Constraints

A Constraint controls the input value of a property. Constraints can be used to validate input values, and to ensure the use of certain predefined values for the properties. Constraints are defined separately from content types and aspects, and are referenced within a property type definition.

Constraint types

Alfresco provides four types of constraints out of the box, as follows. Apart from these four, the custom constraints can be defined by using Java Programming Language.

• REGEX: ensures that a property value matches a defined regular expression pattern

• LIST: ensures that a property value is picked up from a list of predefined values

• MINMAX: ensures that the given property value falls within a defined numeric range

• LENGTH: ensures that the given property value falls within a defined character length range

REGEX

The following REGEX expression ensures that the property "filename" does not match the defined regular expression pattern. This constraint thus ensures that the file...