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

/*
 * 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.hadoop.hbase.log.HBaseMarkers;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@InterfaceAudience.Private
public final class Methods {
  private static final Logger LOG = LoggerFactory.getLogger(Methods.class);

  private Methods() {
  }

  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.error(HBaseMarkers.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.error(HBaseMarkers.FATAL, "SecurityException calling method. class=" + clazz.getName()
        + " method=" + methodName + " types=" + Classes.stringify(types), se);
      throw se;
    }
  }
}