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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.binding.ejb.util;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import org.oasisopen.sca.ServiceRuntimeException;
/**
* An adapter for java classes, indexes the methods by name and provides an
* invoke method that takes a method name.
*
* @version $Rev$ $Date$
*/
final class JavaReflectionAdapter {
private static Map<Class, JavaReflectionAdapter> adapters =
Collections.synchronizedMap(new WeakHashMap<Class, JavaReflectionAdapter>());
private static final Map<Class, Object> DEFAULT_VALUES = new HashMap<Class, Object>();
static {
DEFAULT_VALUES.put(boolean.class, Boolean.FALSE);
DEFAULT_VALUES.put(byte.class, new Byte((byte)0));
DEFAULT_VALUES.put(char.class, new Character((char)0));
DEFAULT_VALUES.put(short.class, new Short((short)0));
DEFAULT_VALUES.put(int.class, Integer.valueOf(0));
DEFAULT_VALUES.put(long.class, new Long(0));
DEFAULT_VALUES.put(float.class, new Float(0.0));
DEFAULT_VALUES.put(double.class, new Double(0.0));
}
private Map<String, Method> methodMap = new HashMap<String, Method>();
/**
* Constructor
*
* @param clazz
*/
private JavaReflectionAdapter(final Class clazz) {
// Index the methods on the implementation class
// FIXME J2 Security - promote this to callers of this method
Method[] methods = AccessController.doPrivileged(new PrivilegedAction<Method[]>() {
public Method[] run() {
return clazz.getMethods();
}
});
for (int i = 0; i < methods.length; i++) {
methodMap.put(methods[i].getName(), methods[i]);
}
}
/**
* Create a java reflection adapter
*
* @param clazz
*/
static synchronized JavaReflectionAdapter createJavaReflectionAdapter(Class clazz) {
JavaReflectionAdapter adapter = (JavaReflectionAdapter)adapters.get(clazz);
if (adapter == null) {
adapter = new JavaReflectionAdapter(clazz);
adapters.put(clazz, adapter);
}
return adapter;
}
/**
* Return the specified method
*
* @param methodName
* @return
* @throws NoSuchMethodException
*/
Method getMethod(String methodName) throws NoSuchMethodException {
Method method = (Method)methodMap.get(methodName);
if (method == null) {
throw new NoSuchMethodException(methodName);
}
return method;
}
/**
* Returns a map containing the methods on the class, keyed by name
*
* @return
*/
Map getMethods() {
return methodMap;
}
/**
* Invoke a method using Java reflection.
*
* @param method
* @param object
* @param args
* @return
* @throws InvocationTargetException
* @throws IllegalAccessException
*/
Object invoke(Method method, Object object, Object[] args) throws InvocationTargetException,
IllegalAccessException {
Class[] parameterTypes = method.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
Class parameterType = parameterTypes[i];
if (args[i] == null && parameterType.isPrimitive()) {
args[i] = DEFAULT_VALUES.get(parameterType);
}
}
return method.invoke(object, args);
}
/**
* Set the java bean property
*
* @param bean
* @param propertyName
* @param value
* @return
*/
boolean setProperty(Object bean, String propertyName, Object value) {
try {
PropertyDescriptor propertyDescriptor = new PropertyDescriptor(propertyName, bean.getClass());
Method writeMethod = propertyDescriptor.getWriteMethod();
writeMethod.invoke(bean, new Object[] {value});
return true;
} catch (InvocationTargetException e) {
throw new ServiceRuntimeException(e.getTargetException());
} catch (Exception e) {
return false;
}
}
}
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