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Java example source code file (Vertex.java)

This example Java source code file (Vertex.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, circle, edge, s2point, util, vertex

The Vertex.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.math3.geometry.spherical.twod;

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

/** Spherical polygons boundary vertex.
 * @see SphericalPolygonsSet#getBoundaryLoops()
 * @see Edge
 * @since 3.3
 */
public class Vertex {

    /** Vertex location. */
    private final S2Point location;

    /** Incoming edge. */
    private Edge incoming;

    /** Outgoing edge. */
    private Edge outgoing;

    /** Circles bound with this vertex. */
    private final List<Circle> circles;

    /** Build a non-processed vertex not owned by any node yet.
     * @param location vertex location
     */
    Vertex(final S2Point location) {
        this.location = location;
        this.incoming = null;
        this.outgoing = null;
        this.circles  = new ArrayList<Circle>();
    }

    /** Get Vertex location.
     * @return vertex location
     */
    public S2Point getLocation() {
        return location;
    }

    /** Bind a circle considered to contain this vertex.
     * @param circle circle to bind with this vertex
     */
    void bindWith(final Circle circle) {
        circles.add(circle);
    }

    /** Get the common circle bound with both the instance and another vertex, if any.
     * <p>
     * When two vertices are both bound to the same circle, this means they are
     * already handled by node associated with this circle, so there is no need
     * to create a cut hyperplane for them.
     * </p>
     * @param vertex other vertex to check instance against
     * @return circle bound with both the instance and another vertex, or null if the
     * two vertices do not share a circle yet
     */
    Circle sharedCircleWith(final Vertex vertex) {
        for (final Circle circle1 : circles) {
            for (final Circle circle2 : vertex.circles) {
                if (circle1 == circle2) {
                    return circle1;
                }
            }
        }
        return null;
    }

    /** Set incoming edge.
     * <p>
     * The circle supporting the incoming edge is automatically bound
     * with the instance.
     * </p>
     * @param incoming incoming edge
     */
    void setIncoming(final Edge incoming) {
        this.incoming = incoming;
        bindWith(incoming.getCircle());
    }

    /** Get incoming edge.
     * @return incoming edge
     */
    public Edge getIncoming() {
        return incoming;
    }

    /** Set outgoing edge.
     * <p>
     * The circle supporting the outgoing edge is automatically bound
     * with the instance.
     * </p>
     * @param outgoing outgoing edge
     */
    void setOutgoing(final Edge outgoing) {
        this.outgoing = outgoing;
        bindWith(outgoing.getCircle());
    }

    /** Get outgoing edge.
     * @return outgoing edge
     */
    public Edge getOutgoing() {
        return outgoing;
    }

}

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