Source Code Cross Referenced for SlaveContextService.java in  » IDE-Eclipse » ui-workbench » org » eclipse » ui » internal » contexts » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » ui workbench » org.eclipse.ui.internal.contexts 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2006 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         ******************************************************************************/package org.eclipse.ui.internal.contexts;
011:
012:        import java.util.ArrayList;
013:        import java.util.Collection;
014:        import java.util.HashMap;
015:        import java.util.HashSet;
016:        import java.util.Map;
017:        import java.util.Set;
018:
019:        import org.eclipse.core.commands.contexts.Context;
020:        import org.eclipse.core.commands.contexts.IContextManagerListener;
021:        import org.eclipse.core.expressions.Expression;
022:        import org.eclipse.swt.widgets.Shell;
023:        import org.eclipse.ui.ISourceProvider;
024:        import org.eclipse.ui.contexts.IContextActivation;
025:        import org.eclipse.ui.contexts.IContextService;
026:        import org.eclipse.ui.internal.expressions.AndExpression;
027:
028:        /**
029:         * A context service which delegates almost all responsibility to the parent
030:         * service.
031:         * <p>
032:         * This class is not intended for use outside of the
033:         * <code>org.eclipse.ui.workbench</code> plug-in.
034:         * </p>
035:         * 
036:         * @since 3.2
037:         * 
038:         */
039:        public class SlaveContextService implements  IContextService {
040:
041:            /**
042:             * The parent context service, which is never <code>null</code>.
043:             */
044:            protected IContextService fParentService;
045:
046:            /**
047:             * The default expression used when {@link #activateContext(String) } is
048:             * called. Contexts contributed that use this expression will only be active
049:             * with this service is active.
050:             */
051:            protected Expression fDefaultExpression;
052:
053:            /**
054:             * Our contexts that are currently active with the parent context service.
055:             */
056:            protected Set fParentActivations;
057:
058:            /**
059:             * A map of the local activation to the parent activations. If this service
060:             * is inactive, then all parent activations are <code>null</code>.
061:             * Otherwise, they point to the corresponding activation in the parent
062:             * service.
063:             */
064:            protected Map fLocalActivations;
065:
066:            /**
067:             * A collection of context manager listeners. The listeners are not
068:             * activated/deactivated, but they will be removed when this service is
069:             * disposed.
070:             */
071:            private Collection fContextManagerListeners;
072:
073:            /**
074:             * A collection of source providers. The listeners are not
075:             * activated/deactivated, but they will be removed when this service is
076:             * disposed.
077:             */
078:            private Collection fSourceProviders;
079:
080:            /**
081:             * A collection of shells registered through this service. The listeners are
082:             * not activated/deactivated, but they will be removed when this service is
083:             * disposed.
084:             */
085:            private Collection fRegisteredShells;
086:
087:            /**
088:             * Construct the new slave.
089:             * 
090:             * @param parentService
091:             *            the parent context service; must not be <code>null</code>.
092:             * @param defaultExpression
093:             *            A default expression to use to determine viability. It's
094:             *            mainly used for conflict resolution. It can be
095:             *            <code>null</code>.
096:             */
097:            public SlaveContextService(IContextService parentService,
098:                    Expression defaultExpression) {
099:                if (parentService == null) {
100:                    throw new NullPointerException(
101:                            "The parent context service must not be null"); //$NON-NLS-1$
102:                }
103:                fParentService = parentService;
104:                fDefaultExpression = defaultExpression;
105:                fParentActivations = new HashSet();
106:                fLocalActivations = new HashMap();
107:                fContextManagerListeners = new ArrayList();
108:                fSourceProviders = new ArrayList();
109:                fRegisteredShells = new ArrayList();
110:            }
111:
112:            /*
113:             * (non-Javadoc)
114:             * 
115:             * @see org.eclipse.ui.contexts.IContextService#activateContext(java.lang.String)
116:             */
117:            public IContextActivation activateContext(String contextId) {
118:                ContextActivation activation = new ContextActivation(contextId,
119:                        fDefaultExpression, this );
120:                return doActivateContext(activation);
121:            }
122:
123:            /*
124:             * (non-Javadoc)
125:             * 
