/*
* 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.sling.scripting.jsp.taglib;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.sling.api.adapter.Adaptable;
import org.apache.sling.api.scripting.SlingBindings;
import org.apache.sling.api.scripting.SlingScriptHelper;
import org.apache.sling.commons.classloader.DynamicClassLoaderManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Tag for adapting adaptables to classes.
*/
public class AdaptToTag extends TagSupport {
private static final Logger log = LoggerFactory
.getLogger(AdaptToTag.class);
private static final long serialVersionUID = -1945089681840552408L;
private Adaptable adaptable;
private String adaptTo;
private String var;
/*
* (non-Javadoc)
*
* @see javax.servlet.jsp.tagext.TagSupport#doEndTag()
*/
@Override
public int doEndTag() {
log.trace("doEndTag");
ClassLoader classLoader = getClassLoader();
log.debug("Adapting adaptable " + adaptable + " to class " + adaptTo);
if (adaptable != null) {
Object adapted = null;
try {
Class<?> adaptToClass = classLoader.loadClass(adaptTo);
adapted = adaptable.adaptTo(adaptToClass);
} catch (ClassNotFoundException e) {
log.warn("Unable to retrieve class " + adaptTo, e);
}
log.debug("Saving " + adapted + " to variable " + var);
pageContext.setAttribute(var, adapted);
} else {
log.warn("Null adaptable specified");
}
return EVAL_PAGE;
}
/**
* Get the adaptable object to be adapted.
*
* @return the adaptable
*/
public Adaptable getAdaptable() {
return adaptable;
}
/**
* Gets the class name to adapt the adaptable to.
*
* @return the class to adapt to
*/
public String getAdaptTo() {
return adaptTo;
}
/**
* Method for retrieving the classloader from the OSGi console.
*
* @return the classloader
*/
protected ClassLoader getClassLoader() {
final SlingBindings bindings = (SlingBindings) pageContext.getRequest()
.getAttribute(SlingBindings.class.getName());
final SlingScriptHelper scriptHelper = bindings.getSling();
final DynamicClassLoaderManager dynamicClassLoaderManager = scriptHelper
.getService(DynamicClassLoaderManager.class);
final ClassLoader classLoader = dynamicClassLoaderManager
.getDynamicClassLoader();
return classLoader;
}
/**
* Gets the variable name to save the resulting object to.
*
* @return the variable name
*/
public String getVar() {
return var;
}
/**
* Sets the adaptable object to be adapted.
*
* @param adaptable
* the object to adapt
*/
public void setAdaptable(Adaptable adaptable) {
this.adaptable = adaptable;
}
/**
* Sets the class name to adapt the adaptable to.
*
* @param adaptTo
* the class to adapt to
*/
public void setAdaptTo(String adaptTo) {
this.adaptTo = adaptTo;
}
/**
* Gets the variable name to save the resulting object to.
*
* @param var
* the variable name
*/
public void setVar(String var) {
this.var = var;
}
}