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Java example source code file (RegionDumper.java)

This example Java source code file (RegionDumper.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

arcsset, bsptree, circle, formatter, hyperplane, intervalsset, limitangle, orientedpoint, override, regiondumper, sphericalpolygonsset, string, stringbuilder, treedumper, util

The RegionDumper.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.partitioning;

import java.util.Formatter;
import java.util.Locale;

import org.apache.commons.math3.geometry.Space;
import org.apache.commons.math3.geometry.euclidean.oned.Euclidean1D;
import org.apache.commons.math3.geometry.euclidean.oned.IntervalsSet;
import org.apache.commons.math3.geometry.euclidean.oned.OrientedPoint;
import org.apache.commons.math3.geometry.euclidean.oned.Vector1D;
import org.apache.commons.math3.geometry.euclidean.threed.Euclidean3D;
import org.apache.commons.math3.geometry.euclidean.threed.Plane;
import org.apache.commons.math3.geometry.euclidean.threed.PolyhedronsSet;
import org.apache.commons.math3.geometry.euclidean.threed.Vector3D;
import org.apache.commons.math3.geometry.euclidean.twod.Euclidean2D;
import org.apache.commons.math3.geometry.euclidean.twod.Line;
import org.apache.commons.math3.geometry.euclidean.twod.PolygonsSet;
import org.apache.commons.math3.geometry.euclidean.twod.Vector2D;
import org.apache.commons.math3.geometry.spherical.oned.ArcsSet;
import org.apache.commons.math3.geometry.spherical.oned.LimitAngle;
import org.apache.commons.math3.geometry.spherical.oned.Sphere1D;
import org.apache.commons.math3.geometry.spherical.twod.Circle;
import org.apache.commons.math3.geometry.spherical.twod.Sphere2D;
import org.apache.commons.math3.geometry.spherical.twod.SphericalPolygonsSet;

/** Class dumping a string representation of an {@link AbstractRegion}.
 * <p>
 * This class is intended for tests and debug purposes only.
 * </p>
 * @see RegionParser
 * @since 3.5
 */
public class RegionDumper {

    /** Private constructor for a utility class
     */
    private RegionDumper() {
    }

    /** Get a string representation of an {@link ArcsSet}.
     * @param arcsSet region to dump
     * @return string representation of the region
     */
    public static String dump(final ArcsSet arcsSet) {
        final TreeDumper<Sphere1D> visitor = new TreeDumper("ArcsSet", arcsSet.getTolerance()) {

            /** {@inheritDoc} */
            @Override
            protected void formatHyperplane(final Hyperplane<Sphere1D> hyperplane) {
                final LimitAngle h = (LimitAngle) hyperplane;
                getFormatter().format("%22.15e %b %22.15e",
                                      h.getLocation().getAlpha(), h.isDirect(), h.getTolerance());
            }

        };
        arcsSet.getTree(false).visit(visitor);
        return visitor.getDump();
    }

    /** Get a string representation of a {@link SphericalPolygonsSet}.
     * @param sphericalPolygonsSet region to dump
     * @return string representation of the region
     */
    public static String dump(final SphericalPolygonsSet sphericalPolygonsSet) {
        final TreeDumper<Sphere2D> visitor = new TreeDumper("SphericalPolygonsSet", sphericalPolygonsSet.getTolerance()) {

            /** {@inheritDoc} */
            @Override
            protected void formatHyperplane(final Hyperplane<Sphere2D> hyperplane) {
                final Circle h = (Circle) hyperplane;
                getFormatter().format("%22.15e %22.15e %22.15e %22.15e",
                                      h.getPole().getX(), h.getPole().getY(), h.getPole().getZ(),
                                      h.getTolerance());
            }

        };
        sphericalPolygonsSet.getTree(false).visit(visitor);
        return visitor.getDump();
    }

    /** Get a string representation of an {@link IntervalsSet}.
     * @param intervalsSet region to dump
     * @return string representation of the region
     */
    public static String dump(final IntervalsSet intervalsSet) {
        final TreeDumper<Euclidean1D> visitor = new TreeDumper("IntervalsSet", intervalsSet.getTolerance()) {

            /** {@inheritDoc} */
            @Override
            protected void formatHyperplane(final Hyperplane<Euclidean1D> hyperplane) {
                final OrientedPoint h = (OrientedPoint) hyperplane;
                getFormatter().format("%22.15e %b %22.15e",
                                      h.getLocation().getX(), h.isDirect(), h.getTolerance());
            }

