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533 lines
15 KiB
Java
533 lines
15 KiB
Java
/* CharBuffer.java --
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Copyright (C) 2002, 2003, 2004, 2005 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.nio;
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// GCJ LOCAL: Use RawData instead of gnu.classpath.Pointer
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import gnu.gcj.RawData;
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import java.io.IOException;
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/**
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* @since 1.4
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*/
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public abstract class CharBuffer extends Buffer
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implements Comparable<CharBuffer>, CharSequence, Readable, Appendable
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{
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final int array_offset;
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final char[] backing_buffer;
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CharBuffer (int capacity, int limit, int position, int mark,
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RawData address, char[] backing_buffer, int array_offset)
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{
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super (capacity, limit, position, mark, address);
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this.backing_buffer = backing_buffer;
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this.array_offset = array_offset;
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}
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/**
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* Allocates a new <code>CharBuffer</code> object with a given capacity.
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*/
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public static CharBuffer allocate (int capacity)
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{
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return new CharBufferImpl (capacity);
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}
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/**
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* Wraps a <code>char</code> array into a <code>CharBuffer</code>
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* object.
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*
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* @param array the array to wrap
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* @param offset the offset of the region in the array to wrap
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* @param length the length of the region in the array to wrap
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*
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* @return a new <code>CharBuffer</code> object
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*
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* @exception IndexOutOfBoundsException If the preconditions on the offset
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* and length parameters do not hold
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*/
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public static final CharBuffer wrap(char[] array, int offset, int length)
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{
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return new CharBufferImpl(array, 0, array.length, offset + length, offset,
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-1, false);
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}
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/**
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* Wraps a character sequence into a <code>CharBuffer</code> object.
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*
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* @param seq the sequence to wrap
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*
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* @return a new <code>CharBuffer</code> object
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*/
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public static final CharBuffer wrap(CharSequence seq)
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{
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return wrap(seq, 0, seq.length());
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}
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/**
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* Wraps a character sequence into a <code>CharBuffer</code> object.
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*
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* @param seq the sequence to wrap
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* @param start the index of the first character to wrap
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* @param end the index of the first character not to wrap
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*
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* @return a new <code>CharBuffer</code> object
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*
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* @exception IndexOutOfBoundsException If the preconditions on the offset
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* and length parameters do not hold
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*/
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public static final CharBuffer wrap(CharSequence seq, int start, int end)
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{
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return new CharSequenceBuffer(seq, start, end);
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}
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/**
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* Wraps a <code>char</code> array into a <code>CharBuffer</code>
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* object.
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*
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* @param array the array to wrap
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*
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* @return a new <code>CharBuffer</code> object
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*/
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public static final CharBuffer wrap(char[] array)
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{
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return wrap(array, 0, array.length);
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}
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/**
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* This method transfers <code>char</code>s from this buffer into the given
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* destination array. Before the transfer, it checks if there are fewer than
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* length <code>char</code>s remaining in this buffer.
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*
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* @param dst The destination array
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* @param offset The offset within the array of the first <code>char</code>
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* to be written; must be non-negative and no larger than dst.length.
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* @param length The maximum number of bytes to be written to the given array;
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* must be non-negative and no larger than dst.length - offset.
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*
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* @exception BufferUnderflowException If there are fewer than length
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* <code>char</code>s remaining in this buffer.
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* @exception IndexOutOfBoundsException If the preconditions on the offset
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* and length parameters do not hold.
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*/
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public CharBuffer get (char[] dst, int offset, int length)
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{
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checkArraySize(dst.length, offset, length);
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checkForUnderflow(length);
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for (int i = offset; i < offset + length; i++)
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{
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dst [i] = get ();
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}
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return this;
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}
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/** @since 1.5 */
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public int read(CharBuffer buffer) throws IOException
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{
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// We want to call put(), so we don't manipulate the CharBuffer
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// directly.
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int rem = Math.min(buffer.remaining(), remaining());
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char[] buf = new char[rem];
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get(buf);
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buffer.put(buf);
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return rem;
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}
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/**
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* This method transfers <code>char</code>s from this buffer into the given
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* destination array.
