org.ow2.proactive.process_tree_killer

Interface VariableResolver<V>

All Known Implementing Classes:

VariableResolver.ByMap, VariableResolver.Union

public interface VariableResolver<V>

Resolves variables to its value, while encapsulating how that resolution happens.

Author:

Kohsuke Kawaguchi

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	VariableResolver.ByMap<V> VariableResolver backed by a Map.
static class	VariableResolver.Union<V> Union of multiple VariableResolver.

Field Summary

Fields

Modifier and Type	Field and Description
static VariableResolver	NONE Empty resolver that always returns null.

Method Summary

Modifier and Type	Method and Description
V	resolve(String name) Receives a variable name and obtains the value associated with the name.

Field Detail

NONE

static final VariableResolver NONE

Empty resolver that always returns null.

Method Detail

resolve

V resolve(String name)

Receives a variable name and obtains the value associated with the name.

This can be implemented simply on top of a Map (see VariableResolver.ByMap), or this can be used like an expression evaluator.

Parameters:

name - Name of the variable to be resolved. Never null, never empty. The name shouldn't include the syntactic marker of an expression. IOW, it should be "foo" but not "${foo}". A part of the goal of this design is to abstract away the expression marker syntax.

Returns:

Object referenced by the name. Null if not found.