| /******************************************************************************* |
| * Copyright (c) 2007, 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.ui.handlers; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.core.commands.Command; |
| import org.eclipse.core.commands.ExecutionEvent; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.core.commands.State; |
| import org.eclipse.core.expressions.IEvaluationContext; |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.ui.IEditorPart; |
| import org.eclipse.ui.ISources; |
| import org.eclipse.ui.IWorkbenchPart; |
| import org.eclipse.ui.IWorkbenchSite; |
| import org.eclipse.ui.IWorkbenchWindow; |
| |
| /** |
| * Some common utilities for working with handlers in Platform UI. |
| * <p> |
| * <b>Note</b>: this class should not be instantiated or extended by clients. |
| * </p> |
| * |
| * @since 3.3 |
| */ |
| public class HandlerUtil { |
| private static void noVariableFound(ExecutionEvent event, String name) |
| throws ExecutionException { |
| throw new ExecutionException("No " + name //$NON-NLS-1$ |
| + " found while executing " + event.getCommand().getId()); //$NON-NLS-1$ |
| } |
| |
| private static void incorrectTypeFound(ExecutionEvent event, String name, |
| Class expectedType, Class wrongType) throws ExecutionException { |
| throw new ExecutionException("Incorrect type for " //$NON-NLS-1$ |
| + name |
| + " found while executing " //$NON-NLS-1$ |
| + event.getCommand().getId() |
| + ", expected " + expectedType.getName() //$NON-NLS-1$ |
| + " found " + wrongType.getName()); //$NON-NLS-1$ |
| } |
| |
| /** |
| * Extract the variable. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @param name |
| * The variable name to extract. |
| * @return The object from the application context, or <code>null</code> |
| * if it could not be found. |
| */ |
| public static Object getVariable(ExecutionEvent event, String name) { |
| if (event.getApplicationContext() instanceof IEvaluationContext) { |
| Object var = ((IEvaluationContext) event.getApplicationContext()) |
| .getVariable(name); |
| return var == IEvaluationContext.UNDEFINED_VARIABLE ? null : var; |
| } |
| return null; |
| } |
| |
| /** |
| * Extract the variable. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @param name |
| * The variable name to extract. |
| * @return The object from the application context. Will not return |
| * <code>null</code>. |
| * @throws ExecutionException |
| * if the variable is not found. |
| */ |
| public static Object getVariableChecked(ExecutionEvent event, String name) |
| throws ExecutionException { |
| Object o = getVariable(event, name); |
| if (o == null) { |
| noVariableFound(event, name); |
| } |
| return o; |
| } |
| |
| /** |
| * Extract the variable. |
| * |
| * @param context |
| * The IEvaluationContext or <code>null</code> |
| * @param name |
| * The variable name to extract. |
| * @return The object from the application context, or <code>null</code> |
| * if it could not be found. |
| * @since 3.4 |
| */ |
| public static Object getVariable(Object context, String name) { |
| if (context instanceof IEvaluationContext) { |
| Object var = ((IEvaluationContext) context).getVariable(name); |
| return var == IEvaluationContext.UNDEFINED_VARIABLE ? null : var; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active contexts. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return a collection of String contextIds, or <code>null</code>. |
| */ |
| public static Collection getActiveContexts(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_CONTEXT_NAME); |
| if (o instanceof Collection) { |
| return (Collection) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active contexts. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return a collection of String contextIds. Will not return |
| * <code>null</code>. |
| * @throws ExecutionException |
| * If the context variable is not found. |
| */ |
| public static Collection getActiveContextsChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_CONTEXT_NAME); |
| if (!(o instanceof Collection)) { |
| incorrectTypeFound(event, ISources.ACTIVE_CONTEXT_NAME, |
| Collection.class, o.getClass()); |
| } |
| return (Collection) o; |
| } |
| |
| /** |
| * Return the active shell. Is not necessarily the active workbench window |
| * shell. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active shell, or <code>null</code>. |
| */ |
| public static Shell getActiveShell(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_SHELL_NAME); |
| if (o instanceof Shell) { |
| return (Shell) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active shell. Is not necessarily the active workbench window |
| * shell. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active shell. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active shell variable is not found. |
