Package freemarker.template.expression

The mechanics of FM-Classic expressions are implemented in this package.

See:
Description

Interface Summary

Binary	An interface for binary operators.
Expression	An Expression can return a TemplateModel value.
Operator	Interface that represents an operator expression.
Unary	An interface for unary operators.
Variable	An interface for expressions that get their values from the data model, and for those data models that can be set to a value.

Class Summary

AbstractBinary	Abstract class that implements most of the surrounding machinery needed for binary expressions.
And	Performs a logical "and" operation on two template models.
BooleanLiteral	Represents a boolean literal in a FM-Classic template.
Constant	Represents a constant value within an expression.
Divide	A division operator.
Dot	The dot operator.
DynamicKeyName	A unary operator that uses the string value of an expression as a hash key.
EmptyLiteral	Represents an empty literal in a FM-Classic template.
Equals	Performs an equality test on two template models.
ExpressionBuilder	A TemplateParser can use this class's static ExpressionBuilder.buildExpression(java.util.List) method to build a complete Expression or sub-expression from a List of Expressions.
ExpressionCache	A simple expression cache.
ExpressionUtils	Utility methods for evaluating expressions.
GreaterThan	A greater-than operator.
GreaterThanOrEquals	A greater-than-or-equals operator.
HashLiteral	Represents a literal Hash model in a FM-Classic template.
Identifier	An identifer in a variable.
Lambda	Implements a Lambda expression.
LambdaMethod	Implements an instance of a lambda expression.
LessThan	A less-than operator.
LessThanOrEquals	A less-than-or-equals operator.
ListLiteral	Represents a literal List model in a FM-Classic template.
ListRange	An expression that represents a indexModel of list values.
MethodCall	A unary operator that calls a TemplateMethodModel.
Minus	A subtraction operator.
Modulo	A modulus operator.
Multiply	A multiplication operator.
Not	Performs a logical "not" operation on a given template model.
NotEquals	Performs an inequality test on two template models.
NumberLiteral	Represents a number literal in a FM-Classic template.
Or	Performs a logical "or" operation on two template models.
Plus	An addition operator.
StringLiteral	Represents a String literal in a FM-Classic template.
Ternary	An expression that represents a conditional ternary operator.

Enum Summary

ExpressionBuilder.Precedence	Order of operator precedence.
ExpressionUtils.ExpressionType	Enumerates the types of results that an expression can generate.
Unary.Association	Indicates the operator association for this unary expression.

Package freemarker.template.expression Description

The mechanics of FM-Classic expressions are implemented in this package. Expressions are represented as a syntax tree, of which each node implements the Expression interface. Expressions can then be divided up in two ways:

• Parser symbols versus runtime expression elements, or
• Unary versus binary operators

Runtime expression elements are a subset of the parser symbols. The special cases are the symbols generated for parenthesized operators. These are emitted by the parser in order for the ExpressionBuilder class to generate the expression tree with the correct hierarchy.

Other expression elements are either binary or unary operators, indicating how they should be associated with the operators around them. Operator precedence is handled by the ExpressionBuilder when expressions are constructed.