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     * DirectJNgine is distributed in the hope that it will be useful,
011     * but WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013     * GNU General Public License for more details.
014     *
015     * You should have received a copy of the GNU General Public License
016     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
017     * 
018     * This software uses the ExtJs library (http://extjs.com), which is 
019     * distributed under the GPL v3 license (see http://extjs.com/license).
020     */
021    
022    package com.softwarementors.extjs.djn;
023    
024    import java.util.ArrayList;
025    import java.util.List;
026    
027    public final class StringUtils {
028      private StringUtils() {
029        // Disallow instantiation
030      }
031      
032      public static boolean isEmpty( String value ) {
033        return value == null || value.equals( "");
034      }
035    
036      public static String concatWithSeparator(List<String> missingParameters, String separator) {
037        assert missingParameters != null;
038        assert separator != null;
039        
040        if( missingParameters.isEmpty() ) {
041          return "";
042        }
043        
044        StringBuilder result = new StringBuilder();
045        for( int i = 0; i < missingParameters.size() - 1; i++) {
046          result.append( missingParameters.get(i));
047          result.append( separator );
048        }
049        
050        result.append( missingParameters.get( missingParameters.size() - 1));
051        
052        return result.toString();
053      }
054    
055      // Returns a list of strings form a 'delimiter' separated string.
056      // It removes whitespace from every value, and ignores empty strings
057      public static List<String> getNonBlankValues( String delimitedValues, String delimiter ) {
058        assert !StringUtils.isEmpty( delimitedValues );
059        assert !StringUtils.isEmpty(delimiter);
060        
061        List<String> result = new ArrayList<String>();
062        String[] values = delimitedValues.split( delimiter);
063        for( String value : values ) {
064          value = value.trim();
065          if( !value.equals( "")) {
066            result.add( value );
067          }
068        }
069        
070        return result;
071      }
072      
073    }