| /* |
| * 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; |
| } |
| } |