| /******************************************************************************* |
| * Copyright (c) 2009, 2017 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.e4.core.commands.internal; |
| |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.Map; |
| import javax.inject.Inject; |
| import org.eclipse.core.commands.AbstractParameterValueConverter; |
| import org.eclipse.core.commands.Command; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.core.commands.IHandler; |
| import org.eclipse.core.commands.NotEnabledException; |
| import org.eclipse.core.commands.NotHandledException; |
| import org.eclipse.core.commands.ParameterType; |
| import org.eclipse.core.commands.ParameterValueConversionException; |
| import org.eclipse.core.commands.ParameterizedCommand; |
| import org.eclipse.core.commands.common.NotDefinedException; |
| import org.eclipse.e4.core.commands.EHandlerService; |
| import org.eclipse.e4.core.commands.ExpressionContext; |
| import org.eclipse.e4.core.contexts.ContextFunction; |
| import org.eclipse.e4.core.contexts.EclipseContextFactory; |
| import org.eclipse.e4.core.contexts.IEclipseContext; |
| import org.eclipse.e4.core.di.annotations.Optional; |
| import org.eclipse.e4.core.services.log.Logger; |
| |
| /** |
| * |
| */ |
| public class HandlerServiceImpl implements EHandlerService { |
| /** |
| * The static context key under which a command 'trigger' from legacy code is stored during |
| * calls to {@link #executeHandler(ParameterizedCommand, IEclipseContext)} |
| * |
| * @see IEclipseContext |
| * @see HandlerServiceImpl#executeHandler(ParameterizedCommand, IEclipseContext) |
| */ |
| private static final String SWT_TRIGGER = "org.eclipse.swt.widgets.Event"; //$NON-NLS-1$ |
| static final String TMP_STATIC_CONTEXT = "tmp-staticContext"; //$NON-NLS-1$ |
| public final static String H_ID = "handler::"; //$NON-NLS-1$ |
| public final static String PARM_MAP = "parmMap::"; //$NON-NLS-1$ |
| public final static String CAN_EXECUTE = "HandlerServiceImpl.canExecute"; //$NON-NLS-1$ |
| public final static String NOT_HANDLED = "HandlerServiceImpl.notHandled"; //$NON-NLS-1$ |
| public final static String STATIC_CONTEXT = "HandlerServiceImpl.staticContext"; //$NON-NLS-1$ |
| public final static String HANDLER_EXCEPTION = "HandlerServiceImpl.exception"; //$NON-NLS-1$ |
| |
| public static ContextFunction handlerGenerator = null; |
| |
| private static LinkedList<ExecutionContexts> DEFAULT_STACKLIST = new LinkedList<HandlerServiceImpl.ExecutionContexts>(); |
| |
| public static IHandler getHandler(String commandId, IEclipseContext context) { |
| if (handlerGenerator != null) { |
| return (IHandler) handlerGenerator.compute(null, commandId); |
| } |
| return new HandlerServiceHandler(commandId, context); |
| } |
| |
| public static class ExecutionContexts { |
| public IEclipseContext context; |
| public IEclipseContext staticContext; |
| |
| public ExecutionContexts(IEclipseContext ctx, IEclipseContext staticCtx) { |
| context = ctx; |
| staticContext = staticCtx; |
| } |
| } |
| |
| static LinkedList<ExecutionContexts> getContextStack(IEclipseContext context) { |
| if (context == null) { |
| return DEFAULT_STACKLIST; |
| } |
| Object handlerExecutionStack = context.get("_handlerExecutionStack"); //$NON-NLS-1$ |
| if (handlerExecutionStack == null) { |
| return DEFAULT_STACKLIST; |
| } |
| return (LinkedList<ExecutionContexts>) handlerExecutionStack; |
| } |
| |
| public static void push(IEclipseContext ctx, IEclipseContext staticCtx) { |
| getContextStack(ctx).addFirst(new ExecutionContexts(ctx, staticCtx)); |
| } |
| |
| public static ExecutionContexts pop(IEclipseContext ctx) { |
| return getContextStack(ctx).poll(); |
| } |
| |
| static ExecutionContexts peek(IEclipseContext ctx) { |
| return getContextStack(ctx).peek(); |
| } |
| |
| /** |
| * @param context |
| * the context to start the lookup process |
| * @param commandId |
| * @return a handler, or <code>null</code> |
| */ |
| public static Object lookUpHandler(IEclipseContext context, String commandId) { |
| return context.getActiveLeaf().get(H_ID + commandId); |
| } |
| |
| /** |
| * Fill in a temporary static context for execution. |
