hudson.util
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

static class	VariableResolver.ByMap<V> VariableResolver backed by a Map.
static class	VariableResolver.Union<V> Union of multiple VariableResolver.

Field Summary

static VariableResolver

NONE Empty resolver that always returns null.

Method Summary

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 VariableResolver.ByMap (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.