/*
* 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
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* 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.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
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...
* <p/>
* 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<styles.length; i++) {
if ( styles[i].doCascade(action) ) return true;
}
return false;
}
public boolean reallyDoCascade(CascadingAction action) {
for (int i=0; i<styles.length; i++) {
if ( styles[i].reallyDoCascade(action) ) return true;
}
return false;
}
public boolean hasOrphanDelete() {
for (int i=0; i<styles.length; i++) {
if ( styles[i].hasOrphanDelete() ) return true;
}
return false;
}
public String toString() {
return ArrayHelper.toString(styles);
}
}
/**
* save / delete / update / evict / lock / replicate / merge / persist + delete orphans
*/
public static final CascadeStyle ALL_DELETE_ORPHAN = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return true;
}
public boolean hasOrphanDelete() {
return true;
}
public String toString() {
return "STYLE_ALL_DELETE_ORPHAN";
}
};
/**
* save / delete / update / evict / lock / replicate / merge / persist
*/
public static final CascadeStyle ALL = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return true;
}
public String toString() {
return "STYLE_ALL";
}
};
/**
* save / update
*/
public static final CascadeStyle UPDATE = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.SAVE_UPDATE || action==CascadingAction.SAVE_UPDATE_COPY;
}
public String toString() {
return "STYLE_SAVE_UPDATE";
}
};
/**
* lock
*/
public static final CascadeStyle LOCK = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.LOCK;
}
public String toString() {
return "STYLE_LOCK";
}
};
/**
* refresh
*/
public static final CascadeStyle REFRESH = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.REFRESH;
}
public String toString() {
return "STYLE_REFRESH";
}
};
/**
* evict
*/
public static final CascadeStyle EVICT = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.EVICT;
}
public String toString() {
return "STYLE_EVICT";
}
};
/**
* replicate
*/
public static final CascadeStyle REPLICATE = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.REPLICATE;
}
public String toString() {
return "STYLE_REPLICATE";
}
};
/**
* merge
*/
public static final CascadeStyle MERGE = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.MERGE;
}
public String toString() {
return "STYLE_MERGE";
}
};
/**
* create
*/
public static final CascadeStyle PERSIST = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.PERSIST
|| action==CascadingAction.PERSIST_ON_FLUSH;
}
public String toString() {
return "STYLE_PERSIST";
}
};
/**
* delete
*/
public static final CascadeStyle DELETE = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.DELETE;
}
public String toString() {
return "STYLE_DELETE";
}
};
/**
* delete + delete orphans
*/
public static final CascadeStyle DELETE_ORPHAN = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return action==CascadingAction.DELETE || action==CascadingAction.SAVE_UPDATE;
}
public boolean reallyDoCascade(CascadingAction action) {
return action==CascadingAction.DELETE;
}
public boolean hasOrphanDelete() {
return true;
}
public String toString() {
return "STYLE_DELETE_ORPHAN";
}
};
/**
* no cascades
*/
public static final CascadeStyle NONE = new CascadeStyle() {
public boolean doCascade(CascadingAction action) {
return false;
}
public String toString() {
return "STYLE_NONE";
}
};
/**
* package-protected constructor
*/
CascadeStyle() {
}
static final Map STYLES = new HashMap();
static {
STYLES.put( "all", ALL );
STYLES.put( "all-delete-orphan", ALL_DELETE_ORPHAN );
STYLES.put( "save-update", UPDATE );
STYLES.put( "persist", PERSIST );
STYLES.put( "merge", MERGE );
STYLES.put( "lock", LOCK );
STYLES.put( "refresh", REFRESH );
STYLES.put( "replicate", REPLICATE );
STYLES.put( "evict", EVICT );
STYLES.put( "delete", DELETE );
STYLES.put( "remove", DELETE ); // adds remove as a sort-of alias for delete...
STYLES.put( "delete-orphan", DELETE_ORPHAN );
STYLES.put( "none", NONE );
}
/**
* Factory method for obtaining named cascade styles
*
* @param cascade The named cascade style name.
* @return The appropriate CascadeStyle
*/
public static CascadeStyle getCascadeStyle(String cascade) {
CascadeStyle style = (CascadeStyle) STYLES.get(cascade);
if (style==null) {
throw new MappingException("Unsupported cascade style: " + cascade);
}
else {
return style;
}
}
}