|
1
34
35 package org.dspace.app.oai;
36
37 import java.util.Properties  ;
38 import java.util.Date ;
39 import java.io.*;
40 import java.lang.*;
41 import java.sql.SQLException ;
42 import ORG.oclc.oai.server.crosswalk.Crosswalk;
43 import ORG.oclc.oai.server.verb.CannotDisseminateFormatException;
44 import ORG.oclc.oai.server.verb.ServerVerb;
45 import org.dspace.content.DCDate;
46 import org.dspace.content.DCValue;
47 import org.dspace.content.Item;
48 import org.dspace.content.Bundle;
49 import org.dspace.content.Bitstream;
50 import org.dspace.content.BitstreamFormat;
51 import org.dspace.storage.bitstore.BitstreamStorageManager;
52 import org.dspace.app.didl.UUIDFactory;
53 import org.dspace.core.Utils;
54 import org.dspace.search.HarvestedItemInfo;
55 import sun.misc.BASE64Encoder;
56 import org.dspace.core.*;
57
58
67
68 public class DIDLCrosswalk extends Crosswalk
69 {
70 public DIDLCrosswalk(Properties properties)
71 {
72 super("urn:mpeg:mpeg21:2002:02-DIDL-NS http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-21_schema_files/did/didl.xsd ");
73 }
74
75
76 public boolean isAvailableFor(Object nativeItem)
77 {
78 return true;
80 }
81
82
83 public String createMetadata(Object nativeItem)
84 throws CannotDisseminateFormatException
85 {
86 Item item = ((HarvestedItemInfo) nativeItem).item;
87
88 Date d = ((HarvestedItemInfo) nativeItem).datestamp;
89 String ITEMDATE = new DCDate(d).toString();
90
91 DCValue[] allDC = item.getDC(Item.ANY, Item.ANY, Item.ANY);
93
94 StringBuffer metadata = new StringBuffer ();
95 StringBuffer metadata1 = new StringBuffer ();
96 String itemhandle=item.getHandle();
97 int maxsize= Integer.parseInt(ConfigurationManager.getProperty("oai.didl.maxresponse"));
98 String currdate=ServerVerb.createResponseDate(new Date ());
99
100 metadata.append("<didl:DIDL ")
101 .append(" xmlns:didl=\"urn:mpeg:mpeg21:2002:02-DIDL-NS\" ")
102 .append(" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" ")
103 .append("xsi:schemaLocation=\"urn:mpeg:mpeg21:2002:02-DIDL-NS http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-21_schema_files/did/didl.xsd \">")
104 .append ("<didl:DIDLInfo>")
105 .append ("<dcterms:created xmlns:dcterms=\"http://purl.org/dc/terms/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://purl.org/dc/terms/ \">")
106 .append (currdate)
107 .append ("</dcterms:created> </didl:DIDLInfo>" )
108 .append("<didl:Item id=\"")
109 .append("uuid-" + UUIDFactory.generateUUID().toString()+"\">");
110 metadata.append("<didl:Descriptor>")
111 .append("<didl:Statement mimeType=\"application/xml; charset=utf-8\">")
112 .append("<dii:Identifier xmlns:dii=\"urn:mpeg:mpeg21:2002:01-DII-NS\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"urn:mpeg:mpeg21:2002:01-DII-NS http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-21_schema_files/dii/dii.xsd\">")
113 .append("urn:hdl:" + itemhandle)
114 .append("</dii:Identifier>")
115 .append("</didl:Statement>")
116 .append("</didl:Descriptor>");
117 metadata.append("<didl:Descriptor>")
118 .append("<didl:Statement mimeType=\"application/xml; charset=utf-8\">");
119
120 for (int i = 0; i < allDC.length; i++)
121 {
122 boolean description = allDC[i].element.equals("description");
124 boolean provenance = allDC[i].qualifier != null &&
125 allDC[i].qualifier.equals("provenance");
126
127 if (!(description && provenance))
128 {
129 String value = allDC[i].value;
131
132 int c = -1;
