01: /*
02: * Copyright (c) 2007, intarsys consulting GmbH
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * - Redistributions of source code must retain the above copyright notice,
08: * this list of conditions and the following disclaimer.
09: *
10: * - Redistributions in binary form must reproduce the above copyright notice,
11: * this list of conditions and the following disclaimer in the documentation
12: * and/or other materials provided with the distribution.
13: *
14: * - Neither the name of intarsys nor the names of its contributors may be used
15: * to endorse or promote products derived from this software without specific
16: * prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28: * POSSIBILITY OF SUCH DAMAGE.
29: */
30: package de.intarsys.pdf.postscript;
31:
32: import java.util.Stack;
33:
34: public class Operator_roll implements IOperator {
35: public static Operator_roll Instance;
36:
37: static {
38: Instance = new Operator_roll();
39: }
40:
41: private Operator_roll() {
42: super ();
43: }
44:
45: public void execute(Stack stack) {
46: int elementCount;
47: int positionCount;
48: Object[] elements;
49:
50: positionCount = ((Integer) stack.pop()).intValue();
51: elementCount = ((Integer) stack.pop()).intValue();
52:
53: if (positionCount < 0) {
54: positionCount = elementCount + positionCount;
55: }
56:
57: elements = new Object[elementCount];
58: for (int index = positionCount - 1; index >= 0; index--) {
59: elements[index] = stack.pop();
60: }
61: for (int index = elementCount - 1; index >= positionCount; index--) {
62: elements[index] = stack.pop();
63: }
64: for (int index = 0; index < elementCount; index++) {
65: stack.push(elements[index]);
66: }
67: }
68: }
|