diff options
Diffstat (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicySetProcessor.java')
| -rw-r--r-- | sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicySetProcessor.java | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicySetProcessor.java b/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicySetProcessor.java new file mode 100644 index 0000000000..ec36de5bec --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicySetProcessor.java @@ -0,0 +1,577 @@ +/* + * 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.Iterator; +import java.util.List; +import java.util.StringTokenizer; + +import javax.xml.XMLConstants; +import javax.xml.namespace.NamespaceContext; +import javax.xml.namespace.QName; +import javax.xml.stream.XMLStreamException; +import javax.xml.stream.XMLStreamReader; +import javax.xml.stream.XMLStreamWriter; +import javax.xml.xpath.XPath; +import javax.xml.xpath.XPathExpression; +import javax.xml.xpath.XPathExpressionException; + +import org.apache.tuscany.sca.common.xml.xpath.XPathHelper; +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.resolver.ModelResolver; +import org.apache.tuscany.sca.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.core.FactoryExtensionPoint; +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.policy.Intent; +import org.apache.tuscany.sca.policy.IntentMap; +import org.apache.tuscany.sca.policy.PolicyExpression; +import org.apache.tuscany.sca.policy.PolicyFactory; +import org.apache.tuscany.sca.policy.PolicySet; +import org.apache.tuscany.sca.policy.Qualifier; + +/** + * Processor for handling XML models of PolicySet definitions + * + * @version $Rev$ $Date$ + */ +public class PolicySetProcessor extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<PolicySet>, + PolicyConstants { + + private PolicyFactory policyFactory; + private StAXArtifactProcessor<Object> extensionProcessor; + private XPathHelper xpathHelper; + + // private XPathFactory xpathFactory; + + public PolicySetProcessor(ExtensionPointRegistry registry, StAXArtifactProcessor<Object> extensionProcessor) { + FactoryExtensionPoint modelFactories = registry.getExtensionPoint(FactoryExtensionPoint.class); + this.policyFactory = modelFactories.getFactory(PolicyFactory.class); + this.extensionProcessor = extensionProcessor; + this.xpathHelper = XPathHelper.getInstance(registry); + } + + /** + * Report a exception. + * + * @param problems + * @param message + * @param model + */ + private void error(Monitor monitor, String message, Object model, Exception ex) { + if (monitor != null) { + Problem problem = + monitor.createProblem(this.getClass().getName(), + Messages.RESOURCE_BUNDLE, + Severity.ERROR, + model, + message, + ex); + monitor.problem(problem); + } + } + + /** + * Report a error. + * + * @param problems + * @param message + * @param model + */ + private void error(Monitor monitor, String message, Object model, Object... messageParameters) { + if (monitor != null) { + Problem problem = + monitor.createProblem(this.getClass().getName(), + Messages.RESOURCE_BUNDLE, + Severity.ERROR, + model, + message, + (Object[])messageParameters); + monitor.problem(problem); + } + } + + public PolicySet read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException, + XMLStreamException { + PolicySet policySet = null; + Monitor monitor = context.getMonitor(); + String policySetName = reader.getAttributeValue(null, NAME); + String appliesTo = reader.getAttributeValue(null, APPLIES_TO); + if (policySetName == null || appliesTo == null) { + if (policySetName == null) + error(monitor, "PolicySetNameMissing", reader); + if (appliesTo == null) + error(monitor, "PolicySetAppliesToMissing", reader); + return policySet; + } + + policySet = policyFactory.createPolicySet(); + policySet.setName(new QName(policySetName)); + + //TODO: