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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.assembly.xml;
import static org.apache.tuscany.sca.assembly.xml.Constants.POLICY_SETS;
import static org.apache.tuscany.sca.assembly.xml.Constants.REQUIRES;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
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.contribution.processor.BaseStAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.policy.Intent;
import org.apache.tuscany.sca.policy.PolicyFactory;
import org.apache.tuscany.sca.policy.PolicySet;
import org.apache.tuscany.sca.policy.PolicySubject;
/**
* A Policy Attach Point processor.
*
* @version $Rev$ $Date$
* @tuscany.spi.extension.asclient
*/
public class PolicySubjectProcessor extends BaseStAXArtifactProcessor {
private PolicyFactory policyFactory;
public PolicySubjectProcessor(PolicyFactory policyFactory) {
this.policyFactory = policyFactory;
}
public PolicySubjectProcessor(ExtensionPointRegistry registry) {
FactoryExtensionPoint factories = registry.getExtensionPoint(FactoryExtensionPoint.class);
this.policyFactory = factories.getFactory(PolicyFactory.class);
}
/**
* Read policy intents associated with an operation.
* @param subject
* @param operation
* @param reader
*/
private void readIntents(Object subject, Operation operation, XMLStreamReader reader) {
if (!(subject instanceof PolicySubject))
return;
PolicySubject intentAttachPoint = (PolicySubject)subject;
String value = reader.getAttributeValue(null, REQUIRES);
if (value != null) {
List<Intent> requiredIntents = intentAttachPoint.getRequiredIntents();
for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) {
QName qname = getQNameValue(reader, tokens.nextToken());
Intent intent = policyFactory.createIntent();
intent.setName(qname);
if (operation != null) {
//FIXME Don't we need to handle intent specification
// on an operation basis?
//intent.getOperations().add(operation);
}
requiredIntents.add(intent);
}
}
}
/**
* Reads policy intents and policy sets associated with an operation.
* @param subject
* @param operation
* @param reader
*/
public void readPolicies(Object subject, Operation operation, XMLStreamReader reader) {
readIntents(subject, operation, reader);
readPolicySets(subject, operation, reader);
}
/**
* Reads policy intents and policy sets.
* @param subject
* @param reader
*/
public void readPolicies(Object subject, XMLStreamReader reader) {
readPolicies(subject, null, reader);
}
/**
* Reads policy sets associated with an operation.
* @param subject
* @param operation
* @param reader
*/
private void readPolicySets(Object subject, Operation operation, XMLStreamReader reader) {
if (!(subject instanceof PolicySubject)) {
return;
}
PolicySubject policySubject = (PolicySubject)subject;
String value = reader.getAttributeValue(null, POLICY_SETS);
if (value != null) {
List<PolicySet> policySets = policySubject.getPolicySets();
for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) {
QName qname = getQNameValue(reader, tokens.nextToken());
PolicySet policySet = policyFactory.createPolicySet();
policySet.setName(qname);
if (operation != null) {
//FIXME Don't we need to handle policySet specification
// on an operation basis?
//policySet.getOperations().add(operation);
}
policySets.add(policySet);
}
}
}
/**
* Write policies
* @param subject
* @return
*/
XAttr writePolicies(Object subject) throws XMLStreamException {
return writePolicies(subject, (Operation)null);
}
/**
* Write policies
* @param subject
* @return
*/
public void writePolicyAttributes(Object subject, XMLStreamWriter writer) throws XMLStreamException {
writePolicyAttributes(subject, (Operation)null, writer);
}
/**
* Write policies associated with an operation
* @param subject
* @param operation
* @return
*/
XAttr writePolicies(Object subject, Operation operation) {
List<XAttr> attrs =new ArrayList<XAttr>();
attrs.add(writeIntents(subject, operation));
attrs.add(writePolicySets(subject, operation));
return new XAttr(null, attrs);
}
/**
* Write policies
* @param subject
* @return
*/
public void writePolicyAttributes(Object subject, Operation operation, XMLStreamWriter writer) throws XMLStreamException {
XAttr attr = writePolicies(subject, operation);
attr.write(writer);
}
/**
* Write policy intents associated with an operation.
* @param subject
* @param operation
*/
private XAttr writeIntents(Object subject, Operation operation) {
if (!(subject instanceof PolicySubject)) {
return null;
}
PolicySubject intentAttachPoint = (PolicySubject)subject;
List<QName> qnames = new ArrayList<QName>();
for (Intent intent: intentAttachPoint.getRequiredIntents()) {
qnames.add(intent.getName());
}
return new XAttr(Constants.REQUIRES, qnames);
}
/**
* Write policy sets associated with an operation.
* @param subject
* @param operation
*/
private XAttr writePolicySets(Object subject, Operation operation) {
if (!(subject instanceof PolicySubject)) {
return null;
}
PolicySubject policySetAttachPoint = (PolicySubject)subject;
List<QName> qnames = new ArrayList<QName>();
for (PolicySet policySet: policySetAttachPoint.getPolicySets()) {
qnames.add(policySet.getName());
}
return new XAttr(Constants.POLICY_SETS, qnames);
}
public void resolvePolicies(Object subject, ModelResolver resolver, ProcessorContext context) {
if ( subject instanceof PolicySubject ) {
PolicySubject policySetAttachPoint = (PolicySubject)subject;
List<Intent> requiredIntents = new ArrayList<Intent>();
Intent resolvedIntent = null;
if ( policySetAttachPoint.getRequiredIntents() != null && policySetAttachPoint.getRequiredIntents().size() > 0 ) {
for ( Intent intent : policySetAttachPoint.getRequiredIntents() ) {
resolvedIntent = resolver.resolveModel(Intent.class, intent, context);
requiredIntents.add(resolvedIntent);
}
policySetAttachPoint.getRequiredIntents().clear();
policySetAttachPoint.getRequiredIntents().addAll(requiredIntents);
}
if ( policySetAttachPoint.getPolicySets() != null && policySetAttachPoint.getPolicySets().size() > 0 ) {
List<PolicySet> resolvedPolicySets = new ArrayList<PolicySet>();
PolicySet resolvedPolicySet = null;
for ( PolicySet policySet : policySetAttachPoint.getPolicySets() ) {
resolvedPolicySet = resolver.resolveModel(PolicySet.class, policySet, context);
resolvedPolicySets.add(resolvedPolicySet);
}
policySetAttachPoint.getPolicySets().clear();
policySetAttachPoint.getPolicySets().addAll(resolvedPolicySets);
}
}
}
}
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