|
1
56 package org.objectstyle.cayenne.pref;
57
58 import java.io.ByteArrayInputStream  ;
59 import java.io.ByteArrayOutputStream ;
60 import java.io.IOException ;
61 import java.util.Properties ;
62
63 import org.objectstyle.cayenne.DataObjectUtils;
64 import org.objectstyle.cayenne.PersistenceState;
65 import org.objectstyle.cayenne.util.Util;
66
67
70 public class DomainPreference extends _DomainPreference {
71
72 protected DomainProperties properties;
73
74 protected Properties getProperties() {
75
76 if (properties == null) {
77 properties = new DomainProperties();
78
79 String values = getKeyValuePairs();
80 if (values != null && values.length() > 0) {
81 try {
82 properties.load(new ByteArrayInputStream (values.getBytes()));
83 }
84 catch (IOException ex) {
85 throw new PreferenceException("Error loading properties.", ex);
86 }
87 }
88 }
89
90 return properties;
91 }
92
93 protected void encodeProperties() {
94 if (this.properties == null) {
95 setKeyValuePairs(null);
96 }
97 else {
98 ByteArrayOutputStream out = new ByteArrayOutputStream ();
99
100 try {
101 properties.store(out, null);
102 }
103 catch (IOException ex) {
104 throw new PreferenceException("Error storing properties.", ex);
105 }
106
107 setKeyValuePairs(out.toString());
108 }
109 }
110
111
114 protected PreferenceDetail getPreference() {
115 PreferenceDetail preference = new PreferenceDetail();
116 preference.setDomainPreference(this);
117 return preference;
118 }
119
120
123 protected PreferenceDetail getPreference(Class javaClass, boolean create) {
124
125
127 int pk = DataObjectUtils.intPKForObject(this);
128 PreferenceDetail preference = (PreferenceDetail) DataObjectUtils
129 .objectForPK(getDataContext(), javaClass, pk);
130
131 if (preference != null) {
132 preference.setDomainPreference(this);
133 }
134
135 if (preference != null || !create) {
136 return preference;
137 }
138
139 preference = (PreferenceDetail) getDataContext()
140 .createAndRegisterNewObject(javaClass);
141
142 preference.setDomainPreference(this);
143 getDataContext().commitChanges();
144 return preference;
145 }
146
147
151 public void setPersistenceState(int state) {
152
153 if (state == PersistenceState.HOLLOW) {
155 properties = null;
156 }
157
158 super.setPersistenceState(state);
159 }
160
161 class DomainProperties extends Properties {
162
163 public Object setProperty(String key, String value) {
164 Object old = super.setProperty(key, value);
165 if (!Util.nullSafeEquals(old, value)) {
166 modified();
167 }
168
169 return old;
170 }
171
172 void modified() {
173 encodeProperties();
177 }
178 }
179
180 }
181
182 |
Popular Tags |
Java API By Example, From Geeks To Geeks.