Source Code Cross Referenced for LinkingPortletPreferences.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » portal » generic » context » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.portal.generic.context 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Apache Software License, Version 1.1
003:         *
004:         * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * 1. Redistributions of source code must retain the above copyright
011:         *    notice, this list of conditions and the following disclaimer.
012:         *
013:         * 2. Redistributions in binary form must reproduce the above copyright
014:         *    notice, this list of conditions and the following disclaimer in
015:         *    the documentation and/or other materials provided with the
016:         *    distribution.
017:         *
018:         * 3. The end-user documentation included with the redistribution, if
019:         *    any, must include the following acknowlegement:
020:         *       "This product includes software developed by the
021:         *        Caucho Technology (http://www.caucho.com/)."
022:         *    Alternately, this acknowlegement may appear in the software itself,
023:         *    if and wherever such third-party acknowlegements normally appear.
024:         *
025:         * 4. The names "Hessian", "Resin", and "Caucho" must not be used to
026:         *    endorse or promote products derived from this software without prior
027:         *    written permission. For written permission, please contact
028:         *    info@caucho.com.
029:         *
030:         * 5. Products derived from this software may not be called "Resin"
031:         *    nor may "Resin" appear in their names without prior written
032:         *    permission of Caucho Technology.
033:         *
034:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
035:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
036:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
037:         * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
038:         * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
039:         * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
040:         * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
041:         * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
042:         * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
043:         * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
044:         * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
045:         *
046:         * @author Sam
047:         */
048:
049:        package com.caucho.portal.generic.context;
050:
051:        import javax.portlet.PortletPreferences;
052:        import javax.portlet.PreferencesValidator;
053:        import javax.portlet.ReadOnlyException;
054:        import javax.portlet.ValidatorException;
055:        import java.io.IOException;
056:        import java.util.*;
057:        import java.util.logging.Logger;
058:
059:        /**
060:         * An implementation of PortletPreferences that stores values temporarily,
061:         * retrieves values from a store or defaults, validates before
062:         * before storing, and stores the values into the store.
063:         */
064:        public class LinkingPortletPreferences implements  PortletPreferences {
065:            static protected final Logger log = Logger
066:                    .getLogger(LinkingPortletPreferences.class.getName());
067:
068:            static private String[] DUMMY = new String[] { "<dummy>" };
069:            static private String[] DELETED = new String[] { "<deleted>" };
070:
071:            private PortletPreferences _defaults;
072:            private ArrayList<PreferencesValidator> _validators;
073:            private Map<String, String[]> _storeMap;
074:
075:            private Map<String, String[]> _valueMap;
076:
077:            public LinkingPortletPreferences() {
078:            }
079:
080:            public void start(PortletPreferences defaults,
081:                    ArrayList<PreferencesValidator> validators,
082:                    Map<String, String[]> storeMap) {
083:                if (_defaults != null || _storeMap != null)
084:                    throw new IllegalStateException("missing finish()?");
085:
086:                _defaults = defaults;
087:                _validators = validators;
088:                _storeMap = storeMap;
089:            }
090:
091:            public void finish() {
092:                if (_valueMap != null)
093:                    _valueMap.clear();
094:
095:                _defaults = null;
096:                _validators = null;
097:                _storeMap = null;
098:            }
099:
100:            public PortletPreferences getDefaults() {
101:                return _defaults;
102:            }
103:
104:            public ArrayList<PreferencesValidator> getValidators() {
105:                return _validators;
106:            }
107:
108:            public Map<String, String[]> getStore() {
109:                return _storeMap;
110:            }
111:
112:            /**
113:             * {@inheritDoc}
114:             */
115:            public boolean isReadOnly(String key) {
116:                boolean r = false;
117:
118:                if (_defaults != null && _defaults.isReadOnly(key))
119:                    return true;
120:                else
121:                    return false;
122:            }
123:
124:            /**
125:             * {@inheritDoc}
126:             */
127:            public String getValue(String key, String def) {
128:                String[] values = getValues(key, DUMMY);
129:
130:                if (values == DUMMY)
131:                    return def;
132:                else
133:                    return (values == null || values.length == 0) ? null
134:                            : values[0];
135:            }
136:
137:            /**
138:             * {@inheritDoc}
139:             */
140:            public String[] getValues(String key, String[] def) {
141:                String[] v = _valueMap == null ? null : _valueMap.get(key);
142:
143:                if (v != DELETED) {
144:                    if (v != null
145:                            || (_valueMap != null && _valueMap.containsKey(key)))
146:                        return v;
147:                }
148:
149:                if (_defaults != null)
150:                    def = _defaults.getValues(key, def);
151:
152:                if (_storeMap != null) {
153:                    String[] storeValues = _storeMap.get(key);
154:
155:                    if (storeValues != null)
156:                        def = storeValues;
157:                }
158:
159:                return def;
160:            }
161:
162:            /**
163:             * {@inheritDoc}
164:             */
165:            public void setValue(String key, String value)
166:                    throws ReadOnlyException {
167:                setValues(key, value == null ? null : new String[] { value });
168:            }
169:
170:            /**
171:             * {@inheritDoc}
172:             */
173:            public void setValues(String key, String[] values)
174:                    throws ReadOnlyException {
175:                if (isReadOnly(key))
176:                    throw new ReadOnlyException("key `" + key + "'");
177:                else {
178:                    if (_valueMap == null)
179:                        _valueMap = new LinkedHashMap<String, String[]>();
180:
181:                    _valueMap.put(key, values);
182:                }
183:            }
184:
185:            /**
186:             * {@inheritDoc}
187:             */
188:            public void reset(String key) throws ReadOnlyException {
189:                if (_storeMap != null && _storeMap.containsKey(key))
190:                    setValues(key, DELETED);
191:                else if (isReadOnly(key))
192:                    throw new ReadOnlyException("key `" + key + "'");
193:            }
194:
195:            /**
196:             * {@inheritDoc}
197:             *
198:             * Returns the unique set of names in this
199:             * object, the backing store, and the default preferences.
