Field

Description

This element allows to define the key and direction of the Expression defined above.

Field element is used by DataProviders.

GreenVulcano^® ESB Configuration

The Field Element is used by:

• ArrayDataProvider
• Axis2MessageContextDataProvider
• Axis2SAAJSOAPMessageDataProvider
• CollectionDataProvider
• GVBufferChangeDataProvider
• HttpMethodDataProvider
• InputStreamDataProvider
• JMSBytesMessageDataProvider
• JMSMapMessageDataProvider
• JMSObjectMessageDataProvider
• JMSStreamMessageDataProvider
• JMSTextMessageDataProvider
• MapDataProvider
• ObjectDataProvider
• StringDataProvider
• XMLEventCollectionDataProvider.

The following table shows the Field element's attributes:

Attribute	Type	Description
key	required	The attribute's value cannot be null.
type	fixed	This attribute must assume the value field.
direction	optional	Field direction. INOUT: The expression is evaluated on the object set (usually the current GVBuffer, unless otherwise specified by the attribute 'source-selector') the value returned by the expression, is added to the context with the prefix 'key_' + @key, and set the data provider to be returned in the output. IN : The expression is evaluated on the object set (usually the current GVBuffer, unless otherwise specified by the attribute 'source-selector') the value returned by the expression is added to the context with the prefix 'key_' + @key. OUT : The expression is evaluated directly on the object that is returned by the Data provider.

In all cases, two variables are added to the context:

• input: object set, usually the current GVBuffer, which will not be overwritten from attribute 'source-selector';
• output: the object that is returned by the Data provider.

Contains a sub-element Expression.

Expression

The following table shows the Expression element's attributes:

Attribute	Type	Description
type	required	The attribute's admitted values are: ognl xpath regex js