Source Code Cross Referenced for HandlerService.java in  » IDE-Eclipse » ui-workbench » org » eclipse » ui » internal » handlers » 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.handlers 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2005, 2007 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.handlers;
011:
012:        import java.util.Collection;
013:        import java.util.Collections;
014:        import java.util.Iterator;
015:
016:        import org.eclipse.core.commands.Command;
017:        import org.eclipse.core.commands.ExecutionEvent;
018:        import org.eclipse.core.commands.ExecutionException;
019:        import org.eclipse.core.commands.IHandler;
020:        import org.eclipse.core.commands.NotEnabledException;
021:        import org.eclipse.core.commands.NotHandledException;
022:        import org.eclipse.core.commands.ParameterizedCommand;
023:        import org.eclipse.core.commands.common.NotDefinedException;
024:        import org.eclipse.core.expressions.Expression;
025:        import org.eclipse.core.expressions.IEvaluationContext;
026:        import org.eclipse.swt.widgets.Event;
027:        import org.eclipse.swt.widgets.Shell;
028:        import org.eclipse.ui.ISourceProvider;
029:        import org.eclipse.ui.ISources;
030:        import org.eclipse.ui.commands.ICommandService;
031:        import org.eclipse.ui.handlers.IHandlerActivation;
032:        import org.eclipse.ui.handlers.IHandlerService;
033:        import org.eclipse.ui.internal.misc.Policy;
034:        import org.eclipse.ui.internal.services.IEvaluationService;
035:
036:        /**
037:         * <p>
038:         * Provides services related to activating and deactivating handlers within the
039:         * workbench.
040:         * </p>
041:         * 
042:         * @since 3.1
043:         */
044:        public final class HandlerService implements  IHandlerService {
045:
046:            static {
047:                Command.DEBUG_HANDLERS = Policy.DEBUG_HANDLERS_VERBOSE;
048:                Command.DEBUG_HANDLERS_COMMAND_ID = Policy.DEBUG_HANDLERS_VERBOSE_COMMAND_ID;
049:            }
050:
051:            /**
052:             * The command service for this handler service. This value is never
053:             * <code>null</code>.
054:             */
055:            private final ICommandService commandService;
056:
057:            /**
058:             * The central authority for determining which handler we should use.
059:             */
060:            private final HandlerAuthority handlerAuthority;
061:
062:            /**
063:             * The class providing persistence for this service.
064:             */
065:            private final HandlerPersistence handlerPersistence;
066:
067:            /**
068:             * Constructs a new instance of <code>CommandService</code> using a
069:             * command manager.
070:             * 
071:             * @param commandService
072:             *            The command service to use; must not be <code>null</code>.
073:             * @param evaluationService
074:             *            The evaluation service to use; must not be <code>null</code>.
075:             */
076:            public HandlerService(final ICommandService commandService,
077:                    final IEvaluationService evaluationService) {
078:                if (commandService == null) {
079:                    throw new NullPointerException(
080:                            "A handler service requires a command service"); //$NON-NLS-1$
081:                }
082:                this .commandService = commandService;
083:                this .handlerAuthority = new HandlerAuthority(commandService);
084:                this .handlerPersistence = new HandlerPersistence(this ,
085:                        evaluationService);
086:            }
087:
088:            public final IHandlerActivation activateHandler(
089:                    final IHandlerActivation childActivation) {
090:                final String commandId = childActivation.getCommandId();
091:                final IHandler handler = childActivation.getHandler();
092:                final Expression expression = childActivation.getExpression();
093:                final int depth = childActivation.getDepth() + 1;
094:                final IHandlerActivation localActivation = new HandlerActivation(
095:                        commandId, handler, expression, depth, this );
096:                handlerAuthority.activateHandler(localActivation);
097:                return localActivation;
098:            }
099:
100:            public final IHandlerActivation activateHandler(
101:                    final String commandId, final IHandler handler) {
102:                return activateHandler(commandId, handler, null);
103:            }
104:
105:            public final IHandlerActivation activateHandler(
106:                    final String commandId, final IHandler handler,
107:                    final Expression expression) {
108:                return activateHandler(commandId, handler, expression, false);
109:            }
110:
111:            public final IHandlerActivation activateHandler(
