efficient.
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*
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* @param stringBuffer the <code>StringBuilder</code> to convert and append
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* @return this <code>StringBuilder</code>
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* @see #append(Object)
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*/
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public StringBuilder append(StringBuffer stringBuffer)
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{
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super.append(stringBuffer);
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return this;
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}
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/**
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* Append the <code>char</code> array to this <code>StringBuilder</code>.
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* This is similar (but more efficient) than
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* <code>append(new String(data))</code>, except in the case of null.
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*
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* @param data the <code>char[]</code> to append
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* @return this <code>StringBuilder</code>
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* @throws NullPointerException if <code>str</code> is <code>null</code>
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* @see #append(char[], int, int)
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*/
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public StringBuilder append(char[] data)
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{
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super.append(data, 0, data.length);
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return this;
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}
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/**
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* Append part of the <code>char</code> array to this
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* <code>StringBuilder</code>. This is similar (but more efficient) than
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* <code>append(new String(data, offset, count))</code>, except in the case
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* of null.
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*
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* @param data the <code>char[]</code> to append
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* @param offset the start location in <code>str</code>
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* @param count the number of characters to get from <code>str</code>
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* @return this <code>StringBuilder</code>
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* @throws NullPointerException if <code>str</code> is <code>null</code>
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* @throws IndexOutOfBoundsException if offset or count is out of range
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* (while unspecified, this is a StringIndexOutOfBoundsException)
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*/
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public StringBuilder append(char[] data, int offset, int count)
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{
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super.append(data, offset, count);
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return this;
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}
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/**
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* Append the <code>String</code> value of the argument to this
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* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
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* to <code>String</code>.
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*
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* @param bool the <code>boolean</code> to convert and append
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* @return this <code>StringBuilder</code>
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* @see String#valueOf(boolean)
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*/
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public StringBuilder append(boolean bool)
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{
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super.append(bool);
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return this;
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}
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/**
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* Append the <code>char</code> to this <code>StringBuilder</code>.
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*
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* @param ch the <code>char</code> to append
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* @return this <code>StringBuilder</code>
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*/
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public StringBuilder append(char ch)
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{
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super.append(ch);
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return this;
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}
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/**
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* Append the characters in the <code>CharSequence</code> to this
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* buffer.
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*
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* @param seq the <code>CharSequence</code> providing the characters
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* @return this <code>StringBuilder</code>
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*/
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public StringBuilder append(CharSequence seq)
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{
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super.append(seq, 0, seq.length());
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return this;
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}
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/**
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* Append some characters from the <code>CharSequence</code> to this
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* buffer. If the argument is null, the four characters "null" are
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* appended.
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*
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* @param seq the <code>CharSequence</code> providing the characters
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* @param start the starting index
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* @param end one past the final index
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* @return this <code>StringBuilder</code>
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*/
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public StringBuilder append(CharSequence seq, int start,
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int end)
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{
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super.append(seq, start, end);
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return this;
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}
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/**
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* Append the <code>String</code> value of the argument to this
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* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
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* to <code>String</code>.
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*
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* @param inum the <code>int</code> to convert and append
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* @return this <code>StringBuilder</code>
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* @see String#valueOf(int)
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*/
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// This is native in libgcj, for efficiency.
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public StringBuilder append(int inum)
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{
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super.append(inum);
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return this;
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}
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/**
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* Append the <code>String</code> value of the argument to this
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* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
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* to <code>String</code>.
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*
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* @param lnum the <code>long</code> to convert and append
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* @return this <code>StringBuilder</code>
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* @see String#valueOf(long)
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*/
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public StringBuilder append(long lnum)
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{
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super.append(lnum);
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return this;
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}
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/**
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* Append the <code>String</code> value of the argument to this
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* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
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* to <code>String</code>.
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*
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* @param fnum the <code>float</code> to convert and append
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* @return this <code>StringBuilder</code>
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* @see String#valueOf(float)
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*/
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public StringBuilder append(float fnum)
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{
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super.append(fnum);
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return this;
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}
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/**
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* Append the <code>String</code> value of the argument to this
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* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
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* to <code>String</code>.
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*
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* @param dnum the <code>double</code> to convert and append
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* @return this <code>StringBuilder</code>
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* @see String#valueOf(double)
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*/
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public StringBuilder append(double dnum)
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{
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super.append(dnum);
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return this;
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}
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/**
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* Append the code point to this <code>StringBuilder</code>.
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* This is like #append(char), but will append two characters
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* if a supplementary code point is given.
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*
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* @param code the code point to append
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* @return this <code>StringBuilder</code>
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* @see Character#toChars(int, char[], int)
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* @since 1.5
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*/
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public StringBuilder appendCodePoint(int code)
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{
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super.appendCodePoint(code);
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return this;
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}
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/**
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* Delete characters from this <code>StringBuilder</code>.
