ingo@1115: /*
ingo@1115:  * Copyright (c) 2010 by Intevation GmbH
ingo@1115:  *
ingo@1115:  * This program is free software under the LGPL (>=v2.1)
ingo@1115:  * Read the file LGPL.txt coming with the software for details
ingo@1115:  * or visit http://www.gnu.org/licenses/ if it does not exist.
ingo@1115:  */
ingo@1115: 
sascha@439: package de.intevation.gnv.utils;
sascha@439: 
sascha@439: /**
ingo@806:  * Helper class which supports some methods for working with strings.
ingo@806:  *
sascha@780:  * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
sascha@439:  */
sascha@439: public final class StringUtils
sascha@439: {
sascha@439:     private StringUtils() {
sascha@439:     }
sascha@439: 
ingo@806:     /**
ingo@806:      * Append a string to a string array.
ingo@806:      *
ingo@806:      * @param haystack String array.
ingo@806:      * @param straw String to append.
ingo@806:      * @return the new string array.
ingo@806:      */
sascha@439:     public static final String [] append(String [] haystack, String straw) {
sascha@439:         if (haystack == null) {
sascha@439:             return new String [] { straw };
sascha@439:         }
sascha@442:         String [] nhaystack = new String[haystack.length + 1];
sascha@439:         System.arraycopy(haystack, 0, nhaystack, 0, haystack.length);
sascha@439:         nhaystack[haystack.length] = straw;
sascha@439:         return nhaystack;
sascha@439:     }
sascha@439: 
ingo@806:     /**
ingo@806:      * Checks the existence of a string in a given string array.
ingo@806:      *
ingo@806:      * @param haystack String array.
ingo@806:      * @param needle String for being checked.
ingo@806:      * @return true, if the string is contained in <i>haystack</i> - else false.
ingo@806:      */
sascha@439:     public static final boolean contains(String [] haystack, String needle) {
sascha@439:         if (haystack == null) {
sascha@439:             return false;
sascha@439:         }
sascha@439: 
sascha@439:         if (needle == null) {
sascha@439:             for (int i = haystack.length - 1; i >= 0; --i) {
sascha@439:                 if (haystack[i] == null) {
sascha@439:                     return true;
sascha@439:                 }
sascha@439:             }
sascha@439:         }
sascha@439:         else {
sascha@439:             for (int i = haystack.length - 1; i >= 0; --i) {
sascha@439:                 String straw = haystack[i];
sascha@439:                 if (straw != null && straw.equals(needle)) {
sascha@439:                     return true;
sascha@439:                 }
sascha@439:             }
sascha@439:         }
sascha@439: 
sascha@439:         return false;
sascha@439:     }
sascha@439: }
sascha@798: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :