diff options
Diffstat (limited to 'sandbox/sebastien/java/sca-node/modules/implementation-widget-runtime/src/main/java/org/apache/tuscany/sca/implementation/widget/provider/WidgetImplementationInvoker.java')
| -rw-r--r-- | sandbox/sebastien/java/sca-node/modules/implementation-widget-runtime/src/main/java/org/apache/tuscany/sca/implementation/widget/provider/WidgetImplementationInvoker.java | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/sandbox/sebastien/java/sca-node/modules/implementation-widget-runtime/src/main/java/org/apache/tuscany/sca/implementation/widget/provider/WidgetImplementationInvoker.java b/sandbox/sebastien/java/sca-node/modules/implementation-widget-runtime/src/main/java/org/apache/tuscany/sca/implementation/widget/provider/WidgetImplementationInvoker.java new file mode 100644 index 0000000000..6ea37321e7 --- /dev/null +++ b/sandbox/sebastien/java/sca-node/modules/implementation-widget-runtime/src/main/java/org/apache/tuscany/sca/implementation/widget/provider/WidgetImplementationInvoker.java @@ -0,0 +1,240 @@ +/* + * 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.URL; + +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.assembly.OptimizableBinding; +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 (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 { + ByteArrayOutputStream bos = new ByteArrayOutputStream(); + PrintWriter pw = new PrintWriter(bos); + + pw.println(); + pw.println("/* Apache Tuscany SCA Widget header */"); + pw.println(); + + for(ComponentReference reference : component.getReferences()) { + for(Binding binding : reference.getBindings()) { + String bindingProxyName = WidgetProxyHelper.getJavaScriptProxyFile(binding.getClass().getName()); + if(bindingProxyName != null) { + generateJavaScriptBindingProxy(pw,bindingProxyName); + } + } + } + + //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 { + + 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) { + + //FIXME Eventually the binding URI should be initialized from the SCA domain + // for now point to the target binding model directly, assuming that it's available + // in the same node + String targetURI = null; + if (binding instanceof OptimizableBinding) { + Binding targetBinding = ((OptimizableBinding)binding).getTargetBinding(); + if (targetBinding != null) { + targetURI = URI.create(targetBinding.getURI()).getPath(); + } + } + if (targetURI == null) { + targetURI = URI.create(binding.getURI()).getPath(); + if (!targetURI.startsWith("/")) { + targetURI = "/" + targetURI; + } + } + + if(proxyClient.equals("JSONRpcClient")) { + pw.println("referenceMap." + referenceName + " = new " + proxyClient + "(\"" + targetURI + "\").Service;"); + } else { + pw.println("referenceMap." + referenceName + " = new " + proxyClient + "(\"" + targetURI + "\");"); + } + } + } + } + + pw.println("function Reference(name) {"); + pw.println(" return referenceMap[name];"); + pw.println("}"); + } + +} |