001    /*
002     * Copyright © 2008, 2009 Pedro Agulló Soliveres.
003     * 
004     * This file is part of DirectJNgine.
005     *
006     * DirectJNgine is free software: you can redistribute it and/or modify
007     * it under the terms of the GNU General Public License as published by
008     * the Free Software Foundation, either version 3 of the License.
009     *
010     * Commercial use is permitted to the extent that the code/component(s)
011     * do NOT become part of another Open Source or Commercially developed
012     * licensed development library or toolkit without explicit permission.
013     *
014     * DirectJNgine is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017     * GNU General Public License for more details.
018     *
019     * You should have received a copy of the GNU General Public License
020     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
021     * 
022     * This software uses the ExtJs library (http://extjs.com), which is 
023     * distributed under the GPL v3 license (see http://extjs.com/license).
024     */
025    
026    package com.softwarementors.extjs.djn;
027    
028    import java.util.ArrayList;
029    import java.util.List;
030    
031    public final class StringUtils {
032      private StringUtils() {
033        // Disallow instantiation
034      }
035      
036      public static boolean isEmpty( String value ) {
037        return value == null || value.equals( "");
038      }
039    
040      public static String concatWithSeparator(List<String> missingParameters, String separator) {
041        assert missingParameters != null;
042        assert separator != null;
043        
044        if( missingParameters.isEmpty() ) {
045          return "";
046        }
047        
048        StringBuilder result = new StringBuilder();
049        for( int i = 0; i < missingParameters.size() - 1; i++) {
050          result.append( missingParameters.get(i));
051          result.append( separator );
052        }
053        
054        result.append( missingParameters.get( missingParameters.size() - 1));
055        
056        return result.toString();
057      }
058    
059      // Returns a list of strings form a 'delimiter' separated string.
060      // It removes whitespace from every value, and ignores empty strings
061      public static List<String> getNonBlankValues( String delimitedValues, String delimiter ) {
062        assert !StringUtils.isEmpty( delimitedValues );
063        assert !StringUtils.isEmpty(delimiter);
064        
065        List<String> result = new ArrayList<String>();
066        String[] values = delimitedValues.split( delimiter);
067        for( String value : values ) {
068          value = value.trim();
069          if( !value.equals( "")) {
070            result.add( value );
071          }
072        }
073        
074        return result;
075      }
076      
077    }