mirror of git://gcc.gnu.org/git/gcc.git
100 lines
3.8 KiB
Java
100 lines
3.8 KiB
Java
/* CharSequence.java -- Anything that has an indexed sequence of chars
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Copyright (C) 2001, 2002 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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/**
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* General functions on a sequence of chars. This interface is implemented
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* by <code>String</code>, <code>StringBuffer</code> and
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* <code>CharBuffer</code> to give a uniform way to get chars at a certain
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* index, the number of characters in the sequence and a subrange of the
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* chars. Indexes start at 0 and the last index is <code>length()-1</code>.
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*
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* <p>Even when classes implement this interface they are not always
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* exchangeble because they might implement their compare, equals or hash
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* function differently. This means that in general one should not use a
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* <code>CharSequence</code> as keys in collections since two sequences
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* with the same chars at the same indexes with the same length might not
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* have the same hash code, be equal or be comparable since the are
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* represented by different classes.
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*
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* @author Mark Wielaard (mark@klomp.org)
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* @since 1.4
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* @status updated to 1.4
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*/
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public interface CharSequence
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{
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/**
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* Returns the character at the given index.
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*
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* @param i the index to retrieve from
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* @return the character at that location
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* @throws IndexOutOfBoundsException if i < 0 || i >= length() - 1
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*/
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char charAt(int i);
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/**
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* Returns the length of the sequence. This is the number of 16-bit
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* characters in the sequence, which may differ from the length of the
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* underlying encoding.
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*
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* @return the sequence length
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*/
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int length();
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/**
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* Returns a new <code>CharSequence</code> of the indicated range.
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*
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* @param begin the start index (inclusive)
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* @param end the end index (exclusive)
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* @return a subsequence of this
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* @throws IndexOutOfBoundsException if begin > end || begin < 0 ||
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* end > length()
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*/
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CharSequence subSequence(int begin, int end);
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/**
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* Returns the complete <code>CharSequence</code> as a <code>String</code>.
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* Classes that implement this interface should return a <code>String</code>
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* which contains only the characters in the sequence in the correct order.
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*
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* @return the character sequence as a String
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*/
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String toString();
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}
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