Android Open Source - ScalAR Util

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
  Copyright (C) 2010  Tobias Domhan//ww  w . j av a2  s .  c  om

    This file is part of AndObjViewer.

    AndObjViewer is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    AndObjViewer 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with AndObjViewer.  If not, see <http://www.gnu.org/licenses/>.
 
 */
package edu.dhbw.andobjviewer.parser;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

public class Util {
  
  private static final Pattern trimWhiteSpaces = Pattern.compile("[\\s]+");
  private static final Pattern removeInlineComments = Pattern.compile("#");
  private static final Pattern splitBySpace = Pattern.compile(" ");

  
  /**
   * returns a canonical line of a obj or mtl file.
   * e.g. it removes multiple whitespaces or comments from the given string.
   * @param line
   * @return
   */
  public static final String getCanonicalLine(String line) {
    line = trimWhiteSpaces.matcher(line).replaceAll(" ");
    if(line.contains("#")) {
      String[] parts = removeInlineComments.split(line);
      if(parts.length > 0)
        line = parts[0];//remove inline comments
    }
    return line;
  }
  public static String[] splitBySpace(String str) {
    return splitBySpace.split(str);
  }
  
  /**
   * Trims down obj files, so that they may be parsed faster later on.
   * Remove uneccessary whitespaces, comments etc.
   * @param in stream to be trimmed
   * @param out the resulting trimmed stream
   */
  public static void trim(BufferedReader in, BufferedWriter out) throws IOException {
    String line;
    out.write("#trimmed\n");
    for (line = in.readLine(); 
    line != null; 
    line = in.readLine()) {
      line = getCanonicalLine(line);
      if(line.length()>0) {
        out.write(line.trim());
        out.write('\n');
      }
    }
    in.close();
    out.close();
  }
  
    public final static List<String> fastSplit(final String text, char separator, final boolean emptyStrings) {
        final List<String> result = new ArrayList<String>();
        
        if (text != null && text.length() > 0) {
            int index1 = 0;
            int index2 = text.indexOf(separator);
            while (index2 >= 0) {
                String token = text.substring(index1, index2);
                result.add(token);
                index1 = index2 + 1;
                index2 = text.indexOf(separator, index1);
            }
            
            if (index1 < text.length() - 1) {
                result.add(text.substring(index1));
            }
        }//else: input unavailable
        
        return result;
    }
  
}

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