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Cayenne Object Persistence Framework
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
****************************************************************/
package org.apache.cayenne.map;
/**
* Defines constants for the possible values of ObjRelationship delete rules.
*
* @author Craig Miskell
*/
public class DeleteRule {
public static final int NO_ACTION = 0;
private static final String NO_ACTION_NAME = "No Action";
/**
* Remove the reference that the destination has to this source (if the
* inverse relationship is toOne, nullify, if toMany, remove the source
* object)
*/
public static final int NULLIFY = 1;
private static final String NULLIFY_NAME = "Nullify";
/** Delete the destination object(s)
*/
public static final int CASCADE = 2;
private static final String CASCADE_NAME = "Cascade";
/** If the relationship has any objects (toOne or toMany), deny the delete.
* (Destination objects would therefore have to be deleted manually first)
*/
public static final int DENY = 3;
private static final String DENY_NAME = "Deny";
/**
* Returns String label for a delete rule state. Used for save/load (xml),
* display in modeler etc. Must remain the same, or else great care taken
* with loading old maps.
*/
public static String deleteRuleName(int deleteRule) {
switch (deleteRule) {
case DeleteRule.NULLIFY :
return NULLIFY_NAME;
case DeleteRule.CASCADE :
return CASCADE_NAME;
case DeleteRule.DENY :
return DENY_NAME;
default :
return NO_ACTION_NAME;
}
}
/**
* Translates a possible delete rule name (typically returned from
* deleteRuleName at some stage), into a deleteRule constant
*/
public static int deleteRuleForName(String name) {
if (DENY_NAME.equals(name)) {
return DENY;
} else if (CASCADE_NAME.equals(name)) {
return CASCADE;
} else if (NULLIFY_NAME.equals(name)) {
return NULLIFY;
}
return NO_ACTION;
}
}
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