/*
* 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.axis2.mex;
import java.util.ArrayList;
import java.util.List;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.soap.SOAPBody;
import org.apache.axiom.soap.SOAPEnvelope;
import org.apache.axiom.soap.SOAPFactory;
import org.apache.axis2.AxisFault;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.dataretrieval.Data;
import org.apache.axis2.dataretrieval.DataRetrievalException;
import org.apache.axis2.dataretrieval.DataRetrievalRequest;
import org.apache.axis2.dataretrieval.OutputForm;
import org.apache.axis2.description.AxisService;
import org.apache.axis2.description.Parameter;
import org.apache.axis2.mex.om.Location;
import org.apache.axis2.mex.om.Metadata;
import org.apache.axis2.mex.om.MetadataReference;
import org.apache.axis2.mex.om.MetadataSection;
import org.apache.axis2.mex.om.MexOMException;
import org.apache.axis2.mex.util.MexUtil;
import org.apache.axis2.receivers.AbstractInOutMessageReceiver;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.xml.namespace.QName;
/**
* Message Receiver for processing WS-MEX GetMetadata request.
*
*/
public class MexMessageReceiver extends AbstractInOutMessageReceiver {
private static final Log log = LogFactory.getLog(MexMessageReceiver.class);
Parameter axisConfigMEXParm = null;
Parameter serviceConfigMEXParm = null;
String mexNamespaceValue = null;
/**
* Process GetMetadata request
*/
public void invokeBusinessLogic(MessageContext msgContext,
MessageContext newmsgContext) throws AxisFault {
AxisService theService = msgContext.getAxisService();
axisConfigMEXParm = msgContext.getConfigurationContext().getAxisConfiguration().getParameter(MexConstants.MEX_CONFIG.MEX_PARM);
serviceConfigMEXParm = theService.getParameter(MexConstants.MEX_CONFIG.MEX_PARM);
check_MEX_disabled(serviceConfigMEXParm);
try {
Metadata metadata = handleRequest(msgContext);
theService.setEndpointURL(msgContext.getTo().getAddress());
if (metadata != null) {
SOAPEnvelope envelope = newmsgContext.getEnvelope();
if (envelope == null) {
SOAPFactory fac = getSOAPFactory(msgContext);
envelope = fac.getDefaultEnvelope();
}
OMElement result = metadata.toOM();
if (result != null) {
AxisService service = msgContext.getAxisService();
result.declareNamespace(service.getTargetNamespace(),
service.getTargetNamespacePrefix());
envelope.getBody().addChild(result);
}
newmsgContext.setEnvelope(envelope);
}
// AxisService service = msgContext.getAxisService();
} catch (Exception e) {
log.info(e);
if (e instanceof MexException) {
throw (MexException) e;
}
throw new MexException(e);
}
}
/*
* Handle GetMetadata Request
* Interprete GetMetadata request and process request.
* @returns Metadata object
*/
private Metadata handleRequest(MessageContext msgContext) throws AxisFault {
Metadata metadata = null;
SOAPEnvelope envelope = msgContext.getEnvelope();
SOAPBody body = envelope.getBody();
OMElement aReq = body.getFirstChildWithName(new QName(
MexConstants.Spec_2004_09.NS_URI,
MexConstants.SPEC.GET_METADATA));
List metadata_request_list;
if (aReq != null) {
mexNamespaceValue = MexConstants.Spec_2004_09.NS_URI;
metadata_request_list = determineMetadataTypes(aReq);
} else {
throw new MexException("Invalid Metadata request");
}
metadata = processRequest(metadata_request_list, msgContext, aReq);
return metadata;
}
/*
* Process the requests
*
* @param metadata_request_list list of mex Dialect for requesting data
* @msgContext MessageContext
* @aReq GetMetadata request
*/
public Metadata processRequest(List metadata_request_list,
MessageContext msgContext, OMElement aReq) throws MexException {
// Instantiate Metadata instance to build the WS-Mex Metadata element
SOAPEnvelope envelope = msgContext.getEnvelope();
String soapNamespaceURI = envelope.getNamespace().getNamespaceURI();
SOAPFactory factory = MexUtil.getSOAPFactory(soapNamespaceURI);
Metadata metadata = new Metadata(factory, mexNamespaceValue);
DataRetrievalRequest requestOptions = new DataRetrievalRequest();
String identifier_value = null;
// Check if Identifier element included in request
OMElement dialectElem = aReq.getFirstChildWithName(new QName(
mexNamespaceValue, MexConstants.SPEC.DIALECT));
if (dialectElem != null) {
OMElement identifier = dialectElem.getFirstChildWithName(new QName(
mexNamespaceValue, MexConstants.SPEC.IDENTIFIER));
if (identifier != null) {
identifier_value = identifier.getText();
if (identifier_value != null && identifier_value.length() > 0) {
requestOptions.putIdentifier(identifier_value);
}
}
}
// Process the request and append MetadataSection to Metadata
// Loop through the metadata_request_list for Dialect(s)), and setup requestOptions.
