Source Code Cross Referenced for Configurator.java in  » Net » SkunkDAV » org » skunk » config » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » SkunkDAV » org.skunk.config 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright (c) 2001, Jacob Smullyan.
003:         *
004:         *  This is part of SkunkDAV, a WebDAV client.  See http://skunkdav.sourceforge.net/ 
005:         *  for the latest version.
006:         * 
007:         *  SkunkDAV is free software; you can redistribute it and/or
008:         *  modify it under the terms of the GNU General Public License as published
009:         *  by the Free Software Foundation; either version 2, or (at your option)
010:         *  any later version.
011:         * 
012:         *  SkunkDAV is distributed in the hope that it will be useful,
013:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015:         *  General Public License for more details.
016:         * 
017:         *  You should have received a copy of the GNU General Public License
018:         *  along with SkunkDAV; see the file COPYING.  If not, write to the Free
019:         *  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
020:         *  02111-1307, USA.
021:         *
022:         *  Revision: $Revision: 1.6 $ 
023:         */
024:        package org.skunk.config;
025:
026:        import java.beans.BeanInfo;
027:        import java.beans.IntrospectionException;
028:        import java.beans.Introspector;
029:        import java.beans.PropertyDescriptor;
030:        import java.lang.reflect.InvocationTargetException;
031:        import java.lang.reflect.Method;
032:        import java.util.HashMap;
033:        import java.util.Iterator;
034:        import org.skunk.trace.Debug;
035:
036:        public class Configurator {
037:            private ConfigStore store, defaultStore, reversionStore;
038:            private static Configurator configurator = null;
039:
040:            public static Configurator getConfigurator() {
041:                return configurator;
042:            }
043:
044:            public static void setConfigurator(Configurator configurator) {
045:                Configurator.configurator = configurator;
046:            }
047:
048:            public Configurator(ConfigStore store) {
049:                this .store = store;
050:                this .defaultStore = new InMemoryConfigStore();
051:                this .reversionStore = new InMemoryConfigStore();
052:            }
053:
054:            public ConfigStore getStore() {
055:                return store;
056:            }
057:
058:            public ConfigStore getReversionStore() {
059:                return reversionStore;
060:            }
061:
062:            public ConfigStore getDefaultStore() {
063:                return defaultStore;
064:            }
065:
066:            /**
067:             * configure the object's properties.  
068:             * Will take an array, too.
069:             * 
070:             */
071:            public void configure(Object configurable) {
072:                if (configurable instanceof  Class)
073:                    throw new IllegalArgumentException(
074:                            "configurable object may not be a Class object");
075:                Object[] configurables = (configurable instanceof  Object[]) ? (Object[]) configurable
076:                        : new Object[] { configurable };
077:                for (int i = 0; i < configurables.length; i++) {
078:                    _configure(configurable, store, false);
079:                }
080:            }
081:
082:            /**
083:             * starts a try transaction
084:             * @param configurable object to be configured -- may not be null
085:             */
086:            public void tryOn(Object configurable) {
087:                if (Debug.DEBUG)
088:                    Debug.trace(this , Debug.DP4, "object to try on: {0}",
089:                            configurable);
090:                if (configurable instanceof  Class)
091:                    throw new IllegalArgumentException(
092:                            "configurable object may not be a Class object");
093:                Object[] configurables = (configurable instanceof  Object[]) ? (Object[]) configurable
094:                        : new Object[] { configurable };
095:                for (int i = 0; i < configurables.length; i++) {
096:                    //we only want to store the original state of the data, before the
097:                    //try tranaction started.
098:                    boolean storeReversionData = !reversionStore
099:                            .isRegistered(configurable.getClass());
100:                    _configure(configurable, store, storeReversionData);
101:                }
102:            }
103:
104:            /**
105:             * ends a try transaction
106:             * @param configurable Object to be configured, or the class of such -- may not be null
107:             */
108:            public void tryOff(Object configurableOrClass) {
109:                if (configurableOrClass instanceof  Class) {
110:                    reversionStore.unregister((Class) configurableOrClass);
111:                } else
112:                    reversionStore.unregister(configurableOrClass.getClass());
113:            }
114:
115:            public void revert(Object configurable) {
116:                if (configurable instanceof  Class)
117:                    throw new IllegalArgumentException(
118:                            "configurable object may not be a Class object");
119:                if (configurable instanceof  Object[]) {
120:                    revertArray((Object[]) configurable);
121:                } else {
122:                    _configure(configurable, reversionStore, false);
123:                    reversionStore.unregister(configurable.getClass());
124:                }
125:            }
126:
127:            public void revertToDefault(Object configurable) {
128:                if (configurable instanceof  Class)
129:                    throw new IllegalArgumentException(
130:                            "configurable object may not be a Class object");
131:                _configure(configurable, defaultStore, false);
132:            }
133:
134:            private void revertArray(Object[] configurables) {
135:                HashMap classSet = new HashMap();
136:                //to facilitate use of a HashMap as a set (HashSet simply uses a HashMap instance internally)
137:                byte[] nothing = new byte[0];
138:                for (int i = 0; i < configurables.length; i++) {
139:                    Object configurable = configurables[i];
140:                    if (configurable instanceof  Class)
141:                        throw new IllegalArgumentException(
