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Add CountingOutputStream

Reviewed By: mdvacca

Differential Revision: D6932872

fbshipit-source-id: 226f30833a786d0c03564f25ec8c4f43d94c48f4
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hramos authored and facebook-github-bot committed Feb 8, 2018
1 parent 2f02dd4 commit a5e135aed6941772c663adffd67729f7a5026d08
@@ -0,0 +1,70 @@
/*
* Copyright (C) 2007 The Guava Authors
*
* 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 com.facebook.react.modules.network;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
* An OutputStream that counts the number of bytes written.
*
* @author Chris Nokleberg
* @since 1.0
*/
public class CountingOutputStream extends FilterOutputStream {

private long mCount;

/**
* 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);
mCount = 0;
}

/**
* Returns the number of bytes written.
*/
public long getCount() {
return mCount;
}

@Override
public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
mCount += len;
}

@Override
public void write(int b) throws IOException {
out.write(b);
mCount++;
}

// Overriding close() because FilterOutputStream's close() method pre-JDK8 has bad behavior:
// it silently ignores any exception thrown by flush(). Instead, just close the delegate stream.
// It should flush itself if necessary.
@Override
public void close() throws IOException {
out.close();
}
}

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