01: /**
02: * Copyright (c) 2005, www.pdfbox.org
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 met:
07: *
08: * 1. Redistributions of source code must retain the above copyright notice,
09: * this list of conditions and the following disclaimer.
10: * 2. 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: * 3. Neither the name of pdfbox; nor the names of its
14: * contributors may be used to endorse or promote products derived from this
15: * software without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20: * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
21: * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23: * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24: * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27: *
28: * http://www.pdfbox.org
29: *
30: */package org.pdfbox.util;
31:
32: import org.pdfbox.cos.COSDictionary;
33:
34: /**
35: * This class will be used for bit flag operations.
36: *
37: * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
38: * @version $Revision: 1.4 $
39: */
40: public class BitFlagHelper {
41: private BitFlagHelper() {
42: //helper class should not be constructed
43: }
44:
45: /**
46: * Sets the given boolean value at bitPos in the flags.
47: *
48: * @param dic The dictionary to set the value into.
49: * @param field The name of the field to set the value into.
50: * @param bitFlag the bit position to set the value in.
51: * @param value the value the bit position should have.
52: */
53: public static final void setFlag(COSDictionary dic, String field,
54: int bitFlag, boolean value) {
55: int currentFlags = dic.getInt(field, 0);
56: if (value) {
57: currentFlags = currentFlags | bitFlag;
58: } else {
59: currentFlags = currentFlags &= ~bitFlag;
60: }
61: dic.setInt(field, currentFlags);
62: }
63:
64: /**
65: * Gets the boolean value from the flags at the given bit
66: * position.
67: *
68: * @param dic The dictionary to get the field from.
69: * @param field The name of the field to get the flag from.
70: * @param bitFlag the bitPosition to get the value from.
71: *
72: * @return true if the number at bitPos is '1'
73: */
74: public static final boolean getFlag(COSDictionary dic,
75: String field, int bitFlag) {
76: int ff = dic.getInt(field, 0);
77: return (ff & bitFlag) == bitFlag;
78: }
79: }
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