Activity - webrowsetProjection

Activity Type: Transformation

Description

Project a column of a WebRowSet document based on the given name or index.

Example

<webRowSetProjection name="projectValues">
 <webRowSetInput from="statementOutput"/>
    <attributeName>email</attributeName>
 <attributeValuesOutput name="projectOutput"/>
 </webRowSetProjection>

<webRowSetProjection name="projectValues">
 <webRowSetInput from="statementOutput"/>
    <attributeIndex>4</attributeIndex>
 <attributeValuesOutput name="projectOutput"/>
 </webRowSetProjection>

Specification

Element webRowSetProjection:

• Attribute name - unique name for the activity within the scope of a request.
• Element webRowSetInput (required) - define the WebRowSet document whose values will be projected.
• • Attribute from (optional) - name of the output from another activity which provides the value of this parameter.
• One of the following elements to indicate if the projection is based on column name or index.
• • Element attributeName  - the column name whose rows will be projected.
  • Element attributeIndex  - the column index whose rows will be projected.
• Element attributeValuesOutput (required) - output stream which produces the projected values.
  • Attribute name - name of this output stream.

Input and Output Types

• Input: webRowSetInput - java.lang.String in a WebRowSet format.
• Output: attributeValuesOuput - java.lang.String

Data Resource Accessor

This activity can operate with any data resource accessor.

XML Schema

OGSA-DAI/schema/ogsadai/xsd/activities/webrowset_projection.xsd

Class

uk.org.ogsadai.activity.transform.WebRowSetProjectionActivity

Client Toolkit Class

uk.org.ogsadai.client.toolkit.activity.transform.WebRowSetProjection