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/*
* 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.core.loader;
import java.util.HashMap;
import java.util.Map;
import javax.xml.namespace.QName;
import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import static org.osoa.sca.Constants.SCA_NS;
import org.osoa.sca.annotations.Constructor;
import org.osoa.sca.annotations.Reference;
import org.apache.tuscany.spi.deployer.DeploymentContext;
import org.apache.tuscany.spi.extension.LoaderExtension;
import org.apache.tuscany.spi.loader.LoaderException;
import org.apache.tuscany.spi.loader.LoaderRegistry;
import org.apache.tuscany.spi.loader.UnrecognizedElementException;
import org.apache.tuscany.spi.model.BindingDefinition;
import org.apache.tuscany.spi.model.ModelObject;
import org.apache.tuscany.spi.model.Multiplicity;
import org.apache.tuscany.spi.model.ReferenceDefinition;
import org.apache.tuscany.spi.model.ServiceContract;
/**
* Loads a reference from an XML-based assembly file
*
* @version $Rev$ $Date$
*/
public class ReferenceLoader extends LoaderExtension<ReferenceDefinition> {
public static final QName REFERENCE = new QName(SCA_NS, "reference");
private static final Map<String, Multiplicity> MULTIPLICITY = new HashMap<String, Multiplicity>(4);
static {
MULTIPLICITY.put("0..1", Multiplicity.ZERO_ONE);
MULTIPLICITY.put("1..1", Multiplicity.ONE_ONE);
MULTIPLICITY.put("0..n", Multiplicity.ZERO_N);
MULTIPLICITY.put("1..n", Multiplicity.ONE_N);
}
@Constructor
public ReferenceLoader(@Reference LoaderRegistry registry) {
super(registry);
}
public QName getXMLType() {
return REFERENCE;
}
public ReferenceDefinition load(ModelObject object, XMLStreamReader reader, DeploymentContext context)
throws XMLStreamException, LoaderException {
assert REFERENCE.equals(reader.getName());
String name = reader.getAttributeValue(null, "name");
String multiplicityVal = reader.getAttributeValue(null, "multiplicity");
Multiplicity multiplicity = multiplicity(multiplicityVal, Multiplicity.ONE_ONE);
ReferenceDefinition referenceDefinition = new ReferenceDefinition();
referenceDefinition.setMultiplicity(multiplicity);
referenceDefinition.setUri(context.getComponentId().resolve('#' + name));
while (true) {
switch (reader.next()) {
case START_ELEMENT:
ModelObject o = registry.load(null, reader, context);
if (o instanceof ServiceContract) {
referenceDefinition.setServiceContract((ServiceContract) o);
} else if (o instanceof BindingDefinition) {
referenceDefinition.addBinding((BindingDefinition) o);
} else {
throw new UnrecognizedElementException(reader.getName());
}
break;
case END_ELEMENT:
return referenceDefinition;
}
}
}
/**
* Convert a "multiplicity" attribute to the equivalent enum value.
*
* @param multiplicity the attribute to convert
* @param def the default value
* @return the enum equivalent
*/
private static Multiplicity multiplicity(String multiplicity, Multiplicity def) {
return multiplicity == null ? def : MULTIPLICITY.get(multiplicity);
}
}
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