Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat, Inc. and/or its affiliates, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.hibernate.validator.internal.engine.resolver;
import java.lang.annotation.ElementType;
import java.lang.reflect.Method;
import javax.validation.Path;
import javax.validation.TraversableResolver;
import javax.validation.ValidationException;
import org.hibernate.validator.internal.util.ReflectionHelper;
import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;
/**
* A JPA 2 aware {@code TraversableResolver}.
*
* @author Emmanuel Bernard
* @author Hardy Ferentschik
*/
public class DefaultTraversableResolver implements TraversableResolver {
private static final Log log = LoggerFactory.make();
/**
* Class to load to check whether JPA is on the classpath.
*/
private static final String PERSISTENCE_CLASS_NAME = "javax.persistence.Persistence";
/**
* Method to check whether the found {@code Persistence} class is of the version 2
*/
private static final String PERSISTENCE_UTIL_METHOD = "getPersistenceUtil";
/**
* Class to instantiate in case JPA 2 is on the classpath.
*/
private static final String JPA_AWARE_TRAVERSABLE_RESOLVER_CLASS_NAME = "org.hibernate.validator.internal.engine.resolver.JPATraversableResolver";
/**
* A JPA 2 aware traversable resolver.
*/
private TraversableResolver jpaTraversableResolver;
public DefaultTraversableResolver() {
detectJPA();
}
/**
* Tries to load detect and load JPA.
*/
private void detectJPA() {
// check whether we have Persistence on the classpath
Class persistenceClass;
try {
persistenceClass = ReflectionHelper.loadClass( PERSISTENCE_CLASS_NAME, this.getClass() );
}
catch ( ValidationException e ) {
log.debugf(
"Cannot find %s on classpath. Assuming non JPA 2 environment. All properties will per default be traversable.",
PERSISTENCE_CLASS_NAME
);
return;
}
// check whether Persistence contains getPersistenceUtil
Method persistenceUtilGetter = ReflectionHelper.getMethod( persistenceClass, PERSISTENCE_UTIL_METHOD );
if ( persistenceUtilGetter == null ) {
log.debugf(
"Found %s on classpath, but no method '%s'. Assuming JPA 1 environment. All properties will per default be traversable.",
PERSISTENCE_CLASS_NAME,
PERSISTENCE_UTIL_METHOD
);
return;
}
// try to invoke the method to make sure that we are dealing with a complete JPA2 implementation
// unfortunately there are several incomplete implementations out there (see HV-374)
try {
Object persistence = ReflectionHelper.newInstance( persistenceClass, "persistence provider" );
ReflectionHelper.getValue(persistenceUtilGetter, persistence );
}
catch ( Exception e ) {
log.debugf(
"Unable to invoke %s.%s. Inconsistent JPA environment. All properties will per default be traversable.",
PERSISTENCE_CLASS_NAME,
PERSISTENCE_UTIL_METHOD
);
}
log.debugf(
"Found %s on classpath containing '%s'. Assuming JPA 2 environment. Trying to instantiate JPA aware TraversableResolver",
PERSISTENCE_CLASS_NAME,
PERSISTENCE_UTIL_METHOD
);
try {
@SuppressWarnings("unchecked")
Class jpaAwareResolverClass = (Class)
ReflectionHelper.loadClass( JPA_AWARE_TRAVERSABLE_RESOLVER_CLASS_NAME, this.getClass() );
jpaTraversableResolver = ReflectionHelper.newInstance( jpaAwareResolverClass, "" );
log.debugf(
"Instantiated JPA aware TraversableResolver of type %s.", JPA_AWARE_TRAVERSABLE_RESOLVER_CLASS_NAME
);
}
catch ( ValidationException e ) {
log.debugf(
"Unable to load or instantiate JPA aware resolver %s. All properties will per default be traversable.",
JPA_AWARE_TRAVERSABLE_RESOLVER_CLASS_NAME
);
}
}
public boolean isReachable(Object traversableObject, Path.Node traversableProperty, Class rootBeanType, Path pathToTraversableObject, ElementType elementType) {
return jpaTraversableResolver == null || jpaTraversableResolver.isReachable(
traversableObject, traversableProperty, rootBeanType, pathToTraversableObject, elementType
);
}
public boolean isCascadable(Object traversableObject, Path.Node traversableProperty, Class rootBeanType, Path pathToTraversableObject, ElementType elementType) {
return jpaTraversableResolver == null || jpaTraversableResolver.isCascadable(
traversableObject, traversableProperty, rootBeanType, pathToTraversableObject, elementType
);
}
}