112:                    final String commandId, final IHandler handler,
113:                    final Expression expression, final boolean global) {
114:                final IHandlerActivation activation = new HandlerActivation(
115:                        commandId, handler, expression,
116:                        IHandlerActivation.ROOT_DEPTH, this );
117:                handlerAuthority.activateHandler(activation);
118:                return activation;
119:            }
120:
121:            public final IHandlerActivation activateHandler(
122:                    final String commandId, final IHandler handler,
123:                    final Expression expression, final int sourcePriority) {
124:                return activateHandler(commandId, handler, expression);
125:            }
126:
127:            public final void addSourceProvider(final ISourceProvider provider) {
128:                handlerAuthority.addSourceProvider(provider);
129:            }
130:
131:            public final ExecutionEvent createExecutionEvent(
132:                    final Command command, final Event event) {
133:                return new ExecutionEvent(command, Collections.EMPTY_MAP,
134:                        event, getCurrentState());
135:            }
136:
137:            public ExecutionEvent createExecutionEvent(
138:                    final ParameterizedCommand command, final Event event) {
139:                return new ExecutionEvent(command.getCommand(), command
140:                        .getParameterMap(), event, getCurrentState());
141:            }
142:
143:            public final void deactivateHandler(
144:                    final IHandlerActivation activation) {
145:                if (activation.getHandlerService() == this ) {
146:                    handlerAuthority.deactivateHandler(activation);
147:                }
148:            }
149:
150:            public final void deactivateHandlers(final Collection activations) {
151:                final Iterator activationItr = activations.iterator();
152:                while (activationItr.hasNext()) {
153:                    final IHandlerActivation activation = (IHandlerActivation) activationItr
154:                            .next();
155:                    deactivateHandler(activation);
156:                }
157:            }
158:
159:            public final void dispose() {
160:                handlerAuthority.dispose();
161:                handlerPersistence.dispose();
162:            }
163:
164:            public final Object executeCommand(
165:                    final ParameterizedCommand command, final Event trigger)
166:                    throws ExecutionException, NotDefinedException,
167:                    NotEnabledException, NotHandledException {
168:                return command.executeWithChecks(trigger, getCurrentState());
169:            }
170:
171:            public final Object executeCommand(final String commandId,
172:                    final Event trigger) throws ExecutionException,
173:                    NotDefinedException, NotEnabledException,
174:                    NotHandledException {
175:                final Command command = commandService.getCommand(commandId);
176:                final ExecutionEvent event = new ExecutionEvent(command,
177:                        Collections.EMPTY_MAP, trigger, getCurrentState());
178:                return command.executeWithChecks(event);
179:            }
180:
181:            public final IEvaluationContext getCurrentState() {
182:                return handlerAuthority.getCurrentState();
183:            }
184:
185:            public final void readRegistry() {
186:                handlerPersistence.read();
187:            }
188:
189:            public final void removeSourceProvider(
190:                    final ISourceProvider provider) {
191:                handlerAuthority.removeSourceProvider(provider);
192:            }
193:
194:            public final void setHelpContextId(final IHandler handler,
195:                    final String helpContextId) {
196:                commandService.setHelpContextId(handler, helpContextId);
197:            }
198:
199:            /**
200:             * <p>
201:             * Bug 95792. A mechanism by which the key binding architecture can force an
202:             * update of the handlers (based on the active shell) before trying to
203:             * execute a command. This mechanism is required for GTK+ only.
204:             * </p>
205:             * <p>
206:             * DO NOT CALL THIS METHOD.
207:             * </p>
208:             */
209:            public final void updateShellKludge() {
210:                handlerAuthority.updateShellKludge();
211:            }
212:
213:            /**
214:             * <p>
215:             * Bug 95792. A mechanism by which the key binding architecture can force an
216:             * update of the handlers (based on the active shell) before trying to
217:             * execute a command. This mechanism is required for GTK+ only.
218:             * </p>
219:             * <p>
220:             * DO NOT CALL THIS METHOD.
