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/*
 * Copyright 2012-2016 the original author or authors.
 *
 * 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.
 */

package fish.payara.micro.boot.loader;

import java.lang.reflect.Method;

/**
 * Utility class that is used by {@link Launcher}s to call a main method. The class
 * containing the main method is loaded using the thread context class loader.
 *
 * @author Phillip Webb
 * @author Andy Wilkinson
 */
public class MainMethodRunner {

	private final String mainClassName;
	private final String mainMethodName;
	private final String[] args;


	/**
	 * Create a new {@link MainMethodRunner} instance.
	 * @param mainClass the main class
	 * @param args incoming arguments
	 */
	public MainMethodRunner(String mainClass, String[] args, String mainMethodName) {
		this.mainClassName = mainClass;
        this.mainMethodName = mainMethodName;
		this.args = (args == null ? null : args.clone());
	}

	public Object run() throws Exception {
		Class mainClass = Thread.currentThread().getContextClassLoader()
				.loadClass(this.mainClassName);
		Method mainMethod = mainClass.getDeclaredMethod(mainMethodName, String[].class);
		return mainMethod.invoke(null, new Object[] { this.args });
	}

}