01: //--------------------------------------------------------------------------
02: // Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
03: // All rights reserved.
04: //
05: // Redistribution and use in source and binary forms, with or without
06: // modification, are permitted provided that the following conditions are
07: // met:
08: //
09: // 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: * This class has predefined instances that stand for OGNL's special "dynamic subscripts"
35: * for getting at the first, middle, or last elements of a list. In OGNL expressions,
36: * these subscripts look like special kinds of array indexes: [^] means the first element,
37: * [$] means the last, [|] means the middle, and [*] means the whole list.
38: * @author Luke Blanshard (blanshlu@netscape.net)
39: * @author Drew Davidson (drew@ognl.org)
40: */
41: public class DynamicSubscript {
42: public static final int FIRST = 0;
43: public static final int MID = 1;
44: public static final int LAST = 2;
45: public static final int ALL = 3;
46:
47: public static final DynamicSubscript first = new DynamicSubscript(
48: FIRST);
49: public static final DynamicSubscript mid = new DynamicSubscript(MID);
50: public static final DynamicSubscript last = new DynamicSubscript(
51: LAST);
52: public static final DynamicSubscript all = new DynamicSubscript(ALL);
53:
54: private int flag;
55:
56: private DynamicSubscript(int flag) {
57: this .flag = flag;
58: }
59:
60: public int getFlag() {
61: return flag;
62: }
63:
64: public String toString() {
65: switch (flag) {
66: case FIRST:
67: return "^";
68: case MID:
69: return "|";
70: case LAST:
71: return "$";
72: case ALL:
73: return "*";
74: default:
75: return "?"; // Won't happen
76: }
77: }
78: }
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