200:             */
201:            public Enumeration getNames() {
202:                // XXX: this would be better implemented as a class extending
203:                // Iterator<String> which could also be used by getMap() below
204:
205:                // the assumption here is that this will not be called very often,
206:                // and when it is a sorted list of names is valuable
207:
208:                TreeSet<String> names = new TreeSet<String>();
209:
210:                if (_valueMap != null) {
211:                    Iterator<Map.Entry<String, String[]>> iter = _valueMap
212:                            .entrySet().iterator();
213:
214:                    while (iter.hasNext()) {
215:                        Map.Entry<String, String[]> entry = iter.next();
216:
217:                        String key = entry.getKey();
218:                        String[] value = entry.getValue();
219:
220:                        if (value != DELETED)
221:                            names.add(key);
222:                    }
223:                }
224:
225:                if (_storeMap != null) {
226:                    Iterator<String> iter = _storeMap.keySet().iterator();
227:
228:                    while (iter.hasNext()) {
229:                        String key = iter.next();
230:
231:                        if (_valueMap != null && _valueMap.get(key) == DELETED)
232:                            continue;
233:
234:                        names.add(key);
235:                    }
236:                }
237:
238:                if (_defaults != null) {
239:                    Enumeration e = _defaults.getNames();
240:
241:                    while (e.hasMoreElements()) {
242:                        String key = (String) e.nextElement();
243:
244:                        if (_valueMap != null && _valueMap.get(key) == DELETED)
245:                            continue;
246:
247:                        names.add(key);
248:                    }
249:                }
250:
251:                return Collections.enumeration(names);
252:            }
253:
254:            /**
255:             * {@inheritDoc}
256:             */
257:            public Map getMap() {
258:                // XXX: this would be better as a custom implementation of AbstractMap
259:
260:                Map<String, String[]> map = new HashMap<String, String[]>();
261:
262:                Enumeration e = getNames();
263:
264:                while (e.hasMoreElements()) {
265:                    String key = (String) e.nextElement();
266:                    map.put(key, getValues(key, null));
267:                }
268:
269:                return map;
270:            }
271:
272:            /**
273:             * {@inheritDoc}
274:             *
275:             * This implementation first invokes the validators (if any), and then
276:             * propogates the properties set in this object to the the store.
277:             * If the store has not been set then only the invoking of the validators is
278:             * performed, the values are left unchanged.
279:             */
280:            public void store() throws IOException, ValidatorException {
281:                if (_validators != null) {
282:                    for (int i = 0; i < _validators.size(); i--) {
283:                        _validators.get(i).validate(this );
284:                    }
285:                }
286:
287:                if (_storeMap != null && _valueMap != null) {
288:                    Iterator<Map.Entry<String, String[]>> iter = _valueMap
289:                            .entrySet().iterator();
290:
291:                    while (iter.hasNext()) {
292:                        Map.Entry<String, String[]> entry = iter.next();
293:
294:                        String key = entry.getKey();
295:                        String[] values = entry.getValue();
296:
297:                        if (values == DELETED)
298:                            _storeMap.remove(key);
299:                        else
300:                            _storeMap.put(key, values);
301:                    }
302:                }
303:
304:                discard();
305:            }
306:
307:            /**
308:             * Discard all changes.
309:             */
310:            public void discard() {
311:                if (_valueMap != null)
312:                    _valueMap.clear();
313:            }
314:        }
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