ReadingData

The following example uses userName.^myCustomMetadata to return the value of custom metadata that is defined as a variable (named userName) in the header of the script as a DataWeave script.

The following example uses the Set Payload component (set-payload) to produce a binary value, then uses the Transform Message component (ee:transform) component to return raw data for the MD5 (MD5(payload.^raw)) of the binary value.

In the following Mule app flow, the Loggers use payload.^mimeType to select a string "my string", then to select a string that is set within an fx expression (#["my string as String type" as String]) in the Set Payload (set-payload) component.

Returns the MIME type of a value that includes parameters (for example, application/json;charset=UTF-16). The expression in the value of { "myMediaType" : payload.^mediaType } might return "myMediaType": "/; charset=UTF-8" for an input POJO.

In the following Mule app flow, the Logger uses payload.^encoding to select the encoding of "my string"`set in the Set Payload (`set-payload) component.

Returns the class of the Plain Old Java Object (POJO). The value might result from calling a method in a Java class or have a data type (such as String or DateTime) that DataWeave treats as a Java value.

In the following Mule app flow, the Logger uses payload.^contentLength to select the length of the string my string, set in the Set Payload (set-payload) component.

Returns the value of specified metadata for a Mule payload, variable, or attribute.

You can check for the presence of a given key. ! evaluates the selection and fails with an exception message if the key is not present. ? returns true if the selected key is present, false if not. Note that ? is also used in Filter Selectors (myKey[?($ == "aValue")]).

# returns the XML namespace of a selected key as plain text.