1 /* 2 Egothor Software License version 1.00 3 Copyright (C) 1997-2004 Leo Galambos. 4 Copyright (C) 2002-2004 "Egothor developers" 5 on behalf of the Egothor Project. 6 All rights reserved. 7 8 This software is copyrighted by the "Egothor developers". If this 9 license applies to a single file or document, the "Egothor developers" 10 are the people or entities mentioned as copyright holders in that file 11 or document. If this license applies to the Egothor project as a 12 whole, the copyright holders are the people or entities mentioned in 13 the file CREDITS. This file can be found in the same location as this 14 license in the distribution. 15 16 Redistribution and use in source and binary forms, with or without 17 modification, are permitted provided that the following conditions are 18 met: 19 1. Redistributions of source code must retain the above copyright 20 notice, the list of contributors, this list of conditions, and the 21 following disclaimer. 22 2. Redistributions in binary form must reproduce the above copyright 23 notice, the list of contributors, this list of conditions, and the 24 disclaimer that follows these conditions in the documentation 25 and/or other materials provided with the distribution. 26 3. The name "Egothor" must not be used to endorse or promote products 27 derived from this software without prior written permission. For 28 written permission, please contact Leo.G@seznam.cz 29 4. Products derived from this software may not be called "Egothor", 30 nor may "Egothor" appear in their name, without prior written 31 permission from Leo.G@seznam.cz. 32 33 In addition, we request that you include in the end-user documentation 34 provided with the redistribution and/or in the software itself an 35 acknowledgement equivalent to the following: 36 "This product includes software developed by the Egothor Project. 37 http://egothor.sf.net/" 38 39 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 40 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 41 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 42 IN NO EVENT SHALL THE EGOTHOR PROJECT OR ITS CONTRIBUTORS BE LIABLE 43 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 44 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 45 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 46 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 47 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 48 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 49 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 50 51 This software consists of voluntary contributions made by many 52 individuals on behalf of the Egothor Project and was originally 53 created by Leo Galambos (Leo.G@seznam.cz). 54 */ 55 package org.egothor.stemmer; 56 57 import java.util.ArrayList; 58 import java.util.Arrays; 59 import java.util.Iterator; 60 import java.util.List; 61 62 /** The Reduce object is used to remove gaps in a Trie which stores a dictionary. */ 63 public class Reduce { 64 65 /** Constructor for the Reduce object. */ Reduce()66 public Reduce() {} 67 68 /** 69 * Optimize (remove holes in the rows) the given Trie and return the restructured Trie. 70 * 71 * @param orig the Trie to optimize 72 * @return the restructured Trie 73 */ optimize(Trie orig)74 public Trie optimize(Trie orig) { 75 List<CharSequence> cmds = orig.cmds; 76 List<Row> rows = new ArrayList<>(); 77 List<Row> orows = orig.rows; 78 int[] remap = new int[orows.size()]; 79 80 Arrays.fill(remap, -1); 81 rows = removeGaps(orig.root, rows, new ArrayList<Row>(), remap); 82 83 return new Trie(orig.forward, remap[orig.root], cmds, rows); 84 } 85 removeGaps(int ind, List<Row> old, List<Row> to, int[] remap)86 List<Row> removeGaps(int ind, List<Row> old, List<Row> to, int[] remap) { 87 remap[ind] = to.size(); 88 89 Row now = old.get(ind); 90 to.add(now); 91 Iterator<Cell> i = now.cells.values().iterator(); 92 for (; i.hasNext(); ) { 93 Cell c = i.next(); 94 if (c.ref >= 0 && remap[c.ref] < 0) { 95 removeGaps(c.ref, old, to, remap); 96 } 97 } 98 to.set(remap[ind], new Remap(now, remap)); 99 return to; 100 } 101 102 /** This class is part of the Egothor Project */ 103 class Remap extends Row { 104 /** 105 * Constructor for the Remap object 106 * 107 * @param old Description of the Parameter 108 * @param remap Description of the Parameter 109 */ Remap(Row old, int[] remap)110 public Remap(Row old, int[] remap) { 111 super(); 112 Iterator<Character> i = old.cells.keySet().iterator(); 113 for (; i.hasNext(); ) { 114 Character ch = i.next(); 115 Cell c = old.at(ch); 116 Cell nc; 117 if (c.ref >= 0) { 118 nc = new Cell(c); 119 nc.ref = remap[nc.ref]; 120 } else { 121 nc = new Cell(c); 122 } 123 cells.put(ch, nc); 124 } 125 } 126 } 127 } 128