/*
 * Copyright 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.gwt.gen2.table.event.client;

import com.google.gwt.gen2.event.logical.shared.*;
import com.google.gwt.gen2.table.event.client.TableEvent.*;

import java.util.*;

/**
 * Logical event fired when a cell is highlighted.
 */
public class RowSelectionEvent extends SelectionEvent<Set<Row>> {
    /**
     * Event Key for {@link RowSelectionEvent}.
     */
    public static final Type<RowSelectionEvent, RowSelectionHandler> TYPE = new Type<RowSelectionEvent, RowSelectionHandler>() {
        @Override
        protected void fire( RowSelectionHandler handler, RowSelectionEvent event ) {
            handler.onRowSelection( event );
        }
    };

    /**
     * Construct a new {@link RowSelectionEvent}.
     *
     * @param oldList the set of rows that were previously selected
     * @param newList the set of rows that are now selected
     */
    public RowSelectionEvent( Set<Row> oldList, Set<Row> newList ) {
        super( oldList, newList );
    }

    /**
     * @return the newly deselected rows
     */
    public Set<Row> getDeselectedRows() {
        Set<Row> deselected = new TreeSet<Row>();
        Set<Row> oldList = getOldValue();
        Set<Row> newList = getNewValue();
        for ( Row row : oldList ) {
            if ( !newList.contains( row ) ) {
                deselected.add( row );
            }
        }
        return deselected;
    }

    /**
     * @return the newly selected rows
     */
    public Set<Row> getSelectedRows() {
        Set<Row> selected = new TreeSet<Row>();
        Set<Row> oldList = getOldValue();
        Set<Row> newList = getNewValue();
        for ( Row row : newList ) {
            if ( !oldList.contains( row ) ) {
                selected.add( row );
            }
        }
        return selected;
    }

    @Override
    protected Type getType() {
        return TYPE;
    }
}