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comparison servlet/src/digilib/io/XMLMetaLoader.java @ 233:e40d8b2e3978

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Servlet version 1.19b1 -- with context metadata - reads and caches context tags from index meta file - for use in dlContext-xml.jsp
author robcast
date Sat, 17 Jul 2004 19:25:26 +0200
parents f921735dc578
children aaf6eace011d
comparison
equal deleted inserted replaced
232:69b616b50431 233:e40d8b2e3978
39 private String outerTag = "resource"; 39 private String outerTag = "resource";
40 private String metaTag = "meta"; 40 private String metaTag = "meta";
41 private String fileTag = "file"; 41 private String fileTag = "file";
42 private String fileNameTag = "name"; 42 private String fileNameTag = "name";
43 private String filePathTag = "path"; 43 private String filePathTag = "path";
44 private String infoTag = "img"; 44 private String imgTag = "img";
45 private String collectTag = "context";
45 46
46 public XMLMetaLoader() { 47 public XMLMetaLoader() {
47 } 48 }
48 49
49 /** 50 /**
53 54
54 private LinkedList tags; 55 private LinkedList tags;
55 private HashMap files; 56 private HashMap files;
56 private HashMap meta; 57 private HashMap meta;
57 private StringBuffer content; 58 private StringBuffer content;
59 private boolean collecting;
60 private StringBuffer collectedContent;
58 private String fileName; 61 private String fileName;
59 private String filePath; 62 private String filePath;
60 63
61 /** 64 /**
62 * extracts the elements name from either localName ln or qName qn. 65 * extracts the elements name from either localName ln or qName qn.
73 } 76 }
74 // else it's qName (or nothing) 77 // else it's qName (or nothing)
75 return qn; 78 return qn;
76 } 79 }
77 80
81 /**
82 * returns all attributes as a String
83 *
84 * @param attrs
85 * @return
86 */
87 private String getAttrString(Attributes attrs) {
88 StringBuffer s = new StringBuffer();
89 for (int i = 0; i < attrs.getLength(); i++) {
90 String key = getName(attrs.getLocalName(i), attrs.getQName(i));
91 s.append(" "+key+"=\""+attrs.getValue(i));
92 }
93 return s.toString();
94 }
95
96
78 // Parser calls this once at the beginning of a document 97 // Parser calls this once at the beginning of a document
79 public void startDocument() throws SAXException { 98 public void startDocument() throws SAXException {
80 tags = new LinkedList(); 99 tags = new LinkedList();
81 files = new HashMap(); 100 files = new HashMap();
101 collecting = false;
102 collectedContent = null;
82 } 103 }
83 104
84 // Parser calls this for each element in a document 105 // Parser calls this for each element in a document
85 public void startElement( 106 public void startElement(
86 String namespaceURI, 107 String namespaceURI,
96 content = new StringBuffer(); 117 content = new StringBuffer();
97 118
98 if (name.equals(metaTag)) { 119 if (name.equals(metaTag)) {
99 // new meta tag 120 // new meta tag
100 meta = new HashMap(); 121 meta = new HashMap();
122 collectedContent = new StringBuffer();
101 } else if (name.equals(fileTag)) { 123 } else if (name.equals(fileTag)) {
102 // new file tag 124 // new file tag
103 fileName = null; 125 fileName = null;
104 filePath = null; 126 filePath = null;
105 meta = new HashMap(); 127 meta = new HashMap();
128 collectedContent = new StringBuffer();
129 } else if (name.equals(collectTag)) {
130 // start collecting
131 collecting = true;
132 if (collectedContent == null) {
133 collectedContent = new StringBuffer();
134 }
135 }
136
137 // record mode
138 if (collecting) {
139 collectedContent.append("<"+name);
140 collectedContent.append(getAttrString(atts));
141 collectedContent.append(">");
106 } 142 }
107 } 143 }
108 144
109 // parser calls this for all tag content (possibly more than once) 145 // parser calls this for all tag content (possibly more than once)
110 public void characters(char[] ch, int start, int length) 146 public void characters(char[] ch, int start, int length)
111 throws SAXException { 147 throws SAXException {
112 // append data to current string buffer 148 // append data to current string buffer
149 if (content == null) {
150 content = new StringBuffer();
151 }
113 content.append(ch, start, length); 152 content.append(ch, start, length);
114 } 153 }
115 154
116 // parser calls this at the end of each element 155 // parser calls this at the end of each element
117 public void endElement( 156 public void endElement(
121 throws SAXException { 160 throws SAXException {
122 161
123 String name = getName(localName, qName); 162 String name = getName(localName, qName);
124 // exit the tag 163 // exit the tag
125 tags.removeLast(); 164 tags.removeLast();
165 String lastTag = (tags.isEmpty()) ? "" : (String) tags.getLast();
126 166
127 // was it a file/name tag? 167 // was it a file/name tag?
