org.elasticsearch.hadoop.mr.compat.ReflectiveInvoker Maven / Gradle / Ivy

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 * the Apache License, Version 2.0 (the "License"); you may
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 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
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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;
    }
}