// Basically, one requestOptions is setup for each supported outputForm for the Dialect
// and Identifier specified in the GetMetadata request.
int len = metadata_request_list.size();
OutputForm[] outputforms;
for (int i = 0; i < len; i++) { // metadata request
String dialect = "";
try {
dialect = (String) metadata_request_list.get(i);
requestOptions.putDialect(dialect);
outputforms = MexUtil.determineOutputForm(dialect, axisConfigMEXParm, serviceConfigMEXParm);
// Loop to call AxisService::getData API to retrieve data
// for the Dialect and Identifier(if specified) in the request
// for each
// supported output form.
for (int j = 0; j < outputforms.length; j++) { // output form
requestOptions.putOutputForm(outputforms[j]);
Data[] result = msgContext.getAxisService().getData(requestOptions,
msgContext);
ArrayList sections = processData(result, outputforms[j], dialect,
identifier_value, factory);
metadata.addMetadatSections(sections);
}
} catch (DataRetrievalException e) {
log.error("Data Retrieval exception detected for dialect, " + dialect, e);
throw new MexException(e);
} catch (Throwable e) {
log.error("Throwable detected for dialect, " + dialect , e);
e.printStackTrace();
throw new MexException(e);
}
}
return metadata;
}
/*
* Create MetadataSection for each Data element, and add the
* MetadataSections to Metadata.
*/
private ArrayList processData(Data[] data, OutputForm outputForm,
String dialect, String identifier_value, SOAPFactory factory) throws MexException {
MetadataSection section=null;
ArrayList sections = new ArrayList();
if (data == null || data.length == 0) {
if (log.isDebugEnabled())
log
.debug("No result was returned from getData request for dialect,"
+ dialect
+ " Form: "
+ outputForm.getType()
+ ". No MetadataSection will be added!");
} else {
for (int k = 0; k < data.length; k++) {
section = createMetadataSection(outputForm, data[k].getData(),
factory, mexNamespaceValue);
section.setDialect(dialect);
identifier_value = data[k].getIdentifier();
if (identifier_value != null) {
section.setIdentifier(identifier_value);
}
sections.add(section);
}
}
return sections;
}
private MetadataSection createMetadataSection(OutputForm outputForm,
Object result, SOAPFactory factory, String mexNamespaceValue)
throws MexOMException {
MetadataSection section = new MetadataSection(factory,
mexNamespaceValue);
if (outputForm == OutputForm.INLINE_FORM)
section.setinlineData(result);
else if (outputForm == OutputForm.LOCATION_FORM)
section.setLocation(new Location(factory, mexNamespaceValue,
(String) result));
else if (outputForm == OutputForm.REFERENCE_FORM) {
MetadataReference ref = new MetadataReference(factory,
mexNamespaceValue);
ref.setEPR((OMElement) result);
section.setMetadataReference(ref);
} else {
section.setinlineData((OMElement) result);
}
return section;
}
/*
* Traverse and interprete the GetMetadata OMElement for Dialect element
* that specified in the request. @returns a List with Dialect(s) of
* metadata requested.
*
*/
private List determineMetadataTypes(OMElement aReq) {
List metadata_request_list = new ArrayList();
boolean allTypes = false;
OMElement dialect = aReq.getFirstChildWithName(new QName(mexNamespaceValue,
MexConstants.SPEC.DIALECT));
if (dialect != null) {
String dialectText = dialect.getText();
if (dialectText != null && dialectText.length() > 0) {
metadata_request_list.add(dialectText.trim());
} else {
allTypes = true;
}
} else {
allTypes = true;
}
if (allTypes) { // retrieve all metadata
metadata_request_list.add(MexConstants.SPEC.DIALECT_TYPE_POLICY);
metadata_request_list.add(MexConstants.SPEC.DIALECT_TYPE_SCHEMA);
metadata_request_list.add(MexConstants.SPEC.DIALECT_TYPE_WSDL);
}
return metadata_request_list;
}
private void check_MEX_disabled (Parameter mexConfig) throws MexDisabledException{
if (MexUtil.isMexDisabled(mexConfig)){
throw new MexDisabledException("'metadataexchange' parameter configured to disable MEX for the service.");
}
}
}