| */ |
| public static Shell getActiveShellChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_SHELL_NAME); |
| if (!(o instanceof Shell)) { |
| incorrectTypeFound(event, ISources.ACTIVE_SHELL_NAME, Shell.class, |
| o.getClass()); |
| } |
| return (Shell) o; |
| } |
| |
| /** |
| * Return the active workbench window. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active workbench window, or <code>null</code>. |
| */ |
| public static IWorkbenchWindow getActiveWorkbenchWindow(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_WORKBENCH_WINDOW_NAME); |
| if (o instanceof IWorkbenchWindow) { |
| return (IWorkbenchWindow) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active workbench window. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active workbench window. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active workbench window variable is not found. |
| */ |
| public static IWorkbenchWindow getActiveWorkbenchWindowChecked( |
| ExecutionEvent event) throws ExecutionException { |
| Object o = getVariableChecked(event, |
| ISources.ACTIVE_WORKBENCH_WINDOW_NAME); |
| if (!(o instanceof IWorkbenchWindow)) { |
| incorrectTypeFound(event, ISources.ACTIVE_WORKBENCH_WINDOW_NAME, |
| IWorkbenchWindow.class, o.getClass()); |
| } |
| return (IWorkbenchWindow) o; |
| } |
| |
| /** |
| * Return the active editor. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active editor, or <code>null</code>. |
| */ |
| public static IEditorPart getActiveEditor(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_EDITOR_NAME); |
| if (o instanceof IEditorPart) { |
| return (IEditorPart) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active editor. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active editor. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active editor variable is not found. |
| */ |
| public static IEditorPart getActiveEditorChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_EDITOR_NAME); |
| if (!(o instanceof IEditorPart)) { |
| incorrectTypeFound(event, ISources.ACTIVE_EDITOR_NAME, |
| IEditorPart.class, o.getClass()); |
| } |
| return (IEditorPart) o; |
| } |
| |
| /** |
| * Return the part id of the active editor. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the part id of the active editor, or <code>null</code>. |
| */ |
| public static String getActiveEditorId(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_EDITOR_ID_NAME); |
| if (o instanceof String) { |
| return (String) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the part id of the active editor. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the part id of the active editor. Will not return |
| * <code>null</code>. |
| * @throws ExecutionException |
| * If the active editor id variable is not found. |
| */ |
| public static String getActiveEditorIdChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_EDITOR_ID_NAME); |
| if (!(o instanceof String)) { |
| incorrectTypeFound(event, ISources.ACTIVE_EDITOR_ID_NAME, |
| String.class, o.getClass()); |
| } |
| return (String) o; |
| } |
| |
| /** |
| * Return the active part. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active part, or <code>null</code>. |
| */ |
| public static IWorkbenchPart getActivePart(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_PART_NAME); |
| if (o instanceof IWorkbenchPart) { |
| return (IWorkbenchPart) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active part. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active part. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active part variable is not found. |
| */ |
| public static IWorkbenchPart getActivePartChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_PART_NAME); |
| if (!(o instanceof IWorkbenchPart)) { |
| incorrectTypeFound(event, ISources.ACTIVE_PART_NAME, |
| IWorkbenchPart.class, o.getClass()); |
| } |
| return (IWorkbenchPart) o; |
| } |
| |
| /** |
| * Return the part id of the active part. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the part id of the active part, or <code>null</code>. |
| */ |
| public static String getActivePartId(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_PART_ID_NAME); |
| if (o instanceof String) { |
| return (String) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the part id of the active part. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the part id of the active part. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active part id variable is not found. |
| */ |
| public static String getActivePartIdChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_PART_ID_NAME); |
| if (!(o instanceof String)) { |
| incorrectTypeFound(event, ISources.ACTIVE_PART_ID_NAME, |
| String.class, o.getClass()); |
| } |
| return (String) o; |
| } |
| |
| /** |
