company.ui.properties.CompanyLabelProvider.java Source code

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Here is the source code for company.ui.properties.CompanyLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2006 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 company.ui.properties;

import java.util.Iterator;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.PlatformUI;
import company.Employee;
import company.Team;
import company.presentation.CompanyEditor;

/**
 * Label provider for the title bar for the tabbed property sheet page.
 * @author Nguyen Viet Hoa
 *
 */
public class CompanyLabelProvider extends LabelProvider {

    private AdapterFactoryLabelProvider adapterFactoryLabelProvider;

    /**
     * @see org.eclipse.jface.viewers.ILabelProvider#getImage(java.lang.Object)
     */
    public Image getImage(Object element) {
        if (element == null || element.equals(StructuredSelection.EMPTY)) {
            return null;
        }
        if (element instanceof IStructuredSelection) {
            IStructuredSelection structuredSelection = (IStructuredSelection) element;
            if (areDifferentTypes(structuredSelection)) {
                return null;
            }
            element = structuredSelection.getFirstElement();
        }
        if (element instanceof EObject || element instanceof Resource) {
            return getAdapterFactoryLabelProvider().getImage(element);
        }
        return null;
    }

    /**
     * @see org.eclipse.jface.viewers.ILabelProvider#getText(java.lang.Object)
     */
    public String getText(Object element) {
        if (element == null || element.equals(StructuredSelection.EMPTY)) {
            return null;
        }
        int size = 1;
        if (element instanceof IStructuredSelection) {
            IStructuredSelection structuredSelection = (IStructuredSelection) element;
            if (areDifferentTypes(structuredSelection)) {
                return structuredSelection.size() + " items selected";//$NON-NLS-1$
            }
            element = structuredSelection.getFirstElement();
            size = structuredSelection.size();
        }
        if (element instanceof EObject) {
            String split[] = getAdapterFactoryLabelProvider().getText(element).split(" ");//$NON-NLS-1$
            StringBuffer type = new StringBuffer();
            StringBuffer name = new StringBuffer();
            for (int i = 0; i < split.length; i++) {
                if (i == 0) {
                    type.append('\u00AB');
                    type.append(split[i]);
                    if (!(element instanceof Employee)) {
                        type.append('\u00BB');
                    }
                } else if ((i == 1 && (element instanceof Employee))) {
                    type.append(' ');
                    type.append(split[i]);
                    type.append('\u00BB');
                } else {
                    name.append(split[i]);
                    name.append(' ');
                }
            }
            if (size == 1) {
                type.append(' ');
                type.append(name);
            } else {
                type.append(' ');
                type.append(Integer.toString(size));
                type.append(" selected");//$NON-NLS-1$
            }
            return type.toString();
        } else if (element instanceof Resource) {
            return "\u00ABResource\u00BB";//$NON-NLS-1$
        }
        return null;
    }

    /**
     * @return
     */
    private AdapterFactoryLabelProvider getAdapterFactoryLabelProvider() {
        if (adapterFactoryLabelProvider == null) {
            adapterFactoryLabelProvider = new AdapterFactoryLabelProvider(((CompanyEditor) PlatformUI.getWorkbench()
                    .getActiveWorkbenchWindow().getActivePage().getActiveEditor()).getAdapterFactory());
        }
        return adapterFactoryLabelProvider;
    }

    /**
     * Determine there are objects in the structured selection of different
     * types.
     * 
     * @param structuredSelection
     *            the structured selection.
     * @return true if there are objects of different types in the selection.
     */
    private boolean areDifferentTypes(IStructuredSelection structuredSelection) {
        if (structuredSelection.size() == 1) {
            return false;
        }
        Iterator i = structuredSelection.iterator();
        Object element = i.next();
        for (; i.hasNext();) {
            if (i.next().getClass() != element.getClass()) {
                return true;
            }
        }

        return false;
    }
}