org.sca4j.loader.common.ComponentReferenceLoader Maven / Gradle / Ivy
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*
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* the Apache License, Version 2.0 and original code from project contributors.
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* Copyright (c) 2007 - 2008 fabric3 project contributors
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* not use this file except in compliance with the License. A copy of the license
* is included in this distrubtion or you may obtain a copy at
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* http://www.opensource.org/licenses/apache2.0.php
*
* 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.
*
* This project contains code licensed from the Apache Software Foundation under
* the Apache License, Version 2.0 and original code from project contributors.
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package org.sca4j.loader.common;
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.HashMap;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.oasisopen.sca.annotation.Reference;
import org.sca4j.introspection.IntrospectionContext;
import org.sca4j.introspection.xml.InvalidValue;
import org.sca4j.introspection.xml.Loader;
import org.sca4j.introspection.xml.LoaderHelper;
import org.sca4j.introspection.xml.TypeLoader;
import org.sca4j.introspection.xml.UnrecognizedAttribute;
import org.sca4j.introspection.xml.UnrecognizedElement;
import org.sca4j.introspection.xml.UnrecognizedElementException;
import org.sca4j.scdl.BindingDefinition;
import org.sca4j.scdl.ComponentReference;
import org.sca4j.scdl.ModelObject;
import org.sca4j.scdl.Multiplicity;
import org.sca4j.scdl.OperationDefinition;
import org.sca4j.scdl.ServiceContract;
/**
* Loads a reference from an XML-based assembly file
*
* @version $Rev: 5222 $ $Date: 2008-08-19 18:42:30 +0100 (Tue, 19 Aug 2008) $
*/
public class ComponentReferenceLoader implements TypeLoader {
private static final QName CALLBACK = new QName(SCA_NS, "callback");
private static final Map ATTRIBUTES = new HashMap();
static {
ATTRIBUTES.put("name", "name");
ATTRIBUTES.put("autowire", "autowire");
ATTRIBUTES.put("target", "target");
ATTRIBUTES.put("multiplicity", "multiplicity");
ATTRIBUTES.put("requires", "requires");
ATTRIBUTES.put("policySets", "policySets");
}
private final Loader loader;
private final LoaderHelper loaderHelper;
public ComponentReferenceLoader(@Reference Loader loader, @Reference LoaderHelper loaderHelper) {
this.loader = loader;
this.loaderHelper = loaderHelper;
}
public ComponentReference load(XMLStreamReader reader, IntrospectionContext context) throws XMLStreamException {
validateAttributes(reader, context);
String name = reader.getAttributeValue(null, "name");
if (name == null) {
MissingReferenceName failure = new MissingReferenceName(reader);
context.addError(failure);
return null;
}
ComponentReference reference = new ComponentReference(name);
boolean autowire = Boolean.parseBoolean(reader.getAttributeValue(null, "autowire"));
reference.setAutowire(autowire);
String value = reader.getAttributeValue(null, "multiplicity");
try {
Multiplicity multiplicity = Multiplicity.fromString(value);
if (multiplicity != null) {
reference.setMultiplicity(multiplicity);
}
} catch (IllegalArgumentException e) {
InvalidValue failure = new InvalidValue("Invalid multiplicity value: " + value, value, reader);
context.addError(failure);
}
String target = reader.getAttributeValue(null, "target");
List uris = new ArrayList();
if (target != null) {
StringTokenizer tokenizer = new StringTokenizer(target);
while (tokenizer.hasMoreTokens()) {
String token = tokenizer.nextToken();
uris.add(loaderHelper.getURI(token));
}
}
reference.getTargets().addAll(uris);
loaderHelper.loadPolicySetsAndIntents(reference, reader, context);
boolean callback = false;
while (true) {
switch (reader.next()) {
case START_ELEMENT:
callback = CALLBACK.equals(reader.getName());
if (callback) {
reader.nextTag();
}
QName elementName = reader.getName();
ModelObject type;
try {
type = loader.load(reader, ModelObject.class, context);
// TODO when the loader registry is replaced this try..catch must be replaced with a check for a loader and an
// UnrecognizedElement added to the context if none is found
} catch (UnrecognizedElementException e) {
UnrecognizedElement failure = new UnrecognizedElement(reader);
context.addError(failure);
continue;
}
if (type instanceof ServiceContract) {
reference.setServiceContract((ServiceContract) type);
} else if (type instanceof BindingDefinition) {
if (callback) {
reference.addCallbackBinding((BindingDefinition) type);
} else {
reference.addBinding((BindingDefinition) type);
}
} else if (type instanceof OperationDefinition) {
reference.addOperation((OperationDefinition) type);
} else if (type == null) {
// error loading, the element, ignore as an error will have been reported
break;
} else {
context.addError(new UnrecognizedElement(reader));
continue;
}
if (!reader.getName().equals(elementName) || reader.getEventType() != END_ELEMENT) {
throw new AssertionError("Loader must position the cursor to the end element");
}
break;
case END_ELEMENT:
if (callback) {
callback = false;
break;
}
return reference;
}
}
}
private void validateAttributes(XMLStreamReader reader, IntrospectionContext context) {
for (int i = 0; i < reader.getAttributeCount(); i++) {
String name = reader.getAttributeLocalName(i);
if (!ATTRIBUTES.containsKey(name)) {
context.addError(new UnrecognizedAttribute(name, reader));
}
}
}
}
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