| * Return the active part site. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active part site, or <code>null</code>. |
| */ |
| public static IWorkbenchSite getActiveSite(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_SITE_NAME); |
| if (o instanceof IWorkbenchSite) { |
| return (IWorkbenchSite) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active part site. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active part site. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active part site variable is not found. |
| */ |
| public static IWorkbenchSite getActiveSiteChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_SITE_NAME); |
| if (!(o instanceof IWorkbenchSite)) { |
| incorrectTypeFound(event, ISources.ACTIVE_SITE_NAME, |
| IWorkbenchSite.class, o.getClass()); |
| } |
| return (IWorkbenchSite) o; |
| } |
| |
| /** |
| * Return the current selection. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the current selection, or <code>null</code>. |
| */ |
| public static ISelection getCurrentSelection(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_CURRENT_SELECTION_NAME); |
| if (o instanceof ISelection) { |
| return (ISelection) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the current selection. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the current selection. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the current selection variable is not found. |
| */ |
| public static ISelection getCurrentSelectionChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, |
| ISources.ACTIVE_CURRENT_SELECTION_NAME); |
| if (!(o instanceof ISelection)) { |
| incorrectTypeFound(event, ISources.ACTIVE_CURRENT_SELECTION_NAME, |
| ISelection.class, o.getClass()); |
| } |
| return (ISelection) o; |
| } |
| |
| /** |
| * Return the menu IDs that were applied to the registered context menu. For |
| * example, #CompilationUnitEditorContext. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the menu IDs, or <code>null</code>. |
| */ |
| public static Collection getActiveMenus(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_MENU_NAME); |
| if (o instanceof Collection) { |
| return (Collection) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the menu IDs that were applied to the registered context menu. For |
| * example, #CompilationUnitEditorContext. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the menu IDs. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active menus variable is not found. |
| */ |
| public static Collection getActiveMenusChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.ACTIVE_MENU_NAME); |
| if (!(o instanceof Collection)) { |
| incorrectTypeFound(event, ISources.ACTIVE_MENU_NAME, |
| Collection.class, o.getClass()); |
| } |
| return (Collection) o; |
| } |
| |
| /** |
| * Return the active menu selection. The active menu is a registered context |
| * menu. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active menu selection, or <code>null</code>. |
| */ |
| public static ISelection getActiveMenuSelection(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_MENU_SELECTION_NAME); |
| if (o instanceof ISelection) { |
| return (ISelection) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active menu selection. The active menu is a registered context |
| * menu. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active menu selection. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active menu selection variable is not found. |
| */ |
| public static ISelection getActiveMenuSelectionChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, |
| ISources.ACTIVE_MENU_SELECTION_NAME); |
| if (!(o instanceof ISelection)) { |
| incorrectTypeFound(event, ISources.ACTIVE_MENU_SELECTION_NAME, |
| ISelection.class, o.getClass()); |
| } |
| return (ISelection) o; |
| } |
| |
| /** |
| * Return the active menu editor input, if available. The active menu is a |
| * registered context menu. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active menu editor, or <code>null</code>. |
| */ |
| public static ISelection getActiveMenuEditorInput(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.ACTIVE_MENU_EDITOR_INPUT_NAME); |
| if (o instanceof ISelection) { |
| return (ISelection) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the active menu editor input. The active menu is a registered |
| * context menu. Some context menus do not include the editor input which |
| * will throw an exception. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the active menu editor input. Will not return <code>null</code>. |
| * @throws ExecutionException |
| * If the active menu editor input variable is not found. |
| */ |
| public static ISelection getActiveMenuEditorInputChecked( |
| ExecutionEvent event) throws ExecutionException { |
| Object o = getVariableChecked(event, |
