org.archive.io.MiserOutputStream Maven / Gradle / Ivy
/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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.archive.io;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* A filter stream that both counts bytes written, and optionally swallows
* flush() requests.
*
* @contributor gojomo
*/
public class MiserOutputStream extends FilterOutputStream {
protected long count;
protected boolean passFlushes;
/**
* Wraps another output stream, counting the number of bytes written.
*
* @param out the output stream to be wrapped
*/
public MiserOutputStream(OutputStream out) {
this(out,true);
}
/**
* Wraps another output stream, counting the number of bytes written.
*
* @param out the output stream to be wrapped
*/
public MiserOutputStream(OutputStream out, boolean passFlushes) {
super(out);
this.passFlushes = passFlushes;
}
/** 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++;
}
@Override
public void close() throws IOException {
passFlushes = true;
super.close();
}
@Override
public void flush() throws IOException {
if(passFlushes) {
super.flush();
}
}
}