org.apache.deltaspike.core.impl.jmx.AttributeAccessor Maven / Gradle / Ivy

/*
 * 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.deltaspike.core.impl.jmx;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Just a helper class mapping a JMX attribute.
 * It make the link between the attribute and its accessors validating
 * operations (read/write) are possible.
 */
public class AttributeAccessor
{
    private final Method getter;
    private final Method setter;

    public AttributeAccessor(final Method get, final Method set)
    {
        this.setter = set;
        this.getter = get;
    }

    public Object get(final Object instance) throws InvocationTargetException, IllegalAccessException
    {
        if (getter == null)
        {
            throw new IllegalAccessException("This attribute has no getter");
        }
        return getter.invoke(instance);
    }

    public void set(final Object instance, final Object value) throws InvocationTargetException, IllegalAccessException
    {
        if (setter == null)
        {
            throw new IllegalAccessException("This attribute has no setter");
        }
        setter.invoke(instance, value);
    }
}