org.apache.commons.betwixt.expression

This package contains the system which extracts values from beans. The mapping is created by class introspection but the Expression implementations in this package inspect a particular bean instance and extract the values used to render the bean as xml.

ConstantExpression represents a constant expression.

In other words, ConstantExpression.evaluate returns a value independent of the context.

Context describes the context used to evaluate bean expressions. This is mostly a bean together with a number of context variables. Context variables are named objects. In other words, a context variable associates an object with a string.

Logging during expression evaluation is done through the logging instance held by this class.

EmptyExpression returns the same value as is passed in.

MapEntryAdder is used to add entries to a map.

MapEntryAdder supplies two updaters:

• MapEntryAdder.getKeyUpdater() which allows the entry key to be updated
• MapEntryAdder.getValueUpdater() which allows the entry value to be updated