com.cordys.bre.engine

Interface ExpressionInterpreter

public interface ExpressionInterpreter

Method Summary

Modifier and Type	Method and Description
void	addTokenToVectorExpressionTokens(java.util.Vector<ExpressionToken> tokVector, TokenConstants tokenConstant, java.lang.String value) This methods adds an ExpressionToken to the given vector of expression tokens of type "tokenConstant" and value "value"
boolean	evaluateExpression(java.lang.String expression, int objectsNode) This method evaluates the expression over the specified objects-context
void	evaluateXPathAssignment(java.lang.String lhsexpression, java.lang.String rhsexpression, int objectsNode, int metaObjectsNode) This method evaluates the rhs expression and puts the value in the lhs expression over the specified objects-context
boolean	evaluateXPathExpression(java.lang.String expression, int objectsNode, int metaObjectsNode) This method evaluates the xpath expression over the specified objects-context
java.util.Vector<ExpressionToken>	parseExpression(java.lang.String expression, Document document) This method is used to tokenize any expression i.e.

Method Detail

parseExpression

java.util.Vector<ExpressionToken> parseExpression(java.lang.String expression,
                                                  Document document)
                                           throws LexicalException

This method is used to tokenize any expression i.e. it breaks the expression into set of tokens.

Parameters:

expression - - the expression to be tokenized

document - - the document that is to be used to create element

Vector - - vector of ExpressionToken which has a type and a value associated with it. If error occurs during tokenizing then null is returned.

Throws:

LexicalException

evaluateExpression

boolean evaluateExpression(java.lang.String expression,
                           int objectsNode)
                    throws ExpressionEvaluationException

This method evaluates the expression over the specified objects-context

Returns:

true if the expression evaluates to true false if the expression evaluates to false

Throws:

EvalException - if any error occurs dring native evaluation

ExpressionEvaluationException

evaluateXPathExpression

boolean evaluateXPathExpression(java.lang.String expression,
                                int objectsNode,
                                int metaObjectsNode)
                         throws ExpressionEvaluationException

This method evaluates the xpath expression over the specified objects-context

Returns:

true if the expression evaluates to true false if the expression evaluates to false

Throws:

EvalException - if any error occurs dring native evaluation

ExpressionEvaluationException

evaluateXPathAssignment

void evaluateXPathAssignment(java.lang.String lhsexpression,
                             java.lang.String rhsexpression,
                             int objectsNode,
                             int metaObjectsNode)
                      throws ExpressionEvaluationException

This method evaluates the rhs expression and puts the value in the lhs expression over the specified objects-context

Throws:

RuleExecutionException - if any error occurs dring native evaluation

ExpressionEvaluationException

addTokenToVectorExpressionTokens

void addTokenToVectorExpressionTokens(java.util.Vector<ExpressionToken> tokVector,
                                      TokenConstants tokenConstant,
                                      java.lang.String value)

This methods adds an ExpressionToken to the given vector of expression tokens of type "tokenConstant" and value "value"