01: /*
02: * This file is part of PFIXCORE.
03: *
04: * PFIXCORE is free software; you can redistribute it and/or modify
05: * it under the terms of the GNU Lesser General Public License as published by
06: * the Free Software Foundation; either version 2 of the License, or
07: * (at your option) any later version.
08: *
09: * PFIXCORE is distributed in the hope that it will be useful,
10: * but WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12: * GNU Lesser General Public License for more details.
13: *
14: * You should have received a copy of the GNU Lesser General Public License
15: * along with PFIXCORE; if not, write to the Free Software
16: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17: */
18:
19: package de.schlund.pfixcore.scriptedflow.compiler;
20:
21: import de.schlund.pfixcore.scriptedflow.vm.Instruction;
22: import de.schlund.pfixcore.scriptedflow.vm.JumpCondFalseInstruction;
23: import de.schlund.pfixcore.scriptedflow.vm.JumpUncondInstruction;
24: import de.schlund.pfixcore.scriptedflow.vm.NopInstruction;
25:
26: /**
27: * Execute the statements within the block until the conditions
28: * becomes false or a break statement is executed
29: *
30: * @author Sebastian Marsching <sebastian.marsching@1und1.de>
31: */
32: public class WhileStatement extends AbstractStatement {
33: private String condition;
34: private Statement child;
35:
36: private Instruction jumpInstr = null;
37: private Instruction backInstr = null;
38: private Instruction finalInstr = new NopInstruction();
39:
40: public WhileStatement(Statement parent) {
41: super (parent);
42: }
43:
44: public Instruction[] getInstructions() {
45: if (jumpInstr == null) {
46: jumpInstr = new JumpCondFalseInstruction(condition,
47: finalInstr);
48: backInstr = new JumpUncondInstruction(jumpInstr);
49: }
50: Instruction[] temp = child.getInstructions();
51: Instruction[] temp2 = new Instruction[temp.length + 3];
52: temp2[0] = jumpInstr;
53: temp2[temp2.length - 2] = backInstr;
54: temp2[temp2.length - 1] = finalInstr;
55: for (int i = 0; i < temp.length; i++) {
56: temp2[i + 1] = temp[i];
57: }
58: return temp2;
59: }
60:
61: public void setCondition(String condition) {
62: this .condition = condition;
63: }
64:
65: public void setChild(Statement child) {
66: this .child = child;
67: }
68:
69: Instruction getFinalInstruction() {
70: return finalInstr;
71: }
72:
73: }
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