ScopeTools


1   /*
2    * Copyright (c) 2003, Inversoft
3    *
4    * This software is distribuable under the GNU Lesser General Public License.
5    * For more information visit gnu.org.
6    */
7   package com.inversoft.verge.util;
8   
9   
10  import javax.servlet.jsp.PageContext  ;
11  
12  
13  /**
14   * This class contains tools useful when dealing with scopes
15   * as integers and as Strings as well as conversions to JSP
16   * PageContext values.
17   *
18   * @author  Brian Pontarelli
19   * @since   2.0
20   * @version 2.0
21   */
22  public class ScopeTools {
23  
24      /**
25       * Not instantiable
26       */
27      private ScopeTools() {
28      }
29  
30  
31      /**
32       * Returns whether or not the given scope String is a valid Portal framework
33       * scope String
34       *
35       * @param   scope The scope String to check
36       * @return  True if the String is valid, false otherwise
37       */
38      public static boolean isValidScope(String   scope) {
39  
40          return (scope.equalsIgnoreCase(ScopeConstants.PAGE) ||
41              scope.equalsIgnoreCase(ScopeConstants.REQUEST) ||
42              scope.equalsIgnoreCase(ScopeConstants.SESSION) ||
43              scope.equalsIgnoreCase(ScopeConstants.APPLICATION));
44      }
45  
46      /**
47       * Returns whether or not the given scope int is a valid Portal framework
48       * scope int.
49       *
50       * @param   scope The scope int to check
51       * @return  True if the int is valid, false otherwise
52       */
53      public static boolean isValidScope(int scope) {
54  
55          return (scope >= ScopeConstants.PAGE_INT &&
56              scope <= ScopeConstants.APPLICATION_INT);
57      }
58  
59      /**
60       * Converts the given scope from a String to an int.
61       *
62       * @param   scope The scope string to convert
63       * @return  The scope as an int
64       * @throws  IllegalArgumentException If the int is not a valid scope int
65       */
66      public static int convertScope(String   scope) {
67  
68          if (scope.equalsIgnoreCase(ScopeConstants.PAGE)) {
69              return ScopeConstants.PAGE_INT;
70          } else if (scope.equalsIgnoreCase(ScopeConstants.REQUEST)) {
71              return ScopeConstants.REQUEST_INT;
72          } else if (scope.equalsIgnoreCase(ScopeConstants.SESSION)) {
73              return ScopeConstants.SESSION_INT;
74          } else if (scope.equalsIgnoreCase(ScopeConstants.APPLICATION)) {
75              return ScopeConstants.APPLICATION_INT;
76          }
77  
78          throw new IllegalArgumentException  ("Invalid Portal framework scope String");
79      }
80  
81      /**
82       * Converts the given scope from a int to an String.
83       *
84       * @param   scope The scope int to convert
85       * @return  The scope as an String
86       * @throws  IllegalArgumentException If the int is not a valid scope int
87       */
88      public static String   convertScope(int scope) {
89  
90          switch (scope) {
91              case ScopeConstants.PAGE_INT:
92                  return ScopeConstants.PAGE;
93              case ScopeConstants.REQUEST_INT:
94                  return ScopeConstants.REQUEST;
95              case ScopeConstants.SESSION_INT:
96                  return ScopeConstants.SESSION;
97              case ScopeConstants.APPLICATION_INT:
98                  return ScopeConstants.APPLICATION;
99          }
100 
101         throw new IllegalArgumentException  ("Invalid Portal framework scope int");
102     }
103 
104     /**
105      * Returns whether or not the given String denotes the PAGE scope. This
106      * check is done in a case INSENSTIVE manner.
107      *
108      * @param   scope The String to check
109      * @return  True if the String denotes the PAGE scope, false otherwise
110      */
111     public static boolean isPage(String   scope) {
112         return scope.equalsIgnoreCase(ScopeConstants.PAGE);
113     }
114 
115     /**
116      * Returns whether or not the given String denotes the REQUEST scope. This
117      * check is done in a case INSENSTIVE manner.
118      *
119      * @param   scope The String to check
120      * @return  True if the String denotes the REQUEST scope, false otherwise
121      */
122     public static boolean isRequest(String   scope) {
123         return scope.equalsIgnoreCase(ScopeConstants.REQUEST);
124     }
125 
126     /**
127      * Returns whether or not the given String denotes the SESSION scope. This
128      * check is done in a case INSENSTIVE manner.
129      *
130      * @param   scope The String to check
131      * @return  True if the String denotes the SESSION scope, false otherwise
132      */
133     public static boolean isSession(String   scope) {
134         return scope.equalsIgnoreCase(ScopeConstants.SESSION);
135     }
136 
137     /**
138      * Returns whether or not the given String denotes the APPLICATION scope. This
139      * check is done in a case INSENSTIVE manner.
140      *
141      * @param   scope The String to check
142      * @return  True if the String denotes the APPLICATION scope, false otherwise
143      */
144     public static boolean isApplication(String   scope) {
145         return scope.equalsIgnoreCase(ScopeConstants.APPLICATION);
146     }
147 
148     /**
149      * Converts the given Portal framework Scope int to a J2EE compliant scope
150      * value. These are retrieved from the javax.servlet.jsp.PageContext class.
