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1
16
17 package org.apache.taglibs.standard.functions;
18
19 import java.lang.reflect.Array  ;
20 import java.util.Collection ;
21 import java.util.Enumeration ;
22 import java.util.Iterator ;
23 import java.util.Map ;
24 import java.util.StringTokenizer ;
25
26 import javax.servlet.jsp.JspTagException ;
27
28 import org.apache.taglibs.standard.resources.Resources;
29 import org.apache.taglibs.standard.tag.common.core.Util;
30
31
36
37 public class Functions {
38
39
42
45 public static String toUpperCase(String input) {
46 return input.toUpperCase();
47 }
48
49
52 public static String toLowerCase(String input) {
53 return input.toLowerCase();
54 }
55
56
59 public static int indexOf(String input, String substring) {
60 if (input == null) input = "";
61 if (substring == null) substring = "";
62 return input.indexOf(substring);
63 }
64
65 public static boolean contains(String input, String substring) {
66 return indexOf(input, substring) != -1;
67 }
68
69 public static boolean containsIgnoreCase(String input, String substring) {
70 if (input == null) input = "";
71 if (substring == null) substring = "";
72 String inputUC = input.toUpperCase();
73 String substringUC = substring.toUpperCase();
74 return indexOf(inputUC, substringUC) != -1;
75 }
76
77 public static boolean startsWith(String input, String substring) {
78 if (input == null) input = "";
79 if (substring == null) substring = "";
80 return input.startsWith(substring);
81 }
82
83 public static boolean endsWith(String input, String substring) {
84 if (input == null) input = "";
85 if (substring == null) substring = "";
86 int index = input.lastIndexOf(substring);
87 if (index == -1) return false;
88 if (index == 0 && substring.length() == 0) return true;
89 return (index == input.length() - substring.length());
90 }
91
92 public static String substring(String input, int beginIndex, int endIndex) {
93 if (input == null) input = "";
94 if (beginIndex >= input.length()) return "";
95 if (beginIndex < 0) beginIndex = 0;
96 if (endIndex < 0 || endIndex > input.length()) endIndex = input.length();
97 if (endIndex < beginIndex) return "";
98 return input.substring(beginIndex, endIndex);
99 }
100
101 public static String substringAfter(String input, String substring) {
102 if (input == null) input = "";
103 if (input.length() == 0) return "";
104 if (substring == null) substring = "";
105 if (substring.length() == 0) return input;
106
107 int index = input.indexOf(substring);
108 if (index == -1) {
109 return "";
110 } else {
111 return input.substring(index+substring.length());
112 }
113 }
114
115 public static String substringBefore(String input, String substring) {
116 if (input == null) input = "";
117 if (input.length() == 0) return "";
118 if (substring == null) substring = "";
119 if (substring.length() == 0) return "";
120
121 int index = input.indexOf(substring);
122 if (index == -1) {
123 return "";
124 } else {
125 return input.substring(0, index);
126 }
127 }
128
129
132 public static String escapeXml(String input) {
133 if (input == null) return "";
134 return Util.escapeXml(input);
135 }
136
137 public static String trim(String input) {
138 if (input == null) return "";
139 return input.trim();
140 }
141
142 public static String replace(
143 String input,
144 String substringBefore,
145 String substringAfter)
146 {
147 if (input == null) input = "";
148 if (input.length() == 0) return "";
149 if (substringBefore == null) substringBefore = "";
150 if (substringBefore.length() == 0) return input;
151
152 StringBuffer buf = new StringBuffer (input.length());
153 int startIndex = 0;
154 int index;
155 while ((index = input.indexOf(substringBefore, startIndex)) != -1) {
156 buf.append(input.substring(startIndex, index)).append(substringAfter);
157 startIndex = index + substringBefore.length();
158 }
159 return buf.append(input.substring(startIndex)).toString();
160 }
161
162 public static String [] split(
163 String input,
164 String delimiters)
165 {
166 String [] array;
167 if (input == null) input = "";
168 if (input.length() == 0) {
169 array = new String [1];
170 array[0] = "";
171 return array;
172 }
173
174 if (delimiters == null) delimiters = "";
175
176 StringTokenizer tok = new StringTokenizer (input, delimiters);
177 int count = tok.countTokens();
178 array = new String [count];
179 int i = 0;
180 while (tok.hasMoreTokens()) {
181 array[i++] = tok.nextToken();
182 }
183 return array;
184 }
185
186
189 public static int length(Object obj) throws JspTagException {
190 if (obj == null) return 0;
191
192 if (obj instanceof String ) return ((String )obj).length();
193 if (obj instanceof Collection ) return ((Collection )obj).size();
194 if (obj instanceof Map ) return ((Map )obj).size();
195
196 int count = 0;
197 if (obj instanceof Iterator ) {
198 Iterator iter = (Iterator )obj;
199 count = 0;
200 while (iter.hasNext()) {
201 count++;
202 iter.next();
203 }
204 return count;
205 }
206 if (obj instanceof Enumeration ) {
207 Enumeration enum_ = (Enumeration )obj;
208 count = 0;
209 while (enum_.hasMoreElements()) {
210 count++;
211 enum_.nextElement();
212 }
213 return count;
214 }
215 try {
216 count = Array.getLength(obj);
217 return count;
218 } catch (IllegalArgumentException ex) {}
219 throw new JspTagException (Resources.getMessage("PARAM_BAD_VALUE"));
220 }
221
222 public static String join(String [] array, String separator) {
223 if (array == null) return "";
224 if (separator == null) separator = "";
225
226 StringBuffer buf = new StringBuffer ();
227 for (int i=0; i<array.length; i++) {
228 buf.append(array[i]);
229 if (i < array.length-1) buf.append(separator);
230 }
231
232 return buf.toString();
233 }
234 }
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