cdmlib-persistence/src/main/java/eu/etaxonomy/cdm/persistence/query/MatchMode.java

   1 // $Id$
   2 /**
   3
   4 * Copyright (C) 2009 EDIT
   5 * European Distributed Institute of Taxonomy
   6 * http://www.e-taxonomy.eu
   7 *
   8 * The contents of this file are subject to the Mozilla Public License Version 1.1
   9 * See LICENSE.TXT at the top of this package for the full license terms.
  10 */
  11 package eu.etaxonomy.cdm.persistence.query;
  12
  13
  14 /**
  15  *
  16  *
  17  * @author a.babadshanjan
  18  * @created 03.03.2009
  19  * @version 1.0
  20  */
  21 public enum MatchMode {
  22
  23     /**
  24      * translates into <code>field = term</code>
  25      */
  26     EXACT("="),
  27     /**
  28      * translates into <code>field LIKE %term</code>
  29      */
  30     BEGINNING("LIKE"),
  31     /**
  32      * translates into <code>field LIKE %term%</code>
  33      */
  34     ANYWHERE("LIKE"),
  35     /**
  36      * translates into <code>field LIKE term%</code>
  37      */
  38     END("LIKE");
  39
  40     private static final char STAR_WILDCARD = '*';
  41     private static final char SQL_WILDCARD = '%';
  42     private String matchOperator;
  43     private final String wildcardStr = "" + SQL_WILDCARD;
  44
  45     MatchMode(String matchOperator){
  46         this.matchOperator = matchOperator;
  47     }
  48
  49     public String queryStringFrom(String queryString){
  50         if(queryString == null){
  51             return "";
  52         }
  53         queryString = queryString.replace(STAR_WILDCARD, SQL_WILDCARD);
  54         switch(this){
  55             case BEGINNING:
  56                 queryString = appendWildcard(queryString);
  57                 break;
  58             case END:
  59                 queryString = prependWildcard(queryString);
  60                 break;
  61             case ANYWHERE:
  62                 queryString = appendWildcard(queryString);
  63                 queryString = prependWildcard(queryString);
  64                 break;
  65         default:
  66             // Fall through for EXACT - Nothing to do //
  67             break;
  68         }
  69         return queryString;
  70     }
  71
  72     /**
  73      * @param queryString
  74      * @return
  75      */
  76     private String prependWildcard(String queryString) {
  77         if(!queryString.startsWith(wildcardStr)){
  78             queryString += wildcardStr;
  79         }
  80         return queryString;
  81     }
  82
  83     /**
  84      * @param queryString
  85      * @return
  86      */
  87     private String appendWildcard(String queryString) {
  88         if(!queryString.endsWith(wildcardStr)){
  89             queryString += wildcardStr;
  90         }
  91         return queryString;
  92     }
  93
  94     public String getMatchOperator(){
  95         return matchOperator;
  96     }
  97 }