142:                                "configurable object may not be a Class object");
143:                    _configure(configurable, reversionStore, false);
144:                    classSet.put(configurable.getClass(), nothing);
145:                }
146:                for (Iterator it = classSet.keySet().iterator(); it.hasNext();)
147:                    reversionStore.unregister((Class) it.next());
148:            }
149:
150:            private void _configure(Object configurable,
151:                    ConfigStore configStore, boolean enableReversion) {
152:                Class configClass = configurable.getClass();
153:                boolean needDefaultValue = !defaultStore
154:                        .isRegistered(configClass);
155:                try {
156:                    BeanInfo info = Introspector.getBeanInfo(configClass);
157:                    PropertyDescriptor[] propDescriptors = info
158:                            .getPropertyDescriptors();
159:                    for (int i = 0; i < propDescriptors.length; i++) {
160:                        PropertyDescriptor pd = propDescriptors[i];
161:                        String propName = pd.getName();
162:                        //check store for property
163:                        Object value = configStore.getConfigValue(configClass,
164:                                propName);
165:                        if (value != null) {
166:                            if (Debug.DEBUG)
167:                                Debug.trace(this , Debug.DP3,
168:                                        "property found to configure: {0}",
169:                                        propName);
170:
171:                            //find getter method and store the current values in the reversion store
172:                            if (enableReversion || needDefaultValue) {
173:                                Method getter = pd.getReadMethod();
174:                                if (getter != null) {
175:                                    Object currentValue = getter.invoke(
176:                                            configurable, null);
177:                                    if (Debug.DEBUG)
178:                                        Debug.trace(this , Debug.DP3,
179:                                                "current config value is {0}",
180:                                                currentValue.toString());
181:                                    if (enableReversion) {
182:                                        if (Debug.DEBUG)
183:                                            Debug.trace(this , Debug.DP3,
184:                                                    "in reversion mode");
185:                                        reversionStore.setConfigValue(
186:                                                configClass, propName,
187:                                                currentValue);
188:                                    }
189:                                    if (needDefaultValue) {
190:                                        if (Debug.DEBUG)
191:                                            Debug.trace(this , Debug.DP3,
192:                                                    "getting default value");
193:                                        defaultStore.setConfigValue(
194:                                                configClass, propName,
195:                                                currentValue);
196:                                    }
197:                                }
198:                            }
199:                            if (Debug.DEBUG)
200:                                Debug
201:                                        .trace(
202:                                                this ,
203:                                                Debug.DP3,
204:                                                "getting write method: will invoke with argument {0}",
205:                                                new Object[] { value });
206:                            Method setter = pd.getWriteMethod();
207:                            if (setter != null)
208:                                setter.invoke(configurable,
209:                                        new Object[] { value });
210:                        }
211:                    }
212:                } catch (IntrospectionException intro) {
213:                    if (Debug.DEBUG)
214:                        Debug.trace(this , Debug.DP2, intro);
215:                } catch (IllegalAccessException illAcc) {
216:                    if (Debug.DEBUG)
217:                        Debug.trace(this , Debug.DP2, illAcc);
218:                } catch (IllegalArgumentException illArg) {
219:                    if (Debug.DEBUG)
220:                        Debug.trace(this , Debug.DP2, illArg);
221:                } catch (InvocationTargetException invoTarg) {
222:                    if (Debug.DEBUG)
223:                        Debug.trace(this , Debug.DP2, invoTarg);
224:                }
225:            }
226:        }
227:
228:        /*
229:         $Log: Configurator.java,v $
230:         Revision 1.6  2001/02/16 18:15:10  smulloni
231:         many fixes to TextEditorCustomizer.  FileMode and SyntaxStyle now have a
232:         configData property (they will probably be made into sibling classes).
233:
234:         Revision 1.5  2001/02/06 00:11:18  smulloni
235:         struggle, perhaps futile, with the TextEditorCustomizer and other implicated
236:         classes
237:
238:         Revision 1.4  2000/11/06 23:35:39  smullyan
239:         numerous changes to the configuration system, which is veering dangerously
240:         towards correct function.  LockRenderer is a table cell renderer that displays
241:         a lock icon.
242:
243:         Revision 1.3  2000/11/03 22:51:52  smullyan
244:         various changes to makefile to get it to work properly -- had to eliminate
245:         wildcard imports to get jikes to behave.  Continued hacking at configuration
246:         system, which now stores default settings.  TableViewCustomizer currently
247:         quite broken as I integrate into it my new DualListPanel component.
248:
249:         Revision 1.2  2000/11/03 00:16:33  smullyan
250:         massive work on the configuration system -- still buggy and rough.  One
251:         customizer sketched (inadequately, but for proof of concept):
252:         TableViewCustomizer.
253:
254:         Revision 1.1  2000/11/01 15:30:14  smullyan
255:         adding config classes (moved from package org.skunk.dav.client.gui.config)
256:
257:         Revision 1.2  2000/11/01 04:18:40  smullyan
258:         changes to configuration system: support of reversible configuration (in
259:         preparation for Preferences)
260:
261:         */
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