experimental/trunk_core_with_pluggable_logger/core/src/main/java/org/apache/myfaces/extensions/validator/util/ReflectionUtils.java

/*
 * 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.myfaces.extensions.validator.util;

import org.apache.myfaces.extensions.validator.internal.UsageCategory;
import org.apache.myfaces.extensions.validator.internal.UsageInformation;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @author Gerhard Petracek
 */
@UsageInformation(UsageCategory.INTERNAL)
public class ReflectionUtils
{
    public static Method tryToGetMethod(Class targetClass, String targetMethodName)
    {
        return tryToGetMethod(targetClass, targetMethodName, null);
    }

    public static Method tryToGetMethod(Class targetClass, String targetMethodName, Class[] parameterTypes)
    {
        try
        {
            return getMethod(targetClass, targetMethodName, parameterTypes);
        }
        catch (Throwable t)
        {
            //do nothing - it's just a try
            return null;
        }
    }

    public static Method getMethod(Class targetClass, String targetMethodName)
        throws NoSuchMethodException
    {
        return getMethod(targetClass, targetMethodName, null);
    }

    public static Method getMethod(Class targetClass, String targetMethodName, Class[] parameterTypes)
        throws NoSuchMethodException
    {
        return targetClass.getMethod(targetMethodName, parameterTypes);
    }

    public static Object tryToInvokeMethod(Object target, Method method)
    {
        return tryToInvokeMethod(target, method, null);
    }

    public static Object tryToInvokeMethodOfClass(Class target, Method method)
    {
        return tryToInvokeMethodOfClass(target, method, null);
    }

    public static Object tryToInvokeMethodOfClassAndMethodName(String className, String methodName)
    {
        return tryToInvokeMethodOfClassAndMethodName(className, methodName, null);
    }

    public static Object tryToInvokeMethodOfClassAndMethodName(String className, String methodName, Object[] args)
    {
        Class[] targetArgs = new Class[0];

        if(args != null)
        {
            targetArgs = new Class[args.length];

            for(int i = 0; i < args.length; i++)
            {
                targetArgs[i] = args[i].getClass();
            }
        }

        return tryToInvokeMethodOfClassAndMethodName(className, methodName, args, targetArgs);
    }

    public static Object tryToInvokeMethodOfClassAndMethodName(String className, String methodName,
                                                               Object[] args, Class[] argTypes)
    {
        Class targetClass = ClassUtils.tryToLoadClassForName(className);
        Method targetMethod = tryToGetMethod(targetClass, methodName, argTypes);
        return tryToInvokeMethodOfClass(targetClass, targetMethod, args);
    }

    public static Object tryToInvokeMethodOfClass(Class target, Method method, Object[] args)
    {
        try
        {
            return invokeMethodOfClass(target, method, args);
        }
        catch (Throwable e)
        {
            //do nothing - it's just a try
            return null;
        }
    }

    public static Object invokeMethodOfClass(Class target, Method method)
        throws IllegalAccessException, InstantiationException, InvocationTargetException
    {
        return invokeMethod(target.newInstance(), method, null);
    }

    public static Object invokeMethodOfClass(Class target, Method method, Object[] args)
        throws IllegalAccessException, InstantiationException, InvocationTargetException
    {
        return invokeMethod(target.newInstance(), method, args);
    }

    public static Object tryToInvokeMethod(Object target, Method method, Object[] args)
    {
        try
        {
            return method.invoke(target, args);
        }
        catch (Throwable t)
        {
            //do nothing - it's just a try
            return null;
        }
    }

    public static Object invokeMethod(Object target, Method method)
        throws InvocationTargetException, IllegalAccessException
    {
        return invokeMethod(target, method, null);
    }

    public static Object invokeMethod(Object target, Method method, Object[] args)
        throws InvocationTargetException, IllegalAccessException
    {
        return method.invoke(target, args);
    }
}