Class Expression

java.lang.Object

com.igormaznitsa.jcp.expression.Expression

public class Expression
extends Object

The main class to calculate expressions

Field Summary

Fields

Modifier and Type	Field	Description
private final PreprocessorContext	context	The variable contains the preprocessor context for the expression, it can be null
private final ExpressionTree	expressionTree	The variable contains the expression tree
private static final Class<?>[]	OPERATOR_SIGNATURE_1	Precreated array for speed up operations
private static final Class<?>[]	OPERATOR_SIGNATURE_2	Precreated array for speed up operations

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Expression(PreprocessorContext context, ExpressionTree tree)

Method Summary

Modifier and Type	Method	Description
private ExpressionTreeElement	calculateTreeElement(ExpressionTreeElement element, PreprocessingState state)
private Value	eval(PreprocessingState state)
static Value	evalExpression(String expression, PreprocessorContext context)	Evaluate expression
private ExpressionTreeElement	evalFunction(ExpressionTreeElement functionElement, PreprocessingState state)
private ExpressionTreeElement	evalOperator(ExpressionTreeElement operatorElement, PreprocessingState state)
static Value	evalTree(ExpressionTree tree, PreprocessorContext context)	Evaluate an expression tree

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

OPERATOR_SIGNATURE_1

private static final Class<?>[] OPERATOR_SIGNATURE_1

Precreated array for speed up operations

OPERATOR_SIGNATURE_2

private static final Class<?>[] OPERATOR_SIGNATURE_2

Precreated array for speed up operations

context

private final PreprocessorContext context

The variable contains the preprocessor context for the expression, it can be null

expressionTree

private final ExpressionTree expressionTree

The variable contains the expression tree

Constructor Details

Expression

private Expression(PreprocessorContext context,
 ExpressionTree tree)

Method Details

evalExpression

public static Value evalExpression(String expression,
 PreprocessorContext context)

Evaluate expression

Parameters:

expression - the expression as a String, must not be null

context - a preprocessor context to be used for expression operations

Returns:

the result as a Value object, it can't be null

evalTree

public static Value evalTree(ExpressionTree tree,
 PreprocessorContext context)

Evaluate an expression tree

Parameters:

tree - an expression tree, it must not be null

context - a preprocessor context to be used for expression operations

Returns:

the result as a Value object, it can't be null

evalFunction

private ExpressionTreeElement evalFunction(ExpressionTreeElement functionElement,
 PreprocessingState state)

evalOperator

private ExpressionTreeElement evalOperator(ExpressionTreeElement operatorElement,
 PreprocessingState state)

calculateTreeElement

private ExpressionTreeElement calculateTreeElement(ExpressionTreeElement element,
 PreprocessingState state)

eval

private Value eval(PreprocessingState state)