/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed 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 libcore.util;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* An output stream that keeps count of the number of bytes written to it.
*
* Useful when we need to make decisions based on the size of the output, such
* as deciding what sort of metadata to writes to zip files.
*/
public class CountingOutputStream extends FilterOutputStream {
private long count;
/**
* Constructs a new {@code FilterOutputStream} with {@code out} as its
* target stream.
*
* @param out the target stream that this stream writes to.
*/
public CountingOutputStream(OutputStream out) {
super(out);
count = 0;
}
@Override
public void write(byte[] buffer, int offset, int length) throws IOException {
out.write(buffer, offset, length);
count += length;
}
@Override
public void write(int oneByte) throws IOException {
out.write(oneByte);
count++;
}
public long getCount() {
return count;
}
}