/**
*
*/
package com.thinkbiganalytics.jpa;
/*-
* #%L
* thinkbig-commons-jpa
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* 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.
* #L%
*/
import java.lang.reflect.Constructor;
import java.security.Principal;
import javax.persistence.AttributeConverter;
/**
* Converts a principal to a string in the form: "<principal class name>:<principal name>".
* By default it assumes the principal class has a single-argument constructor rhat accepts
* the principal name. Subclass may override this assumption.
*/
public class PrincipalConverter implements AttributeConverter<Principal, String> {
/* (non-Javadoc)
* @see javax.persistence.AttributeConverter#convertToDatabaseColumn(java.lang.Object)
*/
@Override
public String convertToDatabaseColumn(Principal principal) {
String className = principal.getClass().getName();
return className + ":" + principal.getName();
}
/* (non-Javadoc)
* @see javax.persistence.AttributeConverter#convertToEntityAttribute(java.lang.Object)
*/
@Override
public Principal convertToEntityAttribute(String dbData) {
try {
int div = dbData.indexOf(':');
String className = dbData.substring(0, div);
String name = dbData.substring(div + 1, dbData.length());
@SuppressWarnings("unchecked")
Class<Principal> principalClass = (Class<Principal>) Class.forName(className);
Constructor<Principal> constructor = principalClass.getConstructor(String.class);
return constructor.newInstance(name);
} catch (RuntimeException x) {
throw x;
} catch (Exception x) {
throw new IllegalStateException("Failed to instantiate principal from: " + dbData, x);
}
}
}