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/*******************************************************************************
* Copyright (c) 2008 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.ui.internal.commands;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jpt.core.context.PersistentType;
import org.eclipse.jpt.ui.internal.menus.PersistentTypeMapAsContribution;
import org.eclipse.ui.ISources;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.commands.IElementUpdater;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.menus.UIElement;
import org.eclipse.ui.services.IEvaluationService;
/**
* This handler is responsible to change the mapping type of the selected
* <code>PersistentType</code>.
* <p>
* This handler is defined in the JPT plugin.xml. It will be invoked by the
* mapping action dynamically created by the <code>PersistentTypeMapAsContribution</code>.
*
* @see PersistentType
* @see PersistentTypeMapAsContribution
*
* @version 2.0
* @since 2.0
*/
@SuppressWarnings("nls")
public class PersistentTypeMapAsHandler extends AbstractHandler
implements IElementUpdater
{
/**
* The unique identifier of the Map As command used for {@link PersistentType}
* defined in the <code>JptUiPlugin</code> plugin.xml.
*/
public static final String COMMAND_ID = "org.eclipse.jpt.ui.persistentTypeMapAs";
/**
* The unique identifier of the Map As command parameter used for {@link PersistentType}
* defined in the <code>JptUiPlugin</code> plugin.xml.
*/
public static final String COMMAND_PARAMETER_ID = "persistentTypeMappingKey";
/**
* Creates a new <code>PersistentTypeMapAsHandler</code>.
*/
public PersistentTypeMapAsHandler() {
super();
}
public Object execute(ExecutionEvent event) throws ExecutionException {
// Retrieve the selection from the ExecutionEvent
IStructuredSelection selection = (IStructuredSelection)
HandlerUtil.getCurrentSelectionChecked(event);
// Retrieve the value of the unique parameter passed to the command
String mappingKey = event.getParameter(COMMAND_PARAMETER_ID);
// Change the mapping key for all the selected items
for (Object item : selection.toArray()) {
PersistentType type = (PersistentType) item;
type.setMappingKey(mappingKey);
}
return null;
}
@SuppressWarnings("unchecked")
public void updateElement(UIElement element, Map parameters) {
// Retrieve the selection for the UIElement
// Due to Bug 226746, we have to use API workaround to retrieve current
// selection
IEvaluationService es
= (IEvaluationService) element.getServiceLocator().getService(IEvaluationService.class);
IViewPart part =
(IViewPart) es.getCurrentState().getVariable(ISources.ACTIVE_PART_NAME);
IStructuredSelection selection
= (IStructuredSelection) part.getSite().getSelectionProvider().getSelection();
String commonMappingKey = commonMappingKey(selection);
String handlerMappingKey = (String) parameters.get(COMMAND_PARAMETER_ID);
if (handlerMappingKey != null) {
element.setChecked(handlerMappingKey.equals(commonMappingKey));
}
}
@SuppressWarnings("unchecked")
protected String commonMappingKey(IStructuredSelection selection) {
String commonKey = null;
for (Iterator stream = selection.iterator(); stream.hasNext(); ) {
Object obj = stream.next();
if (! (obj instanceof PersistentType)) {
return null;
}
PersistentType persistentType = (PersistentType) obj;
if (commonKey == null) {
commonKey = persistentType.getMappingKey();
}
else if (! commonKey.equals(persistentType.getMappingKey())) {
return null;
}
}
return commonKey;
}
}
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