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84 lines
2.2 KiB
84 lines
2.2 KiB
16 years ago
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package de.anomic.tools;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Set;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.plasma.parser.Word;
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// People make mistakes when they type words.
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// The most common mistakes are the four categories listed below:
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// (1) Changing one letter: bat / cat;
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// (2) Adding one letter: bat / boat;
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// (3) Deleting one letter: frog / fog; or
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// (4) Reversing two consecutive letters: two / tow.
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public class DidYouMean {
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private static char[] alphabet = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p',
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'q','r','s','t','u','v','w','x','y','z','ä','ö','ü','ß'};
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private final Set<String> set;
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private String word;
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private int len;
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private final plasmaSwitchboard sb;
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public DidYouMean(final plasmaSwitchboard env) {
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this.set = new HashSet<String>();
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this.word = "";
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this.len = 0;
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this.sb = env;
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}
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public Set<String> getSuggestion(String word) {
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this.word = word.toLowerCase();
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this.len = word.length();
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ChangingOneLetter();
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AddingOneLetter();
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DeletingOneLetter();
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ReversingTwoConsecutiveLetters();
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Iterator<String> it = this.set.iterator();
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String s;
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final HashSet<String> rset = new HashSet<String>();
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while(it.hasNext()) {
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s = it.next();
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if(sb.indexSegment.termIndex().has(Word.word2hash(s))) {
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rset.add(s);
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}
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}
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rset.remove(word.toLowerCase());
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return rset;
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}
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private void ChangingOneLetter() {
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for(int i=0; i<this.len; i++) {
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for(int j=0; j<alphabet.length; j++) {
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this.set.add(this.word.substring(0, i) + alphabet[j] + this.word.substring(i+1));
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}
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}
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}
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private void DeletingOneLetter() {
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for(int i=0; i<this.len;i++) {
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this.set.add(this.word.substring(0, i) + this.word.substring(i+1));
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}
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}
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private void AddingOneLetter() {
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for(int i=0; i<this.len;i++) {
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for(int j=0; j<alphabet.length; j++) {
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this.set.add(this.word.substring(0, i) + alphabet[j] + this.word.substring(i));
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}
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}
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}
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private void ReversingTwoConsecutiveLetters() {
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for(int i=0; i<this.word.length()-1; i++) {
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this.set.add(this.word.substring(0,i)+this.word.charAt(i+1)+this.word.charAt(i)+this.word.substring(i+2));
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}
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}
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}
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