de.quamoco.adaptation.view.tasks.actions.AbstractViewHandler.java Source code

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Here is the source code for de.quamoco.adaptation.view.tasks.actions.AbstractViewHandler.java

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/*-------------------------------------------------------------------------+
|                                                                          |
| Copyright 2012 Technische Universitaet Muenchen and                      |
| Fraunhofer-Institut fuer Experimentelles Software Engineering (IESE)     |
|                                                                          |
| Licensed under the Apache License, Version 2.0 (the "License");          |
| you may not use this file except in compliance with the License.         |
| You may obtain a copy of the License at                                  |
|                                                                          |
|    http://www.apache.org/licenses/LICENSE-2.0                            |
|                                                                          |
| Unless required by applicable law or agreed to in writing, software      |
| distributed under the License is distributed on an "AS IS" BASIS,        |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and      |
| limitations under the License.                                           |
|                                                                          |
+-------------------------------------------------------------------------*/

package de.quamoco.adaptation.view.tasks.actions;

import java.util.LinkedList;
import java.util.List;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.handlers.HandlerUtil;

import de.quamoco.adaptation.model.status.AdaptationTask;
import de.quamoco.adaptation.view.tasks.AdaptationTasksView;

/**
 * An abstract super class for handlers dealing with the {@link AdaptationTasksView}
 * @author Franz Becker
 */
public abstract class AbstractViewHandler extends AbstractHandler {

    /**
     * Tries to return the {@link AdaptationTasksView} instance.
     * @param event the execution event
     * @return the instance of the {@link AdaptationTasksView}
     */
    public AdaptationTasksView getView(ExecutionEvent event) {
        IWorkbenchPart part = HandlerUtil.getActivePart(event);
        if (part instanceof AdaptationTasksView) {
            return (AdaptationTasksView) part;
        }
        return null;
    }

    /**
     * Returns all selected {@link AdaptationTask}s.
     * @param event the execution event.
     * @return the selected {@link AdaptationTask}s in the {@link AdaptationTasksView}
     */
    public List<AdaptationTask> getSelectedTasks(ExecutionEvent event) {
        final IStructuredSelection selection = (IStructuredSelection) HandlerUtil.getCurrentSelection(event);

        // iterate over selection and add adaptation tasks.
        LinkedList<AdaptationTask> taskList = new LinkedList<AdaptationTask>();
        for (Object selectedObject : selection.toArray()) {
            if (selectedObject instanceof AdaptationTask) {
                taskList.add((AdaptationTask) selectedObject);
            }
        }

        return taskList;
    }

    /**
     * Returns the selected {@link AdaptationTask}.
     * @param event the execution event
     * @return the first element in the current selection if it's an {@link AdaptationTask}
     */
    public AdaptationTask getSelectedTask(ExecutionEvent event) {
        final IStructuredSelection selection = (IStructuredSelection) HandlerUtil.getCurrentSelection(event);
        if (selection.getFirstElement() instanceof AdaptationTask) {
            return (AdaptationTask) selection.getFirstElement();
        }
        return null;
    }

}