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93 lines
4.1 KiB
Java
93 lines
4.1 KiB
Java
/* Formattable.java -- Objects which can be passed to a Formatter
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Copyright (C) 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.util;
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/**
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* <p>
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* The <code>Formattable</code> interface is used to provide customised
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* formatting to arbitrary objects via the {@link Formatter}. The
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* {@link #formatTo} method is called for <code>Formattable</code>
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* objects used with the 's' conversion operator, allowing the object
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* to provide its own formatting of its internal data.
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* </p>
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* <p>
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* Thread safety is left up to the implementing class. Thus,
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* {@link Formattable} objects are not guaranteed to be thread-safe,
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* and users should make their own provisions for multiple thread access.
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* </p>
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*
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* @author Tom Tromey (tromey@redhat.com)
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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*/
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public interface Formattable
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{
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/**
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* Formats the object using the supplied formatter to the specification
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* provided by the given flags, width and precision.
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*
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* @param formatter the formatter to use for formatting the object.
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* The formatter gives access to the output stream
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* and locale via {@link Formatter#out()} and
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* {@link Formatter#locale()} respectively.
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* @param flags a bit mask constructed from the flags in the
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* {@link FormattableFlags} class. When no flags
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* are set, the implementing class should use its
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* defaults.
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* @param width the minimum number of characters to include.
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* A value of -1 indicates no minimum. The remaining
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* space is padded with ' ' either on the left
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* (the default) or right (if left justification is
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* specified by the flags).
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* @param precision the maximum number of characters to include.
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* A value of -1 indicates no maximum. This value
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* is applied prior to the minimum (the width). Thus,
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* a value may meet the minimum width initially, but
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* not when the width value is applied, due to
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* characters being removed by the precision value.
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* @throws IllegalFormatException if there is a problem with
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* the syntax of the format
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* specification or a mismatch
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* between it and the arguments.
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*/
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public void formatTo(Formatter formatter, int flags, int width,
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int precision);
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}
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