org.mule.module.json

Class JsonExpressionEvaluator

java.lang.Object

org.mule.module.json.JsonExpressionEvaluator

All Implemented Interfaces:

ExpressionEvaluator, NamedObject

Direct Known Subclasses:

JsonNodeExpressionEvaluator

public class JsonExpressionEvaluator
extends Object
implements ExpressionEvaluator

An expression evaluator to allow users to define json expressions in their mule configuration, i.e. #[json:person/addresses[0]/postcode]

See the JsonData object for mor information about the query syntax.

It is also possible to use this evaluator in ExpressionFilter objects. For example a filter could be defined as -

#[json:person/registered]

Where 'registered' is a boolean value. It is also possible to filter on the existence of a value i.e.

#[json:person/favouriteColour]

Which would return true if 'favouriteColour' has been set. This evaluator also dds two logic operators you can use to create more sophisticated boolean expressions; equals and not equals -

#[json:person/favouriteColour = red]

or

#[json:person/favouriteColour != brown]

See Also:

JsonData

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.commons.logging.Log	logger logger used by this class

Constructor Summary

Constructors

Constructor and Description
JsonExpressionEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
Object	evaluate(String expression, MuleMessage message)
protected Object	extractResultFromNode(org.codehaus.jackson.JsonNode result)
String	getName()

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final transient org.apache.commons.logging.Log logger

logger used by this class

Constructor Detail

JsonExpressionEvaluator

public JsonExpressionEvaluator()

Method Detail

evaluate

public Object evaluate(String expression,
              MuleMessage message)

Specified by:

evaluate in interface ExpressionEvaluator

extractResultFromNode

protected Object extractResultFromNode(org.codehaus.jackson.JsonNode result)

getName

public String getName()

Specified by:

getName in interface NamedObject