eu.esdihumboldt.hale.ui.schema.presets.internal.SchemaPresetContentProvider.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.schema.presets.internal.SchemaPresetContentProvider.java

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/*
 * Copyright (c) 2014 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.schema.presets.internal;

import java.util.ArrayList;
import java.util.List;

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

import com.google.common.collect.Iterables;

import eu.esdihumboldt.hale.common.schema.presets.extension.SchemaCategory;
import eu.esdihumboldt.hale.common.schema.presets.extension.SchemaCategoryExtension;
import eu.esdihumboldt.hale.common.schema.presets.extension.SchemaPreset;

/**
 * Content provider for the categorized schema presets.
 * 
 * @author Simon Templer
 */
public class SchemaPresetContentProvider implements ITreeContentProvider {

    private final boolean forceCategories = false;

    @Override
    public void dispose() {
        // do nothing
    }

    @Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        // do nothing
    }

    @Override
    public Object[] getElements(Object inputElement) {
        if (forceCategories) {
            return ArrayContentProvider.getInstance().getElements(inputElement);
        } else {
            // only show categories for categories with more than one child
            List<Object> result = new ArrayList<>();
            for (Object element : ArrayContentProvider.getInstance().getElements(inputElement)) {
                if (element instanceof SchemaCategory) {
                    SchemaCategory cat = (SchemaCategory) element;
                    if (SchemaCategoryExtension.DEFAULT_CATEGORY.equals(cat)) {
                        // add all schemas w/o category
                        Iterables.addAll(result, cat.getSchemas());
                    } else {
                        int numSchemas = Iterables.size(cat.getSchemas());
                        if (numSchemas > 1) {
                            // add category
                            result.add(cat);
                        } else if (numSchemas == 1) {
                            // add schemas
                            result.add(cat.getSchemas().iterator().next());
                        }
                    }
                } else
                    result.add(element);
            }
            return result.toArray();
        }
    }

    @Override
    public Object[] getChildren(Object parentElement) {
        if (parentElement instanceof SchemaCategory) {
            return Iterables.toArray(((SchemaCategory) parentElement).getSchemas(), Object.class);
        }
        return null;
    }

    @Override
    public Object getParent(Object element) {
        if (forceCategories) {
            if (element instanceof SchemaPreset) {
                return SchemaCategoryExtension.getInstance().get(((SchemaPreset) element).getCategoryId());
            }
        }
        return null;
    }

    @Override
    public boolean hasChildren(Object element) {
        if (element instanceof SchemaCategory) {
            return !Iterables.isEmpty(((SchemaCategory) element).getSchemas());
        }
        return false;
    }

}