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1 package org.mmbase.util.magicfile;
2
3 import java.io.*;
4 import java.util.*;
5
6 import org.mmbase.util.*;
7 import org.mmbase.util.logging.*;
8 import org.mmbase.util.xml.DocumentReader;
9 import org.w3c.dom.Element  ;
10 import org.xml.sax.InputSource ;
11 import edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArrayList;
12
13
16 public class MagicXMLReader extends DocumentReader implements DetectorProvider {
17
18 private static Logger log = Logging.getLoggerInstance(MagicXMLReader.class);
19
20 private static MagicXMLReader reader = null;
21 protected static final String MAGICXMLFILE = "magic.xml";
22
24 private static void setReader(String config) throws IllegalArgumentException {
25 try {
26 InputSource is = ResourceLoader.getConfigurationRoot().getInputSource(config);
27 if (is != null) {
28 reader = new MagicXMLReader(is);
29 }
30 } catch (IOException ie) {
31 log.warn(ie);
32 }
33 }
34
35
39
40 public synchronized static MagicXMLReader getInstance() {
41 if (reader == null) {
43 setReader(MAGICXMLFILE);
44
45 if (reader != null) {
46 log.info("Magic XML file is: " + reader.getSystemId());
47 }
48
49 ResourceWatcher watcher = new ResourceWatcher() {
50 public void onChange(String file) {
51 setReader(file);
53 }
54 };
55 watcher.start();
56 watcher.add(MAGICXMLFILE);
57
58 }
59 return reader;
60 }
61 private List detectors = null;
62
63 private MagicXMLReader(InputSource is) {
64 super(is, MagicXMLReader.class);
65 }
66
67 public String getVersion() {
68 Element e = getElementByPath("magic.info.version");
69 return getElementValue(e);
70 }
71 public String getAuthor() {
72 Element e = getElementByPath("magic.info.author");
73 return getElementValue(e);
74 }
75 public String getDescription() {
76 Element e = getElementByPath("magic.info.description");
77 return getElementValue(e);
78 }
79
80
83 public List getDetectors() {
84 if (detectors == null) {
85 detectors = new CopyOnWriteArrayList();
86 Element e = getElementByPath("magic.detectorlist");
87 if (e == null) {
88 log.fatal("Could not find magic/detectorlist in magic.xml");
89 return detectors;
91 }
92 for (Iterator iter = getChildElements(e); iter.hasNext();) {
93 Element element = (Element ) iter.next();
94 Detector d = getOneDetector(element);
95 detectors.add(d);
96 }
97 }
98 return detectors;
99 }
100
101
104 private String convertOctals(String s) {
105 int p = 0;
106 int stoppedAt = 0;
107 ByteArrayOutputStream buf = new ByteArrayOutputStream();
108 char c;
109 try {
110 while (p < s.length()) {
111 c = s.charAt(p);
112 if (c == '\\') {
113 if (p > s.length() - 4) {
114 break;
116 } else {
117 char c0;
118 boolean failed = false;
119 for (int p0 = p + 1; p0 < p + 4; p0++) {
120 c0 = s.charAt(p0);
121 if (!((int)c0 >= '0' && (int) c0 <= '7')) {
122 failed = true;
123 }
124 }
125 if (!failed) {
126 byte[] bytes = s.substring(stoppedAt, p).getBytes("US-ASCII");
127 buf.write(bytes, 0, bytes.length);
128 buf.write(Integer.parseInt(s.substring(p + 1, p + 4), 8));
129 stoppedAt = p + 4;
130 p = p + 4;
131 } else {
132 p++;
133 }
134 }
135 } else {
136 p++;
137 }
138 }
139 byte[] bytes = s.substring(stoppedAt, p).getBytes("US-ASCII");
140 buf.write(bytes, 0, bytes.length);
141 return buf.toString("US-ASCII");
142 } catch (java.io.UnsupportedEncodingException use) { return "";
144 }
145 }
146
147 private Detector getOneDetector(Element e) {
148 Detector d = new Detector();
149 Element e1;
150
151 e1 = getElementByPath(e, "detector.mimetype");
152 d.setMimeType(getElementValue(e1));
153
154 e1 = getElementByPath(e, "detector.extension");
155 d.setExtension(getElementValue(e1));
156
157 e1 = getElementByPath(e, "detector.designation");
158 d.setDesignation(getElementValue(e1));
159
160 e1 = getElementByPath(e, "detector.test");
161 if (e1 != null) {
162 d.setTest(convertOctals(getElementValue(e1)));
163 d.setOffset(getElementAttributeValue(e1, "offset"));
164 d.setType(getElementAttributeValue(e1, "type"));
165 String comparator = getElementAttributeValue(e1, "comparator");
166 if (comparator.equals(">")) {
167 d.setComparator('>');
168 } else if (comparator.equals("<")) {
169 d.setComparator('<');
170 } else if (comparator.equals("&")) {
171 d.setComparator('&');
172 } else if (comparator.length() == 1) {
173 d.setComparator(comparator.charAt(0));
174 } else {
175 d.setComparator('=');
176 }
177 }
178
179 e1 = getElementByPath(e, "detector.childlist");
180 if (e1 != null) {
181 for (Iterator iter = getChildElements(e1); iter.hasNext();) {
182 Element element = (Element ) iter.next();
183 Detector child = getOneDetector(element);
184 d.addChild(child, 1); }
186 }
187 return d;
188 }
189 }
190 |
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