| * |
| * @param command |
| */ |
| @SuppressWarnings("rawtypes") |
| private void addParms(ParameterizedCommand command, IEclipseContext staticContext) { |
| final Map parms = command.getParameterMap(); |
| Iterator i = parms.entrySet().iterator(); |
| while (i.hasNext()) { |
| Map.Entry entry = (Map.Entry) i.next(); |
| String parameterId = (String) entry.getKey(); |
| staticContext.set( |
| parameterId, |
| convertParameterValue(command.getCommand(), parameterId, |
| (String) entry.getValue())); |
| } |
| staticContext.set(PARM_MAP, parms); |
| staticContext.set(ParameterizedCommand.class, command); |
| } |
| |
| /** |
| * Convert the parameter's value according to it's type. |
| * |
| * @param command |
| * @param parameterId |
| * @param value |
| * @return converted value |
| * @see org.eclipse.e4.ui.model.application.commands.MCommandParameter#getTypeId() |
| */ |
| private Object convertParameterValue(Command command, String parameterId, String value) { |
| try { |
| ParameterType parameterType = command.getParameterType(parameterId); |
| |
| if (parameterType != null) { |
| AbstractParameterValueConverter valueConverter = parameterType.getValueConverter(); |
| if (valueConverter != null) { |
| return valueConverter.convertToObject(value); |
| } |
| } |
| } catch (NotDefinedException e) { |
| } catch (ParameterValueConversionException e) { |
| } |
| return value; |
| } |
| |
| private IEclipseContext context; |
| |
| @Inject |
| @Optional |
| Logger logger; |
| |
| @Override |
| public void activateHandler(String commandId, Object handler) { |
| String handlerId = H_ID + commandId; |
| context.set(handlerId, handler); |
| } |
| |
| @Override |
| public boolean canExecute(ParameterizedCommand command) { |
| final IEclipseContext staticContext = EclipseContextFactory.create(TMP_STATIC_CONTEXT); |
| try { |
| return canExecute(command, staticContext); |
| } finally { |
| staticContext.dispose(); |
| } |
| } |
| |
| @Override |
| public boolean canExecute(ParameterizedCommand command, IEclipseContext staticContext) { |
| final IEclipseContext executionContext = getExecutionContext(); |
| addParms(command, staticContext); |
| // executionContext.set(STATIC_CONTEXT, staticContext); |
| push(executionContext, staticContext); |
| try { |
| Command cmd = command.getCommand(); |
| cmd.setEnabled(new ExpressionContext(peek(executionContext).context)); |
| return cmd.isEnabled(); |
| } finally { |
| pop(executionContext); |
| // executionContext.remove(STATIC_CONTEXT); |
| } |
| } |
| |
| @Override |
| public void deactivateHandler(String commandId, Object handler) { |
| context.remove(H_ID + commandId); |
| } |
| |
| @Override |
| public Object executeHandler(ParameterizedCommand command) { |
| final IEclipseContext staticContext = EclipseContextFactory.create(TMP_STATIC_CONTEXT); |
| try { |
| return executeHandler(command, staticContext); |
| } finally { |
| staticContext.dispose(); |
| } |
| } |
| |
| @Override |
| public Object executeHandler(ParameterizedCommand command, IEclipseContext staticContext) { |
| final IEclipseContext executionContext = getExecutionContext(); |
| addParms(command, staticContext); |
| // executionContext.set(STATIC_CONTEXT, staticContext); |
| push(executionContext, staticContext); |
| try { |
| // Command cmd = command.getCommand(); |
| return command.executeWithChecks(staticContext.get(SWT_TRIGGER), new ExpressionContext( |
| peek(executionContext).context)); |
| } catch (ExecutionException e) { |
| staticContext.set(HANDLER_EXCEPTION, e); |
| } catch (NotDefinedException e) { |
| staticContext.set(HANDLER_EXCEPTION, e); |
| } catch (NotEnabledException e) { |
| staticContext.set(HANDLER_EXCEPTION, e); |
| } catch (NotHandledException e) { |
| staticContext.set(HANDLER_EXCEPTION, e); |
| } finally { |
| pop(executionContext); |
| // executionContext.remove(STATIC_CONTEXT); |
| } |
| return null; |
| } |
| |
| @Inject |
| public void setContext(IEclipseContext c) { |
| context = c; |
| } |
| |
| public IEclipseContext getContext() { |
| return context; |
| } |
| |
| public IEclipseContext getExecutionContext() { |
| return context.getActiveLeaf(); |
| } |
| } |