001/*
002 * Copyright The Apache Software Foundation
003 *
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020package org.apache.hadoop.hbase.util;
021
022import java.lang.reflect.InvocationTargetException;
023import java.lang.reflect.Method;
024import java.lang.reflect.UndeclaredThrowableException;
025
026import org.apache.hadoop.hbase.log.HBaseMarkers;
027import org.apache.yetus.audience.InterfaceAudience;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030
031@InterfaceAudience.Private
032public final class Methods {
033  private static final Logger LOG = LoggerFactory.getLogger(Methods.class);
034
035  private Methods() {
036  }
037
038  public static <T> Object call(Class<T> clazz, T instance, String methodName,
039      Class[] types, Object[] args) throws Exception {
040    try {
041      Method m = clazz.getMethod(methodName, types);
042      return m.invoke(instance, args);
043    } catch (IllegalArgumentException arge) {
044      LOG.error(HBaseMarkers.FATAL, "Constructed invalid call. class="+clazz.getName()+
045          " method=" + methodName + " types=" + Classes.stringify(types), arge);
046      throw arge;
047    } catch (NoSuchMethodException nsme) {
048      throw new IllegalArgumentException(
049          "Can't find method "+methodName+" in "+clazz.getName()+"!", nsme);
050    } catch (InvocationTargetException ite) {
051      // unwrap the underlying exception and rethrow
052      if (ite.getTargetException() != null) {
053        if (ite.getTargetException() instanceof Exception) {
054          throw (Exception)ite.getTargetException();
055        } else if (ite.getTargetException() instanceof Error) {
056          throw (Error)ite.getTargetException();
057        }
058      }
059      throw new UndeclaredThrowableException(ite,
060          "Unknown exception invoking "+clazz.getName()+"."+methodName+"()");
061    } catch (IllegalAccessException iae) {
062      throw new IllegalArgumentException(
063          "Denied access calling "+clazz.getName()+"."+methodName+"()", iae);
064    } catch (SecurityException se) {
065      LOG.error(HBaseMarkers.FATAL, "SecurityException calling method. class="+
066          clazz.getName()+" method=" + methodName + " types=" +
067          Classes.stringify(types), se);
068      throw se;
069    }
070  }
071}