128 if (name.equals(fileNameTag) && tags.contains(fileTag)) { 168 if (name.equals(fileNameTag) && lastTag.equals(fileTag)) {
129 // save name as filename 169 // save name as filename
130 if ((content != null) && (content.length() > 0)) { 170 if ((content != null) && (content.length() > 0)) {
131 fileName = content.toString().trim(); 171 fileName = content.toString().trim();
132 } 172 }
173 content = null;
133 return; 174 return;
134 } 175 }
135 176
136 // was it a file/path tag? 177 // was it a file/path tag?
137 if (name.equals(filePathTag) && tags.contains(fileTag)) { 178 if (name.equals(filePathTag) && lastTag.equals(fileTag)) {
138 // save path as filepath 179 // save path as filepath
139 if ((content != null) && (content.length() > 0)) { 180 if ((content != null) && (content.length() > 0)) {
140 filePath = content.toString().trim(); 181 filePath = content.toString().trim();
141 } 182 }
183 content = null;
142 return; 184 return;
143 } 185 }
144 186
145 // was it a file tag? 187 // was it a file tag?
146 if (name.equals(fileTag)) { 188 if (name.equals(fileTag)) {
155 } else { 197 } else {
156 fn = fileName; 198 fn = fileName;
157 } 199 }
158 } else { 200 } else {
159 // no file name, no file 201 // no file name, no file
202 content = null;
160 return; 203 return;
161 } 204 }
162 // save meta in file list 205 // save meta in file list
163 files.put(fn, meta); 206 files.put(fn, meta);
164 } 207 }
208 content = null;
165 return; 209 return;
166 } 210 }
167 211
168 // was it a meta tag outside a file tag? 212 // was it a meta tag outside a file tag?
169 if (name.equals(metaTag) && !tags.contains(fileTag)) { 213 if (name.equals(metaTag) && !tags.contains(fileTag)) {
170 // save meta as dir meta 214 // save meta as dir meta
171 if ((meta != null) && (meta.size() > 0)) { 215 if ((meta != null) && (meta.size() > 0)) {
172 files.put("", meta); 216 files.put("", meta);
173 } 217 }
174 return; 218 content = null;
175 } 219 return;
176 220 }
177 // is this inside an info (=img) tag? 221
178 if (tags.contains(infoTag)) { 222 // is this inside an digilib info (=img) tag?
223 if (lastTag.equals(imgTag)) {
179 // then add whatever this is 224 // then add whatever this is
180 if ((content != null) && (content.length() > 0)) { 225 if ((content != null) && (content.length() > 0)) {
181 meta.put(name, content.toString().trim()); 226 meta.put(name, content.toString().trim());
182 } 227 }
183 } 228 content = null;
184 229 return;
230 }
231
232 // is this the end of collectTag?
233 if (name.equals(collectTag)) {
234 collecting = false;
235 collectedContent.append("</"+collectTag+">\n");
236 // store collected stuff
237 meta.put(collectTag, collectedContent.toString());
238 //logger.debug("collected: '"+collectedContent+"'");
239 content = null;
240 return;
241 }
242
243 // write collected content
244 if (collecting) {
245 String s = "";
246 if ((content != null) && (content.length() > 0)) {
247 s = content.toString().trim();
248 }
249 //logger.debug("collect:"+name+" = "+s);
250 collectedContent.append(s);
251 collectedContent.append("</"+name+">\n");
252 content = null;
253 return;
254 }
185 } 255 }
186 256
187 } 257 }
188 258
189 /** 259 /**