All Known Implementing Classes:

AbstractOperator, InfixAndOperator, InfixDivisionOperator, InfixEqualsOperator, InfixGreaterEqualsOperator, InfixGreaterOperator, InfixLessEqualsOperator, InfixLessOperator, InfixMinusOperator, InfixModuloOperator, InfixMultiplicationOperator, InfixNotEqualsOperator, InfixOrOperator, InfixPlusOperator, InfixPowerOfOperator, PrefixMinusOperator, PrefixNotOperator, PrefixPlusOperator
```
public interface OperatorIfc
```
Interface that is required for all operators in an operator dictionary for evaluation of expressions. There are three operator type: prefix, postfix and infix. Every operator has a precedence, which defines the order of operator evaluation. The associativity of an operator is a property that determines how operators of the same precedence are grouped in the absence of parentheses.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class OperatorIfc.OperatorType
The operator type.

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`OPERATOR_PRECEDENCE_ADDITIVE`	Additive operators precedence: + and -
`static int`	`OPERATOR_PRECEDENCE_AND`	And operator precedence: &&
`static int`	`OPERATOR_PRECEDENCE_COMPARISON`	Comparative operators precedence: <, >, <=, >=
`static int`	`OPERATOR_PRECEDENCE_EQUALITY`	Equality operators precedence: =, ==, !=, <>
`static int`	`OPERATOR_PRECEDENCE_MULTIPLICATIVE`	Multiplicative operators precedence: *, /, %
`static int`	`OPERATOR_PRECEDENCE_OR`	Or operator precedence: \|\|
`static int`	`OPERATOR_PRECEDENCE_POWER`	Power operator precedence: ^
`static int`	`OPERATOR_PRECEDENCE_POWER_HIGHER`	An optional higher power operator precedence, higher than the unary prefix, e.g.
`static int`	`OPERATOR_PRECEDENCE_UNARY`	Unary operators precedence: + and - as prefix

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`EvaluationValue`	`evaluate(Expression expression, Token operatorToken, EvaluationValue... operands)`	Performs the operator logic and returns an evaluation result.
`int`	`getPrecedence()`
`int`	`getPrecedence(ExpressionConfiguration configuration)`	Called during parsing, can be implemented to return a customized precedence.
`boolean`	`isInfix()`	If it is an infix operator.
`boolean`	`isLeftAssociative()`	If operators with same precedence are evaluated from left to right.
`boolean`	`isOperandLazy()`	Checks if the operand is lazy.
`boolean`	`isPostfix()`	If it is a postfix operator.
`boolean`	`isPrefix()`	If it is a prefix operator.

- Field Detail
  - OPERATOR_PRECEDENCE_OR
```
static final int OPERATOR_PRECEDENCE_OR
```
    Or operator precedence: ||
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_AND
```
static final int OPERATOR_PRECEDENCE_AND
```
    And operator precedence: &&
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_EQUALITY
```
static final int OPERATOR_PRECEDENCE_EQUALITY
```
    Equality operators precedence: =, ==, !=, <>
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_COMPARISON
```
static final int OPERATOR_PRECEDENCE_COMPARISON
```
    Comparative operators precedence: <, >, <=, >=
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_ADDITIVE
```
static final int OPERATOR_PRECEDENCE_ADDITIVE
```
    Additive operators precedence: + and -
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_MULTIPLICATIVE
```
static final int OPERATOR_PRECEDENCE_MULTIPLICATIVE
```
    Multiplicative operators precedence: *, /, %
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_POWER
```
static final int OPERATOR_PRECEDENCE_POWER
```
    Power operator precedence: ^
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_UNARY
```
static final int OPERATOR_PRECEDENCE_UNARY
```
    Unary operators precedence: + and - as prefix
    
    See Also:
    
    Constant Field Values
  - OPERATOR_PRECEDENCE_POWER_HIGHER
```
static final int OPERATOR_PRECEDENCE_POWER_HIGHER
```
    An optional higher power operator precedence, higher than the unary prefix, e.g. -2^2 equals to 4 or -4, depending on precedence configuration.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - getPrecedence
```
int getPrecedence()
```
    Returns:
    
    The operator's precedence.
  - isLeftAssociative
```
boolean isLeftAssociative()
```
    If operators with same precedence are evaluated from left to right.
    
    Returns:
    
    The associativity.
  - isPrefix
```
boolean isPrefix()
```
    If it is a prefix operator.
    
    Returns:
    
    true if it is a prefix operator.
  - isPostfix
```
boolean isPostfix()
```
    If it is a postfix operator.
    
    Returns:
    
    true if it is a postfix operator.
  - isInfix
```
boolean isInfix()
```
    If it is an infix operator.
    
    Returns:
    
    true if it is an infix operator.
  - getPrecedence
```
int getPrecedence(ExpressionConfiguration configuration)
```
    Called during parsing, can be implemented to return a customized precedence.
    
    Parameters:
    
    configuration - The expression configuration.
    
    Returns:
    
    The default precedence from the operator annotation, or a customized value.
  - isOperandLazy
```
boolean isOperandLazy()
```
    Checks if the operand is lazy.
    
    Returns:
    
    true if operands are defined as lazy.
  - evaluate
```
EvaluationValue evaluate(Expression expression,
                         Token operatorToken,
                         EvaluationValue... operands)
                  throws EvaluationException
```
    Performs the operator logic and returns an evaluation result.
    
    Parameters:
    
    expression - The expression, where this function is executed. Can be used to access the expression configuration.
    
    operatorToken - The operator token from the parsed expression.
    
    operands - The operands, one for prefix and postfix operators, two for infix operators.
    
    Returns:
    
    The evaluation result in form of a EvaluationValue.
    
    Throws:
    
    EvaluationException - In case there were problems during evaluation.

Interface OperatorIfc

Nested Class Summary

Field Summary

Method Summary

Field Detail

OPERATOR_PRECEDENCE_OR

OPERATOR_PRECEDENCE_AND

OPERATOR_PRECEDENCE_EQUALITY

OPERATOR_PRECEDENCE_COMPARISON

OPERATOR_PRECEDENCE_ADDITIVE

OPERATOR_PRECEDENCE_MULTIPLICATIVE

OPERATOR_PRECEDENCE_POWER

OPERATOR_PRECEDENCE_UNARY

OPERATOR_PRECEDENCE_POWER_HIGHER

Method Detail

getPrecedence

isLeftAssociative

isPrefix

isPostfix

isInfix

getPrecedence

isOperandLazy

evaluate