/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.app.oai;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Date;
import java.util.Properties;
import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Logger;
import org.dspace.app.didl.UUIDFactory;
import org.dspace.content.Bitstream;
import org.dspace.content.Bundle;
import org.dspace.content.Item;
import org.dspace.core.ConfigurationManager;
import org.dspace.core.Context;
import org.dspace.search.HarvestedItemInfo;
import org.dspace.storage.bitstore.BitstreamStorageManager;
import ORG.oclc.oai.server.crosswalk.Crosswalk;
import ORG.oclc.oai.server.verb.CannotDisseminateFormatException;
import ORG.oclc.oai.server.verb.ServerVerb;
/**
* DSpace Item DIDL crosswalk.
*
* Development of this code was part of the aDORe repository project
* by the Research Library of the Los Alamos National Laboratory.
*
* @author Henry Jerez
* @author Los Alamos National Laboratory
*/
public class DIDLCrosswalk extends Crosswalk
{
private static final Logger log = Logger.getLogger(DIDLCrosswalk.class);
/** default value if no oai.didl.maxresponse property is defined */
public static final int MAXRESPONSE_INLINE_BITSTREAM = 0;
/** another crosswalk that will be used to generate the metadata section */
private Crosswalk metadataCrosswalk;
public DIDLCrosswalk(Properties properties)
{
super("urn:mpeg:mpeg21:2002:02-DIDL-NS http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-21_schema_files/did/didl.xsd ");
// FIXME this should be injected from the configuration...
// but it is better than duplicate the OAIDCCrosswalk code!
metadataCrosswalk = new OAIDCCrosswalk(properties);
}
public boolean isAvailableFor(Object nativeItem)
{
// We have DC for everything
return true;
}
public String createMetadata(Object nativeItem)
throws CannotDisseminateFormatException
{
Item item = ((HarvestedItemInfo) nativeItem).item;
StringBuffer metadata = new StringBuffer();
String itemhandle=item.getHandle();
String strMaxSize = ConfigurationManager.getProperty("oai", "didl.maxresponse");
int maxsize = MAXRESPONSE_INLINE_BITSTREAM;
if (strMaxSize != null)
{
maxsize = Integer.parseInt(strMaxSize);
}
String currdate=ServerVerb.createResponseDate(new Date());
metadata.append("<didl:DIDL ")
.append(" xmlns:didl=\"urn:mpeg:mpeg21:2002:02-DIDL-NS\" ")
.append(" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" ")
.append("xsi:schemaLocation=\"urn:mpeg:mpeg21:2002:02-DIDL-NS http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-21_schema_files/did/didl.xsd \">")
.append ("<didl:DIDLInfo>")
.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/ \">")
.append (currdate)
.append ("</dcterms:created> </didl:DIDLInfo>" )
.append("<didl:Item id=\"")
.append("uuid-" + UUIDFactory.generateUUID().toString()+"\">");
metadata.append("<didl:Descriptor>")
.append("<didl:Statement mimeType=\"application/xml; charset=utf-8\">")
.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\">").append("urn:hdl:").append(itemhandle)
.append("</dii:Identifier>")
.append("</didl:Statement>")
.append("</didl:Descriptor>");
metadata.append("<didl:Descriptor>")
.append("<didl:Statement mimeType=\"application/xml; charset=utf-8\">");
// delegate the metadata section to another crosswalk
metadata.append(metadataCrosswalk.createMetadata(nativeItem));
metadata
.append("</didl:Statement>")
.append("</didl:Descriptor>");
/**putfirst item here**/
//**CYCLE HERE!!!!**//
try
{
Bundle[] bundles= item.getBundles("ORIGINAL");
if (bundles.length != 0)
{
/**cycle bundles**/
for (int i = 0; i < bundles.length; i++)
{
int flag=0;
Bitstream[] bitstreams = bundles[i].getBitstreams();
/**cycle bitstreams**/
for (int k = 0; k < bitstreams.length ; k++)
{
// Skip internal types
if (!bitstreams[k].getFormat().isInternal())
{
if (flag==0)
{
flag=1;
}
metadata.append("<didl:Component id=" + "\"uuid-"+ UUIDFactory.generateUUID().toString() + "\">");
if (bitstreams[k].getSize()> maxsize)
{
metadata.append("<didl:Resource ref=\""+ConfigurationManager.getProperty("dspace.url")+"/bitstream/"+itemhandle+"/"+bitstreams[k].getSequenceID()+"/"+bitstreams[k].getName() );
metadata.append("\" mimeType=\"");
metadata.append(bitstreams[k].getFormat().getMIMEType());
metadata.append("\">");
metadata.append("</didl:Resource>");
}
else
{
try
{
metadata.append("<didl:Resource mimeType=\"");
metadata.append(bitstreams[k].getFormat().getMIMEType());
metadata.append("\" encoding=\"base64\">");
/*
* Assume that size of in-line bitstreams will always be
* smaller than MAXINT bytes
*/
int intSize = (int) bitstreams[k].getSize();
byte[] buffer = new byte[intSize];
Context contextl= new Context();
InputStream is = BitstreamStorageManager.retrieve(contextl,bitstreams[k].getID());
BufferedInputStream bis = new BufferedInputStream(is);
try
{
bis.read(buffer);
}
finally
{
if (bis != null)
{
try
{
bis.close();
}
catch (IOException ioe)
{
}
}
if (is != null)
{
try
{
is.close();
}
catch (IOException ioe)
{
}
}
}
contextl.complete();
String encoding = new String(Base64.encodeBase64(buffer), "ASCII");
metadata.append(encoding);
}
catch (Exception ex)
{
log.error("Error creating resource didl", ex);
metadata.append("<didl:Resource ref=\"")
.append(ConfigurationManager.getProperty("dspace.url"))
.append("/bitstream/")
.append(itemhandle).append("/").append(bitstreams[k].getSequenceID())
.append("/").append(bitstreams[k].getName());
metadata.append("\" mimeType=\"");
metadata.append(bitstreams[k].getFormat().getMIMEType());
metadata.append("\">");
}
metadata.append("</didl:Resource>");
}
metadata.append("</didl:Component>");
}
/*end bitstream cycle*/
}
/*end bundle cycle*/
}
}
}
catch (SQLException sqle)
{
System.err.println("Caught exception:"+sqle.getCause());
log.error("Database error", sqle);
}
//**END CYCLE HERE **//
metadata.append("</didl:Item>")
.append("</didl:DIDL>");
return metadata.toString();
}
}