74 lines
1.8 KiB
Java
74 lines
1.8 KiB
Java
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/*
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* Copyright (C) 2007 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.io;
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import java.io.FilterOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import javax.annotation.Nullable;
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import com.google.common.annotations.Beta;
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/**
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* An OutputStream that counts the number of bytes written.
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*
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* @author Chris Nokleberg
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* @since 1.0
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*/
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@Beta
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public final class CountingOutputStream extends FilterOutputStream {
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private long count;
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/**
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* Wraps another output stream, counting the number of bytes written.
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*
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* @param out the output stream to be wrapped
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*/
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public CountingOutputStream(@Nullable OutputStream out) {
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super(out);
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}
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/** Returns the number of bytes written. */
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public long getCount() {
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return count;
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}
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@Override
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public void write(byte[] b, int off, int len) throws IOException {
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out.write(b, off, len);
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count += len;
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}
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@Override
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public void write(int b) throws IOException {
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out.write(b);
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count++;
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}
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// Overriding close() because FilterOutputStream's close() method pre-JDK8 has
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// bad behavior:
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// it silently ignores any exception thrown by flush(). Instead, just close the
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// delegate stream.
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// It should flush itself if necessary.
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@Override
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public void close() throws IOException {
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out.close();
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}
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}
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