Create a constraint that partially matches the current topic value.
The topic must be a JSON topic (or a TIME_SERIES topic with a json event type). The PartialJSON partially describes the structure of a JSON value. The with or without methods must be used to fully qualify the constraint.
This constraint is useful when changing the value of a topic. The constraint is unsatisfied if no topic is present at the path, making it unsuitable for operations that try to add topics.
the constraint
Create a constraint requiring a lock to be held by the session.
This can be used to coordinate operations between multiple sessions.
the lock
the constraint
Create a constraint requiring the path to have no topic.
This is useful when setting the first value of a topic being added using an UpdateStream without changing the value if the topic already exists. This constraint is unsatisfied if a topic is present at the path, making it unsuitable for operations that try to set topics without adding them.
the constraint
Create a constraint requiring the topic to have no value.
This is useful when setting the first value of a topic. This constraint is unsatisfied if no topic is present at the path, making it unsuitable for operations that try to add topics.
the constraint
Create a constraint requiring the current value of the topic to exactly match the supplied value.
This is exactly equivalent to calling value(UpdateConstraint.Operator, Object) specifying the IS operator.
the value
the optional type of the values
the constraint
Create a constraint comparing the current value of a topic to a supplied value.
If a String value is supplied and the operator is EQ or NE, the string representation of the topic will be compared to the supplied value. This can only be used with primitive topic types (or TIME_SERIES topics with a primitive event type). Other operators (other than IS) are not permitted with String values.
If a number value is supplied (Int64 or Double) the value will be compared with the number value of the topic. This will work with STRING, INT64 or DOUBLE topics (or TIME_SERIES topics with a primitive event type) only. STRING topics can only be compared if they contain a value that can be parsed as a number. If the value of a STRING topic cannot be parsed as a number, or the topic is of any other non-number type the constraint will be unsatisfied. Any of the operators (other than IS) can be used with such number comparisons. Decimal numbers can be compared with integral numbers so {@code 1} is equal to {@code 1.0}, {@code "1"}, or {@code "1.0"}.
If the IS operator is specified the specified value will be compared to the topic value for strict binary equality. The value type can be any value type supported by DataTypes or any Bytes value and can be used to compare against any topic type.
When a STRING, INT64 or DOUBLE topic is updated to a {@code null} value, the topic is set to have no value. Use the noValue() constraint to check if the topic has no value.
This constraint is useful when changing the value of a topic. This constraint is unsatisfied if no topic is present at the path, making it unsuitable for operations that try to add topics.
the operator that determines the type of comparison
the value
the constraint
Factory for the constraint types.
An instance can be obtained by calling diffusion.updateConstraints().
6.2