uk.org.ogsadai.activity.transform
Class StringTokenizerActivity
java.lang.Object
|
+--uk.org.ogsadai.activity.Activity
|
+--uk.org.ogsadai.activity.transform.StringTokenizerActivity
- public class StringTokenizerActivity
- extends Activity
This activity tokenizes the input data it recieves using a specified set of delimiters. The functionality is similar to that provided by the java.util.StringTokenizer class. This class has one input (the blocks of data to be tokenized) and one output (the tokens). This activity supports any type of input data, but blocks which are not instances of String or byte[] will be converted into strings using their toString methods. For information on this activity see the OGSA-DAI user doc: OGSA-DAI/doc/interaction/activities/transform/stringTokenizer.html
- Author:
- The OGSA-DAI Project Team
| Method Summary |
void |
initialise()
This method should be overridden by subclasses to perform any initialisation they require before the process method invocations begin. |
private void |
maintainTokenizer()
This method maintains the mTokenizer field by making sure that it is initialised with the next block of input data whenever it runs out of tokens. |
void |
processBlock()
Performs an iteration of the processing of an activity. |
| Methods inherited from class uk.org.ogsadai.activity.Activity |
cleanUp, connectsTo, createOutputPipe, getActivityConfiguration, getActivityName, getCause, getName, getObservableStatus, getProperties, getSession, getStatus, hasActivityConfiguration, hasProperties, process, processFirst, setActivityName, setCompleted, setError |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
COPYRIGHT_NOTICE
private static final java.lang.String COPYRIGHT_NOTICE
-
Copyright notice
- See Also:
- Constant Field Values
mInput
private BlockReader mInput
-
Input string data.
mOutput
private BlockWriter mOutput
-
Tokenized output data.
mDelimiters
private java.lang.String mDelimiters
-
String containing the delimiter(s) used for tokenizing.
mTokenizer
private java.util.StringTokenizer mTokenizer
-
Used for tokenizing the input data.
StringTokenizerActivity
public StringTokenizerActivity(org.w3c.dom.Element element)
throws ActivitySpecificationException,
ActivityCreationException
initialise
public void initialise()
throws ActivitySpecificationException,
ActivityExecutionException
- Description copied from class:
Activity
-
This method should be overridden by subclasses to perform any initialisation they require before the
process method invocations begin. This might be used for setting up convenient fields to reference objects contained in the context. It shouldn't be used for opening resources. That should be done in processFirst.
-
- Overrides:
initialise in class Activity
-
- Throws:
ActivityExecutionException - If some system problem prevents the activity from initialising.ActivitySpecificationException - If a problem with settings provided by a client prevents the activity from initialising.
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 Activity
-
maintainTokenizer
private final void maintainTokenizer()
-
This method maintains the mTokenizer field by making sure that it is initialised with the next block of input data whenever it runs out of tokens.
-