| /* |
| * 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.harmony.luni.util; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * This class implements a Stream whose position can be queried for. |
| */ |
| public class PositionedInputStream extends FilterInputStream { |
| |
| private int currentPosition; // Current position on the underlying stream |
| |
| /** |
| * Constructs a new instance of the receiver. |
| * |
| * @param in The actual input stream where to read the bytes from. |
| */ |
| public PositionedInputStream(InputStream in) { |
| super(in); |
| } |
| |
| /** |
| * Return the current position in the receiver |
| * |
| * @return int The current position in the receiver |
| */ |
| public int currentPosition() { |
| return currentPosition; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int read = in.read(); |
| if (read >= 0) { |
| currentPosition++; |
| } |
| return read; |
| |
| } |
| |
| @Override |
| public int read(byte b[], int off, int len) throws IOException { |
| int read = in.read(b, off, len); |
| if (read >= 0) { |
| currentPosition += read; |
| } |
| return read; |
| } |
| |
| /** |
| * Makes the current position on the underlying stream be assigned relative |
| * position zero. |
| */ |
| public void resetCurrentPosition() { |
| currentPosition = 0; |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| long skip = in.skip(n); |
| currentPosition += skip; // Maybe currentPosition should be long ? |
| return skip; |
| } |
| } |