126:             * @see org.eclipse.ui.contexts.IContextService#activateContext(java.lang.String,
127:             *      org.eclipse.core.expressions.Expression)
128:             */
129:            public IContextActivation activateContext(String contextId,
130:                    Expression expression) {
131:                return activateContext(contextId, expression, false);
132:            }
133:
134:            /*
135:             * (non-Javadoc)
136:             * 
137:             * @see org.eclipse.ui.contexts.IContextService#activateContext(java.lang.String,
138:             *      org.eclipse.core.expressions.Expression, boolean)
139:             */
140:            public IContextActivation activateContext(String contextId,
141:                    Expression expression, boolean global) {
142:                if (global) {
143:                    IContextActivation activation = fParentService
144:                            .activateContext(contextId, expression, global);
145:                    fParentActivations.add(activation);
146:                    return activation;
147:                }
148:                AndExpression andExpression = null;
149:                if (expression instanceof  AndExpression) {
150:                    andExpression = (AndExpression) expression;
151:                } else {
152:                    andExpression = new AndExpression();
153:                    if (expression != null) {
154:                        andExpression.add(expression);
155:                    }
156:                }
157:                if (fDefaultExpression != null) {
158:                    andExpression.add(fDefaultExpression);
159:                }
160:                ContextActivation activation = new ContextActivation(contextId,
161:                        andExpression, this );
162:                return doActivateContext(activation);
163:            }
164:
165:            /*
166:             * (non-Javadoc)
167:             * 
168:             * @see org.eclipse.ui.contexts.IContextService#activateContext(java.lang.String,
169:             *      org.eclipse.core.expressions.Expression, int)
170:             */
171:            public IContextActivation activateContext(String contextId,
172:                    Expression expression, int sourcePriorities) {
173:                return activateContext(contextId, expression);
174:            }
175:
176:            /*
177:             * (non-Javadoc)
178:             * 
179:             * @see org.eclipse.ui.contexts.IContextService#addContextManagerListener(org.eclipse.core.commands.contexts.IContextManagerListener)
180:             */
181:            public void addContextManagerListener(
182:                    IContextManagerListener listener) {
183:                if (!fContextManagerListeners.contains(listener)) {
184:                    fContextManagerListeners.add(listener);
185:                }
186:                fParentService.addContextManagerListener(listener);
187:            }
188:
189:            /*
190:             * (non-Javadoc)
191:             * 
192:             * @see org.eclipse.ui.services.IServiceWithSources#addSourceProvider(org.eclipse.ui.ISourceProvider)
193:             */
194:            public void addSourceProvider(ISourceProvider provider) {
195:                if (!fSourceProviders.contains(provider)) {
196:                    fSourceProviders.add(provider);
197:                }
198:                fParentService.addSourceProvider(provider);
199:            }
200:
201:            /*
202:             * (non-Javadoc)
203:             * 
204:             * @see org.eclipse.ui.contexts.IContextService#deactivateContext(org.eclipse.ui.contexts.IContextActivation)
205:             */
206:            public void deactivateContext(IContextActivation activation) {
207:                IContextActivation parentActivation = null;
208:                if (fLocalActivations.containsKey(activation)) {
209:                    parentActivation = (IContextActivation) fLocalActivations
210:                            .remove(activation);
211:                } else {
212:                    parentActivation = activation;
213:                }
214:                if (parentActivation != null) {
215:                    fParentService.deactivateContext(parentActivation);
216:                    fParentActivations.remove(parentActivation);
217:                }
218:            }
219:
220:            /*
221:             * (non-Javadoc)
222:             * 
223:             * @see org.eclipse.ui.contexts.IContextService#deactivateContexts(java.util.Collection)
224:             */
225:            public void deactivateContexts(Collection activations) {
226:                Object[] array = activations.toArray();
227:                for (int i = 0; i < array.length; i++) {
228:                    deactivateContext((IContextActivation) array[i]);
229:                    array[i] = null;
230:                }
231:            }
232:
233:            /*
234:             * (non-Javadoc)
235:             * 
236:             * @see org.eclipse.ui.services.IDisposable#dispose()
237:             */
238:            public void dispose() {
239:                fParentService.deactivateContexts(fParentActivations);
240:                fParentActivations.clear();
241:                fLocalActivations.clear();
242:
243:                // Remove any "resource", like listeners, that were associated
244:                // with this service.
