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Anteros Persistence Core for Java.
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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.persistence.util;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import br.com.anteros.core.utils.ReflectionUtils;
import br.com.anteros.persistence.proxy.AnterosProxyObject;
import br.com.anteros.persistence.proxy.collection.AnterosPersistentCollection;

public class AnterosPersistenceHelper {
	private static Boolean androidPresent = null;

	private AnterosPersistenceHelper() {

	}

	public static boolean isLoaded(Object proxy, String property) {
		if (proxy == null)
			return true;
		Field field = ReflectionUtils.getFieldByName(proxy.getClass(), property);
		Object value;
		try {
			value = ReflectionUtils.getFieldValue(proxy, field);
		} catch (Exception e) {
			return true;
		}
		if (value == null)
			return true;

		if (AnterosProxyObject.class.isAssignableFrom(value.getClass())) {
			Class javassistClass = null;
			try {
				javassistClass = Class.forName("br.com.anteros.persistence.proxy.JavassistLazyLoadInterceptor");
			} catch (ClassNotFoundException e1) {
				return true;
			}

			Method getHandlerMethod = ReflectionUtils.getAccessibleMethod(value.getClass(), "getHandler", new Class[] {});
			if (getHandlerMethod == null)
				return true;

			try {
				Object result = getHandlerMethod.invoke(value, "getHandler", new Object[] {});
				if (result == null)
					return true;

				if (!(ReflectionUtils.isExtendsClass(javassistClass, result.getClass())))
					return true;

				Method isInitializedMethod = ReflectionUtils.getAccessibleMethod(result.getClass(), "isInitialized", new Class[] {});
				Object isInitialized = isInitializedMethod.invoke(result, new Object[] {});
				return ((Boolean) isInitialized);

			} catch (Exception e) {
				return true;
			}

//			MethodHandler handler = ((ProxyObject) value).getHandler();
//			if (!(handler instanceof JavassistLazyLoadInterceptor))
//				return true;
//
//			return ((JavassistLazyLoadInterceptor) (handler)).isInitialized();

		} else if (value instanceof AnterosPersistentCollection) {
			AnterosPersistentCollection coll = (AnterosPersistentCollection) value;
			return coll.isInitialized();
		}
		return true;
	}

	public static boolean androidIsPresent() {
		if (androidPresent == null) {
			try {
				Class.forName("br.com.anteros.android.persistence.session.AndroidSQLSession");
				androidPresent = true;
			} catch (ClassNotFoundException e) {
				androidPresent = false;
			}
		}
		return androidPresent;
	}
}