Allow stateful namespaces (ns:function)
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Key: JEXL-94
URL: https://issues.apache.org/jira/browse/JEXL-94
Project: Commons JEXL
Issue Type: Improvement
Reporter: Henri Biestro
Assignee: Henri Biestro
Fix For: 2.0
The current basic behavior of namespaces only allows stateless execution.
In some cases, this is not convenient enough (SCXML for instance); by having
namespaces instantiated at script/expression evaluation time and passing the
JexlContext as their constructor argument, the namespace can define members
that functions (namespace methods) can use. It makes namespaces almost as
potent as regular JexlContext variables, full blown objects.
Convention will be that a namespace whose value is a class having a constructor
that uses a JexlContext as argument is such a 'stateful' namespace.
They are instantiated on need and their lifetime spans the evaluation call.
Experience suggests that the JexlContext should probably be derived to contain
the information necessary to instantiate the namespace without polluting the
variable space.
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