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/*
* 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.tuscany.sca.binding.rest.xml;
import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.tuscany.sca.assembly.Base;
import org.apache.tuscany.sca.assembly.OperationSelector;
import org.apache.tuscany.sca.assembly.WireFormat;
import org.apache.tuscany.sca.binding.rest.RESTBinding;
import org.apache.tuscany.sca.binding.rest.RESTBindingFactory;
import org.apache.tuscany.sca.common.http.HTTPHeader;
import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.StAXAttributeProcessor;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
/**
* REST Binding Artifact Processor
*
* @version $Rev$ $Date$
*/
public class RESTBindingProcessor extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<RESTBinding> {
private static final QName HEADERS_QNAME = new QName(Base.SCA11_TUSCANY_NS, "http-headers");
private static final QName HEADER_QNAME = new QName(Base.SCA11_TUSCANY_NS, "header");
private static final QName RESPONSE_QNAME = new QName(Base.SCA11_TUSCANY_NS, "response");
private static final String NAME = "name";
private static final String VALUE = "value";
private static final String URI = "uri";
private RESTBindingFactory httpBindingFactory;
private StAXArtifactProcessor<Object> extensionProcessor;
public RESTBindingProcessor(ExtensionPointRegistry extensionPoints,
StAXArtifactProcessor<Object> extensionProcessor,
StAXAttributeProcessor<Object> extensionAttributeProcessor) {
FactoryExtensionPoint modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
this.httpBindingFactory = modelFactories.getFactory(RESTBindingFactory.class);
this.extensionProcessor = (StAXArtifactProcessor<Object>)extensionProcessor;
}
public QName getArtifactType() {
return RESTBinding.TYPE;
}
public Class<RESTBinding> getModelType() {
return RESTBinding.class;
}
public RESTBinding read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException, XMLStreamException {
RESTBinding restBinding = httpBindingFactory.createRESTBinding();
/**
* <tuscany:binding.rest uri="http://localhost:8085/Customer">
* <tuscany:wireFormat.xml />
* <tuscany:operationSelector.jaxrs />
* <tuscany:http-headers>
* <tuscany:header name="Cache-Control" value="no-cache"/>
* <tuscany:header name="Expires" value="-1"/>
* </tuscany:http-headers>
* <tuscany:response>
* <tuscany:wireFormat.json />
* </tuscany:response>
* </tuscany:binding.rest>
*
*/
while(reader.hasNext()) {
QName elementName = null;
int event = reader.getEventType();
switch (event) {
case START_ELEMENT:
elementName = reader.getName();
if(RESTBinding.TYPE.equals(elementName)) {
// binding attributes
String name = getString(reader, NAME);
if(name != null) {
restBinding.setName(name);
}
String uri = getURIString(reader, URI);
if (uri != null) {
restBinding.setURI(uri);
}
break;
} else if (HEADERS_QNAME.equals(elementName)) {
// ignore wrapper element
break;
} else if (HEADER_QNAME.equals(elementName)) {
// header name/value pair
String name = getString(reader, NAME);
String value = getURIString(reader, VALUE);
if(name != null) {
restBinding.getHttpHeaders().add(new HTTPHeader(name, value));
}
break;
} else if (RESPONSE_QNAME.equals(elementName)) {
// skip response
reader.next();
// and position to the next start_element event
while (reader.hasNext()) {
int sub_event = reader.getEventType();
switch (sub_event) {
case START_ELEMENT:
elementName = reader.getName();
break;
default: reader.next();
}
break;
}
// dispatch to read wire format for the response
Object extension = extensionProcessor.read(reader, context);
if (extension != null) {
if (extension instanceof WireFormat) {
restBinding.setResponseWireFormat((WireFormat)extension);
}
}
break;
} else {
// Read an extension element
Object extension = extensionProcessor.read(reader, context);
if (extension != null) {
if (extension instanceof WireFormat) {
restBinding.setRequestWireFormat((WireFormat)extension);
restBinding.setResponseWireFormat((WireFormat)extension);
} else if(extension instanceof OperationSelector) {
restBinding.setOperationSelector((OperationSelector)extension);
}
}
break;
}
case END_ELEMENT:
elementName = reader.getName();
if(RESTBinding.TYPE.equals(elementName)) {
return restBinding;
}
break;
}
// Read the next element
if (reader.hasNext()) {
reader.next();
}
}
return restBinding;
}
public void write(RESTBinding restBinding, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
writeStart(writer, RESTBinding.TYPE.getNamespaceURI(), RESTBinding.TYPE.getLocalPart());
// Write binding name
if (restBinding.getName() != null) {
writer.writeAttribute(NAME, restBinding.getName());
}
// Write binding URI
if (restBinding.getURI() != null) {
writer.writeAttribute(URI, restBinding.getURI());
}
// Write operation selectors
if ( restBinding.getOperationSelector() != null ) {
extensionProcessor.write(restBinding.getOperationSelector(), writer, context);
}
// Write wire formats
if ( restBinding.getRequestWireFormat() != null ) {
extensionProcessor.write(restBinding.getRequestWireFormat(), writer, context);
}
if ( restBinding.getResponseWireFormat() != null && restBinding.getRequestWireFormat() != restBinding.getResponseWireFormat()) {
writeStart(writer, RESPONSE_QNAME.getNamespaceURI(), RESPONSE_QNAME.getLocalPart());
extensionProcessor.write(restBinding.getResponseWireFormat(), writer, context);
writeEnd(writer);
}
writeEnd(writer);
}
public void resolve(RESTBinding model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
// Should not need to do anything here for now...
}
}
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