/*
 * JBoss, Home of Professional Open Source.
 *
 * See the LEGAL.txt file distributed with this work for information regarding copyright ownership and licensing.
 *
 * See the AUTHORS.txt file distributed with this work for a full listing of individual contributors.
 */
package org.teiid.designer.extension.ui.model;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.teiid.core.designer.util.ArrayUtil;
import org.teiid.designer.extension.ui.editors.ModelExtensionDefinitionEditor;


/**
 * 
 */
public class MedContentProvider implements ITreeContentProvider {

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.jface.viewers.IContentProvider#dispose()
     */
    @Override
    public void dispose() {
        // nothing to do
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
     */
    @Override
    public Object[] getChildren( Object parentElement ) {
        if (parentElement instanceof ModelExtensionDefinitionEditor) {
            return new Object[] { ((ModelExtensionDefinitionEditor)parentElement).getSelectionSynchronizer().getMedModelNode() };
        }

        if (parentElement instanceof MedModelNode) {
            return ((MedModelNode)parentElement).getChildren();
        }

        return ArrayUtil.Constants.EMPTY_ARRAY;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.jface.viewers.ITreeContentProvider#getElements(java.lang.Object)
     */
    @Override
    public Object[] getElements( Object inputElement ) {
        return getChildren(inputElement);
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
     */
    @Override
    public Object getParent( Object element ) {
        if (element instanceof MedModelNode) {
            return ((MedModelNode)element).getParent();
        }

        return null;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
     */
    @Override
    public boolean hasChildren( Object element ) {
        return (getChildren(element).length != 0);
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object,
     *      java.lang.Object)
     */
    @Override
    public void inputChanged( Viewer viewer,
                              Object oldInput,
                              Object newInput ) {
        // nothing to do
    }

}