org.eclipse.objectteams.otdt.internal.ui.handlers.OpenBindingEditorHandler.java Source code

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Here is the source code for org.eclipse.objectteams.otdt.internal.ui.handlers.OpenBindingEditorHandler.java

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/**********************************************************************
 * This file is part of "Object Teams Development Tooling"-Software
 * 
 * Copyright 2004, 2008 Fraunhofer Gesellschaft, Munich, Germany,
 * for its Fraunhofer Institute for Computer Architecture and Software
 * Technology (FIRST), Berlin, Germany and Technical University Berlin,
 * Germany.
 * 
 * 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
 * $Id$
 * 
 * Please visit http://www.eclipse.org/objectteams for updates and contact.
 * 
 * Contributors:
 * Fraunhofer FIRST - Initial API and implementation
 * Technical University Berlin - Initial API and implementation
 **********************************************************************/
package org.eclipse.objectteams.otdt.internal.ui.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IType;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.objectteams.otdt.core.IOTType;
import org.eclipse.objectteams.otdt.core.IRoleFileType;
import org.eclipse.objectteams.otdt.core.OTModelManager;
import org.eclipse.objectteams.otdt.internal.ui.bindingeditor.BindingEditorDialog;
import org.eclipse.ui.ISources;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * Handler responsible for the openBindingEditor command.
 * @author mosconi
 */
public class OpenBindingEditorHandler extends AbstractHandler {

    private IOTType currentTeam = null;

    public OpenBindingEditorHandler() {
    }

    /* (non-Javadoc)
     * @see org.eclipse.core.commands.AbstractHandler#setEnabled(java.lang.Object)
     */
    @Override
    public void setEnabled(Object evaluationContext) {
        ISelection selection = (ISelection) HandlerUtil.getVariable(evaluationContext,
                ISources.ACTIVE_CURRENT_SELECTION_NAME);
        currentTeam = getRootTeam(selection);
        if (currentTeam != null)
            setBaseEnabled(true);
        else
            setBaseEnabled(false);
    }

    /**
     * Opens the Binding Editor Dialog.
     */
    public Object execute(ExecutionEvent event) throws ExecutionException {
        IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);
        new BindingEditorDialog(window.getShell(), currentTeam).open();
        return null;
    }

    /**
     * Finds the outermost containing team for the given selection.
     * @param selection The current selection (can be null).
     * @return The best matching team for the selection, or null if no team found.
     */
    protected IOTType getRootTeam(ISelection selection) {
        IOTType selectedTeam = null;
        if (!(selection instanceof IStructuredSelection))
            return null;
        Object element = ((IStructuredSelection) selection).getFirstElement();
        if (!(element instanceof IJavaElement))
            return null;
        IJavaElement jElement = (IJavaElement) element;
        ICompilationUnit cu = (ICompilationUnit) jElement.getAncestor(IType.COMPILATION_UNIT);
        if (cu == null)
            return null;
        IType type = cu.findPrimaryType();
        IOTType otType = OTModelManager.getOTElement(type);
        if (otType == null)
            return null;
        if (otType.isTeam())
            selectedTeam = otType;
        else if (otType instanceof IRoleFileType)
            selectedTeam = ((IRoleFileType) otType).getTeam();
        return selectedTeam;
    }
}