245:                if (!fContextManagerListeners.isEmpty()) {
246:                    Object[] array = fContextManagerListeners.toArray();
247:                    for (int i = 0; i < array.length; i++) {
248:                        removeContextManagerListener((IContextManagerListener) array[i]);
249:                    }
250:                    fContextManagerListeners.clear();
251:                }
252:                if (!fSourceProviders.isEmpty()) {
253:                    Object[] array = fSourceProviders.toArray();
254:                    for (int i = 0; i < array.length; i++) {
255:                        removeSourceProvider((ISourceProvider) array[i]);
256:                    }
257:                    fSourceProviders.clear();
258:                }
259:                if (!fRegisteredShells.isEmpty()) {
260:                    Object[] array = fRegisteredShells.toArray();
261:                    for (int i = 0; i < array.length; i++) {
262:                        unregisterShell((Shell) array[i]);
263:                    }
264:                    fRegisteredShells.clear();
265:                }
266:            }
267:
268:            /**
269:             * Activate the context with respect to this slave service.
270:             * 
271:             * @param contextId
272:             *            the context id
273:             * @param expression
274:             *            the expression to use
275:             * @return the activated context
276:             */
277:            protected IContextActivation doActivateContext(
278:                    IContextActivation activation) {
279:                IContextActivation parentActivation = fParentService
280:                        .activateContext(activation.getContextId(), activation
281:                                .getExpression());
282:                fParentActivations.add(parentActivation);
283:                fLocalActivations.put(activation, parentActivation);
284:                return activation;
285:            }
286:
287:            /*
288:             * (non-Javadoc)
289:             * 
290:             * @see org.eclipse.ui.contexts.IContextService#getActiveContextIds()
291:             */
292:            public Collection getActiveContextIds() {
293:                return fParentService.getActiveContextIds();
294:            }
295:
296:            /*
297:             * (non-Javadoc)
298:             * 
299:             * @see org.eclipse.ui.contexts.IContextService#getContext(java.lang.String)
300:             */
301:            public Context getContext(String contextId) {
302:                return fParentService.getContext(contextId);
303:            }
304:
305:            /*
306:             * (non-Javadoc)
307:             * 
308:             * @see org.eclipse.ui.contexts.IContextService#getDefinedContextIds()
309:             */
310:            public Collection getDefinedContextIds() {
311:                return fParentService.getDefinedContextIds();
312:            }
313:
314:            /*
315:             * (non-Javadoc)
316:             * 
317:             * @see org.eclipse.ui.contexts.IContextService#getDefinedContexts()
318:             */
319:            public Context[] getDefinedContexts() {
320:                return fParentService.getDefinedContexts();
321:            }
322:
323:            /*
324:             * (non-Javadoc)
325:             * 
326:             * @see org.eclipse.ui.contexts.IContextService#getShellType(org.eclipse.swt.widgets.Shell)
327:             */
328:            public int getShellType(Shell shell) {
329:                return fParentService.getShellType(shell);
330:            }
331:
332:            /*
333:             * (non-Javadoc)
334:             * 
335:             * @see org.eclipse.ui.contexts.IContextService#readRegistry()
336:             */
337:            public void readRegistry() {
338:                fParentService.readRegistry();
339:            }
340:
341:            /*
342:             * (non-Javadoc)
343:             * 
344:             * @see org.eclipse.ui.contexts.IContextService#registerShell(org.eclipse.swt.widgets.Shell,
345:             *      int)
346:             */
347:            public boolean registerShell(Shell shell, int type) {
348:                if (!fRegisteredShells.contains(shell)) {
349:                    fRegisteredShells.add(shell);
350:                }
351:                return fParentService.registerShell(shell, type);
352:            }
353:
354:            /*
355:             * (non-Javadoc)
356:             * 
357:             * @see org.eclipse.ui.contexts.IContextService#removeContextManagerListener(org.eclipse.core.commands.contexts.IContextManagerListener)
358:             */
359:            public void removeContextManagerListener(
360:                    IContextManagerListener listener) {
361:                fContextManagerListeners.remove(listener);
362:                fParentService.removeContextManagerListener(listener);
363:            }
364:
365:            /*
366:             * (non-Javadoc)
367:             * 
368:             * @see org.eclipse.ui.services.IServiceWithSources#removeSourceProvider(org.eclipse.ui.ISourceProvider)
369:             */
370:            public void removeSourceProvider(ISourceProvider provider) {
371:                fSourceProviders.remove(provider);
372:                fParentService.removeSourceProvider(provider);
373:            }
374:
375:            /*
376:             * (non-Javadoc)
377:             * 
378:             * @see org.eclipse.ui.contexts.IContextService#unregisterShell(org.eclipse.swt.widgets.Shell)
379:             */
380:            public boolean unregisterShell(Shell shell) {
381:                fRegisteredShells.remove(shell);
382:                return fParentService.unregisterShell(shell);
383:            }
384:        }
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