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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 org.apache.bcel.util;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
/**
* Utility class that implements a sequence of bytes which can be read
* via the `readByte()' method. This is used to implement a wrapper for the
* Java byte code stream to gain some more readability.
*
* @version $Id$
*/
public final class ByteSequence extends DataInputStream {
private final ByteArrayStream byteStream;
public ByteSequence(final byte[] bytes) {
super(new ByteArrayStream(bytes));
byteStream = (ByteArrayStream) in;
}
public final int getIndex() {
return byteStream.getPosition();
}
final void unreadByte() {
byteStream.unreadByte();
}
private static final class ByteArrayStream extends ByteArrayInputStream {
ByteArrayStream(final byte[] bytes) {
super(bytes);
}
final int getPosition() {
// pos is protected in ByteArrayInputStream
return pos;
}
final void unreadByte() {
if (pos > 0) {
pos--;
}
}
}
}
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