Source Code Cross Referenced for DefaultLightWeightParsingControl.java in  » IDE » DrJava » edu » rice » cs » drjava » model » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » DrJava » edu.rice.cs.drjava.model 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*BEGIN_COPYRIGHT_BLOCK
002:         *
003:         * Copyright (c) 2001-2007, JavaPLT group at Rice University (javaplt@rice.edu)
004:         * 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 are met:
008:         *    * Redistributions of source code must retain the above copyright
009:         *      notice, this list of conditions and the following disclaimer.
010:         *    * Redistributions in binary form must reproduce the above copyright
011:         *      notice, this list of conditions and the following disclaimer in the
012:         *      documentation and/or other materials provided with the distribution.
013:         *    * Neither the names of DrJava, the JavaPLT group, Rice University, nor the
014:         *      names of its contributors may be used to endorse or promote products
015:         *      derived from this software without specific prior written permission.
016:         * 
017:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
018:         * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
019:         * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
020:         * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
021:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
022:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
023:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
024:         * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
025:         * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
026:         * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
027:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
028:         *
029:         * This software is Open Source Initiative approved Open Source Software.
030:         * Open Source Initative Approved is a trademark of the Open Source Initiative.
031:         * 
032:         * This file is part of DrJava.  Download the current version of this project
033:         * from http://www.drjava.org/ or http://sourceforge.net/projects/drjava/
034:         * 
035:         * END_COPYRIGHT_BLOCK*/
036:
037:        package edu.rice.cs.drjava.model;
038:
039:        import java.util.List;
040:        import java.util.LinkedList;
041:        import java.util.Hashtable;
042:        import javax.swing.text.*;
043:
044:        import edu.rice.cs.drjava.DrJava;
045:        import edu.rice.cs.drjava.config.OptionConstants;
046:        import edu.rice.cs.drjava.model.definitions.*;
047:        import edu.rice.cs.util.Log;
048:        import edu.rice.cs.util.swing.Utilities;
049:
050:        /** Default light-weight parsing control.
051:         *  @version $Id$
052:         */
053:        public class DefaultLightWeightParsingControl implements 
054:                LightWeightParsingControl {
055:            /** The model. */
056:            private AbstractGlobalModel _model;
057:
058:            /** The time at which updates may be performed. */
059:            private long _beginUpdates;
060:
061:            /** The time at which the last delay operation was performed. */
062:            private long _lastDelay = System.currentTimeMillis();
063:
064:            /** Last updates for the documents. */
065:            private Hashtable<OpenDefinitionsDocument, Long> _lastUpdates = new Hashtable<OpenDefinitionsDocument, Long>();
066:
067:            /** Enclosing class names for the documents. */
068:            private Hashtable<OpenDefinitionsDocument, String> _enclosingClassNames = new Hashtable<OpenDefinitionsDocument, String>();
069:
070:            /** Flag to stop automatic updates. */
071:            private volatile boolean _running = false;
072:
073:            /** Monitor to restart automatic updates. */
074:            private Object _restart = new Object();
075:
076:            /** List of listeners. */
077:            private LinkedList<LightWeightParsingListener> _listeners = new LinkedList<LightWeightParsingListener>();
078:
079:            /** Log file. */
080:            private static final Log _log = new Log("LightWeightParsing", false);
081:
082:            /** Thread group for the updater. */
083:            private ThreadGroup _updaterThreadGroup = new ThreadGroup(
084:                    "Light-weight parsing updater thread group") {
085:                public void uncaughtException(Thread t, Throwable e) {
086:                    _log
087:                            .log(
088:                                    "Uncaught exception in updater; disabled for rest of session",
089:                                    e);
090:                    new edu.rice.cs.drjava.ui.DrJavaErrorHandler().handle(e);
091:                }
092:            };
093:
094:            /** Thread to perform automatic updates. */
095:            private Thread _updater = new Thread(_updaterThreadGroup,
096:                    new Runnable() {
097:                        public void run() {
098:                            while (true) { // this is ok, it's a daemon thread and will die when all other threads have died
099:                                while (!_running) {
100:                                    _log.log("Waiting...");
101:                                    try {
102:                                        synchronized (_restart) {
103:                                            if (!_running) {
104:                                                _restart.wait();
105:                                            }
106:                                        }
107:                                    } catch (InterruptedException e) {
108:                                    }
109:                                }
110:                                long current = System.currentTimeMillis();
111:                                long delta = (_beginUpdates - current);
112:                                // _log.logTime("Begin updates at "+_beginUpdates+" (delta="+delta+")");
113:                                if (current >= _beginUpdates) {
114:                                    OpenDefinitionsDocument doc = _model
115:                                            .getActiveDocument();
116:                                    Long last = _lastUpdates.get(doc);
117:                                    if ((last == null) || (last < _lastDelay)) {
118:                                        update(doc);
119:                                        // _log.logTime("Update done.");
120:                                    } else {
121:                                        // _log.logTime("Not updating, last update was at "+last);
122:                                    }
123:                                    delta = DrJava
124:                                            .getConfig()
125:                                            .getSetting(
126:                                                    OptionConstants.DIALOG_LIGHTWEIGHT_PARSING_DELAY)
127:                                            .intValue();
128:                                }
129:                                // _log.logTime("Not updating, sleeping for "+delta);
130:                                try {
131:                                    Thread.sleep(delta);
132:                                } catch (InterruptedException e) { /* ignore, just wake up earlier and retry */
133:                                }
134:                            }
135:                        }
136:                    });
137:
138:            /** Create the default light-weight parsing control.
