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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * Licensed 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.
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.implementation.reflection.jdk;

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

import org.fabric3.api.host.Fabric3Exception;
import org.fabric3.implementation.pojo.spi.reflection.LifecycleInvoker;

/**
 * Performs an invocation on a method of a given instance
 */
public class MethodLifecycleInvoker implements LifecycleInvoker {
    private Method method;

    /**
     * Instantiates an invoker for the given method.
     *
     * @param method the method to invoke on
     */
    public MethodLifecycleInvoker(Method method) {
        assert method != null;
        this.method = method;
        this.method.setAccessible(true);
    }

    public void invoke(Object instance) {
        try {
            method.invoke(instance);
        } catch (IllegalArgumentException e) {
            String signature = getSignature();
            throw new Fabric3Exception("Invalid arguments provided when invoking method: " + signature, e.getCause());
        } catch (IllegalAccessException e) {
            String signature = getSignature();
            throw new Fabric3Exception("Method is not accessible: " + signature);
        } catch (InvocationTargetException e) {
            String signature = getSignature();
            throw new Fabric3Exception("Exception thrown when invoking method: " + signature, e.getCause());
        }
    }

    private String getSignature() {
        String name = method.getName();
        return method.getDeclaringClass().getName() + "." + name + "()";
    }

}