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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.script;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import static org.osoa.sca.Version.XML_NAMESPACE_1_0;
import org.osoa.sca.annotations.Constructor;
import org.apache.tuscany.spi.annotation.Autowire;
import org.apache.tuscany.spi.component.CompositeComponent;
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.LoaderUtil;
import org.apache.tuscany.spi.loader.MissingResourceException;
import org.apache.tuscany.spi.model.ModelObject;
/**
* Loader for handling implementation.script elements.
* <p/>
* <implementation.script script="path/foo.py" class="myclass">
*
* @version $Rev$ $Date$
*/
public class ScriptImplementationLoader extends LoaderExtension<ScriptImplementation> {
private static final QName IMPLEMENTATION_SCRIPT = new QName(XML_NAMESPACE_1_0, "implementation.script");
@Constructor({"registry"})
public ScriptImplementationLoader(@Autowire LoaderRegistry registry) {
super(registry);
}
public QName getXMLType() {
return IMPLEMENTATION_SCRIPT;
}
public ScriptImplementation load(CompositeComponent parent, ModelObject mo, XMLStreamReader reader,
DeploymentContext deploymentContext) throws XMLStreamException, LoaderException {
String scriptName = reader.getAttributeValue(null, "script");
if (scriptName == null) {
throw new MissingResourceException("implementation element has no 'script' attribute");
}
String className = reader.getAttributeValue(null, "class");
LoaderUtil.skipToEndElement(reader);
ClassLoader cl = deploymentContext.getClassLoader();
String scriptSource = loadSource(cl, scriptName);
// ScriptInstanceFactory instanceFactory = new ScriptInstanceFactory(scriptName, className, scriptSource, cl);
ScriptImplementation implementation = new ScriptImplementation();
implementation.setResourceName(scriptName);
implementation.setScriptSource(scriptSource);
implementation.setClassName(className);
implementation.setScriptName(scriptName);
implementation.setClassLoader(cl);
//implementation.setScriptInstanceFactory(instanceFactory);
registry.loadComponentType(parent, implementation, deploymentContext);
return implementation;
}
protected String loadSource(ClassLoader cl, String resource) throws LoaderException {
URL url = cl.getResource(resource);
if (url == null) {
throw new MissingResourceException(resource);
}
InputStream is;
try {
is = url.openStream();
} catch (IOException e) {
throw new MissingResourceException(resource, e);
}
try {
Reader reader = new InputStreamReader(is, "UTF-8");
char[] buffer = new char[1024];
StringBuilder source = new StringBuilder();
int count;
while ((count = reader.read(buffer)) > 0) {
source.append(buffer, 0, count);
}
return source.toString();
} catch (IOException e) {
throw new LoaderException(resource, e);
} finally {
try {
is.close();
} catch (IOException e) {
// ignore
}
}
}
}
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