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Java example source code file (PLYParser.java)

This example Java source code file (PLYParser.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

bufferedreader, comment, element, end_header, field, format, ioexception, list, parseexception, plyparser, property, string, text, token, util, vector3d

The PLYParser.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.euclidean.threed;

import java.io.BufferedReader;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.StringTokenizer;

import org.apache.commons.math3.util.Precision;

/** This class is a small and incomplete parser for PLY files.
 * <p>
 * This parser is only intended for test purposes, it does not
 * parse the full header, it does not handle all properties,
 * it has rudimentary error handling.
 * </p>
 * @since 3.5
 */
public class PLYParser {

    /** Parsed vertices. */
    private Vector3D[] vertices;

    /** Parsed faces. */
    private int[][] faces;

    /** Reader for PLY data. */
    private BufferedReader br;

    /** Last parsed line. */
    private String line;

    /** Simple constructor.
     * @param stream stream to parse (closing it remains caller responsibility)
     * @exception IOException if stream cannot be read
     * @exception ParseException if stream content cannot be parsed
     */
    public PLYParser(final InputStream stream)
        throws IOException, ParseException {

        try {
            br = new BufferedReader(new InputStreamReader(stream, "UTF-8"));

            // parse the header
            List<Field> fields = parseNextLine();
            if (fields.size() != 1 || fields.get(0).getToken() != Token.PLY) {
                complain();
            }

            boolean parsing       = true;
            int nbVertices        = -1;
            int nbFaces           = -1;
            int xIndex            = -1;
            int yIndex            = -1;
            int zIndex            = -1;
            int vPropertiesNumber = -1;
            boolean inVertexElt   = false;
            boolean inFaceElt     = false;
            while (parsing) {
                fields = parseNextLine();
                if (fields.size() < 1) {
                    complain();
                }
                switch (fields.get(0).getToken()) {
                    case FORMAT:
                        if (fields.size() != 3 ||
                        fields.get(1).getToken() != Token.ASCII ||
                        fields.get(2).getToken() != Token.UNKNOWN ||
                        !Precision.equals(Double.parseDouble(fields.get(2).getValue()), 1.0, 0.001)) {
                            complain();
                        }
                        inVertexElt = false;
                        inFaceElt   = false;
                        break;
                    case COMMENT:
                        // we just ignore this line
                        break;
                    case ELEMENT:
                        if (fields.size() != 3 ||
                        (fields.get(1).getToken() != Token.VERTEX && fields.get(1).getToken() != Token.FACE) ||
                        fields.get(2).getToken() != Token.UNKNOWN) {
                            complain();
                        }
                        if (fields.get(1).getToken() == Token.VERTEX) {
                            nbVertices  = Integer.parseInt(fields.get(2).getValue());
                            inVertexElt = true;
                            inFaceElt   = false;
                        } else {
                            nbFaces     = Integer.parseInt(fields.get(2).getValue());
                            inVertexElt = false;
                            inFaceElt   = true;
                        }
                        break;
                    case PROPERTY:
                        if (inVertexElt) {
                            ++vPropertiesNumber;
                            if (fields.size() != 3 ||
                                (fields.get(1).getToken() != Token.CHAR   &&
                                 fields.get(1).getToken() != Token.UCHAR  &&
                                 fields.get(1).getToken() != Token.SHORT  &&
                                 fields.get(1).getToken() != Token.USHORT &&
                                 fields.get(1).getToken() != Token.INT    &&
                                 fields.get(1).getToken() != Token.UINT   &&
                                 fields.get(1).getToken() != Token.FLOAT  &&
                                 fields.get(1).getToken() != Token.DOUBLE)) {
                                complain();
                            }
                            if (fields.get(2).getToken() == Token.X) {
                                xIndex = vPropertiesNumber;
                            }else if (fields.get(2).getToken() == Token.Y) {
                                yIndex = vPropertiesNumber;
                            }else if (fields.get(2).getToken() == Token.Z) {
                                zIndex = vPropertiesNumber;
                            }
                        } else if (inFaceElt) {
                            if (fields.size() != 5 ||
                                fields.get(1).getToken()  != Token.LIST   &&
                                (fields.get(2).getToken() != Token.CHAR   &&
                                 fields.get(2).getToken() != Token.UCHAR  &&
                                 fields.get(2).getToken() != Token.SHORT  &&
                                 fields.get(2).getToken() != Token.USHORT &&
                                 fields.get(2).getToken() != Token.INT    &&
                                 fields.get(2).getToken() != Token.UINT) ||
                                (fields.get(3).getToken() != Token.CHAR   &&
                                 fields.get(3).getToken() != Token.UCHAR  &&
                                 fields.get(3).getToken() != Token.SHORT  &&
                                 fields.get(3).getToken() != Token.USHORT &&
                                 fields.get(3).getToken() != Token.INT    &&
                                 fields.get(3).getToken() != Token.UINT) ||
                                 fields.get(4).getToken() != Token.VERTEX_INDICES) {
                                complain();
                            }
                        } else {
                            complain();
                        }
                        break;
                    case END_HEADER:
                        inVertexElt = false;
                        inFaceElt   = false;
                        parsing     = false;
                        break;
                    default:
                        throw new ParseException("unable to parse line: " + line, 0);
                }
            }
            ++vPropertiesNumber;

