Utility class for wrapping another VariableMapper with a new context, represented by a {@link java.util.Map Map}. Modifications occur to the Map instance, but resolve against the wrapped VariableMapper if the Map doesn't contain the ValueExpression requested.
@author Jacob Hookom
@version $Id: VariableMapperWrapper.java 7265 2009-05-01 19:46:08Z rlubke $
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