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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 com.jtransc.JTranscArrays;

import java.util.Arrays;

/**
 * This class wraps a char sequence to be a char buffer.
 * 

* Implementation notice: *

    *
  • Char sequence based buffer is always readonly.
  • *
*

* */ 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) { JTranscArrays.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 CharBuffer 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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