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/ExternalAttachmentProcessor.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/ExternalAttachmentProcessor.java | 294 |
1 files changed, 294 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/ExternalAttachmentProcessor.java b/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/ExternalAttachmentProcessor.java new file mode 100644 index 0000000000..7b7855bd7a --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/policy/xml/ExternalAttachmentProcessor.java @@ -0,0 +1,294 @@ +/*
+ * 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 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.ExternalAttachment;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicyFactory;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Processor for handling XML models of ExternalAttachment definitions
+ *
+ * @version $Rev: 961010 $ $Date: 2010-07-06 13:34:54 -0700 (Tue, 06 Jul 2010) $
+ */
+public class ExternalAttachmentProcessor extends BaseStAXArtifactProcessor
+ implements StAXArtifactProcessor<ExternalAttachment>, PolicyConstants {
+
+
+ private PolicyFactory policyFactory;
+ private XPathHelper xpathHelper;
+
+ public ExternalAttachmentProcessor(ExtensionPointRegistry registry) {
+ FactoryExtensionPoint factories = registry.getExtensionPoint(FactoryExtensionPoint.class);
+ this.policyFactory = factories.getFactory(PolicyFactory.class);
+ this.xpathHelper = XPathHelper.getInstance(registry);
+ }
+
+ public Class<ExternalAttachment> getModelType() {
+ return ExternalAttachment.class;
+ }
+
+ public void resolve(ExternalAttachment attachment, ModelResolver resolver,
+ ProcessorContext context) throws ContributionResolveException {
+ if (attachment != null && attachment.isUnresolved()) {
+ resolveIntents(attachment, resolver, context);
+ resolvePolicySets(attachment, resolver, context);
+
+ attachment.setUnresolved(false);
+ }
+
+ }
+
+ private void resolvePolicySets(ExternalAttachment attachment,
+ ModelResolver resolver, ProcessorContext context) {
+ List<PolicySet> referredPolicySets = new ArrayList<PolicySet>();
+ for (PolicySet referredPolicySet : attachment.getPolicySets()) {
+ if (referredPolicySet.isUnresolved()) {
+ PolicySet resolved = resolver.resolveModel(PolicySet.class, referredPolicySet, context);
+ if (!resolved.isUnresolved() || resolved != referredPolicySet) {
+ referredPolicySets.add(resolved);
+ } else {
+ error(context.getMonitor(), "ReferredPolicySetNotFound", attachment, referredPolicySet, attachment);
+ return;
+ }
+ } else {
+ referredPolicySets.add(referredPolicySet);
+ }
+ }
+ attachment.getPolicySets().clear();
+ attachment.getPolicySets().addAll(referredPolicySets);
+
+ }
+
+ private void resolveIntents(ExternalAttachment attachment,
+ ModelResolver resolver, ProcessorContext context) {
+ if (attachment != null) {
+ //resolve all provided intents
+ List<Intent> providedIntents = new ArrayList<Intent>();
+ for (Intent providedIntent : attachment.getIntents()) {
+ if (providedIntent.isUnresolved()) {
+ Intent resolved = resolver.resolveModel(Intent.class, providedIntent, context);
+ if (!resolved.isUnresolved() || resolved != providedIntent) {
+ providedIntents.add(resolved);
+ } else {
+ error(context.getMonitor(), "ProvidedIntentNotFound", attachment, providedIntent, attachment);
+ return;
+ }
+ } else {
+ providedIntents.add(providedIntent);
+ }
+ }
+ attachment.getIntents().clear();
+ attachment.getIntents().addAll(providedIntents);
+ }
+
+ }
+
+ public QName getArtifactType() {
+ return EXTERNAL_ATTACHMENT_QNAME;
+ }
+
+ public ExternalAttachment read(XMLStreamReader reader, ProcessorContext context)
+ throws ContributionReadException, XMLStreamException {
+ ExternalAttachment attachment = policyFactory.createExternalAttachment();
+
+ readPolicySets(attachment, reader);
+ readIntents(attachment, reader, context);
+ readAttachTo(attachment, reader, context);
+
+ return attachment;
+ }
+
+ private void readIntents(ExternalAttachment attachment,
+ XMLStreamReader reader, ProcessorContext context) {
+ String value = reader.getAttributeValue(null, INTENTS);
+ if (value != null) {
+ List<Intent> intents = attachment.getIntents();
+ for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) {
+ QName qname = getQNameValue(reader, tokens.nextToken());
+ Intent intent = policyFactory.createIntent();
+ intent.setName(qname);
+ intents.add(intent);
+ }
+ }
+
+ }
+
+ private void readAttachTo(ExternalAttachment attachment,
+ XMLStreamReader reader, ProcessorContext context) {
+ Monitor monitor = context.getMonitor();
+
+ 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);
+ attachment.setAttachTo(attachTo);
+ attachment.setAttachToXPathExpression(expression);
+ } catch (XPathExpressionException e) {
+ ContributionReadException ce = new ContributionReadException(e);
+ error(monitor, "ContributionReadException", attachment, ce);
+ }
+ }
+
+ }
+
+ 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";
+ }
+ /**
+ * Reads policy sets associated with an external attachment element.
+ * @param subject
+ * @param operation
+ * @param reader
+ */
+ private void readPolicySets(ExternalAttachment attachment, XMLStreamReader reader) {
+
+
+ String value = reader.getAttributeValue(null, POLICY_SETS);
+ if (value != null) {
+ List<PolicySet> policySets = attachment.getPolicySets();
+ for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) {
+ QName qname = getQNameValue(reader, tokens.nextToken());
+ PolicySet policySet = policyFactory.createPolicySet();
+ policySet.setName(qname);
+ policySets.add(policySet);
+ }
+ }
+ }
+ public void write(ExternalAttachment attachment, XMLStreamWriter writer,
+ ProcessorContext context) throws ContributionWriteException,
+ XMLStreamException {
+ writePolicySets(attachment, writer, context);
+ writeIntents(attachment, writer, context);
+ writeAttachTo(attachment, writer, context);
+
+ }
+
+ private void writeAttachTo(ExternalAttachment attachment,
+ XMLStreamWriter writer, ProcessorContext context) throws XMLStreamException {
+ if ( attachment.getAttachTo() != null ) {
+ writer.writeAttribute(PolicyConstants.ATTACH_TO, attachment.getAttachTo());
+ }
+
+ }
+
+ private void writeIntents(ExternalAttachment attachment,
+ XMLStreamWriter writer, ProcessorContext context) throws XMLStreamException {
+ if (!attachment.getIntents().isEmpty()) {
+ StringBuffer sb = new StringBuffer();
+ for (Intent intent : attachment.getIntents()) {
+ sb.append(getQualifiedName(intent.getName(), writer));
+ sb.append(" ");
+ }
+ // Remove the last space
+ sb.deleteCharAt(sb.length() - 1);
+ writer.writeAttribute(PolicyConstants.INTENTS, sb.toString());
+ }
+
+ }
+
+ private void writePolicySets(ExternalAttachment attachment,
+ XMLStreamWriter writer, ProcessorContext context) throws XMLStreamException {
+ if ( !attachment.getPolicySets().isEmpty()) {
+ StringBuffer sb = new StringBuffer();
+ for (PolicySet ps : attachment.getPolicySets()) {
+ sb.append(getQualifiedName(ps.getName(), writer));
+ sb.append(" ");
+ }
+ // Remove the last space
+ sb.deleteCharAt(sb.length() - 1);
+ writer.writeAttribute(PolicyConstants.POLICY_SETS, 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;
+ }
+ }
+
+ /**
+ * 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);
+ }
+ }
+
+}
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