diff options
Diffstat (limited to 'sca-java-1.x/tags/1.6.1-TUSCANY-3909/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java')
| -rw-r--r-- | sca-java-1.x/tags/1.6.1-TUSCANY-3909/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java | 417 |
1 files changed, 417 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.6.1-TUSCANY-3909/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java b/sca-java-1.x/tags/1.6.1-TUSCANY-3909/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java new file mode 100644 index 0000000000..3d14a141e6 --- /dev/null +++ b/sca-java-1.x/tags/1.6.1-TUSCANY-3909/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java @@ -0,0 +1,417 @@ +/* + * 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.policy.xml; + +import static javax.xml.stream.XMLStreamConstants.END_ELEMENT; +import static javax.xml.stream.XMLStreamConstants.START_ELEMENT; + +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.ModelFactoryExtensionPoint; +import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor; +import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; +import org.apache.tuscany.sca.contribution.service.ContributionReadException; +import org.apache.tuscany.sca.contribution.service.ContributionResolveException; +import org.apache.tuscany.sca.contribution.service.ContributionWriteException; +import org.apache.tuscany.sca.monitor.Monitor; +import org.apache.tuscany.sca.monitor.Problem; +import org.apache.tuscany.sca.monitor.Problem.Severity; +import org.apache.tuscany.sca.monitor.impl.ProblemImpl; +import org.apache.tuscany.sca.policy.Intent; +import org.apache.tuscany.sca.policy.PolicyFactory; +import org.apache.tuscany.sca.policy.ProfileIntent; +import org.apache.tuscany.sca.policy.QualifiedIntent; + +/** + * Processor for handling XML models of PolicyIntent definitions + * + * @version $Rev$ $Date$ + */ +abstract class PolicyIntentProcessor<T extends Intent> extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<T>, PolicyConstants { + + private PolicyFactory policyFactory; + private Monitor monitor; + + public PolicyIntentProcessor(ModelFactoryExtensionPoint modelFactories, Monitor monitor) { + this.policyFactory = modelFactories.getFactory(PolicyFactory.class); + this.monitor = monitor; + } + + public PolicyIntentProcessor(PolicyFactory policyFactory, Monitor monitor) { + this.policyFactory = policyFactory; + this.monitor = monitor; + } + + /** + * Report a error. + * + * @param problems + * @param message + * @param model + */ + private void error(String message, Object model, Object... messageParameters) { + if (monitor != null) { + Problem problem = new ProblemImpl(this.getClass().getName(), "policy-xml-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters); + monitor.problem(problem); + } + } + + public T read(XMLStreamReader reader) throws ContributionReadException, XMLStreamException { + Intent policyIntent = null; + String policyIntentName = reader.getAttributeValue(null, NAME); + if (policyIntentName == null) { + error("IntentNameMissing", reader); + return (T)policyIntent; + } + + // Read an <sca:intent> + if (reader.getAttributeValue(null, REQUIRES) != null) { + policyIntent = policyFactory.createProfileIntent(); + } else if ( policyIntentName != null && policyIntentName.indexOf(QUALIFIER) != -1) { + policyIntent = policyFactory.createQualifiedIntent(); + + int qualifierIndex = policyIntentName.lastIndexOf(QUALIFIER); + Intent qualifiableIntent = policyFactory.createIntent(); + qualifiableIntent.setUnresolved(true); + qualifiableIntent.setName(new QName(policyIntentName.substring(0, qualifierIndex))); + + ((QualifiedIntent)policyIntent).setQualifiableIntent(qualifiableIntent); + } else { + policyIntent = policyFactory.createIntent(); + } + policyIntent.setName(new