org.hibernate.engine.CascadeStyle Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
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* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
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*/
package org.hibernate.engine;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import org.hibernate.MappingException;
import org.hibernate.util.ArrayHelper;
/**
* A contract for defining the aspects of cascading various persistence actions.
*
* @see CascadingAction
*
* @author Gavin King
*/
public abstract class CascadeStyle implements Serializable {
/**
* For this style, should the given action be cascaded?
*
* @param action The action to be checked for cascade-ability.
* @return True if the action should be cascaded under this style; false otherwise.
*/
public abstract boolean doCascade(CascadingAction action);
/**
* Probably more aptly named something like doCascadeToCollectionElements(); it is
* however used from both the collection and to-one logic branches...
*
* For this style, should the given action really be cascaded? The default
* implementation is simply to return {@link #doCascade}; for certain
* styles (currently only delete-orphan), however, we need to be able to
* control this seperately.
*
* @param action The action to be checked for cascade-ability.
* @return True if the action should be really cascaded under this style;
* false otherwise.
*/
public boolean reallyDoCascade(CascadingAction action) {
return doCascade(action);
}
/**
* Do we need to delete orphaned collection elements?
*
* @return True if this style need to account for orphan delete
* operations; false othwerwise.
*/
public boolean hasOrphanDelete() {
return false;
}
public static final class MultipleCascadeStyle extends CascadeStyle {
private final CascadeStyle[] styles;
public MultipleCascadeStyle(CascadeStyle[] styles) {
this.styles = styles;
}
public boolean doCascade(CascadingAction action) {
for (int i=0; i