01: /*
02: * Copyright 1999-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: /*
17: * $Id: XMLCharacterRecognizer.java,v 1.8 2005/01/23 01:02:10 mcnamara Exp $
18: */
19: package org.apache.xml.utils;
20:
21: /**
22: * Class used to verify whether the specified <var>ch</var>
23: * conforms to the XML 1.0 definition of whitespace.
24: * @xsl.usage internal
25: */
26: public class XMLCharacterRecognizer {
27:
28: /**
29: * Returns whether the specified <var>ch</var> conforms to the XML 1.0 definition
30: * of whitespace. Refer to <A href="http://www.w3.org/TR/1998/REC-xml-19980210#NT-S">
31: * the definition of <CODE>S</CODE></A> for details.
32: * @param ch Character to check as XML whitespace.
33: * @return =true if <var>ch</var> is XML whitespace; otherwise =false.
34: */
35: public static boolean isWhiteSpace(char ch) {
36: return (ch == 0x20) || (ch == 0x09) || (ch == 0xD)
37: || (ch == 0xA);
38: }
39:
40: /**
41: * Tell if the string is whitespace.
42: *
43: * @param ch Character array to check as XML whitespace.
44: * @param start Start index of characters in the array
45: * @param length Number of characters in the array
46: * @return True if the characters in the array are
47: * XML whitespace; otherwise, false.
48: */
49: public static boolean isWhiteSpace(char ch[], int start, int length) {
50:
51: int end = start + length;
52:
53: for (int s = start; s < end; s++) {
54: if (!isWhiteSpace(ch[s]))
55: return false;
56: }
57:
58: return true;
59: }
60:
61: /**
62: * Tell if the string is whitespace.
63: *
64: * @param buf StringBuffer to check as XML whitespace.
65: * @return True if characters in buffer are XML whitespace, false otherwise
66: */
67: public static boolean isWhiteSpace(StringBuffer buf) {
68:
69: int n = buf.length();
70:
71: for (int i = 0; i < n; i++) {
72: if (!isWhiteSpace(buf.charAt(i)))
73: return false;
74: }
75:
76: return true;
77: }
78:
79: /**
80: * Tell if the string is whitespace.
81: *
82: * @param s String to check as XML whitespace.
83: * @return True if characters in buffer are XML whitespace, false otherwise
84: */
85: public static boolean isWhiteSpace(String s) {
86:
87: if (null != s) {
88: int n = s.length();
89:
90: for (int i = 0; i < n; i++) {
91: if (!isWhiteSpace(s.charAt(i)))
92: return false;
93: }
94: }
95:
96: return true;
97: }
98:
99: }
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