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*
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* @param dst The byte array to write into.
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*
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* @exception BufferUnderflowException If there are fewer than dst.length
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* <code>char</code>s remaining in this buffer.
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*/
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public CharBuffer get (char[] dst)
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{
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return get (dst, 0, dst.length);
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}
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/**
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* Writes the content of the the <code>CharBUFFER</code> src
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* into the buffer. Before the transfer, it checks if there is fewer than
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* <code>src.remaining()</code> space remaining in this buffer.
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*
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* @param src The source data.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer for the remaining <code>char</code>s in the source buffer.
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* @exception IllegalArgumentException If the source buffer is this buffer.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public CharBuffer put (CharBuffer src)
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{
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if (src == this)
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throw new IllegalArgumentException ();
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checkForOverflow(src.remaining());
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if (src.remaining () > 0)
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{
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char[] toPut = new char [src.remaining ()];
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src.get (toPut);
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put (toPut);
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}
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return this;
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}
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/**
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* Writes the content of the the <code>char array</code> src
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* into the buffer. Before the transfer, it checks if there is fewer than
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* length space remaining in this buffer.
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*
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* @param src The array to copy into the buffer.
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* @param offset The offset within the array of the first byte to be read;
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* must be non-negative and no larger than src.length.
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* @param length The number of bytes to be read from the given array;
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* must be non-negative and no larger than src.length - offset.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer for the remaining <code>char</code>s in the source array.
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* @exception IndexOutOfBoundsException If the preconditions on the offset
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* and length parameters do not hold
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public CharBuffer put (char[] src, int offset, int length)
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{
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checkArraySize(src.length, offset, length);
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checkForOverflow(length);
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for (int i = offset; i < offset + length; i++)
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put (src [i]);
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return this;
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}
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/**
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* Writes the content of the the <code>char array</code> src
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* into the buffer.
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*
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* @param src The array to copy into the buffer.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer for the remaining <code>char</code>s in the source array.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public final CharBuffer put (char[] src)
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{
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return put (src, 0, src.length);
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}
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/**
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* Tells whether ot not this buffer is backed by an accessible
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* <code>char</code> array.
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*/
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public final boolean hasArray ()
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{
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return (backing_buffer != null
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&& !isReadOnly ());
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}
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/**
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* Returns the <code>char</code> array that backs this buffer.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only.
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* @exception UnsupportedOperationException If this buffer is not backed
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* by an accessible array.
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*/
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public final char[] array ()
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{
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if (backing_buffer == null)
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throw new UnsupportedOperationException ();
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checkIfReadOnly();
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return backing_buffer;
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}
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/**
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* Returns the offset within this buffer's backing array of the first element.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only.
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* @exception UnsupportedOperationException If this buffer is not backed
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* by an accessible array.
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*/
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public final int arrayOffset ()
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{
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if (backing_buffer == null)
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throw new UnsupportedOperationException ();
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checkIfReadOnly();
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return array_offset;
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}
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/**
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* Calculates a hash code for this buffer.
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*
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* This is done with int arithmetic,
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* where ** represents exponentiation, by this formula:<br>
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* <code>s[position()] + 31 + (s[position()+1] + 30)*31**1 + ... +
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* (s[limit()-1]+30)*31**(limit()-1)</code>.
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* Where s is the buffer data. Note that the hashcode is dependent
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* on buffer content, and therefore is not useful if the buffer
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* content may change.
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*/
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public int hashCode ()
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{
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int hashCode = get(position()) + 31;
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int multiplier = 1;
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for (int i = position() + 1; i < limit(); ++i)
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{
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multiplier *= 31;
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hashCode += (get(i) + 30)*multiplier;
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}
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return hashCode;
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}
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/**
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* Checks if this buffer is equal to obj.
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*/
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public boolean equals (Object obj)
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{
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if (obj instanceof CharBuffer)
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{
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return compareTo ((CharBuffer) obj) == 0;
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}
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return false;
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}
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/**
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* Compares two <code>CharBuffer</code> objects.
