/*
 * 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.bval.jsr303.resolver;

import javax.persistence.Persistence;
import javax.validation.Path;
import javax.validation.TraversableResolver;
import java.lang.annotation.ElementType;


/** @see javax.validation.TraversableResolver */
public class JPATraversableResolver implements TraversableResolver, CachingRelevant {

    /**
     * {@inheritDoc}
     */
    public boolean isReachable(Object traversableObject, Path.Node traversableProperty,
                               Class<?> rootBeanType, Path pathToTraversableObject,
                               ElementType elementType) {
        return traversableObject == null || Persistence.getPersistenceUtil()
              .isLoaded(traversableObject, traversableProperty.getName());
    }

    /**
     * {@inheritDoc}
     */
    public boolean isCascadable(Object traversableObject, Path.Node traversableProperty,
                                Class<?> rootBeanType, Path pathToTraversableObject,
                                ElementType elementType) {
        return true;
    }

    /**
     * {@inheritDoc}
     */
    public boolean needsCaching() {
        return true; // yes
    }
}