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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.sca.implementation.widget.provider;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.web.javascript.ComponentJavaScriptGenerator;
/**
* Implements an invoker for resource component implementations.
*
* @version $Rev$ $Date$
*/
class WidgetImplementationInvoker implements Invoker {
private RuntimeComponent component;
private ComponentJavaScriptGenerator javaScriptGenerator;
private String widgetName;
private String widgetFolderURL;
private String widgetLocationURL;
WidgetImplementationInvoker(RuntimeComponent component, ComponentJavaScriptGenerator javaScriptGenerator, String widgetName, String widgetFolderURL, String widgetLocationURL) {
this.component = component;
this.javaScriptGenerator = javaScriptGenerator;
this.widgetName = widgetName + ".js";
this.widgetFolderURL = widgetFolderURL;
this.widgetLocationURL = widgetLocationURL;
}
public Message invoke(Message msg) {
// Get the resource id from the request message
String id = (String)((Object[])msg.getBody())[0];
try {
if (id.length() == 0) {
// Return an input stream for the widget resource
URL url = new URL(widgetLocationURL);
InputStream is = url.openStream();
msg.setBody(is);
} else if (id.equals(widgetName)) {
// Generate JavaScript header for use in the Widget
ByteArrayOutputStream bos = new ByteArrayOutputStream();
PrintWriter pw = new PrintWriter(bos);
javaScriptGenerator.generateJavaScriptCode(component, pw);
InputStream is = new ByteArrayInputStream(bos.toByteArray());
msg.setBody(is);
} else {
// Return an input stream for a resource inside the
// widget folder
URL url = new URL(widgetFolderURL +'/' + id);
InputStream is = url.openStream();
msg.setBody(is);
}
} catch (MalformedURLException e) {
// Report exception as a fault
msg.setFaultBody(e);
} catch (IOException e) {
// Report exception as a fault
msg.setFaultBody(e);
}
return msg;
}
}
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