139:             *  @param model the model */
140:            public DefaultLightWeightParsingControl(AbstractGlobalModel model) {
141:                _model = model;
142:                _updater.setDaemon(true);
143:                _updater.start();
144:            }
145:
146:            /** Perform light-weight parsing. */
147:            public synchronized void update(final OpenDefinitionsDocument doc) {
148:                _log.log("Update for " + doc);
149:                try {
150:                    _lastUpdates.put(doc, System.currentTimeMillis());
151:                    final String old = _enclosingClassNames.get(doc);
152:                    final String updated = doc.getEnclosingClassName(doc
153:                            .getCaretPosition(), true);
154:                    if ((old == null) || (!old.equals(updated))) {
155:                        _enclosingClassNames.put(doc, updated);
156:                        Utilities.invokeLater(new Runnable() {
157:                            public void run() {
158:                                List<LightWeightParsingListener> listeners = getListeners();
159:                                for (LightWeightParsingListener l : listeners) {
160:                                    l.enclosingClassNameUpdated(doc, old,
161:                                            updated);
162:                                }
163:                            }
164:                        });
165:                    }
166:                } catch (BadLocationException e) { /* ignore */
167:                } catch (ClassNameNotFoundException e) { /* ignore */
168:                }
169:            }
170:
171:            /** Start or stop automatic updates.
172:             *  @param b  {@code true} to start or {@code false} to stop automatic updates
173:             */
174:            public void setAutomaticUpdates(boolean b) {
175:                _log.log("setAutomaticUpdates(" + b + ")");
176:                _running = b;
177:                if (b) {
178:                    delay();
179:                    synchronized (_restart) {
180:                        _restart.notify();
181:                    }
182:                }
183:            }
184:
185:            /** Delay the next update. */
186:            public void delay() {
187:                _lastDelay = System.currentTimeMillis();
188:                _beginUpdates = _lastDelay
189:                        + (DrJava
190:                                .getConfig()
191:                                .getSetting(
192:                                        OptionConstants.DIALOG_LIGHTWEIGHT_PARSING_DELAY)
193:                                .intValue());
194:            }
195:
196:            /** Reset light-weight parsing. Forget everything. */
197:            public synchronized void reset() {
198:                for (final OpenDefinitionsDocument doc : _enclosingClassNames
199:                        .keySet()) {
200:                    final String old = _enclosingClassNames.get(doc);
201:                    Utilities.invokeLater(new Runnable() {
202:                        public void run() {
203:                            List<LightWeightParsingListener> listeners = getListeners();
204:                            for (LightWeightParsingListener l : listeners) {
205:                                l.enclosingClassNameUpdated(doc, old, null);
206:                            }
207:                        }
208:                    });
209:                }
210:                _enclosingClassNames.clear();
211:                _lastUpdates.clear();
212:            }
213:
214:            /** Return the last enclosing class name for the specified document, "" if not inside a class, or
215:             *  null if unknown.
216:             *  WARNING: In long source files and when contained in anonymous inner classes, this function might take a LONG time.
217:             *  @param doc the document for which we want the information
218:             *  @return the enclosing class name
219:             */
220:            public synchronized String getEnclosingClassName(
221:                    OpenDefinitionsDocument doc) {
222:                return _enclosingClassNames.get(doc);
223:            }
224:
225:            /** Add the listener to this controller.
226:             *  @param l listener to add */
227:            public synchronized void addListener(LightWeightParsingListener l) {
228:                _listeners.add(l);
229:            }
230:
231:            /** Remove the listener from this controller. */
232:            public synchronized void removeListener(LightWeightParsingListener l) {
233:                _listeners.remove(l);
234:            }
235:
236:            /** Remove all listeners from this controller. */
237:            public synchronized void removeAllListeners() {
238:                _listeners.clear();
239:            }
240:
241:            /** @return a copy of the list of listeners. */
242:            public synchronized List<LightWeightParsingListener> getListeners() {
243:                return new LinkedList<LightWeightParsingListener>(_listeners);
244:            }
245:        }
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