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## fr.gouv.culture.oai
Class AbstractOAIHarvester

    java.lang.Object
      fr.gouv.culture.util.apache.avalon.excalibur.concurrent.Semaphore
          fr.gouv.culture.util.apache.avalon.excalibur.concurrent.Mutex
              fr.gouv.culture.util.apache.cocoon.xml.AbstractSynchronizedXMLProducer
                  fr.gouv.culture.util.apache.cocoon.xml.AbstractSynchronizedXMLPipe
                      fr.gouv.culture.oai.SynchronizedOAIObjectImpl
                          fr.gouv.culture.oai.AbstractOAIHarvester

All Implemented Interfaces:
  org.apache.avalon.framework.configuration.Configurable, org.xml.sax.ContentHandler, org.apache.avalon.framework.context.Contextualizable, org.xml.sax.ext.LexicalHandler, org.apache.avalon.framework.logger.LogEnabled, OAIHarvester, OAIObject, org.apache.avalon.excalibur.pool.Poolable, org.apache.avalon.excalibur.pool.Recyclable, org.apache.avalon.framework.service.Serviceable, org.apache.avalon.excalibur.concurrent.Sync, SynchronizedXMLConsumer, SynchronizedXMLPipe, SynchronizedXMLProducer, org.apache.excalibur.xml.sax.XMLConsumer, org.apache.cocoon.xml.XMLConsumer, org.apache.excalibur.xml.sax.XMLizable, org.apache.cocoon.xml.XMLPipe, org.apache.cocoon.xml.XMLProducer

Direct Known Subclasses:
  AbstractDocumentBaseOAIHarvester

public abstract class AbstractOAIHarvester
extends SynchronizedOAIObjectImpl
implements OAIHarvester, org.apache.avalon.framework.service.Serviceable

Created by IntelliJ IDEA. User: rpandey Date: Apr 24, 2003 Time: 4:57:04 PM To change this template use Options | File Templates.

Nested Class Summary

Nested classes inherited from class fr.gouv.culture.oai.OAIObject
`OAIObject.Node`

Field Summary
`protected java.lang.String[]` | `adminEmails` List of email address strings for administrators of this harvester
`protected boolean` | `captureElemContent` flag for sax event handling indicating that an element's content should be captured in the endElement method
`protected boolean` | `captureRecord` flag for sax event handling indicating that a record should be capture
`protected java.lang.String` | `currentDatestamp` The _datestamp for the current record from the stream
`protected java.lang.String` | `currentMetadtaUrlIdentifier` Variable to hold any value retrieved based on
`protected java.lang.String` | `currentOaiIdentifier` The oai identifier for the current record from the stream
`protected java.lang.String` | `currentOaiStatus` The oai status for the current record from the stream
`protected int` | `cursor` Variable to hold cursor information from a request using resumptionTokens to return an entire set by multiple parts
`protected boolean` | `deleteRecord` flag for sax event handling indicating that a record should be delete
`protected org.apache.cocoon.xml.XMLConsumer` | `firstXmlConsumer` The first externally provided xml consumer.
`protected java.lang.String` | `identifierName` if a identifier name is provided we will attempt to take the value of the element named as such outside of the OAI2.0 namespace and retrieve an underlying XML document assuming the value is a valid url identifier and will incorporate the XML content into the oai-record
`protected org.apache.avalon.framework.service.ServiceManager` | `manager` Service manager for the object
`protected java.lang.String` | `newRequestUrl` The new URL to resolve the next resumptionToken
`static java.lang.String` | `OAI_REPOSITORY_URL`
`static java.lang.String` | `OAI_REQUEST_URL`
`protected java.lang.String` | `repoUrl` Variable to hold the url of the repository from which a response is being received
`protected org.apache.avalon.framework.parameters.Parameters` | `requestParams` The parameters for the request sent for which a response is being received
`protected java.lang.String` | `requestUrl` Variable to hold the url of the request to be sent
`protected java.lang.String` | `responseDate` Variable to hold the _datestamp of the response of the repository from which a response is being received
`protected java.lang.String` | `resumptionToken` Variable to hold the resumptionToken of the response of the repository from which a response is being received
`protected java.lang.StringBuffer` | `sBuff` buffer for data collection from sax stream
`protected java.lang.String` | `userAgent` User agent value to send with request

Fields inherited from class fr.gouv.culture.oai.SynchronizedOAIObjectImpl
`_context, logger`

