01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing,
13: * software distributed under the License is distributed on an
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15: * KIND, either express or implied. See the License for the
16: * specific language governing permissions and limitations
17: * under the License.
18: */
19: package org.apache.openjpa.persistence.fields;
20:
21: import java.util.EnumSet;
22: import java.util.Collections;
23: import java.util.Set;
24: import javax.persistence.Id;
25: import javax.persistence.Version;
26: import javax.persistence.Entity;
27:
28: import org.apache.openjpa.persistence.Persistent;
29: import org.apache.openjpa.persistence.Externalizer;
30:
31: @Entity
32: public class EnumSetOwner {
33:
34: @Id
35: private int id;
36:
37: @Version
38: private int version;
39:
40: @Persistent
41: @Externalizer("externalizer")
42: private EnumSetHolder enumSetHolder;
43:
44: public Set<SampleEnum> getEnumSet() {
45: return Collections.unmodifiableSet(enumSetHolder.enumSet);
46: }
47:
48: public void setEnumSet(EnumSet<SampleEnum> enumSet) {
49: enumSetHolder = new EnumSetHolder(enumSet);
50: }
51:
52: public static class EnumSetHolder {
53:
54: private final EnumSet<SampleEnum> enumSet;
55:
56: public EnumSetHolder(String externalizedValue) {
57: // this implementation can only handle the special form created
58: // by the externalizer above
59: if (!"all".equals(externalizedValue))
60: throw new IllegalStateException(externalizedValue);
61:
62: enumSet = EnumSet.allOf(SampleEnum.class);
63: }
64:
65: private EnumSetHolder(EnumSet<SampleEnum> enumSet) {
66: this .enumSet = enumSet;
67: }
68:
69: public String externalizer() {
70: // this implementation always externalizes to a special
71: // representation of all the values.
72: return "all";
73: }
74: }
75: }
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