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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.container.spring.loader;
import java.io.IOException;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
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 org.osoa.sca.annotations.Reference;
import org.apache.tuscany.spi.deployer.DeploymentContext;
import org.apache.tuscany.spi.extension.ComponentTypeLoaderExtension;
import org.apache.tuscany.spi.loader.LoaderException;
import org.apache.tuscany.spi.loader.LoaderRegistry;
import org.apache.tuscany.spi.loader.MissingResourceException;
import org.apache.tuscany.spi.model.Property;
import org.apache.tuscany.container.spring.model.ReferenceDeclaration;
import org.apache.tuscany.container.spring.model.ServiceDeclaration;
import org.apache.tuscany.container.spring.model.SpringComponentType;
import org.apache.tuscany.container.spring.model.SpringImplementation;
import org.springframework.core.io.Resource;
/**
* Introspects a Spring XML configuration file for its component type information. Other loader implementations may
* support alternative Spring configuration mechanisms.
*
* @version $Rev$ $Date$
*/
public class SpringXMLComponentTypeLoader extends ComponentTypeLoaderExtension<SpringImplementation> {
private static final String SCA_NS = "http://www.springframework.org/schema/sca";
private static final QName SERVICE_ELEMENT = new QName(SCA_NS, "service");
private static final QName REFERENCE_ELEMENT = new QName(SCA_NS, "reference");
private static final QName BEANS_ELEMENT = new QName("http://www.springframework.org/schema/beans", "beans");
public SpringXMLComponentTypeLoader(@Reference LoaderRegistry loaderRegistry) {
super(loaderRegistry);
}
@Override
protected Class<SpringImplementation> getImplementationClass() {
return SpringImplementation.class;
}
public void load(
SpringImplementation implementation,
DeploymentContext context) throws LoaderException {
if (implementation.getComponentType() != null) {
// FIXME hack since the builder registry loads the implementation type and the Spring implementation
// loader needs to as well. The second call is done by the builder registry and we just ignore it.
return;
}
SpringComponentType<Property<?>> type = new SpringComponentType<Property<?>>();
Resource resource = implementation.getApplicationResource();
loadFromXML(type, resource, context);
implementation.setComponentType(type);
}
private void loadFromXML(SpringComponentType<Property<?>> type, Resource resource, DeploymentContext context)
throws LoaderException {
XMLStreamReader reader;
try {
XMLInputFactory factory = context.getXmlFactory();
ClassLoader cl = context.getClassLoader();
reader = factory.createXMLStreamReader(resource.getInputStream());
boolean exposeAllBeans = true;
while (true) {
switch (reader.next()) {
case START_ELEMENT:
QName qname = reader.getName();
if (SERVICE_ELEMENT.equals(qname)) {
exposeAllBeans = false;
String name = reader.getAttributeValue(SCA_NS, "name");
Class<?> serviceType;
try {
serviceType = cl.loadClass(reader.getAttributeValue(SCA_NS, "type"));
} catch (ClassNotFoundException e) {
throw new MissingResourceException("Error loading service class", name, e);
}
String target = reader.getAttributeValue(SCA_NS, "target");
type.addServiceDeclaration(new ServiceDeclaration(name, serviceType, target));
} else if (REFERENCE_ELEMENT.equals(qname)) {
String name = reader.getAttributeValue(SCA_NS, "name");
Class<?> serviceType;
try {
serviceType = cl.loadClass(reader.getAttributeValue(SCA_NS, "type"));
} catch (ClassNotFoundException e) {
throw new MissingResourceException("Error loading service class", name, e);
}
type.addReferenceDeclaration(new ReferenceDeclaration(name, serviceType));
}
break;
case END_ELEMENT:
if (BEANS_ELEMENT.equals(reader.getName())) {
type.setExposeAllBeans(exposeAllBeans);
return;
}
}
}
} catch (IOException e) {
throw new LoaderException(e);
} catch (XMLStreamException e) {
throw new LoaderException(e);
}
}
}
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