Fields inherited from class fr.gouv.culture.util.apache.cocoon.xml.AbstractSynchronizedXMLPipe
`synchronizedXmlConsumerAcquired`

Fields inherited from class fr.gouv.culture.util.apache.cocoon.xml.AbstractSynchronizedXMLProducer
`synchronizedXmlConsumer`

Fields inherited from interface fr.gouv.culture.oai.OAIObject
`HTTP_HEADER_NAME_FROM, HTTP_HEADER_NAME_USER_AGENT, NUMBER_RECORDS_PER_RESPONSE, STRING_DATEFORMAT_GRANULARITY_DAY, STRING_DATEFORMAT_GRANULARITY_SECOND`

Constructor Summary
`AbstractOAIHarvester()`

Method Summary
`protected void` | `abortRecordCapture()` Stops any record capture currently being executed and sends a flag to the called method telling it to delete any document saved to any media
`protected abstract void` | `captureRecord()` When a complete record is received, this method takes the necessary steps to save the record to any underlying media, or pre-media
`protected abstract void` | `captureResourceFromUrlIdentifier()` When a complete "underlying document" is received, this method takes the necessary steps to save the document to any underlying media, or pre-media
`void` | `characters(char[] chars, int relation, int relation1)` Receive notification of character data.
`void` | `endElement(java.lang.String s, java.lang.String s1, java.lang.String s2)` Receive notification of the end of an element.
`java.lang.String[]` | `getAdminEmails()` Retrieves the list of adminstrator email addresses
`protected org.apache.avalon.framework.parameters.Parameters` | `getHarvestParameters()` This method returns the parameters for the request sent by this harvester as well as the "repository url", "request url", and the "harvester admin email".
`protected void` | `handleErrors(java.lang.String errorMsg)` Logs error messages, and the request parameters for that were sent to the repository which may have caused the error state
`protected abstract void` | `handleResumptionToken()` This method handles and reissues a new request using any resumption token received
`protected abstract void` | `prepareRecordCapture()` Prepares resources for capturing an oai record
`protected abstract void` | `prepareRecordForDeletion()` After receiving a header@status="deleted" for a record, this method makes the necessary preparations to delete the record from the harvester
`protected abstract void` | `prepareResourceFromUrlIdentifierCapture()` Prepares resources for capturing the underlying document available via a url described by the oai record
`void` | `receiveRequest(java.lang.String url)` Internal receive request method that by passes synchronization of this object as it may have already been synchronized elsewhere in the processing.
`void` | `receiveSynchronizedRequest(java.lang.String url)` Receive an OAI request
`void` | `receiveSynchronizedRequest(java.lang.String url, java.lang.String originalRequestUrl)` Receive an OAI request as an URL.
`void` | `recycle()` Clears any consumers provided to this object
`protected void` | `resetAllFields()` Resets the necessary class fields
`protected abstract void` | `resetRecordCaptureFields(boolean deleteDoc)` Stops any record capture currently being executed, resets the corresponding class fields and potentially deletes any document saved to any media
`protected void` | `resetResumptionToken()`
`protected abstract void` | `saveCriticalFields(boolean dataHarvested)` If data has been harvested, this method saves the any/all details of the harvest
`void` | `service(org.apache.avalon.framework.service.ServiceManager serviceManager)` The service manager for the object
`void` | `setAdminEmails(java.lang.String[] adminEmails)` Establishes the list of adminstrator email addresses
`void` | `setConsumer(org.apache.cocoon.xml.XMLConsumer consumer)` Set's the consumer of this object's events and will attempt to establish our `firstXmlConsumer`
`void` | `setIdentifierName(java.lang.String name)` Establishes the identifier class field
`protected abstract boolean` | `shouldHarvestDocument()` Querys underlying data structures do determine whether the current oai record should be harvested based on the state of the harvester (ie. past harvests, presence or lack or record in harvester data structures)
`void` | `startElement(java.lang.String s, java.lang.String s1, java.lang.String s2, org.xml.sax.Attributes attributes)` Receive notification of the beginning of an element.
`protected abstract void` | `storeFailedHarvestData(java.lang.Exception e)` This method stores information about a failed (internal failure not external error from OAI repository) harvest request, so that the valid request may be reexecuted by the proper mechanism.
`protected abstract boolean` | `storeHarvestedData()` This method saves all harvested records to a particular media
`void` | `toSAX(org.xml.sax.ContentHandler contentHandler)` Currently does nothing TODO:

