View as "text/plain" |
Blame |
Last modification |
View Log
| RSS feed
1
/*
* 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;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/**
* Represents an association fetching strategy. This is used
* together with the <tt>Criteria</tt> API to specify runtime
* fetching strategies.<br>
* <br>
* For HQL queries, use the <tt>FETCH</tt> keyword instead.
*
* @see Criteria#setFetchMode(java.lang.String, FetchMode)
* @author Gavin King
*/
public final class FetchMode
implements Serializable {
private final String name
;
private static final Map INSTANCES =
new HashMap();
private FetchMode
(String name
) {
this.
name=name
;
}
public String toString
() {
return name
;
}
/**
* Default to the setting configured in the mapping file.
*/
public static final FetchMode DEFAULT =
new FetchMode
("DEFAULT");
/**
* Fetch using an outer join. Equivalent to <tt>fetch="join"</tt>.
*/
public static final FetchMode JOIN =
new FetchMode
("JOIN");
/**
* Fetch eagerly, using a separate select. Equivalent to
* <tt>fetch="select"</tt>.
*/
public static final FetchMode SELECT =
new FetchMode
("SELECT");
/**
* Fetch lazily. Equivalent to <tt>outer-join="false"</tt>.
* @deprecated use <tt>FetchMode.SELECT</tt>
*/
public static final FetchMode LAZY = SELECT
;
/**
* Fetch eagerly, using an outer join. Equivalent to
* <tt>outer-join="true"</tt>.
* @deprecated use <tt>FetchMode.JOIN</tt>
*/
public static final FetchMode EAGER = JOIN
;
static {
INSTANCES.
put( JOIN.
name, JOIN
);
INSTANCES.
put( SELECT.
name, SELECT
);
INSTANCES.
put( DEFAULT.
name, DEFAULT
);
}
private Object readResolve
() {
return INSTANCES.
get(name
);
}
}