1 files changed, 128 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java
new file mode 100644
index 0000000000..5ba08ab56b
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/jsp/ReferenceTag.java
@@ -0,0 +1,128 @@
+/*
+ * 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.web.runtime.jsp;
+
+import javax.servlet.ServletContext;
+import javax.servlet.jsp.JspException;
+import javax.servlet.jsp.PageContext;
+import javax.servlet.jsp.tagext.TagSupport;
+
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.oasisopen.sca.ServiceReference;
+
+/**
+ * Tag to handle SCA references
+ * <sca:reference name="service" type="test.MyService" scope="1" />
+ *
+ * @version $Rev$ $Date$
+ */
+public class ReferenceTag extends TagSupport {
+    private static final long serialVersionUID = 1L;
+
+    protected String name;
+    protected String type;
+    protected Integer scope = PageContext.PAGE_SCOPE;
+
+    @Override
+    public int doStartTag() throws JspException {
+        return SKIP_BODY;
+    }
+
+    @Override
+    public int doEndTag() throws JspException {
+
+        ServletContext servletContext = pageContext.getServletContext();
+        RuntimeComponent component = (RuntimeComponent)servletContext.getAttribute("org.apache.tuscany.sca.implementation.web.RuntimeComponent");
+        if (component == null) {
+            throw new JspException("No Web component found. Is there an <implementation.web> missing?");
+        }
+        
+        Class<?> typeClass;
+        try {
+            typeClass = Class.forName(type, true, Thread.currentThread().getContextClassLoader());
+        } catch (ClassNotFoundException e) {
+            throw new JspException("Reference '" + name + "' type class not found: " + type);
+        }
+        
+        try {
+            setInterfaceContract(component, typeClass);
+        } catch (InvalidInterfaceException e) {
+            throw new JspException("Exception creating interface", e);
+        }
+        
+        ServiceReference<?> sr = component.getComponentContext().getServiceReference(typeClass, name);
+        if (sr == null) {
+            throw new JspException("Reference '" + name + "' undefined");
+        }
+
+        pageContext.setAttribute(name, sr.getService(), scope);
+
+        return EVAL_PAGE;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getScope() {
+        return scope;
+    }
+
+    public void setScope(Integer scope) {
+        this.scope = scope;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    /**
+     * Implementation.web components currently don't use introspection to find the component type so unless an interface
+     * is explicitly defined on a refererence with <interface.java> then the InterfaceContract will be null. This will
+     * check for that and set the InterfaceContract from the Java class of the JSP tag.
+     */
+    private void setInterfaceContract(RuntimeComponent component, Class<?> typeClass) throws InvalidInterfaceException {
+        ComponentReference ref = component.getReference(name);
+        if (ref.getInterfaceContract() == null) {
+            ExtensionPointRegistry epr = component.getComponentContext().getExtensionPointRegistry();
+            FactoryExtensionPoint fep = epr.getExtensionPoint(FactoryExtensionPoint.class);
+            JavaInterfaceFactory jif = fep.getFactory(JavaInterfaceFactory.class);
+            JavaInterface javaIface = jif.createJavaInterface(typeClass);
+            InterfaceContract interfaceContract = jif.createJavaInterfaceContract();
+            interfaceContract.setInterface(javaIface);
+            ref.setInterfaceContract(interfaceContract);
+        }
+    }
+}