            // parse vertices
            vertices = new Vector3D[nbVertices];
            for (int i = 0; i < nbVertices; ++i) {
                fields = parseNextLine();
                if (fields.size() != vPropertiesNumber ||
                    fields.get(xIndex).getToken() != Token.UNKNOWN ||
                    fields.get(yIndex).getToken() != Token.UNKNOWN ||
                    fields.get(zIndex).getToken() != Token.UNKNOWN) {
                    complain();
                }
                vertices[i] = new Vector3D(Double.parseDouble(fields.get(xIndex).getValue()),
                                           Double.parseDouble(fields.get(yIndex).getValue()),
                                           Double.parseDouble(fields.get(zIndex).getValue()));
            }

            // parse faces
            faces = new int[nbFaces][];
            for (int i = 0; i < nbFaces; ++i) {
                fields = parseNextLine();
                if (fields.isEmpty() ||
                    fields.size() != (Integer.parseInt(fields.get(0).getValue()) + 1)) {
                    complain();
                }
                faces[i] = new int[fields.size() - 1];
                for (int j = 0; j < faces[i].length; ++j) {
                    faces[i][j] = Integer.parseInt(fields.get(j + 1).getValue());
                }
            }

        } catch (NumberFormatException nfe) {
            complain();
        }
    }

    /** Complain about a bad line.
     * @exception ParseException always thrown
     */
    private void complain() throws ParseException {
        throw new ParseException("unable to parse line: " + line, 0);
    }

    /** Parse next line.
     * @return parsed fields
     * @exception IOException if stream cannot be read
     * @exception ParseException if the line does not contain the expected number of fields
     */
    private List<Field> parseNextLine()
        throws IOException, ParseException {
        final List<Field> fields = new ArrayList();
        line = br.readLine();
        if (line == null) {
            throw new EOFException();
        }
        final StringTokenizer tokenizer = new StringTokenizer(line);
        while (tokenizer.hasMoreTokens()) {
            fields.add(new Field(tokenizer.nextToken()));
        }
        return fields;
    }

    /** Get the parsed vertices.
     * @return parsed vertices
     */
    public List<Vector3D> getVertices() {
        return Arrays.asList(vertices);
    }

    /** Get the parsed faces.
     * @return parsed faces
     */
    public List<int[]> getFaces() {
        return Arrays.asList(faces);
    }

    /** Tokens from PLY files. */
    private static enum Token {
        PLY, FORMAT, ASCII, BINARY_BIG_ENDIAN, BINARY_LITTLE_ENDIAN,
        COMMENT, ELEMENT, VERTEX, FACE, PROPERTY, LIST, OBJ_INFO,
        CHAR, UCHAR, SHORT, USHORT, INT, UINT, FLOAT, DOUBLE,
        X, Y, Z, VERTEX_INDICES, END_HEADER, UNKNOWN;
    }

    /** Parsed line fields. */
    private static class Field {

        /** Token. */
        private final Token token;

        /** Value. */
        private final String value;

        /** Simple constructor.
         * @param value field value
         */
        public Field(final String value) {
            Token parsedToken = null;
            try {
                parsedToken = Token.valueOf(value.toUpperCase());
            } catch (IllegalArgumentException iae) {
                parsedToken = Token.UNKNOWN;
            }
            this.token = parsedToken;
            this.value = value;
        }

        /** Get the recognized token.
         * @return recognized token
         */
        public Token getToken() {
            return token;
        }

        /** Get the field value.
         * @return field value
         */
        public String getValue() {
            return value;
        }

    }

}

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