| /* |
| * 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(); |
| |
| /** Used in testing, to check that the right wrapper is used. |
| * For some reason, defining the method here didn't work, it had to be |
| * defined in all descendant classes. |
| */ |
| public abstract Class<?> jsGet_javascriptWrapperClass(); |
| |
| /** @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; |
| } |
| } |