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uk.org.ogsadai.activity.xmldb
Class XPathStatementActivity

java.lang.Object
  |
  +--uk.org.ogsadai.activity.Activity
        |
        +--uk.org.ogsadai.activity.xmldb.XMLDBActivity
              |
              +--uk.org.ogsadai.activity.xmldb.XPathStatementActivity
public class XPathStatementActivity
extends XMLDBActivity

An XMLDBActivity for performing XPath statements.

For information on this activity see the OGSA-DAI user doc: OGSA-DAI/doc/interaction/activities/xml/xPathStatement.html

Author:
The OGSA-DAI Project Team

Field Summary
private static?java.lang.String COPYRIGHT_NOTICE
??????????Copyright statement
private static?DAILogger LOG
??????????Logger object for logging in this class
private ?BlockMaker mBlocks
??????????Used to generate the result blocks.
private ?java.util.Map mNamespaceMappings
??????????The namespace mappings.
private ?java.lang.String mQuery
??????????The XPath query string.
private ?java.lang.String mResourceID
??????????The resource ID to query or null to query the whole collection.
?
Fields inherited from class uk.org.ogsadai.activity.xmldb.XMLDBActivity
mDataResource, mOutput, mSubCollectionName, mUserCredentials
?
Fields inherited from class uk.org.ogsadai.activity.Activity
mContext, mExternalInputs, mExternalOutputs, mInternalInputs, mInternalOutputs
?
Constructor Summary
XPathStatementActivity(org.w3c.dom.Element?element)
??????????Constructs an XPath activity using the specified XML element.
?
Method Summary
?void processBlock()
??????????Performs an iteration of the processing of an activity.
protected ?void processFirst()
??????????This method is called during the first iteration of processing an activity.
?
Methods inherited from class uk.org.ogsadai.activity.xmldb.XMLDBActivity
initialise
?
Methods inherited from class uk.org.ogsadai.activity.Activity
cleanUp, connectsTo, createOutputPipe, getActivityConfiguration, getActivityName, getCause, getName, getObservableStatus, getProperties, getSession, getStatus, hasActivityConfiguration, hasProperties, process, setActivityName, setCompleted, setError
?
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
?

Field Detail

COPYRIGHT_NOTICE

private static final java.lang.String COPYRIGHT_NOTICE
Copyright statement

See Also:
Constant Field Values

LOG

private static DAILogger LOG
Logger object for logging in this class

mBlocks

private BlockMaker mBlocks
Used to generate the result blocks.

mQuery

private java.lang.String mQuery
The XPath query string.

mNamespaceMappings

private java.util.Map mNamespaceMappings
The namespace mappings.

mResourceID

private java.lang.String mResourceID
The resource ID to query or null to query the whole collection.

Constructor Detail

XPathStatementActivity

public XPathStatementActivity(org.w3c.dom.Element?element)
                       throws ActivitySpecificationException,
                              ActivityCreationException
Constructs an XPath activity using the specified XML element.

Parameters:
element - Element to configure the activity with - from a perform document.
Throws:
ActivityCreationException - If there is a problem constructing the activity due to an implementation error or OGSA-DAI confguration problem.
ActivitySpecificationException - If there is a problem constructing the activity due to an invalid setting in element. mistake such as an invalid setting.
Method Detail

processBlock

public void processBlock()
Description copied from class: Activity
Performs an iteration of the processing of an activity. This may involve reading a block of input data and writing a block of output data, or may involve some other kind of processing. When an activity is processed by the OGSA-DAI engine, this method will be invoked repeatedly until the activity either completes or stops due to an error or termination call. An implementation of this method should invoke the setCompleted method to indicate that processing is complete, or the setError method if an error occurs that will prevent the processing from completing.

Specified by:
processBlock in class XMLDBActivity

processFirst

protected final void processFirst()
Description copied from class: Activity
This method is called during the first iteration of processing an activity. It can be overridden by subclasses to define some processing that should be done only once during the first iteration of the activity processing, for example evaluating a database query.

Overrides:
processFirst in class Activity
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