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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 | |||
99 | |||
100 | |||
101 |