org.elasticsearch.hadoop.mr.compat.ReflectiveInvoker Maven / Gradle / Ivy
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.hadoop.mr.compat;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import org.elasticsearch.hadoop.util.Assert;
import org.elasticsearch.hadoop.util.ReflectionUtils;
public class ReflectiveInvoker implements InvocationHandler {
private final Object target;
public ReflectiveInvoker(Object target) {
this.target = target;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Method m = ReflectionUtils.findMethod(target.getClass(), method.getName(), method.getParameterTypes());
// toString on target seems to lead to weird effects to use the class name instead
Assert.notNull(m, String.format("Cannot find method %s on target %s", method, target.getClass()));
return m.invoke(target, args);
}
public Object target() {
return target;
}
}