/*
* Copyright 2005,2006 WSO2, Inc. http://www.wso2.org
*
* 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 org.wso2.carbon.relay;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.activation.DataSource;
import org.apache.axiom.attachments.ByteArrayDataSource;
/**
* This class has a special flag, which says this is it's last use and not to cache data
* if it did not have done so already.
*
* @author Srinath Perera (srinath@wso2.com)
*/
public class StreamingOnRequestDataSource implements DataSource {
private InputStream in;
public StreamingOnRequestDataSource(InputStream in) {
super();
this.in = in;
}
private boolean lastUse = false;
private ByteArrayDataSource cachedData = null;
public String getContentType() {
return "application/octet-stream";
}
public InputStream getInputStream() throws IOException {
if (cachedData != null) {
return cachedData.getInputStream();
} else {
if (lastUse && in != null) {
InputStream returnStram = in;
this.in = null;
return returnStram;
} else if (in != null) {
byte[] data = BinaryRelayBuilder.readAllFromInputSteam(in);
cachedData = new ByteArrayDataSource(data);
return cachedData.getInputStream();
} else {
throw new IOException("Input stream has being already consumed");
}
}
}
public String getName() {
return "StreamingOnRequestDataSource";
}
public OutputStream getOutputStream() throws IOException {
throw new UnsupportedOperationException();
}
/**
* This flag says that this is the last use of the stream, hence do not
* need to cache it if it has not
* already cached.
*
* @param lastUse
*/
public void setLastUse(boolean lastUse) {
this.lastUse = lastUse;
}
}