| ISources.ACTIVE_MENU_EDITOR_INPUT_NAME); |
| if (!(o instanceof ISelection)) { |
| incorrectTypeFound(event, ISources.ACTIVE_MENU_EDITOR_INPUT_NAME, |
| ISelection.class, o.getClass()); |
| } |
| return (ISelection) o; |
| } |
| |
| /** |
| * Return the ShowInContext selection. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the show in selection, or <code>null</code>. |
| * @since 3.4 |
| */ |
| public static ISelection getShowInSelection(ExecutionEvent event) { |
| Object o = getVariable(event, ISources.SHOW_IN_SELECTION); |
| if (o instanceof ISelection) { |
| return (ISelection) o; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the ShowInContext selection. Will not return <code>null</code>. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the show in selection, or <code>null</code>. |
| * @throws ExecutionException |
| * If the show in selection variable is not found. |
| * @since 3.4 |
| */ |
| public static ISelection getShowInSelectionChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object o = getVariableChecked(event, ISources.SHOW_IN_SELECTION); |
| if (!(o instanceof ISelection)) { |
| incorrectTypeFound(event, ISources.SHOW_IN_SELECTION, |
| ISelection.class, o.getClass()); |
| } |
| return (ISelection) o; |
| } |
| |
| /** |
| * Return the ShowInContext input. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the show in input, or <code>null</code>. |
| * @since 3.4 |
| */ |
| public static Object getShowInInput(ExecutionEvent event) { |
| Object var = getVariable(event, ISources.SHOW_IN_INPUT); |
| return var; |
| } |
| |
| /** |
| * Return the ShowInContext input. Will not return <code>null</code>. |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return the show in input, or <code>null</code>. |
| * @throws ExecutionException |
| * If the show in input variable is not found. |
| * @since 3.4 |
| */ |
| public static Object getShowInInputChecked(ExecutionEvent event) |
| throws ExecutionException { |
| Object var = getVariableChecked(event, ISources.SHOW_IN_INPUT); |
| return var; |
| } |
| |
| /** |
| * Toggles the command's state. |
| * |
| * @param command The command whose state needs to be toggled |
| * @return the original value before toggling |
| * |
| * @throws ExecutionException |
| * When the command doesn't contain the toggle state or when the state doesn't contain a boolean value |
| * |
| * @since 3.5 |
| */ |
| public static boolean toggleCommandState(Command command) throws ExecutionException { |
| State state = command.getState(RegistryToggleState.STATE_ID); |
| if(state == null) |
| throw new ExecutionException("The command does not have a toggle state"); //$NON-NLS-1$ |
| if(!(state.getValue() instanceof Boolean)) |
| throw new ExecutionException("The command's toggle state doesn't contain a boolean value"); //$NON-NLS-1$ |
| |
| boolean oldValue = ((Boolean) state.getValue()).booleanValue(); |
| state.setValue(new Boolean(!oldValue)); |
| return oldValue; |
| } |
| |
| /** |
| * Checks whether the radio state of the command is same as the radio state |
| * parameter's value |
| * |
| * @param event |
| * The execution event that contains the application context |
| * @return <code>true</code> whe the values are same, <code>false</code> |
| * otherwise |
| * |
| * @throws ExecutionException |
| * When the command doesn't have the radio state or the event |
| * doesn't have the radio state parameter |
| * @since 3.5 |
| */ |
| public static boolean matchesRadioState(ExecutionEvent event) |
| throws ExecutionException { |
| |
| String parameter = event.getParameter(RadioState.PARAMETER_ID); |
| if (parameter == null) |
| throw new ExecutionException( |
| "The event does not have the radio state parameter"); //$NON-NLS-1$ |
| |
| Command command = event.getCommand(); |
| State state = command.getState(RadioState.STATE_ID); |
| if (state == null) |
| throw new ExecutionException( |
| "The command does not have a radio state"); //$NON-NLS-1$ |
| if (!(state.getValue() instanceof String)) |
| throw new ExecutionException( |
| "The command's radio state doesn't contain a String value"); //$NON-NLS-1$ |
| |
| return parameter.equals(state.getValue()); |
| } |
| |
| /** |
| * Updates the radio state of the command to the given value |
| * |
| * @param command |
| * the command whose state should be updated |
| * @param newState |
| * the new state |
| * |
| * @throws ExecutionException |
| * When the command doesn't have a radio state |
| * @since 3.5 |
| */ |
| public static void updateRadioState(Command command, String newState) |
| throws ExecutionException { |
| |
| State state = command.getState(RadioState.STATE_ID); |
| if (state == null) |
| throw new ExecutionException( |
| "The command does not have a radio state"); //$NON-NLS-1$ |
| state.setValue(newState); |
| } |
| |
| } |