/*
* 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.deltaspike.jpa.spi.descriptor.xml;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import javax.enterprise.inject.Typed;
import org.apache.deltaspike.core.util.StringUtils;
@Typed
public final class PersistenceUnitDescriptorProvider
{
private static final PersistenceUnitDescriptorProvider INSTANCE = new PersistenceUnitDescriptorProvider();
private final PersistenceUnitDescriptorParser persistenceUnitDescriptorParser
= new PersistenceUnitDescriptorParser();
private List<PersistenceUnitDescriptor> persistenceUnitDescriptors = Collections.emptyList();
private PersistenceUnitDescriptorProvider()
{
}
public static PersistenceUnitDescriptorProvider getInstance()
{
return INSTANCE;
}
public void init()
{
try
{
persistenceUnitDescriptors = persistenceUnitDescriptorParser.readAll();
}
catch (IOException e)
{
throw new RuntimeException("Failed to parse persitence.xml's", e);
}
}
public PersistenceUnitDescriptor get(String name)
{
for (PersistenceUnitDescriptor unit : persistenceUnitDescriptors)
{
if (name.equalsIgnoreCase(unit.getName()))
{
return unit;
}
}
return null;
}
public boolean isEntity(Class<?> entityClass)
{
return find(entityClass) != null;
}
public String[] primaryKeyFields(Class<?> entityClass)
{
EntityDescriptor entity = find(entityClass);
if (entity != null)
{
if (entity.getId() != null)
{
return entity.getId();
}
AbstractEntityDescriptor parent = entity.getParent();
while (parent != null)
{
if (parent.getId() != null)
{
return parent.getId();
}
parent = parent.getParent();
}
}
return null;
}
public String versionField(Class<?> entityClass)
{
EntityDescriptor entity = find(entityClass);
if (entity != null)
{
if (!StringUtils.isEmpty(entity.getVersion()))
{
return entity.getVersion();
}
AbstractEntityDescriptor parent = entity.getParent();
while (parent != null)
{
if (!StringUtils.isEmpty(parent.getVersion()))
{
return parent.getVersion();
}
parent = parent.getParent();
}
}
return null;
}
public Class<?> primaryKeyIdClass(Class<?> entityClass)
{
EntityDescriptor entity = find(entityClass);
if (entity != null)
{
if (entity.getIdClass() != null)
{
return entity.getIdClass();
}
AbstractEntityDescriptor parent = entity.getParent();
while (parent != null)
{
if (parent.getIdClass() != null)
{
return parent.getIdClass();
}
parent = parent.getParent();
}
}
return null;
}
public String entityName(Class<?> entityClass)
{
EntityDescriptor entity = find(entityClass);
if (entity != null)
{
return entity.getName();
}
return null;
}
public String entityTableName(Class<?> entityClass)
{
EntityDescriptor entity = find(entityClass);
if (entity != null)
{
return entity.getTableName();
}
return null;
}
public EntityDescriptor find(Class<?> entityClass)
{
for (PersistenceUnitDescriptor unit : persistenceUnitDescriptors)
{
EntityDescriptor entity = find(entityClass, unit);
if (entity != null)
{
return entity;
}
}
return null;
}
protected EntityDescriptor find(Class<?> entityClass, PersistenceUnitDescriptor descriptor)
{
for (EntityDescriptor entity : descriptor.getEntityDescriptors())
{
if (entity.getEntityClass().equals(entityClass))
{
return entity;
}
}
return null;
}
}