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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 | import org.hibernate.type.VersionType; |
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| 32 | |||
| 33 | /** |
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| 34 | * Represents a replication strategy. |
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| 35 | * |
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| 36 | * @see Session#replicate(Object, ReplicationMode) |
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| 37 | * @author Gavin King |
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| 38 | */ |
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| 39 | public abstract class ReplicationMode implements Serializable { |
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| 40 | private final String name; |
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| 41 | private static final Map INSTANCES = new HashMap(); |
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| 42 | |||
| 43 | public ReplicationMode(String name) { |
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| 44 | this.name=name; |
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| 45 | } |
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| 46 | public String toString() { |
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| 47 | return name; |
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| 48 | } |
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| 49 | public abstract boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType); |
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| 50 | /** |
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| 51 | * Throw an exception when a row already exists. |
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| 52 | */ |
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| 53 | public static final ReplicationMode EXCEPTION = new ReplicationMode("EXCEPTION") { |
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| 54 | public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) { |
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| 55 | throw new AssertionFailure("should not be called"); |
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| 56 | } |
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| 57 | }; |
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| 58 | /** |
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| 59 | * Ignore replicated entities when a row already exists. |
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| 60 | */ |
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| 61 | public static final ReplicationMode IGNORE = new ReplicationMode("IGNORE") { |
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| 62 | public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) { |
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| 63 | return false; |
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| 64 | } |
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| 65 | }; |
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| 66 | /** |
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| 67 | * Overwrite existing rows when a row already exists. |
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| 68 | */ |
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| 69 | public static final ReplicationMode OVERWRITE = new ReplicationMode("OVERWRITE") { |
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| 70 | public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) { |
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| 71 | return true; |
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| 72 | } |
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| 73 | }; |
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| 74 | /** |
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| 75 | * When a row already exists, choose the latest version. |
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| 76 | */ |
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| 77 | public static final ReplicationMode LATEST_VERSION = new ReplicationMode("LATEST_VERSION") { |
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| 78 | public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) { |
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| 79 | if (versionType==null) return true; //always overwrite nonversioned data |
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| 80 | return versionType.getComparator().compare(currentVersion, newVersion) <= 0; |
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| 81 | } |
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| 82 | }; |
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| 83 | |||
| 84 | static { |
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| 85 | INSTANCES.put( LATEST_VERSION.name, LATEST_VERSION ); |
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| 86 | INSTANCES.put( IGNORE.name, IGNORE ); |
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| 87 | INSTANCES.put( OVERWRITE.name, OVERWRITE ); |
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| 88 | INSTANCES.put( EXCEPTION.name, EXCEPTION ); |
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| 89 | } |
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| 90 | |||
| 91 | private Object readResolve() { |
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| 92 | return INSTANCES.get(name); |
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| 93 | } |
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| 94 | |||
| 95 | } |
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| 96 | |||
| 97 | |||
| 98 | |||
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| 101 |