org.hawkular.btm.api.internal.actions

Class DataExpressionHandler

java.lang.Object

org.hawkular.btm.api.internal.actions.ExpressionHandler

org.hawkular.btm.api.internal.actions.DataExpressionHandler

Direct Known Subclasses:

JSONExpressionHandler, TextExpressionHandler, XMLExpressionHandler

public abstract class DataExpressionHandler
extends ExpressionHandler

This class provides the JSON expression handler implementation.

Author:

gbrown

Constructor Summary

Constructors

Constructor and Description
DataExpressionHandler(Expression expression)

Method Summary

Modifier and Type	Method and Description
protected Object	getDataValue(BusinessTransaction btxn, Node node, Direction direction, Map<String,?> headers, Object[] values) This method returns the data value associated with the requested data source and key..
void	init(Processor processor, ProcessorAction action, boolean predicate) This method initialises the expression handler.
boolean	isUsesContent() This method indicates whether the expression uses content.
boolean	isUsesHeaders() This method indicates whether the expression uses headers.

Methods inherited from class org.hawkular.btm.api.internal.actions.ExpressionHandler

evaluate, getExpression, getIssues, setExpression, setIssues, test

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DataExpressionHandler

public DataExpressionHandler(Expression expression)

Parameters:

expression -

Method Detail

isUsesHeaders

public boolean isUsesHeaders()

This method indicates whether the expression uses headers.

Overrides:

isUsesHeaders in class ExpressionHandler

Returns:

Whether headers are used

isUsesContent

public boolean isUsesContent()

This method indicates whether the expression uses content.

Overrides:

isUsesContent in class ExpressionHandler

Returns:

Whether content is used

init

public void init(Processor processor,
                 ProcessorAction action,
                 boolean predicate)

This method initialises the expression handler.

Specified by:

init in class ExpressionHandler

Parameters:

processor - The processor

action - The action

predicate - Whether the expression is a predicate

getDataValue

protected Object getDataValue(BusinessTransaction btxn,
                              Node node,
                              Direction direction,
                              Map<String,?> headers,
                              Object[] values)

This method returns the data value associated with the requested data source and key..

Parameters:

btxn - The business transaction

node - The node

direction - The direction

headers - The optional headers

values - The values

Returns:

The required data value