/*
* 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.synapse.util.jaxp;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.axiom.om.util.StAXUtils;
import org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder;
import org.apache.axiom.util.blob.OverflowBlob;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.SynapseException;
import org.apache.synapse.core.SynapseEnvironment;
import org.apache.synapse.util.TextFileDataSource;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.Result;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
/**
* {@link ResultBuilder} implementation that produces a {@link StreamResult} backed by a
* {@link org.apache.axiom.util.blob.OverflowBlob} object.
*/
public class StreamResultBuilder implements ResultBuilder {
private static final Log log = LogFactory.getLog(StreamResultBuilder.class);
private final SynapseEnvironment synEnv;
private final ResultBuilderFactory.Output expectedOutput;
private OverflowBlob tmp;
private OutputStream out;
public StreamResultBuilder(SynapseEnvironment synEnv,
ResultBuilderFactory.Output expectedOutput) {
this.synEnv = synEnv;
this.expectedOutput = expectedOutput;
}
public Result getResult() {
tmp = synEnv.createOverflowBlob();
out = tmp.getOutputStream();
return new StreamResult(out);
}
public OMElement getNode(Charset charset) {
try {
out.close();
} catch (IOException e) {
handleException("Error while closing output stream", e);
}
if (expectedOutput == ResultBuilderFactory.Output.TEXT) {
return TextFileDataSource.createOMSourcedElement(tmp, charset);
} else {
XMLStreamReader reader;
try {
reader = StAXUtils.createXMLStreamReader(tmp.getInputStream());
} catch (XMLStreamException e) {
handleException("Unable to parse the XML output", e);
return null;
} catch (IOException e) {
handleException("I/O error while reading temporary file", e);
return null;
}
if (expectedOutput == ResultBuilderFactory.Output.SOAP_ENVELOPE) {
return new StAXSOAPModelBuilder(reader).getSOAPEnvelope();
} else {
return new StAXOMBuilder(reader).getDocumentElement();
}
}
}
public void release() {
if (tmp != null) {
tmp.release();
tmp = null;
}
}
private static void handleException(String message, Throwable ex) {
log.error(message, ex);
throw new SynapseException(message, ex);
}
}