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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.nio;
import java.util.Arrays;
/**
* This class wraps a char sequence to be a char buffer.
* <p>
* Implementation notice:
* <ul>
* <li>Char sequence based buffer is always readonly.</li>
* </ul>
* </p>
*
*/
final class CharSequenceAdapter extends CharBuffer {
static CharSequenceAdapter copy(CharSequenceAdapter other) {
CharSequenceAdapter buf = new CharSequenceAdapter(other.sequence);
buf.limit = other.limit;
buf.position = other.position;
buf.mark = other.mark;
return buf;
}
final CharSequence sequence;
CharSequenceAdapter(CharSequence chseq) {
super(chseq.length());
sequence = chseq;
}
@Override
public CharBuffer asReadOnlyBuffer() {
return duplicate();
}
@Override
public CharBuffer compact() {
throw new ReadOnlyBufferException();
}
@Override
public CharBuffer duplicate() {
return copy(this);
}
@Override
public char get() {
if (position == limit) {
throw new BufferUnderflowException();
}
return sequence.charAt(position++);
}
@Override
public char get(int index) {
checkIndex(index);
return sequence.charAt(index);
}
@Override
public final CharBuffer get(char[] dst, int dstOffset, int charCount) {
Arrays.checkOffsetAndCount(dst.length, dstOffset, charCount);
if (charCount > remaining()) {
throw new BufferUnderflowException();
}
int newPosition = position + charCount;
sequence.toString().getChars(position, newPosition, dst, dstOffset);
position = newPosition;
return this;
}
@Override
public boolean isDirect() {
return false;
}
@Override
public boolean isReadOnly() {
return true;
}
@Override
public ByteOrder order() {
return ByteOrder.nativeOrder();
}
@Override char[] protectedArray() {
throw new UnsupportedOperationException();
}
@Override int protectedArrayOffset() {
throw new UnsupportedOperationException();
}
@Override boolean protectedHasArray() {
return false;
}
@Override
public CharBuffer put(char c) {
throw new ReadOnlyBufferException();
}
@Override
public CharBuffer put(int index, char c) {
throw new ReadOnlyBufferException();
}
@Override
public final CharBuffer put(char[] src, int srcOffset, int charCount) {
throw new ReadOnlyBufferException();
}
@Override
public CharBuffer put(String src, int start, int end) {
throw new ReadOnlyBufferException();
}
@Override
public CharBuffer slice() {
return new CharSequenceAdapter(sequence.subSequence(position, limit));
}
@Override
public CharSequence subSequence(int start, int end) {
checkStartEndRemaining(start, end);
CharSequenceAdapter result = copy(this);
result.position = position + start;
result.limit = position + end;
return result;
}
}
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