with 1.0 version of specs the applies to xpath is given related to the immediate + //parent whereas the runtime evaluates the xpath aginst the composite element. What the runtime + //is doing is what the future version of the specs could be tending towards. When that happens + //this 'if' must be deleted + if (appliesTo != null && !appliesTo.startsWith("/")) { + appliesTo = "//" + appliesTo; + } + + policySet.setAppliesTo(appliesTo); + + if (appliesTo != null) { + try { + XPath path = xpathHelper.newXPath(); + NamespaceContext nsContext = xpathHelper.getNamespaceContext(appliesTo, reader.getNamespaceContext()); + // path.setXPathFunctionResolver(new PolicyXPathFunctionResolver(context)); + XPathExpression expression = xpathHelper.compile(path, nsContext, appliesTo); + policySet.setAppliesToXPathExpression(expression); + } catch (XPathExpressionException e) { + ContributionReadException ce = new ContributionReadException(e); + error(monitor, "ContributionReadException", policySet, ce); + //throw ce; + } + } + + String attachTo = reader.getAttributeValue(null, ATTACH_TO); + if (attachTo != null) { + try { + XPath path = xpathHelper.newXPath(); + NamespaceContext nsContext = xpathHelper.getNamespaceContext(attachTo, reader.getNamespaceContext()); + path.setXPathFunctionResolver(new PolicyXPathFunctionResolver(nsContext)); + + attachTo = PolicyXPathFunction.normalize(attachTo,getSCAPrefix(nsContext)); + XPathExpression expression = xpathHelper.compile(path, nsContext, attachTo); + policySet.setAttachTo(attachTo); + policySet.setAttachToXPathExpression(expression); + } catch (XPathExpressionException e) { + ContributionReadException ce = new ContributionReadException(e); + error(monitor, "ContributionReadException", policySet, ce); + //throw ce; + } + + } + + readProvidedIntents(policySet, reader); + + int event = reader.getEventType(); + QName name = null; + reader.next(); + while (reader.hasNext()) { + event = reader.getEventType(); + switch (event) { + case START_ELEMENT: { + name = reader.getName(); + if (POLICY_INTENT_MAP_QNAME.equals(name)) { + Intent mappedIntent = policyFactory.createIntent(); + String provides = reader.getAttributeValue(null, PROVIDES); + if (provides != null) { + mappedIntent.setName(getQName(reader, PROVIDES)); + if (policySet.getProvidedIntents().contains(mappedIntent)) { + readIntentMap(reader, policySet, mappedIntent, context); + } else { + error(monitor, "IntentNotSpecified", policySet, policySetName); + } + } else { + error(monitor, "IntentMapProvidesMissing", reader, policySetName); + } + } else if (POLICY_SET_REFERENCE_QNAME.equals(name)) { + PolicySet referredPolicySet = policyFactory.createPolicySet(); + String referencename = reader.getAttributeValue(null, NAME); + if (referencename != null) { + referredPolicySet.setName(getQName(reader, NAME)); + policySet.getReferencedPolicySets().add(referredPolicySet); + } else { + error(monitor, "PolicySetReferenceNameMissing", reader, policySetName); + } + } /*else if ( WS_POLICY_QNAME.equals(name) ) { + OMElement policyElement = loadElement(reader); + org.apache.neethi.Policy wsPolicy = PolicyEngine.getPolicy(policyElement); + policySet.getPolicies().add(wsPolicy); + } */else { + Object extension = extensionProcessor.read(reader, context); + if (extension != null) { + PolicyExpression exp = policyFactory.createPolicyExpression(); + exp.setName(name); + exp.setPolicy(extension); + // check that all the policies in the policy set are + // expressed in the same language. Compare against the + // first expression we added + if ((policySet.getPolicies().size() > 0) && + (!policySet.getPolicies().get(0).getName().getNamespaceURI().equals(name.getNamespaceURI()))) { + error(monitor, "PolicyLanguageMissmatch", reader, policySet.getName(), policySet + .getPolicies().get(0).getName(), name); + } else { + policySet.getPolicies().add(exp); + } + } + } + break; + } + } + if (event == END_ELEMENT) { + if (POLICY_SET_QNAME.equals(reader.getName())) { + break; + } + } + + //Read the next element + if (reader.hasNext()) { + reader.next(); + } + } + return policySet; + } + + private String getSCAPrefix(NamespaceContext nsContext) { + + Iterator<String> iter = nsContext.getPrefixes(SCA11_NS); + while (iter.hasNext()) { + String prefix = iter.next(); + if (!prefix.equals(XMLConstants.DEFAULT_NS_PREFIX)) { + return prefix; + } + } + + return "__sca"; + } + + public void readIntentMap(XMLStreamReader reader, PolicySet policySet, Intent mappedIntent, ProcessorContext context) + throws ContributionReadException { + Monitor monitor = context.getMonitor(); + QName name = reader.getName(); + if (POLICY_INTENT_MAP_QNAME.equals(name)) { + + IntentMap intentMap = policyFactory.createIntentMap(); + QName intentName = getQName(reader, INTENT_MAP); + intentMap.setProvidedIntent(mappedIntent); + + if (!policySet.getIntentMaps().contains(intentMap)) { + policySet.getIntentMaps().add(intentMap); + } else { + Monitor.error(context.getMonitor(), this, Messages.RESOURCE_BUNDLE, "IntentMapIsNotUnique", policySet + .getName().toString(), mappedIntent.getName().getLocalPart()); + } + + String qualifierName = null; + String qualfiedIntentName = null; + Intent qualifiedIntent = null; + + Qualifier qualifier = null; + + int event = reader.getEventType(); + try { + reader.next(); + while (reader.hasNext()) { + event = reader.getEventType(); + switch (event) { + case START_ELEMENT: { + name = reader.getName(); + if (POLICY_INTENT_MAP_QUALIFIER_QNAME.equals(name)) { + qualifierName = getString(reader, NAME); + if (qualifierName != null) { + qualfiedIntentName = + mappedIntent.getName().getLocalPart() + QUALIFIER + qualifierName; + qualifiedIntent = policyFactory.createIntent(); + qualifiedIntent.setName(new QName(mappedIntent.getName().getNamespaceURI(), + qualfiedIntentName)); + qualifier = policyFactory.createQualifier(); + qualifier.setIntent(qualifiedIntent); + intentMap.getQualifiers().add(qualifier); + + } else { + error(monitor, "QualifierNameMissing", reader, policySet.getName()); + } + } else if (POLICY_INTENT_MAP_QNAME.equals(name)) { + QName providedIntent = getQName(reader, PROVIDES); + if (qualifierName.equals(providedIntent.getLocalPart())) { + readIntentMap(reader, policySet, qualifiedIntent, context); + } else { + error(monitor, + "IntentMapDoesNotMatch", + providedIntent, + providedIntent, + qualifierName, + policySet); + //throw new ContributionReadException("Intent provided by IntentMap " + + //providedIntent + " does not match parent qualifier " + qualifierName + + //" in policyset - " + policySet); + } + } else { + Object extension = extensionProcessor.read(reader, context); + if (extension != null && qualifier != null) { + PolicyExpression exp = policyFactory.createPolicyExpression(); + exp.setName(name); + exp.setPolicy(extension); + qualifier.getPolicies().add(exp); + } + } + break; + } + } + if (event == END_ELEMENT && POLICY_INTENT_MAP_QNAME.equals(reader.getName())) { + break; + } + //Read the next element + if (reader.hasNext()) { + reader.next(); + } + } + } catch (XMLStreamException e) { + ContributionReadException ce = new ContributionReadException(e); + error(monitor, "ContributionReadException", reader, ce); + throw ce; + } + } + } + + public void write(PolicySet policySet, XMLStreamWriter writer, ProcessorContext context) + throws ContributionWriteException, XMLStreamException { + + // Write an <sca:policySet> + writer.writeStartElement(SCA11_NS, POLICY_SET); + writer.writeNamespace(policySet.getName().getPrefix(), policySet.getName().getNamespaceURI()); + writer.writeAttribute(NAME, policySet.getName().getPrefix() + COLON + policySet.getName().getLocalPart()); + + if (policySet.getAppliesTo() != null){ + writer.writeAttribute(APPLIES_TO, policySet.getAppliesTo()); + } + + if (policySet.getAttachTo() != null){ + writer.writeAttribute(ATTACH_TO, policySet.getAttachTo()); + } + + writeProvidedIntents(policySet, writer); + + writer.writeEndElement(); + } + + private void readProvidedIntents(PolicySet policySet, XMLStreamReader reader) { + String value = reader.getAttributeValue(null, PROVIDES); + if (value != null) { + List<Intent> providedIntents = policySet.getProvidedIntents(); + for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) { + QName qname = getQNameValue(reader, tokens.nextToken()); + Intent intent = policyFactory.createIntent(); + intent.setName(qname); + providedIntents.add(intent); + } + } + } + + private void writeProvidedIntents(PolicySet policySet, XMLStreamWriter writer) throws XMLStreamException { + if (!policySet.getProvidedIntents().isEmpty()) { + StringBuffer sb = new StringBuffer(); + for (Intent providedIntents : policySet.getProvidedIntents()) { + sb.append(getQualifiedName(providedIntents.getName(), writer)); + sb.append(" "); + } + // Remove the last space + sb.deleteCharAt(sb.length() - 1); + writer.writeAttribute(PolicyConstants.PROVIDES, sb.toString()); + } + } + + private String getQualifiedName(QName name, XMLStreamWriter writer) throws XMLStreamException { + String local = name.getLocalPart(); + String prefix = writer.getPrefix(name.getNamespaceURI()); + if (prefix != null && prefix.length() > 0) { + return prefix + ':' + local; + } else { + return local; + } + } + + private void resolvePolicies(PolicySet policySet, ModelResolver resolver, ProcessorContext context) + throws ContributionResolveException { + boolean unresolved = false; + if (policySet != null) { + for (Object o : policySet.getPolicies()) { + extensionProcessor.resolve(o, resolver, context); + /*if ( o instanceof Policy && ((Policy)o).isUnresolved() ) { + unresolved = true; + }*/ + } + policySet.setUnresolved(unresolved); + } + } + + public QName getArtifactType() { + return POLICY_SET_QNAME; + } + + public Class<PolicySet> getModelType() { + return PolicySet.class; + } + + private void resolveProvidedIntents(PolicySet policySet, ModelResolver resolver, ProcessorContext context) + throws ContributionResolveException { + if (policySet != null) { + //resolve all provided intents + List<Intent> providedIntents = new ArrayList<Intent>(); + for (Intent providedIntent : policySet.getProvidedIntents()) { + if (providedIntent.isUnresolved()) { + Intent resolved = resolver.resolveModel(Intent.class, providedIntent, context); + if (!resolved.isUnresolved() || resolved != providedIntent) { + providedIntents.add(resolved); + } else { + error(context.getMonitor(), "ProvidedIntentNotFound", policySet, providedIntent, policySet); + return; + //throw new ContributionResolveException("Provided Intent - " + providedIntent + //+ " not found for PolicySet " + policySet); + } + } else { + providedIntents.add(providedIntent); + } + } + policySet.getProvidedIntents().clear(); + policySet.getProvidedIntents().addAll(providedIntents); + } + } + + private void resolveIntentsInMappedPolicies(PolicySet policySet, ModelResolver resolver, ProcessorContext context) + throws ContributionResolveException { + Monitor monitor = context.getMonitor(); + for (IntentMap intentMap : policySet.getIntentMaps()) { + Intent intent = intentMap.getProvidedIntent(); + if (intent.isUnresolved()) { + Intent resolved = resolver.resolveModel(Intent.class, intent, context); + if (!resolved.isUnresolved() || resolved != intent) { + intentMap.setProvidedIntent(resolved); + } else { + error(monitor, "MappedIntentNotFound", policySet, intent, policySet); + return; + //throw new ContributionResolveException("Mapped Intent - " + mappedIntent + //+ " not found for PolicySet " + policySet); + } + } + for (Qualifier qualifier : intentMap.getQualifiers()) { + intent = qualifier.getIntent(); + if (intent.isUnresolved()) { + Intent resolved = resolver.resolveModel(Intent.class, intent, context); + if (!resolved.isUnresolved() || resolved != intent) { + qualifier.setIntent(resolved); + } else { + error(monitor, "MappedIntentNotFound", policySet, intent, policySet); + return; + //throw new ContributionResolveException("Mapped Intent - " + mappedIntent + //+ " not found for PolicySet " + policySet); + } + } + for (PolicyExpression exp : qualifier.getPolicies()) { + // FIXME: How to resolve the policies? + } + } + // validate that the intent map has a qualifier for each + // intent qualifier. The above code has already checked that the + // qualifiers that are there are resolved + Intent providedIntent = intentMap.getProvidedIntent(); + if (intentMap.getQualifiers().size() != providedIntent.getQualifiedIntents().size()) { + String missingQualifiers = ""; + for (Intent loopQualifiedIntent : providedIntent.getQualifiedIntents()) { + boolean found = false; + for (Qualifier loopQualifier : intentMap.getQualifiers()) { + if (loopQualifier.getIntent().getName().equals(loopQualifiedIntent.getName())) { + found = true; + break; + } + } + if (!found) { + missingQualifiers += loopQualifiedIntent.getName().getLocalPart() + " "; + } + } + if (missingQualifiers.length() > 0) { + Monitor.error(context.getMonitor(), + this, + Messages.RESOURCE_BUNDLE, + "IntentMapMissingQualifiers", + policySet.getName().toString(), + providedIntent.getName().getLocalPart(), + missingQualifiers); + } + } + } + + } + + private void resolveReferredPolicySets(PolicySet policySet, ModelResolver resolver, ProcessorContext context) + throws ContributionResolveException { + + List<PolicySet> referredPolicySets = new ArrayList<PolicySet>(); + for (PolicySet referredPolicySet : policySet.getReferencedPolicySets()) { + if (referredPolicySet.isUnresolved()) { + PolicySet resolved = resolver.resolveModel(PolicySet.class, referredPolicySet, context); + if (!resolved.isUnresolved() || resolved != referredPolicySet) { + referredPolicySets.add(resolved); + } else { + error(context.getMonitor(), "ReferredPolicySetNotFound", policySet, referredPolicySet, policySet); + return; + //throw new ContributionResolveException("Referred PolicySet - " + referredPolicySet + //+ "not found for PolicySet - " + policySet); + } + } else { + referredPolicySets.add(referredPolicySet); + } + } + policySet.getReferencedPolicySets().clear(); + policySet.getReferencedPolicySets().addAll(referredPolicySets); + } + + private void includeReferredPolicySets(PolicySet policySet, PolicySet referredPolicySet) { + for (PolicySet furtherReferredPolicySet : referredPolicySet.getReferencedPolicySets()) { + includeReferredPolicySets(referredPolicySet, furtherReferredPolicySet); + } + policySet.getPolicies().addAll(referredPolicySet.getPolicies()); + policySet.getIntentMaps().addAll(referredPolicySet.getIntentMaps()); + } + + public void resolve(PolicySet policySet, ModelResolver resolver, ProcessorContext context) + throws ContributionResolveException { + if (policySet != null && policySet.isUnresolved()) { + resolveProvidedIntents(policySet, resolver, context); + resolveIntentsInMappedPolicies(policySet, resolver, context); + resolveReferredPolicySets(policySet, resolver, context); + + for (PolicySet referredPolicySet : policySet.getReferencedPolicySets()) { + includeReferredPolicySets(policySet, referredPolicySet); + } + + if (policySet.isUnresolved()) { + //resolve the policy attachments + resolvePolicies(policySet, resolver, context); + + /*if ( !policySet.isUnresolved() ) { + resolver.addModel(policySet); + }*/ + } + + policySet.setUnresolved(false); + } + } +} |