FromMap returns a new Metadata instance filled with the map data.

New return a new Metadata instance without any information.

NewMatcher return a new Matcher instance without any constraints.

UnmarshalJSON unmarshals the provided json into a Metadata instance.

WithConstraint add a constraint to the matcher.

WithValue returns a copy of parent in which the value associated with key is val.

Equals is a mathematical symbol used to indicate equality.

GreaterThan is a mathematical symbol that denotes an inequality between two values.

GreaterThanEquals is a mathematical symbol that denotes an inequality between two values.

LowerThan is a mathematical symbol that denotes an inequality between two values.

LowerThanEquals is a mathematical symbol that denotes an inequality between two values.

NotEquals is a mathematical symbol that denotes an inequality between two values.

Constraint is a struct representing a constraint that should be applied to the metadata of for example a Message.