/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.mina.filter.stream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.mina.common.IoBuffer;
import org.apache.mina.common.IoFilter;
import org.apache.mina.common.IoSession;
import org.apache.mina.common.WriteRequest;
/**
* Filter implementation which makes it possible to write {@link InputStream}
* objects directly using {@link IoSession#write(Object)}. When an
* {@link InputStream} is written to a session this filter will read the bytes
* from the stream into {@link IoBuffer} objects and write those buffers
* to the next filter. When end of stream has been reached this filter will
* call {@link IoFilter.NextFilter#messageSent(IoSession,WriteRequest)} using the original
* {@link InputStream} written to the session and notifies
* {@link org.apache.mina.common.WriteFuture} on the
* original {@link org.apache.mina.common.WriteRequest}.
* <p/>
* This filter will ignore written messages which aren't {@link InputStream}
* instances. Such messages will be passed to the next filter directly.
* </p>
* <p/>
* NOTE: this filter does not close the stream after all data from stream
* has been written. The {@link org.apache.mina.common.IoHandler} should take
* care of that in its
* {@link org.apache.mina.common.IoHandler#messageSent(IoSession,Object)}
* callback.
* </p>
*
* @author The Apache MINA Project (dev@mina.apache.org)
* @version $Rev: 632227 $, $Date: 2008-02-29 14:24:34 +0900 (금, 29 2월 2008) $
*/
public class StreamWriteFilter extends AbstractStreamWriteFilter<InputStream> {
@Override
protected IoBuffer getNextBuffer(InputStream is) throws IOException {
byte[] bytes = new byte[getWriteBufferSize()];
int off = 0;
int n = 0;
while (off < bytes.length
&& (n = is.read(bytes, off, bytes.length - off)) != -1) {
off += n;
}
if (n == -1 && off == 0) {
return null;
}
IoBuffer buffer = IoBuffer.wrap(bytes, 0, off);
return buffer;
}
@Override
protected Class<InputStream> getMessageClass() {
return InputStream.class;
}
}