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* <code>delete(10, 12)</code> will delete 10 and 11, but not 12. It is
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* harmless for end to be larger than length().
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*
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* @param start the first character to delete
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* @param end the index after the last character to delete
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* @return this <code>StringBuilder</code>
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* @throws StringIndexOutOfBoundsException if start or end are out of bounds
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*/
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public StringBuilder delete(int start, int end)
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{
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super.delete(start, end);
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return this;
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}
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/**
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* Delete a character from this <code>StringBuilder</code>.
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*
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* @param index the index of the character to delete
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* @return this <code>StringBuilder</code>
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* @throws StringIndexOutOfBoundsException if index is out of bounds
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*/
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public StringBuilder deleteCharAt(int index)
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{
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super.deleteCharAt(index);
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return this;
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}
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/**
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* Replace characters between index <code>start</code> (inclusive) and
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* <code>end</code> (exclusive) with <code>str</code>. If <code>end</code>
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* is larger than the size of this StringBuilder, all characters after
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* <code>start</code> are replaced.
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*
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* @param start the beginning index of characters to delete (inclusive)
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* @param end the ending index of characters to delete (exclusive)
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* @param str the new <code>String</code> to insert
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* @return this <code>StringBuilder</code>
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* @throws StringIndexOutOfBoundsException if start or end are out of bounds
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* @throws NullPointerException if str is null
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*/
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public StringBuilder replace(int start, int end, String str)
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{
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super.replace(start, end, str);
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return this;
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}
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/**
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* Creates a substring of this StringBuilder, starting at a specified index
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* and ending at the end of this StringBuilder.
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*
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* @param beginIndex index to start substring (base 0)
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* @return new String which is a substring of this StringBuilder
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* @throws StringIndexOutOfBoundsException if beginIndex is out of bounds
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* @see #substring(int, int)
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*/
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public String substring(int beginIndex)
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{
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return substring(beginIndex, count);
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}
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/**
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* Creates a substring of this StringBuilder, starting at a specified index
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* and ending at one character before a specified index. This is implemented
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* the same as <code>substring(beginIndex, endIndex)</code>, to satisfy
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* the CharSequence interface.
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*
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* @param beginIndex index to start at (inclusive, base 0)
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* @param endIndex index to end at (exclusive)
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* @return new String which is a substring of this StringBuilder
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* @throws IndexOutOfBoundsException if beginIndex or endIndex is out of
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* bounds
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* @see #substring(int, int)
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*/
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public CharSequence subSequence(int beginIndex, int endIndex)
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{
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return substring(beginIndex, endIndex);
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}
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/**
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* Creates a substring of this StringBuilder, starting at a specified index
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* and ending at one character before a specified index.
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*
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* @param beginIndex index to start at (inclusive, base 0)
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* @param endIndex index to end at (exclusive)
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* @return new String which is a substring of this StringBuilder
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* @throws StringIndexOutOfBoundsException if beginIndex or endIndex is out
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* of bounds
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*/
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public String substring(int beginIndex, int endIndex)
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{
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int len = endIndex - beginIndex;
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if (beginIndex < 0 || endIndex > count || endIndex < beginIndex)
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throw new StringIndexOutOfBoundsException();
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if (len == 0)
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return "";
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return new String(value, beginIndex, len);
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}
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/**
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* Insert a subarray of the <code>char[]</code> argument into this
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* <code>StringBuilder</code>.
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*
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* @param offset the place to insert in this buffer
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* @param str the <code>char[]</code> to insert
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* @param str_offset the index in <code>str</code> to start inserting from
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* @param len the number of characters to insert
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* @return this <code>StringBuilder</code>
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* @throws NullPointerException if <code>str</code> is <code>null</code>
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* @throws StringIndexOutOfBoundsException if any index is out of bounds
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*/
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public StringBuilder insert(int offset,
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char[] str, int str_offset, int len)
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{
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super.insert(offset, str, str_offset, len);
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return this;
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}
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/**
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* Insert the <code>String</code> value of the argument into this
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* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
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* to <code>String</code>.
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*
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* @param offset the place to insert in this buffer
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* @param obj the <code>Object</code> to convert and insert
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* @return this <code>StringBuilder</code>
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* @exception StringIndexOutOfBoundsException if offset is out of bounds
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* @see String#valueOf(Object)
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*/
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public StringBuilder insert(int offset, Object obj)
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{
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super.insert(offset, obj);
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return this;
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}
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/**
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* Insert the <code>String</code> argument into this
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* <code>StringBuilder</code>. If str is null, the String "null" is used
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* instead.
