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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.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.ComponentProperty;
import org.apache.tuscany.sca.assembly.ComponentReference;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Implements an invoker for resource component implementations.
*
* @version $Rev$ $Date$
*/
class WidgetImplementationInvoker implements Invoker {
private RuntimeComponent component;
private String widgetName;
private String widgetFolderURL;
private String widgetLocationURL;
WidgetImplementationInvoker(RuntimeComponent component, String widgetName, String widgetFolderURL, String widgetLocationURL) {
this.component = component;
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
InputStream is = generateWidgetCode();
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 (URISyntaxException e) {
// Report exception as a fault
msg.setFaultBody(e);
} catch (IOException e) {
// Report exception as a fault
msg.setFaultBody(e);
}
return msg;
}
/**
* This helper class concatenates the necessary JavaScript client code into a
* single JavaScript per component
*/
private InputStream generateWidgetCode() throws IOException, URISyntaxException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
PrintWriter pw = new PrintWriter(bos);
pw.println();
pw.println("/* Apache Tuscany SCA Widget header */");
pw.println();
Map<String, Boolean> bindingClientProcessed = new HashMap<String, Boolean>();
for(ComponentReference reference : component.getReferences()) {
for(Binding binding : reference.getBindings()) {
String bindingProxyName = WidgetProxyHelper.getJavaScriptProxyFile(binding.getClass().getName());
//check if binding client code was already processed and inject to the generated script
Boolean processedFlag = bindingClientProcessed.get(bindingProxyName);
if( processedFlag == null || processedFlag.booleanValue() == false) {
if(bindingProxyName != null) {
generateJavaScriptBindingProxy(pw,bindingProxyName);
bindingClientProcessed.put(bindingProxyName, Boolean.TRUE);
}
}
}
}
//process properties
generateJavaScriptPropertyFunction(pw);
//process references
generateJavaScriptReferenceFunction(pw);
pw.println();
pw.println("/** End of Apache Tuscany SCA Widget */");
pw.println();
pw.flush();
pw.close();
return new ByteArrayInputStream(bos.toByteArray());
}
/**
* Retrieve the binding proxy based on the bind name
* and embedded the JavaScript into this js
*/
private void generateJavaScriptBindingProxy(PrintWriter pw, String bindingProxyName) throws IOException {
//FIXME: Handle the case where the JavaScript binding client is not found
InputStream is = getClass().getClassLoader().getResourceAsStream(bindingProxyName);
if (is != null) {
int i;
while ((i = is.read()) != -1) {
pw.write(i);
}
}
pw.println();
pw.println();
}
/**
* Generate JavaScript code to inject SCA Properties
* @param pw
* @throws IOException
*/
private void generateJavaScriptPropertyFunction(PrintWriter pw) throws IOException {
pw.println("var propertyMap = new String();");
for(ComponentProperty property : component.getProperties()) {
String propertyName = property.getName();
pw.println("propertyMap." + propertyName + " = \"" + getPropertyValue(property) + "\"");
}
pw.println("function Property(name) {");
pw.println(" return propertyMap[name];");
pw.println("}");
}
/**
* Convert property value to String
* @param property
* @return
*/
private String getPropertyValue(ComponentProperty property) {
Document doc = (Document)property.getValue();
Element rootElement = doc.getDocumentElement();
String value = null;
//FIXME : Provide support for isMany and other property types
if (rootElement.getChildNodes().getLength() > 0) {
value = rootElement.getChildNodes().item(0).getTextContent();
}
return value;
}
/**
* Generate JavaScript code to inject SCA References
* @param pw
* @throws IOException
*/
private void generateJavaScriptReferenceFunction (PrintWriter pw) throws IOException, URISyntaxException {
pw.println("var referenceMap = new Object();");
for(ComponentReference reference : component.getReferences()) {
String referenceName = reference.getName();
Binding binding = reference.getBindings().get(0);
if (binding != null) {
String proxyClient = WidgetProxyHelper.getJavaScriptProxyClient(binding.getClass().getName());
if(proxyClient != null) {
// Generate the JavaScript proxy configuration code
// Proxies are configured with the target URI path, as at this point we shouldn't
// be generating proxies that communicate with other hosts (if a proxy needs to
// communicate with another host it should be generated on and served by
// that particular host)
URI targetURI = URI.create(binding.getURI());
String targetPath = targetURI.getPath();
if(proxyClient.equals("JSONRpcClient")) {
//FIXME Proxies should follow the same pattern, saving us from having to test
// for JSONRpc here
pw.println("referenceMap." + referenceName + " = new " + proxyClient + "(\"" + targetPath + "\").Service;");
} else {
pw.println("referenceMap." + referenceName + " = new " + proxyClient + "(\"" + targetPath + "\");");
}
}
}
}
pw.println("function Reference(name) {");
pw.println(" return referenceMap[name];");
pw.println("}");
}
}
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