org.sca4j.loader.definitions.DefinitionsLoader Maven / Gradle / Ivy
/**
* SCA4J
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* This project contains code licensed from the Apache Software Foundation under
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* 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.
*
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* the Apache License, Version 2.0 and original code from project contributors.
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* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
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* with the License. You may obtain a copy of the License at
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* Unless required by applicable law or agreed to in writing,
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package org.sca4j.loader.definitions;
import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
import static org.oasisopen.sca.Constants.SCA_NS;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.oasisopen.sca.annotation.EagerInit;
import org.oasisopen.sca.annotation.Init;
import org.oasisopen.sca.annotation.Reference;
import org.sca4j.host.contribution.ContributionException;
import org.sca4j.introspection.DefaultIntrospectionContext;
import org.sca4j.introspection.IntrospectionContext;
import org.sca4j.introspection.xml.Loader;
import org.sca4j.introspection.xml.UnrecognizedAttribute;
import org.sca4j.introspection.xml.UnrecognizedElementException;
import org.sca4j.scdl.ValidationContext;
import org.sca4j.scdl.definitions.AbstractDefinition;
import org.sca4j.scdl.definitions.BindingType;
import org.sca4j.scdl.definitions.ImplementationType;
import org.sca4j.scdl.definitions.Intent;
import org.sca4j.scdl.definitions.PolicySet;
import org.sca4j.spi.services.contribution.Resource;
import org.sca4j.spi.services.contribution.ResourceElementNotFoundException;
import org.sca4j.spi.services.contribution.XmlResourceElementLoader;
import org.sca4j.spi.services.contribution.XmlResourceElementLoaderRegistry;
/**
* Loader for definitions.
*
* @version $Revision$ $Date$
*/
@EagerInit
public class DefinitionsLoader implements XmlResourceElementLoader {
static final QName INTENT = new QName(SCA_NS, "intent");
static final QName DESCRIPTION = new QName(SCA_NS, "description");
static final QName POLICY_SET = new QName(SCA_NS, "policySet");
static final QName BINDING_TYPE = new QName(SCA_NS, "bindingType");
static final QName IMPLEMENTATION_TYPE = new QName(SCA_NS, "implementationType");
private static final QName DEFINITIONS = new QName(SCA_NS, "definitions");
private XmlResourceElementLoaderRegistry elementLoaderRegistry;
private Loader loaderRegistry;
public DefinitionsLoader(@Reference XmlResourceElementLoaderRegistry elementLoaderRegistry,
@Reference Loader loader) {
this.elementLoaderRegistry = elementLoaderRegistry;
this.loaderRegistry = loader;
}
@Init
public void init() {
elementLoaderRegistry.register(this);
}
public QName getType() {
return DEFINITIONS;
}
public void load(XMLStreamReader reader, URI contributionUri, Resource resource, ValidationContext context, ClassLoader loader)
throws ContributionException, XMLStreamException {
validateAttributes(reader, context);
List definitions = new ArrayList();
String targetNamespace = reader.getAttributeValue(null, "targetNamespace");
IntrospectionContext childContext = new DefaultIntrospectionContext(contributionUri, loader, targetNamespace);
while (true) {
switch (reader.next()) {
case START_ELEMENT:
QName qname = reader.getName();
AbstractDefinition definition = null;
if (INTENT.equals(qname)) {
try {
definition = loaderRegistry.load(reader, Intent.class, childContext);
} catch (UnrecognizedElementException e) {
throw new ContributionException(e);
}
} else if (POLICY_SET.equals(qname)) {
try {
definition = loaderRegistry.load(reader, PolicySet.class, childContext);
} catch (UnrecognizedElementException e) {
throw new ContributionException(e);
}
} else if (BINDING_TYPE.equals(qname)) {
try {
definition = loaderRegistry.load(reader, BindingType.class, childContext);
} catch (UnrecognizedElementException e) {
throw new ContributionException(e);
}
} else if (IMPLEMENTATION_TYPE.equals(qname)) {
try {
definition = loaderRegistry.load(reader, ImplementationType.class, childContext);
} catch (UnrecognizedElementException e) {
throw new ContributionException(e);
}
}
if (definition != null) {
definitions.add(definition);
}
break;
case END_ELEMENT:
assert DEFINITIONS.equals(reader.getName());
// update indexed elements with the loaded definitions
for (AbstractDefinition candidate : definitions) {
boolean found = false;
for (DefinitionResourceElement element : resource.getResourceElements(DefinitionResourceElement.class)) {
QName candidateSymbol = candidate.getName();
if (element.getSymbol().equals(candidateSymbol)) {
element.setDefinition(candidate);
found = true;
}
}
if (!found) {
String id = candidate.toString();
// xcv should not throw?
throw new ResourceElementNotFoundException("Definition not found: " + id, id);
}
}
if (childContext.hasErrors()) {
context.addErrors(childContext.getErrors());
}
if (childContext.hasWarnings()) {
context.addWarnings(childContext.getWarnings());
}
return;
}
}
}
private void validateAttributes(XMLStreamReader reader, ValidationContext context) {
for (int i = 0; i < reader.getAttributeCount(); i++) {
String name = reader.getAttributeLocalName(i);
if (!"targetNamespace".equals(name)) {
context.addError(new UnrecognizedAttribute(name, reader));
}
}
}
}
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