org.eclipse.emf.diffmerge.ui.viewers.ModelScopeViewer.java Source code

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Here is the source code for org.eclipse.emf.diffmerge.ui.viewers.ModelScopeViewer.java

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/**
 * <copyright>
 * 
 * Copyright (c) 2010-2012 Thales Global Services S.A.S.
 * 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:
 *    Thales Global Services S.A.S. - initial API and implementation
 * 
 * </copyright>
 */
package org.eclipse.emf.diffmerge.ui.viewers;

import org.eclipse.emf.diffmerge.api.scopes.IModelScope;
import org.eclipse.emf.diffmerge.ui.util.DiffMergeLabelProvider;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;

/**
 * A viewer which provides a representation of a model scope.
 * Input: IModelScope ; Elements: EObject.
 * @author Olivier Constant
 */
public class ModelScopeViewer extends TreeViewer {

    /**
     * Constructor
     * @param parent_p a non-null composite
     */
    public ModelScopeViewer(Composite parent_p) {
        this(parent_p, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
    }

    /**
     * Constructor
     * @param parent_p a non-null composite
     * @param style_p a style for the tree
     */
    public ModelScopeViewer(Composite parent_p, int style_p) {
        super(parent_p, style_p);
        setContentProvider(new ContentProvider());
        setLabelProvider(DiffMergeLabelProvider.getInstance());
        getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    }

    /**
     * @see org.eclipse.jface.viewers.ContentViewer#getInput()
     */
    @Override
    public IModelScope getInput() {
        return (IModelScope) super.getInput();
    }

    /**
     * @see org.eclipse.jface.viewers.AbstractTreeViewer#getSelection()
     */
    @Override
    public ITreeSelection getSelection() {
        return (ITreeSelection) super.getSelection();
    }

    /**
     * The content provider for this viewer
     */
    protected class ContentProvider implements ITreeContentProvider {

        /**
         * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
         */
        public Object[] getChildren(Object parentElement_p) {
            return getInput().getContents((EObject) parentElement_p).toArray();
        }

        /**
         * @see org.eclipse.jface.viewers.ITreeContentProvider#getElements(java.lang.Object)
         */
        public Object[] getElements(Object inputElement_p) {
            return ((IModelScope) inputElement_p).getContents().toArray();
        }

        /**
         * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
         */
        public Object getParent(Object element_p) {
            return getInput().getContainer((EObject) element_p);
        }

        /**
         * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
         */
        public boolean hasChildren(Object element_p) {
            return !getInput().getContents((EObject) element_p).isEmpty();
        }

        /**
         * @see org.eclipse.jface.viewers.IContentProvider#dispose()
         */
        public void dispose() {
            // Nothing needed
        }

        /**
         * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
         */
        public void inputChanged(Viewer viewer_p, Object oldInput_p, Object newInput_p) {
            // Nothing needed
        }
    }

}