Methods inherited from class fr.gouv.culture.oai.SynchronizedOAIObjectImpl
`contextualize, enableLogging, getContext, sendElement, sendElementContent`

Methods inherited from class fr.gouv.culture.util.apache.cocoon.xml.AbstractSynchronizedXMLPipe
`acquireSynchronizedXMLConsumer, comment, endCDATA, endDocument, endDTD, endEntity, endPrefixMapping, ignorableWhitespace, processingInstruction, releaseSynchronizedXMLConsumer, setDocumentLocator, skippedEntity, startCDATA, startDocument, startDTD, startEntity, startPrefixMapping`

Methods inherited from class fr.gouv.culture.util.apache.cocoon.xml.AbstractSynchronizedXMLProducer
`setConsumer, setSynchronizedConsumer`

Methods inherited from class fr.gouv.culture.util.apache.avalon.excalibur.concurrent.Mutex
`isAcquired`

Methods inherited from class fr.gouv.culture.util.apache.avalon.excalibur.concurrent.Semaphore
`acquire, attempt, getTokens, release`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface fr.gouv.culture.oai.OAIHarvester
`purgePastHarvestsData, sendPastHarvestsSummary, sendStoredHarvestingRequests`

Methods inherited from interface org.apache.avalon.framework.logger.LogEnabled
`enableLogging`

Methods inherited from interface org.apache.avalon.framework.context.Contextualizable
`contextualize`

Methods inherited from interface org.xml.sax.ContentHandler
`endDocument, endPrefixMapping, ignorableWhitespace, processingInstruction, setDocumentLocator, skippedEntity, startDocument, startPrefixMapping`

Methods inherited from interface org.xml.sax.ext.LexicalHandler
`comment, endCDATA, endDTD, endEntity, startCDATA, startDTD, startEntity`

Methods inherited from interface org.apache.avalon.framework.configuration.Configurable
`configure`

Methods inherited from interface fr.gouv.culture.util.apache.cocoon.xml.SynchronizedXMLProducer
`setConsumer`

Methods inherited from interface org.apache.avalon.excalibur.concurrent.Sync
`acquire, attempt, release`

Field Detail

### OAI_REQUEST_URL

    public static final java.lang.String OAI_REQUEST_URL

See Also:
  Constant Field Values

### OAI_REPOSITORY_URL

    public static final java.lang.String OAI_REPOSITORY_URL

See Also:
  Constant Field Values

### manager

    protected org.apache.avalon.framework.service.ServiceManager manager

  Service manager for the object

### adminEmails

    protected java.lang.String[] adminEmails

  List of email address strings for administrators of this harvester

### userAgent

    protected java.lang.String userAgent

  User agent value to send with request

### requestUrl

    protected java.lang.String requestUrl

  Variable to hold the url of the request to be sent

### newRequestUrl

    protected java.lang.String newRequestUrl

  The new URL to resolve the next resumptionToken

### requestParams

    protected org.apache.avalon.framework.parameters.Parameters requestParams

  The parameters for the request sent for which a response is being received

### sBuff

    protected java.lang.StringBuffer sBuff

  buffer for data collection from sax stream

### captureElemContent

    protected boolean captureElemContent

  flag for sax event handling indicating that an element's content should be captured in the endElement method

### captureRecord

    protected boolean captureRecord

  flag for sax event handling indicating that a record should be capture

### deleteRecord

    protected boolean deleteRecord

  flag for sax event handling indicating that a record should be delete

### repoUrl

    protected java.lang.String repoUrl

  Variable to hold the url of the repository from which a response is being received

### responseDate

    protected java.lang.String responseDate

  Variable to hold the _datestamp of the response of the repository from which a response is being received

### resumptionToken

    protected java.lang.String resumptionToken

  Variable to hold the resumptionToken of the response of the repository from which a response is being received

### cursor

    protected int cursor

  Variable to hold cursor information from a request using resumptionTokens to return an entire set by multiple parts

### currentOaiIdentifier

    protected java.lang.String currentOaiIdentifier

  The oai identifier for the current record from the stream

### currentDatestamp

    protected java.lang.String currentDatestamp

  The _datestamp for the current record from the stream

### currentOaiStatus

    protected java.lang.String currentOaiStatus

  The oai status for the current record from the stream

### identifierName

    protected java.lang.String identifierName

  if a identifier name is provided we will attempt to take the value of the element named as such outside of the OAI2.0 namespace and retrieve an underlying XML document assuming the value is a valid url identifier and will incorporate the XML content into the oai-record

### currentMetadtaUrlIdentifier

    protected java.lang.String currentMetadtaUrlIdentifier

  Variable to hold any value retrieved based on

  See Also:
    `identifierName`

### firstXmlConsumer

    protected org.apache.cocoon.xml.XMLConsumer firstXmlConsumer

  The first externally provided xml consumer. As serialization of the sax stream must be done the consumer of this object has to be dynamically changed and therefore we need a reference to the first externall provided consumer so that we may continue to supply it with sax events.