221:             * </p>
222:             * 
223:             * @param shell
224:             *            The shell that should be considered active; must not be
225:             *            <code>null</code>.
226:             */
227:            public final void updateShellKludge(final Shell shell) {
228:                final Shell currentActiveShell = handlerAuthority
229:                        .getActiveShell();
230:                if (currentActiveShell != shell) {
231:                    handlerAuthority.sourceChanged(ISources.ACTIVE_SHELL,
232:                            ISources.ACTIVE_SHELL_NAME, shell);
233:                }
234:            }
235:
236:            /**
237:             * Currently this is a an internal method to help locate a handler.
238:             * <p>
239:             * DO NOT CALL THIS METHOD.
240:             * </p>
241:             * 
242:             * @param commandId
243:             *            the command id to check
244:             * @param context
245:             *            the context to use for activations
246:             * @since 3.3
247:             */
248:            public final IHandler findHandler(String commandId,
249:                    IEvaluationContext context) {
250:                return handlerAuthority.findHandler(commandId, context);
251:            }
252:
253:            /**
254:             * Normally the context returned from getCurrentState() still tracks the
255:             * application state. This method creates a copy and fills it in with the
256:             * variables that we know about. Currently it does not fill in the active
257:             * selection.
258:             * <p>
259:             * DO NOT CALL THIS METHOD. It is experimental in 3.3.
260:             * </p>
261:             * 
262:             * @return an evaluation context with no parent.
263:             * @since 3.3
264:             */
265:            public final IEvaluationContext getContextSnapshot() {
266:                return handlerAuthority.getContextSnapshot();
267:            }
268:
269:            /**
270:             * Normally the context returned from getCurrentState() still tracks the
271:             * application state. This method creates a copy and fills it in with all the
272:             * variables that we know about.
273:             * <p>
274:             * DO NOT CALL THIS METHOD. It is experimental in 3.3.
275:             * </p>
276:             * 
277:             * @return an evaluation context with no parent.
278:             * @since 3.3
279:             */
280:            public final IEvaluationContext getFullContextSnapshot() {
281:                return handlerAuthority.getFullContextSnapshot();
282:            }
283:
284:            /**
285:             * Execute the command using the provided context. It takes care of finding
286:             * the correct active handler given the context, and executes with that
287:             * handler.
288:             * <p>
289:             * It currently cannot effect the enablement of the handler.
290:             * </p>
291:             * <p>
292:             * DO NOT CALL THIS METHOD. It is experimental in 3.3.
293:             * </p>
294:             * 
295:             * @param command
296:             *            the parameterized command to execute
297:             * @param trigger
298:             *            the SWT event trigger ... can be null
299:             * @param context
300:             *            the evaluation context to run against.
301:             * @return
302:             * @throws ExecutionException
303:             * @throws NotDefinedException
304:             * @throws NotEnabledException
305:             * @throws NotHandledException
306:             * @since 3.3
307:             * @see #getContextSnapshot()
308:             */
309:            public final Object executeCommandInContext(
310:                    final ParameterizedCommand command, final Event trigger,
311:                    IEvaluationContext context) throws ExecutionException,
312:                    NotDefinedException, NotEnabledException,
313:                    NotHandledException {
314:                IHandler oldHandler = command.getCommand().getHandler();
315:
316:                IHandler handler = findHandler(command.getId(), context);
317:                boolean enabled = true;
318:                if (handler instanceof  HandlerProxy) {
319:                    enabled = ((HandlerProxy) handler).getProxyEnabled();
320:                }
321:
322:                try {
323:                    command.getCommand().setHandler(handler);
324:                    if (handler instanceof  HandlerProxy) {
325:                        ((HandlerProxy) handler).setEnabledFor(context);
326:                    }
327:
328:                    return command.executeWithChecks(trigger, context);
329:                } finally {
330:                    if (handler instanceof  HandlerProxy) {
331:                        ((HandlerProxy) handler).setProxyEnabled(enabled);
332:                    }
333:                    command.getCommand().setHandler(oldHandler);
334:                }
335:            }
336:        }
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