151      *
152      * @param   scope The scope int to convert
153      * @return  The J2EE compliant scope value
154      * @throws  IllegalArgumentException If the int is not a valid scope int
155      */
156     public static int convertToJ2EE(int scope) {
157 
158         switch (scope) {
159             case ScopeConstants.PAGE_INT:
160                 return PageContext.PAGE_SCOPE;
161             case ScopeConstants.REQUEST_INT:
162                 return PageContext.REQUEST_SCOPE;
163             case ScopeConstants.SESSION_INT:
164                 return PageContext.SESSION_SCOPE;
165             case ScopeConstants.APPLICATION_INT:
166                 return PageContext.APPLICATION_SCOPE;
167         }
168 
169         throw new IllegalArgumentException  ("Invalid Portal framework scope int");
170     }
171 
172     /**
173      * Converts the given Portal framework Scope String to a J2EE compliant scope
174      * value. These are retrieved from the javax.servlet.jsp.PageContext class.
175      * This conversion happens in a case INSENSITIVE manner.
176      *
177      * @param   scope The scope String to convert
178      * @return  The J2EE compliant scope value
179      * @throws  IllegalArgumentException If the String is not a valid scope String
180      */
181     public static String   convertToJ2EE(String   scope) {
182 
183         if (scope.equalsIgnoreCase(ScopeConstants.PAGE)) {
184             return PageContext.PAGE;
185         } else if (scope.equalsIgnoreCase(ScopeConstants.REQUEST)) {
186             return PageContext.REQUEST;
187         } else if (scope.equalsIgnoreCase(ScopeConstants.SESSION)) {
188             return PageContext.SESSION;
189         } else if (scope.equalsIgnoreCase(ScopeConstants.APPLICATION)) {
190             return PageContext.APPLICATION;
191         }
192 
193         throw new IllegalArgumentException  ("Invalid Portal framework scope String");
194     }
195 
196     /**
197      * Converts the given Portal framework Scope int to a J2EE compliant scope
198      * value. These are retrieved from the javax.servlet.jsp.PageContext class.
199      *
200      * @param   scope The scope int to convert
201      * @return  The J2EE compliant scope value
202      * @throws  IllegalArgumentException If the int is not a valid scope int
203      */
204     public static int convertFromJ2EE(int scope) {
205 
206         switch (scope) {
207             case PageContext.PAGE_SCOPE:
208                 return ScopeConstants.PAGE_INT;
209             case PageContext.REQUEST_SCOPE:
210                 return ScopeConstants.REQUEST_INT;
211             case PageContext.SESSION_SCOPE:
212                 return ScopeConstants.SESSION_INT;
213             case PageContext.APPLICATION_SCOPE:
214                 return ScopeConstants.APPLICATION_INT;
215         }
216 
217         throw new IllegalArgumentException  ("Invalid Portal framework scope int");
218     }
219 
220     /**
221      * Converts the given Portal framework Scope String to a J2EE compliant scope
222      * value. These are retrieved from the javax.servlet.jsp.PageContext class.
223      * This conversion happens in a case INSENSITIVE manner.
224      *
225      * @param   scope The scope String to convert
226      * @return  The J2EE compliant scope value
227      * @throws  IllegalArgumentException If the String is not a valid scope String
228      */
229     public static String   convertFromJ2EE(String   scope) {
230 
231         if (scope.equalsIgnoreCase(PageContext.PAGE)) {
232             return ScopeConstants.PAGE;
233         } else if (scope.equalsIgnoreCase(PageContext.REQUEST)) {
234             return ScopeConstants.REQUEST;
235         } else if (scope.equalsIgnoreCase(PageContext.SESSION)) {
236             return ScopeConstants.SESSION;
237         } else if (scope.equalsIgnoreCase(PageContext.APPLICATION)) {
238             return ScopeConstants.APPLICATION;
239         }
240 
241         throw new IllegalArgumentException  ("Invalid Portal framework scope String");
242     }
243 
244     /**
245      * <p>
246      * Compares two scope strings and returns the value of their difference.
247      * </p>
248      *
249      * <p>
250      * The value returned is positive if scope1 has a larger scope than scope2
251      * and negative if scope1 has a smaller scope than scope2. Zero is returned
252      * if the scopes are equal. A larger scope is defined to have more visibility,
253      * which means that APPLICATION scope is larger than REQUEST scope and SESSION
254      * scope.
255      * </p>
256      *
257      * <p>
258      * NOTE: This method only works because the integer constants setup for
259      * scopes in GlobalConstants are sequential from REQUEST to APPLICATION
260      * starting with the value 0 and ending with the value 2.
261      * </p>
262      *
263      * @param   scope1 The first scope being compared
264      * @param   scope2 The second scope being compared
265      * @return  The result of the comparison
266      */
267     public static int compareScopes(String   scope1, String   scope2) {
268         int scope1Int = convertScope(scope1);
269         int scope2Int = convertScope(scope2);
270 
271         return scope1Int - scope2Int;
272     }
273 }
274
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