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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.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.osoa.sca.annotations.EagerInit;
import org.apache.tuscany.spi.deployer.DeploymentContext;
import org.apache.tuscany.spi.loader.ComponentTypeLoader;
import org.apache.tuscany.spi.loader.InvalidConfigurationException;
import org.apache.tuscany.spi.loader.LoaderException;
import org.apache.tuscany.spi.loader.LoaderRegistry;
import org.apache.tuscany.spi.loader.StAXElementLoader;
import org.apache.tuscany.spi.loader.UnrecognizedComponentTypeException;
import org.apache.tuscany.spi.loader.UnrecognizedElementException;
import org.apache.tuscany.spi.model.Implementation;
import org.apache.tuscany.spi.model.ModelObject;
/**
* The default implementation of a loader registry
*
* @version $Rev$ $Date$
*/
@EagerInit
public class LoaderRegistryImpl implements LoaderRegistry {
private Monitor monitor;
private final Map<QName, StAXElementLoader<? extends ModelObject>> loaders =
new HashMap<QName, StAXElementLoader<? extends ModelObject>>();
private final Map<Class<? extends Implementation<?>>,
ComponentTypeLoader<? extends Implementation<?>>> componentTypeLoaders =
new HashMap<Class<? extends Implementation<?>>, ComponentTypeLoader<? extends Implementation<?>>>();
public LoaderRegistryImpl(@org.apache.tuscany.api.annotation.Monitor Monitor monitor) {
this.monitor = monitor;
}
public <T extends ModelObject> void registerLoader(QName element, StAXElementLoader<T> loader) {
monitor.registeringLoader(element);
loaders.put(element, loader);
}
public <T extends ModelObject> void unregisterLoader(QName element, StAXElementLoader<T> loader) {
monitor.unregisteringLoader(element);
loaders.remove(element);
}
public ModelObject load(
ModelObject object,
XMLStreamReader reader,
DeploymentContext deploymentContext) throws XMLStreamException, LoaderException {
QName name = reader.getName();
monitor.elementLoad(name);
StAXElementLoader<? extends ModelObject> loader = loaders.get(name);
if (loader == null) {
throw new UnrecognizedElementException(name);
}
return loader.load(object, reader, deploymentContext);
}
public <MO extends ModelObject> MO load(
ModelObject object,
URL url,
Class<MO> type,
DeploymentContext ctx) throws LoaderException {
try {
XMLStreamReader reader;
InputStream is;
is = url.openStream();
try {
XMLInputFactory factory = ctx.getXmlFactory();
reader = factory.createXMLStreamReader(is);
try {
reader.nextTag();
QName name = reader.getName();
ModelObject mo = load(object, reader, ctx);
if (type.isInstance(mo)) {
return type.cast(mo);
} else {
UnrecognizedElementException e = new UnrecognizedElementException(name);
e.setResourceURI(url.toString());
throw e;
}
} catch (LoaderException e) {
Location location = reader.getLocation();
e.setLine(location.getLineNumber());
e.setColumn(location.getColumnNumber());
throw e;
} finally {
try {
reader.close();
} catch (XMLStreamException e) {
// ignore
}
}
} finally {
try {
is.close();
} catch (IOException e) {
// ignore
}
}
} catch (IOException e) {
LoaderException sfe = new LoaderException(e);
sfe.setResourceURI(url.toString());
throw sfe;
} catch (XMLStreamException e) {
throw new InvalidConfigurationException("Invalid or missing resource", url.toString(), e);
}
}
public <I extends Implementation<?>> void registerLoader(Class<I> key, ComponentTypeLoader<I> loader) {
componentTypeLoaders.put(key, loader);
}
public <I extends Implementation<?>> void unregisterLoader(Class<I> key) {
componentTypeLoaders.remove(key);
}
@SuppressWarnings("unchecked")
public <I extends Implementation<?>> void loadComponentType(I implementation,
DeploymentContext deploymentContext)
throws LoaderException {
Class<I> key = (Class<I>) implementation.getClass();
ComponentTypeLoader<I> loader = (ComponentTypeLoader<I>) componentTypeLoaders.get(key);
if (loader == null) {
throw new UnrecognizedComponentTypeException(key);
}
loader.load(implementation, deploymentContext);
}
public static interface Monitor {
/**
* Event emitted when a StAX element loader is registered.
*
* @param xmlType the QName of the element the loader will handle
*/
void registeringLoader(QName xmlType);
/**
* Event emitted when a StAX element loader is unregistered.
*
* @param xmlType the QName of the element the loader will handle
*/
void unregisteringLoader(QName xmlType);
/**
* Event emitted when a request is made to load an element.
*
* @param xmlType the QName of the element that should be loaded
*/
void elementLoad(QName xmlType);
}
}
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