001    /*
002     * Copyright © 2008, 2012 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 Lesser 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 Lesser General Public License for more details.
018     *
019     * You should have received a copy of the GNU Lesser 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    import java.util.Locale;
031    
032    public final class StringUtils {
033      private StringUtils() {
034        // Disallow instantiation
035      }
036      
037      public static boolean isEmpty( String value ) {
038        return value == null || value.equals( "");
039      }
040    
041      public static String concatWithSeparator(List<String> missingParameters, String separator) {
042        assert missingParameters != null;
043        assert separator != null;
044        
045        if( missingParameters.isEmpty() ) {
046          return "";
047        }
048        
049        StringBuilder result = new StringBuilder();
050        for( int i = 0; i < missingParameters.size() - 1; i++) {
051          result.append( missingParameters.get(i));
052          result.append( separator );
053        }
054        
055        result.append( missingParameters.get( missingParameters.size() - 1));
056        
057        return result.toString();
058      }
059    
060      // Returns a list of strings form a 'delimiter' separated string.
061      // It removes whitespace from every value, and ignores empty strings
062      public static List<String> getNonBlankValues( String delimitedValues, String delimiter ) {
063        assert !StringUtils.isEmpty( delimitedValues );
064        assert !StringUtils.isEmpty(delimiter);
065        
066        List<String> result = new ArrayList<String>();
067        String[] values = delimitedValues.split( delimiter);
068        for( String value : values ) {
069          value = value.trim();
070          if( !value.equals( "")) {
071            result.add( value );
072          }
073        }
074        
075        return result;
076      }
077      
078      public static boolean startsWithCaseInsensitive( String s1, String s2) {
079        assert s2 != null;
080    
081        if( s1 == null ) {
082          return false;
083        }
084        String s1lower = s1.toLowerCase(Locale.getDefault());
085        String s2lower = s2.toLowerCase(Locale.getDefault());
086        return s1lower.startsWith(s2lower);
087      }
088    }