edu.cmu.aura.service
Class ExpressionUtil

java.lang.Object
  |
  +--edu.cmu.aura.service.ExpressionUtil

public class ExpressionUtil

extends java.lang.Object

ExpressionUtil provides convenience methods for dealing with expressions.

Constructor Summary

ExpressionUtil()

Method Summary

static java.lang.Object	parseEqExpression(ExpressionNode eNode, java.lang.StringBuffer attribName) Parses a key equality expression and finds the literal value specified.
static java.lang.Object	parseKeyEqExpression(ExpressionNode eNode, java.lang.String attribName, java.lang.Class literalClass) Parses a key equality expression and finds the literal value specified.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionUtil

public ExpressionUtil()

Method Detail

parseKeyEqExpression

public static java.lang.Object parseKeyEqExpression(ExpressionNode eNode,
                                                    java.lang.String attribName,
                                                    java.lang.Class literalClass)
                                             throws ExpressionNotSupportedException,
                                                    RequestException

Parses a key equality expression and finds the literal value specified. An exception is thrown if the expression is not a key equality expression, if the attribute name in the expression is incorrect, or if the type of the literal in the expression is incorrect.

Parameters:

eNode - the key equality expression

attribName - the name of the key attribute

literalClass - the type of literal value that is required

Returns:

the literal value specified in eNode for the key attribute

ExpressionNotSupportedException

RequestException

parseEqExpression

public static java.lang.Object parseEqExpression(ExpressionNode eNode,
                                                 java.lang.StringBuffer attribName)
                                          throws ExpressionNotSupportedException,
                                                 RequestException

Parses a key equality expression and finds the literal value specified. An exception is thrown if the expression is not a key equality expression, if the attribute name in the expression is incorrect.

Parameters:

eNode - the key equality expression

attribName - the name of the key attribute

Returns:

the literal value specified in eNode for the key attribute

ExpressionNotSupportedException

RequestException