com.eteks.parser.node
Interface ExpressionNode

All Superinterfaces:

java.io.Serializable

All Known Subinterfaces:

ParameterizedNode

All Known Implementing Classes:

ConstantNode, ExpressionParameterNode, FunctionParameterNode, LiteralNode

public interface ExpressionNode

extends java.io.Serializable

Interface implemented by the nodes of the tree of a compiled expression. This tree is built during the parsing of a function or of an expression, and is used at interpretation time to get its value. The computeExpression () methods of an instance of ExpressionNode computes the value of a node at interpretation time. One method uses the matching methods of its Interpreter parameter to compute the value of a node, and the other method computes double values directly.

Since:

Jeks 1.0

Version:

1.0

Author:

Emmanuel Puybaret

See Also:

Interpreter, CompiledFunction, CompiledExpression

Method Summary

double	computeExpression(double[] parametersValue) Returns the value of the expression matching this node.
java.lang.Object	computeExpression(Interpreter interpreter, java.lang.Object[] parametersValue) Returns the value of the expression matching this node.

Method Detail

computeExpression

public java.lang.Object computeExpression(Interpreter interpreter,
                                          java.lang.Object[] parametersValue)

Returns the value of the expression matching this node. This method can return a computed value returned by one of the methods of Interpreter, the value of a parameter of a function stored in the array parametersValue or any other type of value.

Parameters:

interpreter - the runtime interpreter used to compute of the value of the different literals, constants, operators and functions available in the Syntax interface

parametersValue - the value of parameters passed to compute a compiled function.

Returns:

the value of the expression.

See Also:

CompiledFunction

computeExpression

public double computeExpression(double[] parametersValue)

Returns the value of the expression matching this node. This method is implemented to compute directly the double value result of this node operation.

Parameters:

parametersValue - the value of parameters passed to compute a compiled function.

Returns:

the value of the expression.

See Also:

CompiledFunction