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Core services for Usergrid system.
/*******************************************************************************
* Copyright 2012 Apigee Corporation
*
* 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.usergrid.persistence;
import java.util.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A factory for creating Entity objects.
*/
public class EntityFactory {
/** The Constant logger. */
private static final Logger logger = LoggerFactory.getLogger(EntityFactory.class);
/**
* New entity.
*
* @param
* the generic type
* @param id
* the id
* @param type
* the type
* @param entityClass
* the entity class
* @return new entity
*/
public static A newEntity(UUID id, String type,
Class entityClass) {
if (type == null) {
String errorMsg = "Entity type cannot be null";
logger.error(errorMsg);
throw new IllegalArgumentException(errorMsg);
}
if ("entity".equalsIgnoreCase(type)
|| "dynamicentity".equalsIgnoreCase(type)) {
String errorMsg = "Unable to instantiate entity (" + type
+ ") because that is not a valid type.";
logger.error(errorMsg);
throw new IllegalArgumentException(errorMsg);
}
Class expectedCls = Schema.getDefaultSchema()
.getEntityClass(type);
if ((expectedCls != null)
&& !DynamicEntity.class.isAssignableFrom(entityClass)
&& !expectedCls.isAssignableFrom(entityClass)) {
String errorMsg = "Unable to instantiate entity ("
+ type
+ ") because type and entityClass do not match, either use DynamicClass as entityClass or fix mismatch.";
logger.error(errorMsg);
throw new IllegalArgumentException(errorMsg);
} else {
try {
A entity = entityClass.newInstance();
entity.setUuid(id);
entity.setType(type);
return entity;
} catch (IllegalAccessException e) {
String errorMsg = "Unable to access entity (" + type + "): "
+ e.getMessage();
logger.error(errorMsg);
} catch (InstantiationException e) {
String errorMsg = "Unable to instantiate entity (" + type
+ "): " + e.getMessage();
logger.error(errorMsg);
}
}
return null;
}
/**
* New entity.
*
* @param
* the generic type
* @param id
* the id
* @param entityClass
* the entity class
* @return new entity
*/
public static A newEntity(UUID id, Class entityClass) {
if (entityClass == DynamicEntity.class) {
return null;
}
String type = Schema.getDefaultSchema().getEntityType(entityClass);
return newEntity(id, type, entityClass);
}
/**
* New entity.
*
* @param id
* the id
* @param type
* the type
* @return new entity
*/
public static Entity newEntity(UUID id, String type) {
Class entityClass = Schema.getDefaultSchema()
.getEntityClass(type);
if (entityClass == null) {
entityClass = DynamicEntity.class;
}
return newEntity(id, type, entityClass);
}
}