def listIdentifiers(baseUrl, metadataPrefix, set=None, from_=None, until=None, cursor=0, batch_size=10):
"""Return a list of Headers with the given parameters from the specified OAI-PMH server."""
args = {'verb': "ListIdentifiers",
'metadataPrefix': metadataPrefix
}
if set is not None:
args['set'] = set
if from_ is not None:
args['from'] = str(from_)
if until is not None:
args['until'] = str(until)
params = urllib.urlencode(args)
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
headers = []
while data is not None:
try:
tree = etree.fromstring(data)
except:
sys.stderr.write(url + '\n')
sys.stderr.write(data + '\n')
sys.stderr.flush()
raise
for h in tree.xpath('//oai:header', namespaces={'oai': NS_OAIPMH}):
headers.append(headerFromLxmlElement(h))
resTok = tree.xpath('string(//oai:resumptionToken)', namespaces={'oai': NS_OAIPMH})
if resTok:
params = urllib.urlencode({'verb': "ListIdentifiers",
'resumptionToken': resTok})
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
else:
break
return headers
def listRecords(baseUrl,
metadataPrefix,
set=None,
from_=None,
until=None,
cursor=0,
batch_size=10):
"""Return a list of (Header, metadata, about) tuples for records which match the given parameters from the specified OAI-PMH server."""
args = {'verb': "ListRecords", 'metadataPrefix': metadataPrefix}
if set is not None:
args['set'] = set
if from_ is not None:
args['from'] = str(from_)
if until is not None:
args['until'] = str(until)
params = urllib.urlencode(args)
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
records = []
i = 0
while (data is not None):
try:
tree = etree.fromstring(data)
except:
print url
print data
raise
for recEl in tree.xpath('//oai:record', namespaces={'oai': NS_OAIPMH}):
if i < cursor:
i += 1
continue
hEl = recEl.xpath('//oai:header', namespaces={'oai': NS_OAIPMH})[0]
header = headerFromLxmlElement(hEl)
mdEl = recEl.xpath('//oai:metadata/*',
namespaces={'oai': NS_OAIPMH})[0]
recString = etree.tostring(mdEl)
rec = LxmlRecord(mdEl,
xml=recString,
docId=header.identifier(),
byteCount=len(recString))
records.append((header, rec, None))
i += 1
if (len(headers) >= batch_size):
return headers
resTok = tree.xpath('string(//oai:resumptionToken)',
namespaces={'oai': NS_OAIPMH})
if resTok:
data = fetch_data(url + '&resumptionToken=' + cgi_encode(resTok))
else:
break
return records
def getRecord(baseUrl, metadataPrefix, identifier):
"""Return (Header, metadata, about) tuple of record with specified identifier from the specified OAI-PMH server."""
args = {
'verb': "GetRecord",
'metadataPrefix': metadataPrefix,
'identifier': identifier
}
params = urllib.urlencode(args)
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
try:
tree = etree.fromstring(data)
except:
sys.stderr.write(url + '\n')
sys.stderr.write(data + '\n')
sys.stderr.flush()
raise
hEl = tree.xpath('//oai:record[1]/oai:header',
namespaces={'oai': NS_OAIPMH})[0]
header = headerFromLxmlElement(hEl)
recEl = tree.xpath('//oai:record[1]/oai:metadata/*',
namespaces={'oai': NS_OAIPMH})[0]
recString = etree.tostring(recEl)
rec = LxmlRecord(recEl,
xml=recString,
docId=identifier,
byteCount=len(recString))
return (header, rec, None)
def listRecords(baseUrl, metadataPrefix, set=None, from_=None, until=None, cursor=0, batch_size=10):
"""Return a list of (Header, metadata, about) tuples for records which match the given parameters from the specified OAI-PMH server."""
args = {'verb': "ListRecords",
'metadataPrefix': metadataPrefix
}
if set is not None:
args['set'] = set
if from_ is not None:
args['from'] = str(from_)
if until is not None:
args['until'] = str(until)
params = urllib.urlencode(args)
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
records = []
i = 0
while (data is not None):
try:
tree = etree.fromstring(data)
except:
print url
print data
raise
for recEl in tree.xpath('//oai:record', namespaces={'oai': NS_OAIPMH}):
if i < cursor:
i+=1
continue
hEl = recEl.xpath('//oai:header', namespaces={'oai': NS_OAIPMH})[0]
header = headerFromLxmlElement(hEl)
mdEl = recEl.xpath('//oai:metadata/*', namespaces={'oai': NS_OAIPMH})[0]
recString = etree.tostring(mdEl)
rec = LxmlRecord(mdEl, xml=recString, docId=header.identifier(), byteCount=len(recString))
records.append((header, rec, None))
i+=1
if (len(headers) >= batch_size):
return headers
resTok = tree.xpath('string(//oai:resumptionToken)', namespaces={'oai': NS_OAIPMH})
if resTok:
data = fetch_data(url + '&resumptionToken=' + cgi_encode(resTok))
else:
break
return records
def listIdentifiers(baseUrl,
metadataPrefix,
set=None,
from_=None,
until=None,
cursor=0,
batch_size=10):
"""Return a list of Headers with the given parameters from the specified OAI-PMH server."""
args = {'verb': "ListIdentifiers", 'metadataPrefix': metadataPrefix}
if set is not None:
args['set'] = set
if from_ is not None:
args['from'] = str(from_)
if until is not None:
args['until'] = str(until)
params = urllib.urlencode(args)
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
headers = []
while data is not None:
try:
tree = etree.fromstring(data)
except:
sys.stderr.write(url + '\n')
sys.stderr.write(data + '\n')
sys.stderr.flush()
raise
for h in tree.xpath('//oai:header', namespaces={'oai': NS_OAIPMH}):
headers.append(headerFromLxmlElement(h))
resTok = tree.xpath('string(//oai:resumptionToken)',
namespaces={'oai': NS_OAIPMH})
if resTok:
params = urllib.urlencode({
'verb': "ListIdentifiers",
'resumptionToken': resTok
})
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
else:
break
return headers
def getRecord(baseUrl, metadataPrefix, identifier):
"""Return (Header, metadata, about) tuple of record with specified identifier from the specified OAI-PMH server."""
args = {'verb': "GetRecord",
'metadataPrefix': metadataPrefix,
'identifier': identifier}
params = urllib.urlencode(args)
url = "{0}?{1}".format(baseUrl, params)
data = fetch_data(url)
try:
tree = etree.fromstring(data)
except:
sys.stderr.write(url + '\n')
sys.stderr.write(data + '\n')
sys.stderr.flush()
raise
hEl = tree.xpath('//oai:record[1]/oai:header', namespaces={'oai': NS_OAIPMH})[0]
header = headerFromLxmlElement(hEl)
recEl = tree.xpath('//oai:record[1]/oai:metadata/*', namespaces={'oai': NS_OAIPMH})[0]
recString = etree.tostring(recEl)
rec = LxmlRecord(recEl, xml=recString, docId=identifier, byteCount=len(recString))
return (header, rec, None)
