Package prefuse.data.expression

Classes implementing an SQL-like expression language for filtering and manipulating data.

See:
Description

Interface Summary

Expression	An Expression is an arbitrary function that takes a single Tuple as an argument.
ExpressionVisitor	Visitor interface for objects that visit each sub-expression of an Expression instance, performing some computation or data collection.
Function	Expression sub-interface representing a function in the prefuse expression language.
Predicate	A Predicate is a special type of Expression that carries the guarantee that the Expression.getBoolean(Tuple) method is supported.

Class Summary

AbstractExpression	Abstract base class for Expression implementations.
AbstractPredicate	Abstract base class for dedicated Predicate instances.
AndPredicate	Predicate representing an "and" clause of sub-predicates.
ArithmeticExpression	Expression supporting basic arithmetic: add, subtract, multiply, divide, exponentiate (pow), and modulo (%).
BinaryExpression	Abstract base class for Expression implementations that maintain two sub-expressions.
BooleanLiteral	Literal expression of a boolean value.
ColumnExpression	Expression instance that returns the value stored in a Tuple data field.
ComparisonPredicate	Predicate implementation that computes a comparison operation.
CompositePredicate	Abstract base class for Predicate instances that maintain one or more sub-predicates (clauses).
ExpressionAnalyzer	Library class that computes some simple analyses of an expression.
FunctionExpression	Abstract base class for FunctionExpression implementations.
FunctionTable	Function table that allows lookup of registered FunctionExpressions by their function name.
IfExpression	Expression instance representing an "if then else" clause in the prefuse expression language.
Literal	Abstarct base class for a Literal Expression that evaluates to a constant value.
NotPredicate	Predicate representing the negation of another predicate.
NumericLiteral	Literal expression of a numeric value.
ObjectLiteral	Literal expression of an Object value.
OrPredicate	Predicate representing an "or" clause of sub-predicates.
RangePredicate	Predicate instance that evaluates if a value is contained within a bounded range.
XorPredicate	Predicate representing an "xor" clause of sub-predicates.

Package prefuse.data.expression Description

Classes implementing an SQL-like expression language for filtering and manipulating data. The base type of the language, Expression, represents a calculation over a single tuple at a time. Expressions can be created programatically by instantiating the desired classes of this package, or can be compiled from a textual language with a SQL-like syntax by the ExpressionParser class.