/*
* Copyright 2014, Timo Westkämper
*
* 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 com.mysema.query.jpa.support;
import javax.persistence.EntityManager;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.Metamodel;
import javax.persistence.metamodel.PluralAttribute;
import com.google.common.primitives.Primitives;
import com.mysema.query.types.path.PathBuilderValidator;
/**
* JPAPathBuilderValidator implements PathBuilderValidator using a JPA Metamodel instance
*/
public class JPAPathBuilderValidator implements PathBuilderValidator {
private final Metamodel metamodel;
public JPAPathBuilderValidator(EntityManager entityManager) {
this.metamodel = entityManager.getMetamodel();
}
public JPAPathBuilderValidator(Metamodel metamodel) {
this.metamodel = metamodel;
}
@Override
public Class<?> validate(Class<?> parent, String property, Class<?> propertyType) {
try {
ManagedType managedType = metamodel.managedType(parent);
Attribute attribute = managedType.getAttribute(property);
if (attribute instanceof PluralAttribute) {
return ((PluralAttribute)attribute).getElementType().getJavaType();
} else {
return Primitives.wrap(attribute.getJavaType());
}
} catch (IllegalArgumentException e) {
return null;
}
}
}