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*
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* @param offset the place to insert in this buffer
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* @param str the <code>String</code> to insert
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* @return this <code>StringBuilder</code>
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* @throws StringIndexOutOfBoundsException if offset is out of bounds
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*/
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public StringBuilder insert(int offset, String str)
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|
{
|
|
super.insert(offset, str);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>CharSequence</code> argument into this
|
|
* <code>StringBuilder</code>. If the sequence is null, the String
|
|
* "null" is used instead.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param sequence the <code>CharSequence</code> to insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws IndexOutOfBoundsException if offset is out of bounds
|
|
*/
|
|
public StringBuilder insert(int offset, CharSequence sequence)
|
|
{
|
|
super.insert(offset, sequence);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert a subsequence of the <code>CharSequence</code> argument into this
|
|
* <code>StringBuilder</code>. If the sequence is null, the String
|
|
* "null" is used instead.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param sequence the <code>CharSequence</code> to insert
|
|
* @param start the starting index of the subsequence
|
|
* @param end one past the ending index of the subsequence
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws IndexOutOfBoundsException if offset, start,
|
|
* or end are out of bounds
|
|
*/
|
|
public StringBuilder insert(int offset, CharSequence sequence,
|
|
int start, int end)
|
|
{
|
|
super.insert(offset, sequence, start, end);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>char[]</code> argument into this
|
|
* <code>StringBuilder</code>.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param data the <code>char[]</code> to insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws NullPointerException if <code>data</code> is <code>null</code>
|
|
* @throws StringIndexOutOfBoundsException if offset is out of bounds
|
|
* @see #insert(int, char[], int, int)
|
|
*/
|
|
public StringBuilder insert(int offset, char[] data)
|
|
{
|
|
super.insert(offset, data);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>String</code> value of the argument into this
|
|
* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
|
|
* to <code>String</code>.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param bool the <code>boolean</code> to convert and insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws StringIndexOutOfBoundsException if offset is out of bounds
|
|
* @see String#valueOf(boolean)
|
|
*/
|
|
public StringBuilder insert(int offset, boolean bool)
|
|
{
|
|
super.insert(offset, bool);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>char</code> argument into this <code>StringBuilder</code>.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param ch the <code>char</code> to insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws StringIndexOutOfBoundsException if offset is out of bounds
|
|
*/
|
|
public StringBuilder insert(int offset, char ch)
|
|
{
|
|
super.insert(offset, ch);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>String</code> value of the argument into this
|
|
* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
|
|
* to <code>String</code>.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param inum the <code>int</code> to convert and insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws StringIndexOutOfBoundsException if offset is out of bounds
|
|
* @see String#valueOf(int)
|
|
*/
|
|
public StringBuilder insert(int offset, int inum)
|
|
{
|
|
super.insert(offset, inum);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>String</code> value of the argument into this
|
|
* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
|
|
* to <code>String</code>.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param lnum the <code>long</code> to convert and insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws StringIndexOutOfBoundsException if offset is out of bounds
|
|
* @see String#valueOf(long)
|
|
*/
|
|
public StringBuilder insert(int offset, long lnum)
|
|
{
|
|
super.insert(offset, lnum);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>String</code> value of the argument into this
|
|
* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
|
|
* to <code>String</code>.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param fnum the <code>float</code> to convert and insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws StringIndexOutOfBoundsException if offset is out of bounds
|
|
* @see String#valueOf(float)
|
|
*/
|
|
public StringBuilder insert(int offset, float fnum)
|
|
{
|
|
super.insert(offset, fnum);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Insert the <code>String</code> value of the argument into this
|
|
* <code>StringBuilder</code>. Uses <code>String.valueOf()</code> to convert
|
|
* to <code>String</code>.
|
|
*
|
|
* @param offset the place to insert in this buffer
|
|
* @param dnum the <code>double</code> to convert and insert
|
|
* @return this <code>StringBuilder</code>
|
|
* @throws StringIndexOutOfBoundsException if offset is out of bounds
|
|
* @see String#valueOf(double)
|
|
*/
|
|
public StringBuilder insert(int offset, double dnum)
|
|
{
|
|
super.insert(offset, dnum);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Reverse the characters in this StringBuilder. The same sequence of
|
|
* characters exists, but in the reverse index ordering.
|
|
*
|
|
* @return this <code>StringBuilder</code>
|
|
*/
|
|
public StringBuilder reverse()
|
|
{
|
|
super.reverse();
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Convert this <code>StringBuilder</code> to a <code>String</code>. The
|
|
* String is composed of the characters currently in this StringBuilder. Note
|
|
* that the result is a copy, and that future modifications to this buffer
|
|
* do not affect the String.
|
|
*
|
|
* @return the characters in this StringBuilder
|
|
*/
|
|
public String toString()
|
|
{
|
|
return new String(this);
|
|
}
|
|
|
|
}
|