        };
        intervalsSet.getTree(false).visit(visitor);
        return visitor.getDump();
    }

    /** Get a string representation of a {@link PolygonsSet}.
     * @param polygonsSet region to dump
     * @return string representation of the region
     */
    public static String dump(final PolygonsSet polygonsSet) {
        final TreeDumper<Euclidean2D> visitor = new TreeDumper("PolygonsSet", polygonsSet.getTolerance()) {

            /** {@inheritDoc} */
            @Override
            protected void formatHyperplane(final Hyperplane<Euclidean2D> hyperplane) {
                final Line h = (Line) hyperplane;
                final Vector2D p = h.toSpace(Vector1D.ZERO);
                getFormatter().format("%22.15e %22.15e %22.15e %22.15e",
                                      p.getX(), p.getY(), h.getAngle(), h.getTolerance());
            }

        };
        polygonsSet.getTree(false).visit(visitor);
        return visitor.getDump();
    }

    /** Get a string representation of a {@link PolyhedronsSet}.
     * @param polyhedronsSet region to dump
     * @return string representation of the region
     */
    public static String dump(final PolyhedronsSet polyhedronsSet) {
        final TreeDumper<Euclidean3D> visitor = new TreeDumper("PolyhedronsSet", polyhedronsSet.getTolerance()) {

            /** {@inheritDoc} */
            @Override
            protected void formatHyperplane(final Hyperplane<Euclidean3D> hyperplane) {
                final Plane h = (Plane) hyperplane;
                final Vector3D p = h.toSpace(Vector2D.ZERO);
                getFormatter().format("%22.15e %22.15e %22.15e %22.15e %22.15e %22.15e %22.15e",
                                      p.getX(), p.getY(), p.getZ(),
                                      h.getNormal().getX(), h.getNormal().getY(), h.getNormal().getZ(),
                                      h.getTolerance());
            }

        };
        polyhedronsSet.getTree(false).visit(visitor);
        return visitor.getDump();
    }

    /** Dumping visitor.
     * @param <S> Type of the space.
     */
    private abstract static class TreeDumper<S extends Space> implements BSPTreeVisitor {

        /** Builder for the string representation of the dumped tree. */
        private final StringBuilder dump;

        /** Formatter for strings. */
        private final Formatter formatter;

        /** Current indentation prefix. */
        private String prefix;

        /** Simple constructor.
         * @param type type of the region to dump
         * @param tolerance tolerance of the region
         */
        public TreeDumper(final String type, final double tolerance) {
            this.dump      = new StringBuilder();
            this.formatter = new Formatter(dump, Locale.US);
            this.prefix    = "";
            formatter.format("%s%n", type);
            formatter.format("tolerance %22.15e%n", tolerance);
        }

        /** Get the string representation of the tree.
         * @return string representation of the tree.
         */
        public String getDump() {
            return dump.toString();
        }

        /** Get the formatter to use.
         * @return formatter to use
         */
        protected Formatter getFormatter() {
            return formatter;
        }

        /** Format a string representation of the hyperplane underlying a cut sub-hyperplane.
         * @param hyperplane hyperplane to format
         */
        protected abstract void formatHyperplane(Hyperplane<S> hyperplane);

        /** {@inheritDoc} */
        public Order visitOrder(final BSPTree<S> node) {
            return Order.SUB_MINUS_PLUS;
        }

        /** {@inheritDoc} */
        public void visitInternalNode(final BSPTree<S> node) {
            formatter.format("%s %s internal ", prefix, type(node));
            formatHyperplane(node.getCut().getHyperplane());
            formatter.format("%n");
            prefix = prefix + "  ";
        }

        /** {@inheritDoc} */
        public void visitLeafNode(final BSPTree<S> node) {
            formatter.format("%s %s leaf %s%n",
                             prefix, type(node), node.getAttribute());
            for (BSPTree<S> n = node;
                 n.getParent() != null && n == n.getParent().getPlus();
                 n = n.getParent()) {
                prefix = prefix.substring(0, prefix.length() - 2);
            }
        }

        /** Get the type of the node.
         * @param node node to check
         * @return "plus " or "minus" depending on the node being the plus or minus
         * child of its parent ("plus " is arbitrarily returned for the root node)
         */
        private String type(final BSPTree<S> node) {
            return (node.getParent() != null && node == node.getParent().getMinus()) ? "minus" : "plus ";
        }

    }

}

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