org.mule.sdk.api.annotation.binding

Annotation Type Binding

public @interface Binding

Marks a binding between a parameter in a ValueProvider or a SampleDataProvider to an extraction expression. This way, the provider can take care of the acquisition of the acting parameter, and it can be reused among other components which hold the acting parameter on different parameters, or fields.

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
String	actingParameter
String	extractionExpression Gets the expression used to get the acting part of the component whose value is taken for the provider acting parameter.

Element Detail

actingParameter

public abstract String actingParameter

Returns:

The name of the field in the ValueProvider or SampleDataProvider that is annotated with the Parameter annotation.

extractionExpression

public abstract String extractionExpression

Gets the expression used to get the acting part of the component whose value is taken for the provider acting parameter. This expression is a DataWeave expression that only uses selectors to retrieve the value for the acting parameter. The available context for the expression has the value of all the component's parameters. The expression must start with the name of a parameter of the component, then if the value comes from a part of the parameter, the expression follows with the selector to the desired field. For example: This is an example of a possible value for a parameter named body so that the type of the parameter is understood.

        {
          "routingInfo": {
            "channelId": "CHANNEL_ID_VALUE",
            "region": "SOUTH"
          }
            "message": "The message to send"
        }
 

The extractionExpression for using the "channelId" field as acting parameter is "body.routingInfo.channelId". No aggregations between parameters are allowed. The extraction expression result will be taken as application/java. No other media type is supported for the output. If the value for this attribute is the name of a component parameter, it means that the value of the acting parameter, is that of the whole parameter.

Returns:

the expression used to extract the value of the acting parameter.