| /* |
| * 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.google.common.io; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import com.google.common.annotations.Beta; |
| import com.google.common.annotations.GwtIncompatible; |
| 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 |
| */ |
| @Beta |
| @GwtIncompatible |
| public final class CountingOutputStream extends FilterOutputStream { |
| |
| private long count; |
| |
| /** |
| * Wraps another output stream, counting the number of bytes written. |
| * |
| * @param out the output stream to be wrapped |
| */ |
| public CountingOutputStream(OutputStream out) { |
| super(checkNotNull(out)); |
| } |
| |
| /** Returns the number of bytes written. */ |
| public long getCount() { |
| return count; |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| out.write(b, off, len); |
| count += len; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| out.write(b); |
| count++; |
| } |
| |
| // 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(); |
| } |
| } |