/*
    * 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 org.apache.hadoop.hbase.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;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  
  @InterfaceAudience.Private
  public class Methods {
    private static final 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;
      }
    }
  }