Constructor Detail

### AbstractOAIHarvester

    public AbstractOAIHarvester()

Method Detail

### service

    public void service(org.apache.avalon.framework.service.ServiceManager serviceManager)
                 throws org.apache.avalon.framework.service.ServiceException

  The service manager for the object

  Specified by:
    `service` in interface `org.apache.avalon.framework.service.Serviceable`
  Parameters:
    `serviceManager` -
  Throws:
    `org.apache.avalon.framework.service.ServiceException`

### setConsumer

    public void setConsumer(org.apache.cocoon.xml.XMLConsumer consumer)

  Set's the consumer of this object's events and will attempt to establish our `firstXmlConsumer`

  Specified by:
    `setConsumer` in interface `org.apache.cocoon.xml.XMLProducer`
  Overrides:
    `setConsumer` in class `AbstractSynchronizedXMLProducer`
  Parameters:
    `consumer` -

### getAdminEmails

    public java.lang.String[] getAdminEmails()

  Retrieves the list of adminstrator email addresses

  Specified by:
    `getAdminEmails` in interface `OAIHarvester`
  Returns:

### setAdminEmails

    public void setAdminEmails(java.lang.String[] adminEmails)

  Establishes the list of adminstrator email addresses

  Specified by:
    `setAdminEmails` in interface `OAIHarvester`

### setIdentifierName

    public void setIdentifierName(java.lang.String name)

  Establishes the identifier class field

  Specified by:
    `setIdentifierName` in interface `OAIHarvester`
  Parameters:
    `name` -
  See Also:
    `identifierName`

### toSAX

    public void toSAX(org.xml.sax.ContentHandler contentHandler)
               throws org.xml.sax.SAXException

  Currently does nothing TODO:

  Specified by:
    `toSAX` in interface `org.apache.excalibur.xml.sax.XMLizable`
  Parameters:
    `contentHandler` -
  Throws:
    `org.xml.sax.SAXException`

### startElement

    public void startElement(java.lang.String s,
                             java.lang.String s1,
                             java.lang.String s2,
                             org.xml.sax.Attributes attributes)
                      throws org.xml.sax.SAXException

  Description copied from class: `AbstractSynchronizedXMLPipe`
  Receive notification of the beginning of an element.

  Specified by:
    `startElement` in interface `org.xml.sax.ContentHandler`
  Overrides:
    `startElement` in class `SynchronizedOAIObjectImpl`
  Throws:
    `org.xml.sax.SAXException`

### characters

    public void characters(char[] chars,
                           int relation,
                           int relation1)
                    throws org.xml.sax.SAXException

  Description copied from class: `AbstractSynchronizedXMLPipe`
  Receive notification of character data.

  Specified by:
    `characters` in interface `org.xml.sax.ContentHandler`
  Overrides:
    `characters` in class `AbstractSynchronizedXMLPipe`
  Parameters:
    `chars` - The characters from the XML document.
    `relation` - The start position in the array.
    `relation1` - The number of characters to read from the array.
  Throws:
    `org.xml.sax.SAXException`

### endElement

    public void endElement(java.lang.String s,
                           java.lang.String s1,
                           java.lang.String s2)
                    throws org.xml.sax.SAXException

  Description copied from class: `AbstractSynchronizedXMLPipe`
  Receive notification of the end of an element.

