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| 33 | PointedEar | 1 | /* |
| 2 | * Hibernate, Relational Persistence for Idiomatic Java |
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| 3 | * |
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| 4 | * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as |
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| 5 | * indicated by the @author tags or express copyright attribution |
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| 6 | * statements applied by the authors. All third-party contributions are |
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| 7 | * distributed under license by Red Hat Middleware LLC. |
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| 8 | * |
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| 9 | * This copyrighted material is made available to anyone wishing to use, modify, |
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| 10 | * copy, or redistribute it subject to the terms and conditions of the GNU |
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| 11 | * Lesser General Public License, as published by the Free Software Foundation. |
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| 12 | * |
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| 13 | * This program is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 15 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License |
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| 16 | * for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public License |
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| 19 | * along with this distribution; if not, write to: |
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| 20 | * Free Software Foundation, Inc. |
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| 21 | * 51 Franklin Street, Fifth Floor |
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| 22 | * Boston, MA 02110-1301 USA |
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| 23 | * |
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| 24 | */ |
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| 25 | package org.hibernate; |
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| 26 | |||
| 27 | import java.io.Serializable; |
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| 28 | import java.util.HashMap; |
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| 29 | import java.util.Map; |
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| 30 | |||
| 31 | /** |
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| 32 | * Represents an association fetching strategy. This is used |
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| 33 | * together with the <tt>Criteria</tt> API to specify runtime |
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| 34 | * fetching strategies.<br> |
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| 35 | * <br> |
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| 36 | * For HQL queries, use the <tt>FETCH</tt> keyword instead. |
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| 37 | * |
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| 38 | * @see Criteria#setFetchMode(java.lang.String, FetchMode) |
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| 39 | * @author Gavin King |
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| 40 | */ |
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| 41 | public final class FetchMode implements Serializable { |
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| 42 | private final String name; |
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| 43 | private static final Map INSTANCES = new HashMap(); |
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| 44 | |||
| 45 | private FetchMode(String name) { |
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| 46 | this.name=name; |
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| 47 | } |
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| 48 | public String toString() { |
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| 49 | return name; |
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| 50 | } |
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| 51 | /** |
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| 52 | * Default to the setting configured in the mapping file. |
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| 53 | */ |
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| 54 | public static final FetchMode DEFAULT = new FetchMode("DEFAULT"); |
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| 55 | |||
| 56 | /** |
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| 57 | * Fetch using an outer join. Equivalent to <tt>fetch="join"</tt>. |
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| 58 | */ |
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| 59 | public static final FetchMode JOIN = new FetchMode("JOIN"); |
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| 60 | /** |
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| 61 | * Fetch eagerly, using a separate select. Equivalent to |
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| 62 | * <tt>fetch="select"</tt>. |
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| 63 | */ |
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| 64 | public static final FetchMode SELECT = new FetchMode("SELECT"); |
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| 65 | |||
| 66 | /** |
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| 67 | * Fetch lazily. Equivalent to <tt>outer-join="false"</tt>. |
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| 68 | * @deprecated use <tt>FetchMode.SELECT</tt> |
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| 69 | */ |
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| 70 | public static final FetchMode LAZY = SELECT; |
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| 71 | /** |
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| 72 | * Fetch eagerly, using an outer join. Equivalent to |
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| 73 | * <tt>outer-join="true"</tt>. |
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| 74 | * @deprecated use <tt>FetchMode.JOIN</tt> |
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| 75 | */ |
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| 76 | public static final FetchMode EAGER = JOIN; |
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| 77 | |||
| 78 | static { |
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| 79 | INSTANCES.put( JOIN.name, JOIN ); |
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| 80 | INSTANCES.put( SELECT.name, SELECT ); |
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| 81 | INSTANCES.put( DEFAULT.name, DEFAULT ); |
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| 82 | } |
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| 83 | |||
| 84 | private Object readResolve() { |
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| 85 | return INSTANCES.get(name); |
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| 86 | } |
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| 87 | |||
| 88 | } |
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| 89 | |||
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| 93 |