# Package org.apache.solr.analytics.expression

Expressions map either zero, one, two or many inputs to a single value.

See: Description

- Class Summary
  Class | Description
  --- | ---
  BaseExpression | `BaseExpression` returns the value returned by the `StatsCollector` for the specified stat.
  DualDelegateExpression | Abstraction of an expression that applies a function to two delegate expressions.
  Expression | Expressions map either zero, one, two or many inputs to a single value.
  ExpressionFactory |
  MultiDelegateExpression | Abstraction of an expression that applies a function to an array of delegate expressions.
  SingleDelegateExpression | Abstraction of an expression that applies a function to one delegate expression.

## Package org.apache.solr.analytics.expression Description

Expressions map either zero, one, two or many inputs to a single value. They can be defined recursively to compute complex math.

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