001    /*
002     * Copyright (C) 2010 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    
020    package org.crsh.cmdline.spi;
021    
022    import java.util.StringTokenizer;
023    
024    /**
025     * A typed string, this class should be extended to provide meta information about a string and provide type safety.
026     * This class is immutable and so should be its subclasses.
027     *
028     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
029     * @version $Revision$
030     */
031    public abstract class Value {
032    
033      public static class Properties extends Value {
034    
035        public Properties(String string) throws NullPointerException {
036          super(string);
037        }
038    
039        public java.util.Properties getProperties() {
040          java.util.Properties props = new java.util.Properties();
041          StringTokenizer tokenizer = new StringTokenizer(getString(), ";", false);
042          while(tokenizer.hasMoreTokens()){
043            String token = tokenizer.nextToken();
044            if(token.contains("=")) {
045              String key = token.substring(0, token.indexOf('='));
046              String value = token.substring(token.indexOf('=') + 1, token.length());
047              props.put(key, value);
048            }
049          }
050          return props;
051        }
052      }
053    
054      /** . */
055      private final String string;
056    
057      /**
058       * The only constructors that accepts a string.
059       *
060       * @param string the string value
061       * @throws NullPointerException if the string is null
062       */
063      public Value(String string) throws NullPointerException {
064        if (string == null) {
065          throw new NullPointerException("No null string accepted");
066        }
067        this.string = string;
068      }
069    
070      @Override
071      public int hashCode() {
072        return getClass().hashCode() ^ string.hashCode();
073      }
074    
075      @Override
076      public boolean equals(Object obj) {
077        if (obj == this) {
078          return true;
079        } else if (obj != null && obj.getClass().equals(getClass())) {
080          Value that = (Value)obj;
081          return string.equals(that.string);
082        }
083        return false;
084      }
085    
086      /**
087       * Returns the string value.
088       *
089       * @return the string value
090       */
091      public final String getString() {
092        return string;
093      }
094    
095      @Override
096      public final String toString() {
097        return string;
098      }
099    }