diff options
author | dims <dims@13f79535-47bb-0310-9956-ffa450edef68> | 2008-06-17 00:23:01 +0000 |
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committer | dims <dims@13f79535-47bb-0310-9956-ffa450edef68> | 2008-06-17 00:23:01 +0000 |
commit | bdd0a41aed7edf21ec2a65cfa17a86af2ef8c48a (patch) | |
tree | 38a92061c0793434c4be189f1d70c3458b6bc41d /branches/sca-java-1.0/modules/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java |
Move Tuscany from Incubator to top level.
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'branches/sca-java-1.0/modules/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java')
-rw-r--r-- | branches/sca-java-1.0/modules/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/branches/sca-java-1.0/modules/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java b/branches/sca-java-1.0/modules/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java new file mode 100644 index 0000000000..d66e6dbe86 --- /dev/null +++ b/branches/sca-java-1.0/modules/policy-xml/src/main/java/org/apache/tuscany/sca/policy/xml/PolicyIntentProcessor.java @@ -0,0 +1,303 @@ +/*
+ * 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.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
+ */
+
+public abstract class PolicyIntentProcessor<T extends Intent> extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<T>, PolicyConstants {
+
+ private PolicyFactory policyFactory;
+
+ public PolicyIntentProcessor(ModelFactoryExtensionPoint modelFactories) {
+ this.policyFactory = modelFactories.getFactory(PolicyFactory.class);
+ }
+
+ public PolicyIntentProcessor(PolicyFactory policyFactory, StAXArtifactProcessor<Object> extensionProcessor) {
+ this.policyFactory = policyFactory;
+ }
+
+ public T read(XMLStreamReader reader) throws ContributionReadException, XMLStreamException {
+ Intent policyIntent = null;
+ String policyIntentName = reader.getAttributeValue(null, NAME);
+ // 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(getQNameValue(reader,
+ policyIntentName.substring(0, qualifierIndex)));
+
+ ((QualifiedIntent)policyIntent).setQualifiableIntent(qualifiableIntent);
+ } else {
+ policyIntent = policyFactory.createIntent();
+ }
+ policyIntent.setName(getQNameValue(reader, policyIntentName));
+
+ if ( policyIntent instanceof ProfileIntent ) {
+ readRequiredIntents((ProfileIntent)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());
+ }
+ }
+
+ 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 {
+ 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);
+ if (resolvedRequiredIntent != null) {
+ requiredIntents.add(resolvedRequiredIntent);
+ } else {
+ 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);
+
+ if (resolvedQualifiableIntent != null) {
+ policyIntent.setQualifiableIntent(resolvedQualifiableIntent);
+ } else {
+ throw new ContributionResolveException("Qualifiable Intent - " + qualifiableIntent
+ + " not found for QualifiedIntent "
+ + policyIntent);
+ }
+
+ }
+ }
+ }
+
+ public void resolve(T policyIntent, ModelResolver resolver) throws ContributionResolveException {
+ if (policyIntent instanceof ProfileIntent) {
+ resolveProfileIntent((ProfileIntent)policyIntent, resolver);
+ }
+
+ if (policyIntent instanceof QualifiedIntent) {
+ resolveQualifiedIntent((QualifiedIntent)policyIntent, resolver);
+ }
+
+ resolveContrainedArtifacts(policyIntent, resolver);
+
+ 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) {
+ 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);
+ }
+ }
+ }
+
+}
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