com.eteks.parser.node
Class ConditionNode

java.lang.Object
  |
  +--com.eteks.parser.node.ConditionNode

All Implemented Interfaces:

ExpressionNode, ParameterizedNode, java.io.Serializable

public class ConditionNode

extends java.lang.Object

implements ParameterizedNode

Node matching a condition.

Since:

Jeks 1.0

Version:

1.0

Author:

Emmanuel Puybaret

See Also:

Serialized Form

Constructor Summary

ConditionNode()

Method Summary

void	addParameter(ExpressionNode parameter) Stores the if, then and else expressions of this condition.
double	computeExpression(double[] parametersValue) Returns the computed value of then or else expressions depending on the computed value of the if expression.
java.lang.Object	computeExpression(Interpreter interpreter, java.lang.Object[] parametersValue) Returns the result of this condition.
ExpressionNode	getElseExpression() Returns the node matching the else expression.
ExpressionNode	getIfExpression() Returns the node matching the if expression.
int	getParameterCount() Returns the current count of parameters or operands stored by this node.
ExpressionNode	getThenExpression() Returns the node matching the then expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConditionNode

public ConditionNode()

Method Detail

addParameter

public void addParameter(ExpressionNode parameter)

Stores the if, then and else expressions of this condition.

Specified by:

addParameter in interface ParameterizedNode

Following copied from interface: com.eteks.parser.node.ParameterizedNode

Parameters:

parameter - the node of an expression used as parameter or operand.

getParameterCount

public int getParameterCount()

Description copied from interface: ParameterizedNode

Returns the current count of parameters or operands stored by this node.

Specified by:

getParameterCount in interface ParameterizedNode

Following copied from interface: com.eteks.parser.node.ParameterizedNode

Returns:

the count of parameters of this node.

getIfExpression

public ExpressionNode getIfExpression()

Returns the node matching the if expression.

Returns:

the node of an expression.

getThenExpression

public ExpressionNode getThenExpression()

Returns the node matching the then expression.

Returns:

the node of an expression.

getElseExpression

public ExpressionNode getElseExpression()

Returns the node matching the else expression.

Returns:

the node of an expression.

computeExpression

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

Returns the result of this condition.
If the supportsRecursiveCall () method of the interpreter returns true, the computed value of then or else expressions is returned depending on whether the isTrue () method of the interpreter returning true or not. The computed value of the if expression is passed as parameter to the isTrue () method.
If the supportsRecursiveCall () method returns false, this method returns the result of the getConditionValue () method of interpreter with the computed value of the if, then and else expressions as parameters.

Specified by:

computeExpression in interface ExpressionNode

Parameters:

interpreter - runtime interpreter.

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

Returns:

the computed value of the condition. The type of the returned value depends on the implementation of the interpreter.

See Also:

Interpreter.isTrue(java.lang.Object), Interpreter.getConditionValue(java.lang.Object, java.lang.Object, java.lang.Object)

computeExpression

public double computeExpression(double[] parametersValue)

Returns the computed value of then or else expressions depending on the computed value of the if expression. The if expression is compared to ConstantNode.FALSE_DOUBLE.

Specified by:

computeExpression in interface ExpressionNode

Parameters:

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

Returns:

the computed value of the condition.