/*
* 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.javascript.wrapper;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Set;
import org.mozilla.javascript.NativeJavaObject;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
/** Base class for Scriptable objects, uses the NativeJavaObject wrapper to provide
* default wrapping of methods and properties (SLING-397)
*/
public abstract class ScriptableBase extends ScriptableObject {
private NativeJavaObject njo;
private final Set<String> jsMethods = getJsMethodNames();
public static final String JSFUNC_PREFIX = "jsFunction_";
protected Object getNative(String name, Scriptable start) {
final Object wrapped = getWrappedObject();
if(wrapped == null) {
return Scriptable.NOT_FOUND;
}
if(jsMethods.contains(name)) {
return Scriptable.NOT_FOUND;
}
if(njo == null) {
synchronized (this) {
if(njo == null) {
njo = new NativeJavaObject(start, wrapped, getStaticType());
}
}
}
return njo.get(name, start);
}
/** @return the Java object that we're wrapping, used to create a NativeJavaObject
* instance for default wrapping.
*/
protected abstract Object getWrappedObject();
/** @return the static type to use for NativeJavaObject wrapping */
protected abstract Class<?> getStaticType();
/** @return the Set of method names that clazz defines, i.e. all public methods
* with names that start with jsFunction_ */
private Set<String> getJsMethodNames() {
final Set<String> result = new HashSet<String>();
for(Method m : getClass().getMethods()) {
if(m.getName().startsWith(JSFUNC_PREFIX)) {
result.add(m.getName().substring(JSFUNC_PREFIX.length()));
}
}
return result;
}
}