com.ery.ertc.estorm.util.Methods.java Source code

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Here is the source code for com.ery.ertc.estorm.util.Methods.java

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/*
 * Copyright The Apache Software Foundation
 *
 * 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 com.ery.ertc.estorm.util;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Methods {
    private static Log LOG = LogFactory.getLog(Methods.class);

    public static <T> Object call(Class<T> clazz, T instance, String methodName, Class[] types, Object[] args)
            throws Exception {
        try {
            Method m = clazz.getMethod(methodName, types);
            return m.invoke(instance, args);
        } catch (IllegalArgumentException arge) {
            LOG.fatal("Constructed invalid call. class=" + clazz.getName() + " method=" + methodName + " types="
                    + Classes.stringify(types), arge);
            throw arge;
        } catch (NoSuchMethodException nsme) {
            throw new IllegalArgumentException("Can't find method " + methodName + " in " + clazz.getName() + "!",
                    nsme);
        } catch (InvocationTargetException ite) {
            // unwrap the underlying exception and rethrow
            if (ite.getTargetException() != null) {
                if (ite.getTargetException() instanceof Exception) {
                    throw (Exception) ite.getTargetException();
                } else if (ite.getTargetException() instanceof Error) {
                    throw (Error) ite.getTargetException();
                }
            }
            throw new UndeclaredThrowableException(ite,
                    "Unknown exception invoking " + clazz.getName() + "." + methodName + "()");
        } catch (IllegalAccessException iae) {
            throw new IllegalArgumentException("Denied access calling " + clazz.getName() + "." + methodName + "()",
                    iae);
        } catch (SecurityException se) {
            LOG.fatal("SecurityException calling method. class=" + clazz.getName() + " method=" + methodName
                    + " types=" + Classes.stringify(types), se);
            throw se;
        }
    }
}