QName(policyIntentName)); + + if ( policyIntent instanceof ProfileIntent ) { + readRequiredIntents((ProfileIntent)policyIntent, reader); + } + else { + readExcludedIntents(policyIntent, reader); + } + + readConstrainedArtifacts(policyIntent, reader); + + int event = reader.getEventType(); + QName name = null; + while (reader.hasNext()) { + event = reader.getEventType(); + switch (event) { + case START_ELEMENT : { + name = reader.getName(); + if (DESCRIPTION_QNAME.equals(name)) { + policyIntent.setDescription(reader.getElementText()); + } + break; + } + } + if (event == END_ELEMENT && POLICY_INTENT_QNAME.equals(reader.getName())) { + break; + } + + //Read the next element + if (reader.hasNext()) { + reader.next(); + } + } + return (T)policyIntent; + } + + public void write(T policyIntent, XMLStreamWriter writer) throws ContributionWriteException, XMLStreamException { + // Write an <sca:intent> + writer.writeStartElement(PolicyConstants.SCA10_NS, INTENT); + writer.writeNamespace(policyIntent.getName().getPrefix(), policyIntent.getName().getNamespaceURI()); + writer.writeAttribute(PolicyConstants.NAME, + policyIntent.getName().getPrefix() + COLON + policyIntent.getName().getLocalPart()); + if (policyIntent instanceof ProfileIntent) { + ProfileIntent profileIntent = (ProfileIntent)policyIntent; + if (profileIntent.getRequiredIntents() != null && + profileIntent.getRequiredIntents().size() > 0) { + StringBuffer sb = new StringBuffer(); + for (Intent requiredIntents : profileIntent.getRequiredIntents()) { + sb.append(requiredIntents.getName()); + sb.append(" "); + } + writer.writeAttribute(PolicyConstants.REQUIRES, sb.toString()); + } + } + else { + if (policyIntent.getExcludedIntents() != null && + policyIntent.getExcludedIntents().size() > 0) { + StringBuffer sb = new StringBuffer(); + for (Intent excludedIntents : policyIntent.getExcludedIntents()) { + sb.append(excludedIntents.getName()); + sb.append(" "); + } + writer.writeAttribute(PolicyConstants.EXCLUDES, sb.toString()); + } + } + + if (!(policyIntent instanceof QualifiedIntent) ) { + if (policyIntent.getConstrains() != null && + policyIntent.getConstrains().size() > 0) { + StringBuffer sb = new StringBuffer(); + for (QName contrainedArtifact : policyIntent.getConstrains()) { + sb.append(contrainedArtifact.toString()); + sb.append(" "); + } + writer.writeAttribute(CONSTRAINS, sb.toString()); + } else { + error("ContrainsAttributeMissing", policyIntent, policyIntent.getName()); + //throw new ContributionWriteException("Contrains attribute missing from " + + //"Policy Intent Definition" + policyIntent.getName()); + } + } + + if ( policyIntent.getDescription() != null && policyIntent.getDescription().length() > 0) { + writer.writeStartElement(PolicyConstants.SCA10_NS, DESCRIPTION); + writer.writeCData(policyIntent.getDescription()); + writer.writeEndElement(); + } + + writer.writeEndElement(); + } + + //FIXME This method is never used +// private Intent resolveRequiredIntents(ProfileIntent policyIntent, ModelResolver resolver) throws ContributionResolveException { +// boolean isUnresolved = false; +// //FIXME: Need to check for cyclic references first i.e an A requiring B and then B requiring A... +// if (policyIntent != null && policyIntent.isUnresolved()) { +// +// //resolve all required intents +// List<Intent> requiredIntents = new ArrayList<Intent>(); +// for (Intent requiredIntent : policyIntent.getRequiredIntents()) { +// if ( requiredIntent.isUnresolved() ) { +// //policyIntent.getRequiredIntents().remove(requiredIntent); +// requiredIntent = resolver.resolveModel(Intent.class, requiredIntent); +// requiredIntents.add(requiredIntent); +// if (requiredIntent.isUnresolved()) { +// isUnresolved = true; +// } +// } +// } +// policyIntent.getRequiredIntents().clear(); +// policyIntent.getRequiredIntents().addAll(requiredIntents); +// } +// policyIntent.setUnresolved(isUnresolved); +// +// return policyIntent; +// } + + //FIXME This method is never used +// private Intent resolveQualifiableIntent(QualifiedIntent policyIntent, ModelResolver resolver) throws ContributionResolveException { +// boolean isUnresolved = false; +// +// if (policyIntent != null && policyIntent.isUnresolved()) { +// //resolve the qualifiable intent +// Intent qualifiableIntent = +// resolver.resolveModel(Intent.class, policyIntent.getQualifiableIntent()); +// policyIntent.setQualifiableIntent(qualifiableIntent); +// isUnresolved = qualifiableIntent.isUnresolved(); +// } +// policyIntent.setUnresolved(isUnresolved); +// +// return policyIntent; +// } + + private void resolveContrainedArtifacts(Intent policyIntent, ModelResolver resolver) { + //FIXME : need to figure out this resolution. + policyIntent.setUnresolved(false); + } + + private void resolveProfileIntent(ProfileIntent policyIntent, ModelResolver resolver) + throws ContributionResolveException { + // FIXME: Need to check for cyclic references first i.e an A requiring B + // and then B requiring A... + if (policyIntent != null) { + // resolve all required intents + List<Intent> requiredIntents = new ArrayList<Intent>(); + for (Intent requiredIntent : policyIntent.getRequiredIntents()) { + if (requiredIntent.isUnresolved()) { + Intent resolvedRequiredIntent = resolver.resolveModel(Intent.class, requiredIntent); + // At this point, when the required intent is not resolved, it does not mean + // its undeclared, chances are that their dependency are not resolved yet. + // Lets try to resolve them first. + if (resolvedRequiredIntent.isUnresolved()) { + if (resolvedRequiredIntent instanceof ProfileIntent) { + if ((((ProfileIntent)resolvedRequiredIntent).getRequiredIntents()).contains(policyIntent)) { + error("CyclicReferenceFound", resolver, requiredIntent, policyIntent); + return; + } + resolveDependent(resolvedRequiredIntent, resolver); + } + } + + if (!resolvedRequiredIntent.isUnresolved()) { + requiredIntents.add(resolvedRequiredIntent); + } else { + error("RequiredIntentNotFound", resolver, requiredIntent, policyIntent); + return; + //throw new ContributionResolveException("Required Intent - " + requiredIntent + //+ " not found for ProfileIntent " + policyIntent); + } + } else { + requiredIntents.add(requiredIntent); + } + } + policyIntent.getRequiredIntents().clear(); + policyIntent.getRequiredIntents().addAll(requiredIntents); + } + } + + private void resolveQualifiedIntent(QualifiedIntent policyIntent, ModelResolver resolver) + throws ContributionResolveException { + if (policyIntent != null) { + //resolve the qualifiable intent + Intent qualifiableIntent = policyIntent.getQualifiableIntent(); + if (qualifiableIntent.isUnresolved()) { + Intent resolvedQualifiableIntent = resolver.resolveModel(Intent.class, qualifiableIntent); + // At this point, when the qualifiable intent is not resolved, it does not mean + // its undeclared, chances are that their dependency are not resolved yet. + // Lets try to resolve them first. + if (resolvedQualifiableIntent.isUnresolved()) { + if (resolvedQualifiableIntent instanceof QualifiedIntent) { + resolveDependent(resolvedQualifiableIntent, resolver); + } + } + + if (!resolvedQualifiableIntent.isUnresolved()) { + policyIntent.setQualifiableIntent(resolvedQualifiableIntent); + } else { + error("QualifiableIntentNotFound", resolver, qualifiableIntent, policyIntent); + //throw new ContributionResolveException("Qualifiable Intent - " + qualifiableIntent + //+ " not found for QualifiedIntent " + policyIntent); + } + } + } + } + + public void resolveDependent(Intent