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