Source code: ognl/DynamicSubscript.java
1 //--------------------------------------------------------------------------
2 // Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
3 // All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
7 // met:
8 //
9 // Redistributions of source code must retain the above copyright notice,
10 // this list of conditions and the following disclaimer.
11 // Redistributions in binary form must reproduce the above copyright
12 // notice, this list of conditions and the following disclaimer in the
13 // documentation and/or other materials provided with the distribution.
14 // Neither the name of the Drew Davidson nor the names of its contributors
15 // may be used to endorse or promote products derived from this software
16 // without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 // COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 // OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 // AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
28 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
29 // DAMAGE.
30 //--------------------------------------------------------------------------
31 package ognl;
32
33
34 /**
35 * This class has predefined instances that stand for OGNL's special "dynamic subscripts"
36 * for getting at the first, middle, or last elements of a list. In OGNL expressions,
37 * these subscripts look like special kinds of array indexes: [^] means the first element,
38 * [$] means the last, [|] means the middle, and [*] means the whole list.
39 * @author Luke Blanshard (blanshlu@netscape.net)
40 * @author Drew Davidson (drew@ognl.org)
41 */
42 public class DynamicSubscript
43 {
44 public static final int FIRST = 0;
45 public static final int MID = 1;
46 public static final int LAST = 2;
47 public static final int ALL = 3;
48
49 public static final DynamicSubscript first = new DynamicSubscript(FIRST);
50 public static final DynamicSubscript mid = new DynamicSubscript(MID);
51 public static final DynamicSubscript last = new DynamicSubscript(LAST);
52 public static final DynamicSubscript all = new DynamicSubscript(ALL);
53
54 private int flag;
55
56 private DynamicSubscript( int flag )
57 {
58 this.flag = flag;
59 }
60
61 public int getFlag()
62 {
63 return flag;
64 }
65
66 public String toString()
67 {
68 switch (flag)
69 {
70 case FIRST: return "^";
71 case MID: return "|";
72 case LAST: return "$";
73 case ALL: return "*";
74 default: return "?"; // Won't happen
75 }
76 }
77 }