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.content;
31:
32: import java.util.Arrays;
33:
34: /**
35: * A class representing an operator of a content stream.
36: *
37: * <p>
38: * The content stream is a sequence of operations, with any operation beeing a
39: * list of operands followed by the operator.
40: * </p>
41: */
42: public class CSOperator {
43: /**
44: * The bytes that name the operator
45: */
46: private final byte[] token;
47:
48: /**
49: * A cache for the hash code
50: */
51: private int hash;
52:
53: public CSOperator(byte[] token) {
54: this .token = token;
55: }
56:
57: static public CSOperator create(String name) {
58: char[] chars = name.toCharArray();
59: byte[] bytes = new byte[chars.length];
60: for (int i = 0; i < chars.length; i++) {
61: bytes[i] = (byte) chars[i];
62: }
63: return new CSOperator(bytes);
64: }
65:
66: public byte[] getToken() {
67: return token;
68: }
69:
70: public boolean equals(Object o) {
71: if (this == o) {
72: return true;
73: }
74: if (!(o instanceof CSOperator)) {
75: return false;
76: }
77: return Arrays.equals(token, ((CSOperator) o).getToken());
78: }
79:
80: public int hashCode() {
81: int h = hash;
82: if (hash == 0) {
83: for (int i = 0; i < token.length; i++) {
84: h = (31 * h) + token[i];
85: }
86: hash = h;
87: }
88: return h;
89: }
90:
91: public String toString() {
92: return new String(token);
93: }
94: }
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