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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * 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 br.com.anteros.bean.validation.util;


import java.lang.annotation.ElementType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedAction;

import br.com.anteros.core.metadata.beans.Introspector;

/**
 * Description: invoke a zero-argument method (getter)

 */
public class MethodAccess extends AccessStrategy {
	private final Method method;
	private final String propertyName;

	/**
	 * Create a new MethodAccess instance.
	 * 
	 * @param method
	 */
	public MethodAccess(Method method) {
		this(getPropertyName(method), method);
	}

	/**
	 * Create a new MethodAccess instance.
	 * 
	 * @param propertyName
	 * @param method
	 */
	public MethodAccess(String propertyName, final Method method) {
		this.method = method;
		this.propertyName = propertyName;
		if (!method.isAccessible()) {
			run(new PrivilegedAction() {
				public Void run() {
					method.setAccessible(true);
					return null;
				}
			});
		}
	}

	/**
	 * Process bean properties getter by applying the JavaBean naming
	 * conventions.
	 *
	 * @param member
	 *            the member for which to get the property name.
	 * @return The bean method name with the "is" or "get" prefix stripped off,
	 *         null the method name id not according to the
	 *         JavaBeans standard.
	 */
	public static String getPropertyName(Method member) {
		String name = null;
		String methodName = member.getName();
		if (methodName.startsWith("is")) {
			name = Introspector.decapitalize(methodName.substring(2));
		} else if (methodName.startsWith("get")) {
			name = Introspector.decapitalize(methodName.substring(3));
		}
		return name;
	}

	/**
	 * {@inheritDoc} normally the propertyName of the getter method, e.g.

	 * method: getName() -> propertyName: name

	 * method: isValid() -> propertyName: valid

	 */
	public String getPropertyName() {
		return propertyName;
	}

	/**
	 * {@inheritDoc}
	 */
	public Object get(final Object instance) {
		try {
			return method.invoke(instance);
		} catch (IllegalAccessException e) {
			throw new IllegalArgumentException(e);
		} catch (InvocationTargetException e) {
			throw new IllegalArgumentException(e);
		}
	}

	/**
	 * {@inheritDoc}
	 */
	public ElementType getElementType() {
		return ElementType.METHOD;
	}

	/**
	 * {@inheritDoc}
	 */
	public Type getJavaType() {
		return method.getGenericReturnType();
	}

	/**
	 * {@inheritDoc}
	 */
	public String toString() {
		return method.toString();
	}

	/**
	 * {@inheritDoc}
	 */
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;

		MethodAccess that = (MethodAccess) o;

		return method.equals(that.method);
	}

	/**
	 * {@inheritDoc}
	 */
	public int hashCode() {
		return method.hashCode();
	}

	private static  T run(PrivilegedAction action) {
		if (System.getSecurityManager() != null) {
			return AccessController.doPrivileged(action);
		} else {
			return action.run();
		}
	}

	public Method getMethod() {
		return method;
	}
}