eu.esdihumboldt.hale.ui.functions.groovy.internal.HelperFunctionContentProvider.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.functions.groovy.internal.HelperFunctionContentProvider.java

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/*
 * Copyright (c) 2015 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.functions.groovy.internal;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

import com.google.common.collect.Iterables;

import eu.esdihumboldt.cst.functions.groovy.helper.Category;
import eu.esdihumboldt.cst.functions.groovy.helper.HelperFunctionOrCategory;
import eu.esdihumboldt.cst.functions.groovy.helper.HelperFunctionsService;

/**
 * Content provider for a helper function
 * 
 * @author sameer sheikh
 */
public class HelperFunctionContentProvider implements ITreeContentProvider {

    private final HelperFunctionsService helperFunctionService;

    /**
     * Parameterized constructor
     * 
     * @param functions helper function service
     */
    public HelperFunctionContentProvider(HelperFunctionsService functions) {
        this.helperFunctionService = functions;
    }

    /**
     * @see org.eclipse.jface.viewers.IContentProvider#dispose()
     */
    @Override
    public void dispose() {
        // Do nothing

    }

    /**
     * @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) {
        // Do nothing

    }

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

        if (inputElement instanceof Category) {
            Iterable<HelperFunctionOrCategory> x = helperFunctionService.getChildren((Category) inputElement);
            return Iterables.toArray(x, HelperFunctionOrCategory.class);

        }

        return null;
    }

    /**
     * @see ITreeContentProvider#getChildren(Object)
     */
    @Override
    public Object[] getChildren(Object parentElement) {

        return getElements(parentElement);
    }

    /**
     * @see ITreeContentProvider#getParent(Object)
     */
    @Override
    public Object getParent(Object element) {
        if (element instanceof Category) {
            return ((Category) element).getParent();
        }

        return null;
    }

    /**
     * @see ITreeContentProvider#hasChildren(Object)
     */
    @Override
    public boolean hasChildren(Object element) {
        Object[] children = getChildren(element);
        return children != null && children.length > 0;
    }
}