/*
 * WorldEdit, a Minecraft world manipulation toolkit
 * Copyright (C) sk89q <http://www.sk89q.com>
 * Copyright (C) WorldEdit team and contributors
 *
 * This program is free software: you can redistribute it and/or modify it
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.sk89q.worldedit.function.visitor;

import java.util.Collection;

import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.function.RegionFunction;
import com.sk89q.worldedit.function.mask.Mask;
import com.sk89q.worldedit.function.operation.Operations;

/**
 * A {@link RecursiveVisitor} that goes orthogonally to the side and down, but never up.
 */
public class NonRisingVisitor extends RecursiveVisitor {
    
    /**
     * Create a new recursive visitor.
     *
     * @param mask the mask
     * @param function the function
     */
    public NonRisingVisitor(final Mask mask, final RegionFunction function) {
        super(mask, function);
        final Collection<Vector> directions = getDirections();
        directions.clear();
        directions.add(new Vector(1, 0, 0));
        directions.add(new Vector(-1, 0, 0));
        directions.add(new Vector(0, 0, 1));
        directions.add(new Vector(0, 0, -1));
        directions.add(new Vector(0, -1, 0));
    }
    
    public static Class<?> inject() {
        return Operations.class;
    }
    
}