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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.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);
}
}
}
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