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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.container.rhino.loader;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.tuscany.common.resource.ResourceLoader;
import org.apache.tuscany.container.rhino.assembly.JavaScriptImplementation;
import org.apache.tuscany.core.config.ConfigurationLoadException;
import org.apache.tuscany.core.config.InvalidRootElementException;
import org.apache.tuscany.core.config.MissingResourceException;
import org.apache.tuscany.core.config.SidefileLoadException;
import org.apache.tuscany.core.loader.LoaderContext;
import org.apache.tuscany.core.loader.StAXElementLoader;
import org.apache.tuscany.core.loader.StAXLoaderRegistry;
import org.apache.tuscany.core.loader.assembly.AssemblyConstants;
import org.apache.tuscany.core.system.annotation.Autowire;
import org.apache.tuscany.model.assembly.ComponentType;
import org.osoa.sca.annotations.Destroy;
import org.osoa.sca.annotations.Init;
import org.osoa.sca.annotations.Scope;
/**
* @version $Rev$ $Date$
*/
@Scope("MODULE")
public class JavaScriptImplementationLoader implements StAXElementLoader<JavaScriptImplementation> {
public static final QName IMPLEMENTATION_JS = new QName("http://org.apache.tuscany/xmlns/js/0.9", "implementation.js");
protected StAXLoaderRegistry registry;
private XMLInputFactory xmlFactory;
public JavaScriptImplementationLoader() {
// todo make this a reference to a system service
xmlFactory = XMLInputFactory.newInstance();
}
@Autowire
public void setRegistry(StAXLoaderRegistry registry) {
this.registry = registry;
}
@Init(eager = true)
public void start() {
registry.registerLoader(IMPLEMENTATION_JS, this);
}
@Destroy
public void stop() {
registry.unregisterLoader(IMPLEMENTATION_JS, this);
}
public JavaScriptImplementation load(XMLStreamReader reader, LoaderContext loaderContext) throws XMLStreamException, ConfigurationLoadException {
String scriptFile = reader.getAttributeValue(null, "scriptFile");
String script = loadScript(scriptFile, loaderContext.getResourceLoader());
ComponentType componentType = loadComponentType(scriptFile, loaderContext);
JavaScriptImplementation jsImpl = new JavaScriptImplementation();
jsImpl.setComponentType(componentType);
jsImpl.setScriptFile(scriptFile);
jsImpl.setScript(script);
jsImpl.setResourceLoader(loaderContext.getResourceLoader());
jsImpl.setTypeHelper(registry.getContext().getTypeHelper());
return jsImpl;
}
protected String loadScript(String scriptFile, ResourceLoader resourceLoader) throws ConfigurationLoadException {
URL url = resourceLoader.getResource(scriptFile);
if (url == null) {
throw new ConfigurationLoadException(scriptFile);
}
InputStream inputStream;
try {
inputStream = url.openStream();
} catch (IOException e) {
throw new ConfigurationLoadException(scriptFile, e);
}
try {
StringBuilder sb = new StringBuilder(1024);
int n;
while ((n = inputStream.read()) != -1) {
sb.append((char) n);
}
return sb.toString();
} catch (IOException e) {
throw new ConfigurationLoadException(scriptFile, e);
} finally {
try {
inputStream.close();
} catch (IOException e) {
// ignore
}
}
}
protected ComponentType loadComponentType(String scriptFile, LoaderContext loaderContext) throws SidefileLoadException, MissingResourceException{
String sidefile = scriptFile.substring(0, scriptFile.lastIndexOf('.')) + ".componentType";
URL componentTypeFile = loaderContext.getResourceLoader().getResource(sidefile);
if (componentTypeFile == null) {
throw new MissingResourceException(sidefile);
}
try {
XMLStreamReader reader;
InputStream is;
is = componentTypeFile.openStream();
try {
reader = xmlFactory.createXMLStreamReader(is);
try {
reader.nextTag();
if (!AssemblyConstants.COMPONENT_TYPE.equals(reader.getName())) {
InvalidRootElementException e = new InvalidRootElementException(AssemblyConstants.COMPONENT_TYPE, reader.getName());
e.setResourceURI(componentTypeFile.toString());
throw e;
}
return (ComponentType) registry.load(reader, loaderContext);
} finally {
try {
reader.close();
} catch (XMLStreamException e) {
// ignore
}
}
} finally {
try {
is.close();
} catch (IOException e) {
// ignore
}
}
} catch (IOException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(componentTypeFile.toString());
throw sfe;
} catch (XMLStreamException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(componentTypeFile.toString());
throw sfe;
} catch (ConfigurationLoadException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(componentTypeFile.toString());
throw sfe;
}
}
}
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