eu.esdihumboldt.hale.ui.style.handler.TypeStyleHandler.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.style.handler.TypeStyleHandler.java

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/*
 * Copyright (c) 2012 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:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.style.handler;

import java.util.Map.Entry;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.SetMultimap;

import eu.esdihumboldt.hale.common.align.model.EntityDefinition;
import eu.esdihumboldt.hale.common.instance.model.DataSet;
import eu.esdihumboldt.hale.common.instance.model.Instance;
import eu.esdihumboldt.hale.common.instance.model.InstanceReference;
import eu.esdihumboldt.hale.common.schema.SchemaSpaceID;
import eu.esdihumboldt.hale.common.schema.model.TypeDefinition;
import eu.esdihumboldt.hale.ui.service.instance.InstanceService;
import eu.esdihumboldt.hale.ui.service.schema.SchemaService;
import eu.esdihumboldt.hale.ui.style.DataSetTypeSelectionDialog;
import eu.esdihumboldt.hale.ui.style.dialog.FeatureStyleDialog;
import eu.esdihumboldt.util.Pair;

/**
 * Shows a {@link FeatureStyleDialog} for a selected {@link TypeDefinition} or
 * entity definition that represents a type.
 * 
 * @author Simon Templer
 */
public class TypeStyleHandler extends AbstractHandler {

    /**
     * @see IHandler#execute(ExecutionEvent)
     */
    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {

        // collect types and associated data sets
        SetMultimap<DataSet, TypeDefinition> types = collectTypesFromSelection(event);

        Pair<TypeDefinition, DataSet> typeInfo = null;

        // select a type
        if (types.size() == 1) {
            Entry<DataSet, TypeDefinition> entry = types.entries().iterator().next();
            typeInfo = new Pair<TypeDefinition, DataSet>(entry.getValue(), entry.getKey());
        } else if (!types.isEmpty()) {
            // choose through dialog
            DataSetTypeSelectionDialog dialog = new DataSetTypeSelectionDialog(
                    Display.getCurrent().getActiveShell(), "Multiple types: select which to change the style for",
                    null, types);
            if (dialog.open() == DataSetTypeSelectionDialog.OK) {
                typeInfo = dialog.getObject();
            }
        }

        if (typeInfo != null) {
            try {
                FeatureStyleDialog dialog = new FeatureStyleDialog(typeInfo.getFirst(), typeInfo.getSecond());
                dialog.setBlockOnOpen(false);
                dialog.open();
            } catch (Exception e) {
                throw new ExecutionException("Could not open style dialog", e);
            }
        }
        return null;
    }

    /**
     * Determine which data set a type represents.
     * 
     * @param type the type definition
     * @return the data set
     */
    private static DataSet findDataSet(TypeDefinition type) {
        SchemaService ss = PlatformUI.getWorkbench().getService(SchemaService.class);
        if (ss.getSchemas(SchemaSpaceID.SOURCE).getMappingRelevantTypes().contains(type)) {
            return DataSet.SOURCE;
        }
        if (ss.getSchemas(SchemaSpaceID.TARGET).getMappingRelevantTypes().contains(type)) {
            return DataSet.TRANSFORMED;
        }

        // default to source
        return DataSet.SOURCE;
    }

    /**
     * Collect all type definitions and data sets from the current selection of
     * {@link TypeDefinition}s, {@link EntityDefinition}s, {@link Instance}s and
     * {@link InstanceReference}s.
     * 
     * @param event the handler execution event
     * @return the collected type definitions
     */
    public static SetMultimap<DataSet, TypeDefinition> collectTypesFromSelection(ExecutionEvent event) {
        SetMultimap<DataSet, TypeDefinition> types = HashMultimap.create();
        ISelection selection = HandlerUtil.getCurrentSelection(event);
        if (selection instanceof IStructuredSelection && !selection.isEmpty()) {
            for (Object object : ((IStructuredSelection) selection).toArray()) {
                if (object instanceof TypeDefinition) {
                    TypeDefinition type = (TypeDefinition) object;
                    if (!types.containsValue(type)) {
                        DataSet dataSet = findDataSet(type);
                        types.put(dataSet, type);
                    }
                }
                if (object instanceof EntityDefinition) {
                    EntityDefinition entityDef = (EntityDefinition) object;
                    if (entityDef.getPropertyPath().isEmpty()) {
                        DataSet dataSet = (entityDef.getSchemaSpace() == SchemaSpaceID.SOURCE) ? (DataSet.SOURCE)
                                : (DataSet.TRANSFORMED);
                        types.put(dataSet, entityDef.getType());
                    }
                }
                if (object instanceof InstanceReference) {
                    InstanceService is = HandlerUtil.getActiveWorkbenchWindow(event).getWorkbench()
                            .getService(InstanceService.class);
                    object = is.getInstance((InstanceReference) object);
                }
                if (object instanceof Instance) {
                    Instance instance = (Instance) object;
                    types.put(instance.getDataSet(), instance.getDefinition());
                }
            }
        }
        return types;
    }

}