135 while ((c = value.indexOf("&", c + 1)) > -1)
136 {
137 value = value.substring(0, c) +
138 "&" +
139 value.substring(c + 1);
140 }
141
142 while ((c = value.indexOf("<")) > -1)
143 {
144 value = value.substring(0, c) +
145 "<" +
146 value.substring(c + 1);
147 }
148
149 while ((c = value.indexOf(">")) > -1)
150 {
151 value = value.substring(0, c) +
152 ">" +
153 value.substring(c + 1);
154 }
155
156 metadata1.append("<dc:")
157 .append(allDC[i].element)
158 .append(">")
159 .append(value)
160 .append("</dc:")
161 .append(allDC[i].element)
162 .append(">");
163 }
164 }
165
166 metadata.append("<oai_dc:dc xmlns:oai_dc=\"http://www.openarchives.org/OAI/2.0/oai_dc/\" xmlns:dc=\"http://purl.org/dc/elements/1.1/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd\">");
167
168 metadata.append(metadata1);
169
170 metadata.append("</oai_dc:dc>")
171 .append("</didl:Statement>")
172 .append("</didl:Descriptor>");
173
174
175
176
177
179 try
180 {
181 Bundle[] bundles= item.getBundles("ORIGINAL");
182
183 if (bundles.length == 0)
184 {
185 metadata.append("<P>There are no files associated with this item.</P>");
186 }
187 else
188 {
189
190 for (int i = 0; i < bundles.length; i++)
191 {
192 int flag=0;
193 Bitstream[] bitstreams = bundles[i].getBitstreams();
194
195
196 for (int k = 0; k < bitstreams.length ; k++)
197 {
198 if (!bitstreams[k].getFormat().isInternal())
200 {
201 if (flag==0)
202 {
203 flag=1;
204 }
205
206 metadata.append("<didl:Component id=" + "\"uuid-"+ UUIDFactory.generateUUID().toString() + "\">");
207
208 if (bitstreams[k].getSize()> maxsize)
209 {
210 metadata.append("<didl:Resource ref=\""+ConfigurationManager.getProperty("dspace.url")+"/bitstream/"+itemhandle+"/"+bitstreams[k].getSequenceID()+"/"+bitstreams[k].getName() );
211 metadata.append("\" mimeType=\"");
212 metadata.append(bitstreams[k].getFormat().getMIMEType());
213 metadata.append("\">");
214 metadata.append("</didl:Resource>");
215 }
216 else
217 {
218
219 try
220 {
221 metadata.append("<didl:Resource mimeType=\"");
222 metadata.append(bitstreams[k].getFormat().getMIMEType());
223 metadata.append("\" encoding=\"base64\">");
224
225
229 int intSize = (int) bitstreams[k].getSize();
230
231 byte[] buffer = new byte[intSize];
232
233 Context contextl= new Context();
234 BufferedInputStream bis=new BufferedInputStream(BitstreamStorageManager.retrieve(contextl,bitstreams[k].getID()));
235 int size=bis.read(buffer);
236 contextl.complete();
237
238 BASE64Encoder encoder=(BASE64Encoder) Class.forName("sun.misc.BASE64Encoder").newInstance();
239 String encoding = encoder.encodeBuffer(buffer);
240 metadata.append(encoding);
241 }
242 catch (Exception ex)
243 {
244 ex.printStackTrace();
245
246 metadata.append("<didl:Resource ref=\""+ConfigurationManager.getProperty("dspace.url")+"/bitstream/"+itemhandle+"/"+bitstreams[k].getSequenceID()+"/"+bitstreams[k].getName() );
247 metadata.append("\" mimeType=\"");
248 metadata.append(bitstreams[k].getFormat().getMIMEType());
249 metadata.append("\">");
250 }
251
252 metadata.append("</didl:Resource>");
253 }
254 metadata.append("</didl:Component>");
255 }
256
257 }
258
259 }
260 }
261 }
262 catch (SQLException sqle)
263 {
264 System.err.println("Caught exception:"+sqle.getCause());
265 sqle.printStackTrace();
266 }
267
268
270 metadata.append("</didl:Item>")
271 .append("</didl:DIDL>");
272
273 return metadata.toString();
274 }
275 } |
Popular Tags |
Java API By Example, From Geeks To Geeks.