policyIntent, ModelResolver resolver) throws ContributionResolveException { + if (policyIntent instanceof ProfileIntent) + resolveProfileIntent((ProfileIntent)policyIntent, resolver); + + if (policyIntent instanceof QualifiedIntent) + resolveQualifiedIntent((QualifiedIntent)policyIntent, resolver); + + resolveContrainedArtifacts(policyIntent, resolver); + } + + public void resolve(T policyIntent, ModelResolver resolver) throws ContributionResolveException { + if (policyIntent instanceof ProfileIntent) { + resolveProfileIntent((ProfileIntent)policyIntent, resolver); + } + else { + resolveExcludedIntents(policyIntent, resolver); + } + + if (policyIntent instanceof QualifiedIntent) { + resolveQualifiedIntent((QualifiedIntent)policyIntent, resolver); + } + + resolveContrainedArtifacts(policyIntent, resolver); + + /* This is too late in the processing + if ( !policyIntent.isUnresolved() ) { + resolver.addModel(policyIntent); + } + */ + } + + public QName getArtifactType() { + return POLICY_INTENT_QNAME; + } + + private void readConstrainedArtifacts(Intent policyIntent, XMLStreamReader reader) throws ContributionReadException { + String value = reader.getAttributeValue(null, CONSTRAINS); + if ( policyIntent instanceof QualifiedIntent && value != null) { + error("ErrorInPolicyIntentDefinition", policyIntent, policyIntent.getName(), QUALIFIED_INTENT_CONSTRAINS_ERROR); + //String errorMsg = "Error in PolicyIntent Definition - " + policyIntent.getName() + QUALIFIED_INTENT_CONSTRAINS_ERROR; + //throw new ContributionReadException(errorMsg); + } else { + if (value != null) { + List<QName> constrainedArtifacts = policyIntent.getConstrains(); + for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) { + QName qname = getQNameValue(reader, tokens.nextToken()); + constrainedArtifacts.add(qname); + } + } + } + } + + private void readRequiredIntents(ProfileIntent policyIntent, XMLStreamReader reader) { + String value = reader.getAttributeValue(null, REQUIRES); + if (value != null) { + List<Intent> requiredIntents = policyIntent.getRequiredIntents(); + for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) { + QName qname = getQNameValue(reader, tokens.nextToken()); + Intent intent = policyFactory.createIntent(); + intent.setName(qname); + intent.setUnresolved(true); + requiredIntents.add(intent); + } + } + } + + private void readExcludedIntents(Intent policyIntent, XMLStreamReader reader) { + String value = reader.getAttributeValue(null, "excludes"); + if (value != null) { + List<Intent> excludedIntents = policyIntent.getExcludedIntents(); + for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) { + QName qname = getQNameValue(reader, tokens.nextToken()); + Intent intent = policyFactory.createIntent(); + intent.setName(qname); + intent.setUnresolved(true); + excludedIntents.add(intent); + } + } + } + + private void resolveExcludedIntents(Intent policyIntent, ModelResolver resolver) + throws ContributionResolveException { + if (policyIntent != null) { + // resolve all excluded intents + List<Intent> excludedIntents = new ArrayList<Intent>(); + for (Intent excludedIntent : policyIntent.getExcludedIntents()) { + if (excludedIntent.isUnresolved()) { + Intent resolvedExcludedIntent = resolver.resolveModel(Intent.class, excludedIntent); + if (!resolvedExcludedIntent.isUnresolved()) { + excludedIntents.add(resolvedExcludedIntent); + } else { + error("ExcludedIntentNotFound", resolver, excludedIntent, policyIntent); + return; + //throw new ContributionResolveException("Excluded Intent " + excludedIntent + //+ " not found for intent " + policyIntent); + } + } else { + excludedIntents.add(excludedIntent); + } + } + policyIntent.getExcludedIntents().clear(); + policyIntent.getExcludedIntents().addAll(excludedIntents); + } + } + +} |