/**
* listIdentifiers() auxiliar method.
*
* @param resumptionToken
* @return
*/
@SuppressWarnings("unchecked")
private List<HeaderType> listIdentifiers(
String resumptionToken, String from, String until, String set, String metadataPrefix)
throws Exception {
// TODO: handle status attribute
identifiersResumptionToken = null;
String url;
if (resumptionToken == null) {
url = baseUrl + "?verb=ListIdentifiers&metadataPrefix=" + metadataPrefix;
if (from != null) {
url += "&from=" + from;
}
if (until != null) {
url += "&until=" + until;
}
if (set != null) {
url += "&set=" + set;
}
} else {
url = baseUrl + "?verb=ListIdentifiers&resumptionToken=" + resumptionToken;
}
OAIPMH oaipmh = oaipmhRequest(url);
handleOaiErrors(oaipmh);
ListIdentifiersType listIdentifiers = oaipmh.getListIdentifiers();
// Resumption token
if (listIdentifiers.getResumptionToken() != null
&& !"".equals(listIdentifiers.getResumptionToken().getValue())) {
identifiersResumptionToken = listIdentifiers.getResumptionToken().getValue();
}
return listIdentifiers.getHeaders();
}
private void handleOaiErrors(OAIPMH oaipmh) throws Exception {
// Errors
if (!oaipmh.getErrors().isEmpty()) {
OAIPMHerrorType error = oaipmh.getErrors().get(0);
throw new Exception("OAI harvester exception: " + error.getCode() + " - " + error.getValue());
}
}
/**
* Returns an IdentifyType object containing information about the OAI respository.
*
* @return A IdentifyType object.
* @throws Exception
*/
@SuppressWarnings("unchecked")
public IdentifyType identify() throws Exception {
String url = baseUrl + "?verb=Identify";
OAIPMH oaipmh = oaipmhRequest(url);
handleOaiErrors(oaipmh);
return oaipmh.getIdentify();
}
/**
* Returns a Record object harvested by his identifier using 'oai_dc' as metadataPrefix
*
* @param identifier A OAI document identifier.
* @return Record
*/
@SuppressWarnings("unchecked")
public RecordType getRecord(String identifier, String metadataPrefix) throws Exception {
String url =
baseUrl + "?verb=GetRecord&identifier=" + identifier + "&metadataPrefix=" + metadataPrefix;
OAIPMH oaipmh = oaipmhRequest(url);
handleOaiErrors(oaipmh);
return oaipmh.getGetRecord().getRecord();
}
/**
* Returns a List of MetadataFormatType from a given identifier.
*
* @param identifier valid OAI document identifier.
* @return {@link java.util.List}
* @throws Exception
*/
@SuppressWarnings("unchecked")
public List<MetadataFormatType> listMetadataFormats(String identifier) throws Exception {
String url = baseUrl + "?verb=ListMetadataFormats";
if (identifier != null) {
url += "&identifier=" + identifier;
}
OAIPMH oaipmh = oaipmhRequest(url);
handleOaiErrors(oaipmh);
return oaipmh.getListMetadataFormats().getMetadataFormats();
}
/**
* Returns a List of SetType supported by the repository.
*
* @return {@link java.util.List}
* @throws Exception
*/
@SuppressWarnings("unchecked")
private List<SetType> listSets(String resumptionToken) throws Exception {
String url = baseUrl + "?verb=ListSets";
if (resumptionToken != null) {
url += "&resumptionToken=" + resumptionToken;
}
OAIPMH oaipmh = oaipmhRequest(url);
handleOaiErrors(oaipmh);
if (oaipmh.getListSets().getResumptionToken() != null
&& !"".equals(oaipmh.getListSets().getResumptionToken().getValue())) {
setResumptionToken = oaipmh.getListSets().getResumptionToken().getValue();
} else {
setResumptionToken = null;
}
return oaipmh.getListSets().getSets();
}