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*
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* @exception ClassCastException If obj is not an object derived from
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* <code>CharBuffer</code>.
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*/
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public int compareTo (CharBuffer other)
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{
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int num = Math.min(remaining(), other.remaining());
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int pos_this = position();
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int pos_other = other.position();
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for (int count = 0; count < num; count++)
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{
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char a = get(pos_this++);
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char b = other.get(pos_other++);
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if (a == b)
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continue;
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if (a < b)
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return -1;
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return 1;
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}
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return remaining() - other.remaining();
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}
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/**
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* Returns the byte order of this buffer.
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*/
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public abstract ByteOrder order ();
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/**
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* Reads the <code>char</code> at this buffer's current position,
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* and then increments the position.
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*
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* @exception BufferUnderflowException If there are no remaining
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* <code>char</code>s in this buffer.
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*/
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public abstract char get ();
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/**
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* Writes the <code>char</code> at this buffer's current position,
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* and then increments the position.
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*
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* @exception BufferOverflowException If there no remaining
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* <code>char</code>s in this buffer.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract CharBuffer put (char b);
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/**
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* Absolute get method.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit.
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*/
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public abstract char get (int index);
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/**
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* Absolute put method.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract CharBuffer put (int index, char b);
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/**
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* Compacts this buffer.
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*
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public abstract CharBuffer compact ();
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/**
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* Tells wether or not this buffer is direct.
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*/
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public abstract boolean isDirect ();
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/**
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* Creates a new <code>CharBuffer</code> whose content is a shared
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* subsequence of this buffer's content.
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*/
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public abstract CharBuffer slice ();
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/**
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* Creates a new <code>CharBuffer</code> that shares this buffer's
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* content.
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*/
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public abstract CharBuffer duplicate ();
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/**
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* Creates a new read-only <code>CharBuffer</code> that shares this
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* buffer's content.
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*/
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public abstract CharBuffer asReadOnlyBuffer ();
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/**
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* Returns the remaining content of the buffer as a string.
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*/
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public String toString ()
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{
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if (hasArray ())
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return new String (array (), position (), length ());
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char[] buf = new char [length ()];
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int pos = position ();
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get (buf, 0, buf.length);
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position (pos);
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return new String (buf);
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}
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/**
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* Returns the length of the remaining chars in this buffer.
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*/
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public final int length ()
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{
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return remaining ();
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}
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/**
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* Creates a new character buffer that represents the specified subsequence
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* of this buffer, relative to the current position.
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*
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* @exception IndexOutOfBoundsException If the preconditions on start and
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* end do not hold.
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*/
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public abstract CharSequence subSequence (int start, int length);
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/**
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* Relative put method.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer.
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* @exception IndexOutOfBoundsException If the preconditions on the start
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* and end parameters do not hold.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public CharBuffer put (String str, int start, int length)
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{
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return put (str.toCharArray (), start, length);
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}
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/**
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* Relative put method.
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*
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* @exception BufferOverflowException If there is insufficient space in this
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* buffer.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public final CharBuffer put (String str)
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{
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return put (str.toCharArray (), 0, str.length ());
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}
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/**
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* Returns the character at <code>position() + index</code>.
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*
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* @exception IndexOutOfBoundsException If index is negative not smaller than
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* <code>remaining()</code>.
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*/
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public final char charAt (int index)
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{
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if (index < 0
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|| index >= remaining ())
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throw new IndexOutOfBoundsException ();
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return get (position () + index);
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}
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/** @since 1.5 */
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public CharBuffer append(char c)
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{
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put(c);
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return this;
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}
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/** @since 1.5 */
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public CharBuffer append(CharSequence cs)
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{
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put(cs == null ? "null" : cs.toString());
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return this;
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}
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/** @since 1.5 */
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public CharBuffer append(CharSequence cs, int start, int end)
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{
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put(cs == null ? "null" : cs.subSequence(start, end).toString());
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return this;
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}
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}
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