hbase-common/src/main/java/org/apache/hadoop/hbase/util/Methods.java

   1 /*
   2  * Copyright The Apache Software Foundation
   3  *
   4  * Licensed to the Apache Software Foundation (ASF) under one
   5  * or more contributor license agreements.  See the NOTICE file
   6  * distributed with this work for additional information
   7  * regarding copyright ownership.  The ASF licenses this file
   8  * to you under the Apache License, Version 2.0 (the
   9  * "License"); you may not use this file except in compliance
  10  * with the License.  You may obtain a copy of the License at
  11  *
  12  *     http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 package org.apache.hadoop.hbase.util;
  21
  22 import java.lang.reflect.InvocationTargetException;
  23 import java.lang.reflect.Method;
  24 import java.lang.reflect.UndeclaredThrowableException;
  25
  26 import org.apache.hadoop.hbase.log.HBaseMarkers;
  27 import org.apache.yetus.audience.InterfaceAudience;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 @InterfaceAudience.Private
  32 public final class Methods {
  33   private static final Logger LOG = LoggerFactory.getLogger(Methods.class);
  34
  35   private Methods() {
  36   }
  37
  38   public static <T> Object call(Class<T> clazz, T instance, String methodName,
  39       Class[] types, Object[] args) throws Exception {
  40     try {
  41       Method m = clazz.getMethod(methodName, types);
  42       return m.invoke(instance, args);
  43     } catch (IllegalArgumentException arge) {
  44       LOG.error(HBaseMarkers.FATAL, "Constructed invalid call. class="+clazz.getName()+
  45           " method=" + methodName + " types=" + Classes.stringify(types), arge);
  46       throw arge;
  47     } catch (NoSuchMethodException nsme) {
  48       throw new IllegalArgumentException(
  49           "Can't find method "+methodName+" in "+clazz.getName()+"!", nsme);
  50     } catch (InvocationTargetException ite) {
  51       // unwrap the underlying exception and rethrow
  52       if (ite.getTargetException() != null) {
  53         if (ite.getTargetException() instanceof Exception) {
  54           throw (Exception)ite.getTargetException();
  55         } else if (ite.getTargetException() instanceof Error) {
  56           throw (Error)ite.getTargetException();
  57         }
  58       }
  59       throw new UndeclaredThrowableException(ite,
  60           "Unknown exception invoking "+clazz.getName()+"."+methodName+"()");
  61     } catch (IllegalAccessException iae) {
  62       throw new IllegalArgumentException(
  63           "Denied access calling "+clazz.getName()+"."+methodName+"()", iae);
  64     } catch (SecurityException se) {
  65       LOG.error(HBaseMarkers.FATAL, "SecurityException calling method. class="+
  66           clazz.getName()+" method=" + methodName + " types=" +
  67           Classes.stringify(types), se);
  68       throw se;
  69     }
  70   }
  71 }