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/**
*
* Copyright 2005 The Apache Software Foundation
*
* Licensed 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.assembly;
import java.util.List;
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 org.apache.tuscany.common.resource.ResourceLoader;
import org.apache.tuscany.core.builder.ObjectFactory;
import org.apache.tuscany.core.config.ConfigurationLoadException;
import org.apache.tuscany.core.loader.InvalidPropertyFactoryException;
import org.apache.tuscany.core.loader.LoaderContext;
import org.apache.tuscany.core.loader.StAXPropertyFactory;
import org.apache.tuscany.core.loader.StAXUtil;
import static org.apache.tuscany.core.loader.assembly.AssemblyConstants.*;
import org.apache.tuscany.core.system.annotation.Autowire;
import org.apache.tuscany.model.assembly.AssemblyObject;
import org.apache.tuscany.model.assembly.Component;
import org.apache.tuscany.model.assembly.ComponentType;
import org.apache.tuscany.model.assembly.ConfiguredProperty;
import org.apache.tuscany.model.assembly.ConfiguredReference;
import org.apache.tuscany.model.assembly.Implementation;
import org.apache.tuscany.model.assembly.OverrideOption;
import org.apache.tuscany.model.assembly.Property;
import org.osoa.sca.annotations.Scope;
/**
* @version $Rev$ $Date$
*/
@Scope("MODULE")
public class ComponentLoader extends AbstractLoader {
private StAXPropertyFactory<?> defaultPropertyFactory;
@Autowire
public void setDefaultPropertyFactory(StAXPropertyFactory<?> defaultPropertyFactory) {
this.defaultPropertyFactory = defaultPropertyFactory;
}
public QName getXMLType() {
return COMPONENT;
}
public Component load(XMLStreamReader reader, LoaderContext loaderContext) throws XMLStreamException, ConfigurationLoadException {
assert COMPONENT.equals(reader.getName());
Component component = factory.createSimpleComponent();
component.setName(reader.getAttributeValue(null, "name"));
while (true) {
switch (reader.next()) {
case START_ELEMENT:
QName name = reader.getName();
if (PROPERTIES.equals(name)) {
loadProperties(reader, loaderContext.getResourceLoader(), component);
} else if (REFERENCES.equals(name)) {
loadReferences(reader, component);
} else {
AssemblyObject o = registry.load(reader, loaderContext);
if (o instanceof Implementation) {
Implementation impl = (Implementation) o;
impl.initialize(registry.getContext());
component.setImplementation(impl);
}
}
reader.next();
break;
case END_ELEMENT:
List<Property> props = component.getImplementation().getComponentType().getProperties();
for (Property property : props) {
if (property.isRequired()) {
if (component.getConfiguredProperty(property.getName()) == null) {
ConfigurationLoadException e = new ConfigurationLoadException("Required property not configured");
e.setIdentifier(property.getName());
throw e;
}
}
}
return component;
}
}
}
protected void loadProperties(XMLStreamReader reader, ResourceLoader resourceLoader, Component<?> component) throws XMLStreamException, ConfigurationLoadException {
ComponentType componentType = component.getImplementation().getComponentType();
List<ConfiguredProperty> configuredProperties = component.getConfiguredProperties();
while (true) {
switch (reader.next()) {
case START_ELEMENT:
String name = reader.getLocalName();
Property property = componentType.getProperty(name);
if (property == null) {
throw new ConfigurationLoadException(name);
}
OverrideOption override = StAXUtil.overrideOption(reader.getAttributeValue(null, "override"), OverrideOption.NO);
// get a factory for the property
StAXPropertyFactory<?> propertyFactory;
String factoryName = reader.getAttributeValue(null, "factory");
if (factoryName == null) {
propertyFactory = defaultPropertyFactory;
} else {
propertyFactory = getPropertyFactory(factoryName, resourceLoader);
}
// create the property value
// FIXME to support complex types we probably should store the factory in the ConfiguredProperty
// FIXME instead of the value as the value may be mutable and should not be shared between instances
ObjectFactory<?> objectFactory = propertyFactory.createObjectFactory(reader, property);
Object value = objectFactory.getInstance();
// create the configured property definition
ConfiguredProperty configuredProperty = factory.createConfiguredProperty();
configuredProperty.setName(name);
configuredProperty.setValue(value);
configuredProperty.setOverrideOption(override);
configuredProperties.add(configuredProperty);
break;
case END_ELEMENT:
return;
}
}
}
protected StAXPropertyFactory<?> getPropertyFactory(String factoryName, ResourceLoader resourceLoader) throws InvalidPropertyFactoryException {
Class<?> impl;
try {
// try to load factory from application classloader
impl = resourceLoader.loadClass(factoryName);
} catch (ClassNotFoundException e) {
try {
// try to load factory from container classloader
impl = Class.forName(factoryName);
} catch (ClassNotFoundException e1) {
throw new InvalidPropertyFactoryException(factoryName, e);
}
}
try {
return (StAXPropertyFactory<?>) impl.newInstance();
} catch (InstantiationException e) {
throw new InvalidPropertyFactoryException(factoryName, e);
} catch (IllegalAccessException e) {
throw new InvalidPropertyFactoryException(factoryName, e);
} catch (ClassCastException e) {
throw new InvalidPropertyFactoryException(factoryName, e);
}
}
protected void loadReferences(XMLStreamReader reader, Component<?> component) throws XMLStreamException {
List<ConfiguredReference> configuredReferences = component.getConfiguredReferences();
while (true) {
switch (reader.next()) {
case START_ELEMENT:
String name = reader.getLocalName();
String uri = reader.getElementText();
ConfiguredReference configuredReference = component.getConfiguredReference(name);
if (configuredReference == null) {
configuredReference = factory.createConfiguredReference();
configuredReference.setName(name);
configuredReferences.add(configuredReference);
}
configuredReference.getTargets().add(uri);
break;
case END_ELEMENT:
return;
}
}
}
}
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