  Specified by:
    `endElement` in interface `org.xml.sax.ContentHandler`
  Overrides:
    `endElement` in class `AbstractSynchronizedXMLPipe`
  Parameters:
    `s` - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.
    `s1` - The local name (without prefix), or the empty string if Namespace processing is not being performed.
    `s2` - The raw XML 1.0 name (with prefix), or the empty string if raw names are not available.
  Throws:
    `org.xml.sax.SAXException`

### abortRecordCapture

    protected void abortRecordCapture()

  Stops any record capture currently being executed and sends a flag to the called method telling it to delete any document saved to any media

### handleErrors

    protected void handleErrors(java.lang.String errorMsg)

  Logs error messages, and the request parameters for that were sent to the repository which may have caused the error state

  Parameters:
    `errorMsg` -

### prepareRecordCapture

    protected abstract void prepareRecordCapture()
                                          throws org.xml.sax.SAXException

  Prepares resources for capturing an oai record

  Throws:
    `org.xml.sax.SAXException`

### shouldHarvestDocument

    protected abstract boolean shouldHarvestDocument()

  Querys underlying data structures do determine whether the current oai record should be harvested based on the state of the harvester (ie. past harvests, presence or lack or record in harvester data structures)

  Returns:

### captureRecord

    protected abstract void captureRecord()
                                   throws java.lang.Exception

  When a complete record is received, this method takes the necessary steps to save the record to any underlying media, or pre-media

  Throws:
    `java.lang.Exception`

### prepareRecordForDeletion

    protected abstract void prepareRecordForDeletion()

  After receiving a header@status="deleted" for a record, this method makes the necessary preparations to delete the record from the harvester

### prepareResourceFromUrlIdentifierCapture

    protected abstract void prepareResourceFromUrlIdentifierCapture()

  Prepares resources for capturing the underlying document available via a url described by the oai record

  See Also:
    `#currentMetadtaUrlIdentifier, #identifierName`

### captureResourceFromUrlIdentifier

    protected abstract void captureResourceFromUrlIdentifier()

  When a complete "underlying document" is received, this method takes the necessary steps to save the document to any underlying media, or pre-media

  See Also:
    `#currentMetadtaUrlIdentifier, #identifierName`

### storeHarvestedData

    protected abstract boolean storeHarvestedData()
                                           throws java.lang.Exception

  This method saves all harvested records to a particular media

  Throws:
    `java.lang.Exception`

### storeFailedHarvestData

    protected abstract void storeFailedHarvestData(java.lang.Exception e)

  This method stores information about a failed (internal failure not external error from OAI repository) harvest request, so that the valid request may be reexecuted by the proper mechanism.

### handleResumptionToken

    protected abstract void handleResumptionToken()

  This method handles and reissues a new request using any resumption token received

### saveCriticalFields

    protected abstract void saveCriticalFields(boolean dataHarvested)
                                        throws org.xml.sax.SAXException

  If data has been harvested, this method saves the any/all details of the harvest

  Parameters:
    `dataHarvested` - boolean indicating data was harvested
  Throws:
    `org.xml.sax.SAXException`

### resetRecordCaptureFields

    protected abstract void resetRecordCaptureFields(boolean deleteDoc)

  Stops any record capture currently being executed, resets the corresponding class fields and potentially deletes any document saved to any media

  Parameters:
    `deleteDoc` -

### resetAllFields

    protected void resetAllFields()

  Resets the necessary class fields

### recycle

    public void recycle()

  Clears any consumers provided to this object

  Specified by:
    `recycle` in interface `org.apache.avalon.excalibur.pool.Recyclable`
  Overrides:
    `recycle` in class `AbstractSynchronizedXMLPipe`

### resetResumptionToken

    protected void resetResumptionToken()

### receiveSynchronizedRequest

    public void receiveSynchronizedRequest(java.lang.String url)

  Receive an OAI request

  Specified by:
    `receiveSynchronizedRequest` in interface `OAIHarvester`

### receiveSynchronizedRequest

    public void receiveSynchronizedRequest(java.lang.String url,
                                           java.lang.String originalRequestUrl)

  Receive an OAI request as an URL. The original request may have been changed if we are updating. In that case, we only want to get the last documents

  Specified by:
    `receiveSynchronizedRequest` in interface `OAIHarvester`
  Parameters:
    `url` - : the url wich represent the request
    `originalRequestUrl` - : the original request

### receiveRequest

    public void receiveRequest(java.lang.String url)

  Internal receive request method that by passes synchronization of this object as it may have already been synchronized elsewhere in the processing. It is useful when handling resumption tokens

  Specified by:
    `receiveRequest` in interface `OAIHarvester`
  Parameters:
    `url` -

### getHarvestParameters

    protected org.apache.avalon.framework.parameters.Parameters getHarvestParameters()

  This method returns the parameters for the request sent by this harvester as well as the "repository url", "request url", and the "harvester admin email". This info will be useful when harvested records are processed.

  Returns:

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Copyright © 2000-2003 Ministere de la culture et de la communication / AJLSM. All Rights Reserved.