| /* CharBuffer.java -- |
| Copyright (C) 2007 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.nio; |
| |
| /** |
| * A CharBuffer that wraps a {@link CharSequence}. |
| */ |
| final class CharSequenceBuffer |
| extends CharBuffer |
| { |
| |
| /** |
| * The wrapped char sequence. |
| */ |
| private CharSequence charSequence; |
| |
| /** |
| * Creates a new CharSequenceBuffer. |
| * |
| * @param charSeq the CharSequence to wrap |
| * @param capacity the capacity |
| * @param limit the limit |
| * @param position the position |
| * @param mark the mark |
| * @param offs the offset |
| */ |
| CharSequenceBuffer(CharSequence charSeq, int capacity, int limit, |
| int position, int mark, int offs) |
| { |
| super(capacity, limit, position, mark); |
| charSequence = charSeq; |
| array_offset = offs; |
| } |
| |
| /** |
| * Creates a new instance of CharSequenceBuffer, wrapping the specified |
| * {@link CharSequence}. |
| * |
| * @param charSeq the char sequence to wrap |
| * @param start the start index in the char sequence |
| * @param end the end index in the char sequence |
| */ |
| CharSequenceBuffer(CharSequence charSeq, int start, int end) |
| { |
| this(charSeq, charSeq.length(), end, start, -1, 0); |
| } |
| |
| /** |
| * Returns a read-only view of this buffer. |
| */ |
| public CharBuffer asReadOnlyBuffer() |
| { |
| return duplicate(); |
| } |
| |
| /** |
| * This buffer class is not writable by definition and thus throws |
| * a ReadOnlyBufferException here. |
| */ |
| public CharBuffer compact() |
| { |
| throw new ReadOnlyBufferException(); |
| } |
| |
| /** |
| * Returns a duplicate of this buffer. |
| * |
| * @return a duplicate of this buffer |
| */ |
| public CharBuffer duplicate() |
| { |
| return new CharSequenceBuffer(charSequence, cap, limit, pos, mark, 0); |
| } |
| |
| /** |
| * Returns the character at the current position. |
| * |
| * @return the character at the current position |
| */ |
| public char get() |
| { |
| if (pos >= limit) |
| throw new BufferUnderflowException(); |
| |
| return charSequence.charAt(array_offset + pos++); |
| } |
| |
| /** |
| * Returns the character at the specified position. |
| * |
| * @return the character at the specified position |
| */ |
| public char get(int index) |
| { |
| if (index < 0 || index >= limit) |
| throw new IndexOutOfBoundsException(); |
| |
| return charSequence.charAt(array_offset + index); |
| } |
| |
| /** |
| * Cannot be direct, return <code>false</code> here. |
| * |
| * @return false |
| */ |
| public boolean isDirect() |
| { |
| return false; |
| } |
| |
| /** |
| * Returns the byte order of this buffer. This is always the native byte |
| * order. |
| * |
| * @return the byte order of this buffer |
| */ |
| public ByteOrder order() |
| { |
| return ByteOrder.nativeOrder(); |
| } |
| |
| /** |
| * This buffer class is not writable by definition and thus throws |
| * a ReadOnlyBufferException here. |
| */ |
| public CharBuffer put(char b) |
| { |
| throw new ReadOnlyBufferException(); |
| } |
| |
| /** |
| * This buffer class is not writable by definition and thus throws |
| * a ReadOnlyBufferException here. |
| */ |
| public CharBuffer put(int index, char b) |
| { |
| throw new ReadOnlyBufferException(); |
| } |
| |
| /** |
| * Returns a slice of this buffer, exposing the current position and limit. |
| */ |
| public CharBuffer slice() |
| { |
| int newCapacity = limit - pos; |
| return new CharSequenceBuffer(charSequence, newCapacity, newCapacity, 0, |
| -1, pos); |
| } |
| |
| /** |
| * Returns a sub sequence from the specified start index and with the |
| * specified length. |
| * |
| * @param start the start index |
| * @param length the length of the sub sequence |
| */ |
| public CharSequence subSequence(int start, int length) |
| { |
| int begin = array_offset + start + pos; |
| return charSequence.subSequence(begin, begin + length); |
| } |
| |
| /** |
| * This kind of CharBuffer is read-only, so we return <code>true</code> |
| * here. |
| */ |
| public boolean isReadOnly() |
| { |
| return true; |
| } |
| |
| } |