org.vedantatree.expressionoasis.expressions

Class IdentifierExpression

java.lang.Object

org.vedantatree.expressionoasis.expressions.IdentifierExpression

All Implemented Interfaces:

Expression

public class IdentifierExpression
extends Object
implements Expression

This is the expression for identifier. This identifier can be used as variable or any reference name to get the corresponding value.

Version:

1.0 Modified to support visitor design pattern., 1.1

Author:

Mohit Gupta, Parmod Kamboj, Kris Marwood

Constructor Summary

Constructors

Constructor and Description
IdentifierExpression()

Method Summary

Modifier and Type	Method and Description
void	accept(ExpressionVisitor visitor) Allows an expression visitor to visit this expression and it's sub-expressions (implements Visitor design pattern).
String	getIdentifierName() Gets the name of identifier.
Type	getReturnType() Gets the return type of the expression.
ValueObject	getValue() Executes and returns the value of this expression.
void	initialize(ExpressionContext expressionContext, Object parameters, boolean validate) Initializes the identifier name
String	toString()
void	uninitialize(ExpressionContext expressionContext) This is used to un-initialize the expression, so that expression can be reused.

Methods inherited from class java.lang.Object

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

Constructor Detail

IdentifierExpression

public IdentifierExpression()

Method Detail

getReturnType

public Type getReturnType()
                   throws ExpressionEngineException

Description copied from interface: Expression

Gets the return type of the expression.

Specified by:

getReturnType in interface Expression

Returns:

the type of expression

Throws:

ExpressionEngineException - If there is any problem during execution

See Also:

Expression.getReturnType()

getValue

public ValueObject getValue()
                     throws ExpressionEngineException

Description copied from interface: Expression

Executes and returns the value of this expression. If expression is not at node level, it will further evaluate its related expression which may represents operands or operators and return the final outcome.

Specified by:

getValue in interface Expression

Returns:

the value of expression (after expression evaluation)

Throws:

ExpressionEngineException - if there is any problem during execution

See Also:

Expression.getValue()

initialize

public void initialize(ExpressionContext expressionContext,
                       Object parameters,
                       boolean validate)
                throws ExpressionEngineException

Initializes the identifier name

Specified by:

initialize in interface Expression

Parameters:

expressionContext - contextual information, may help in initialization

parameters - for example, sub expressions and identifiers

Throws:

ExpressionEngineException - if there is any problem during execution

See Also:

org.vedantatree.expressionoasis.expressions.Expression#initialize(org.vedantatree.expressionoasis.ExpressionContext, java.lang.Object)

getIdentifierName

public String getIdentifierName()

Gets the name of identifier.

Returns:

Returns the identifierName.

uninitialize

public void uninitialize(ExpressionContext expressionContext)

Description copied from interface: Expression

This is used to un-initialize the expression, so that expression can be reused.

Specified by:

uninitialize in interface Expression

Parameters:

expressionContext - contextual information, may help in un-initialization

See Also:

Expression.uninitialize(org.vedantatree.expressionoasis.ExpressionContext)

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()

accept

public void accept(ExpressionVisitor visitor)

Allows an expression visitor to visit this expression and it's sub-expressions (implements Visitor design pattern).

Specified by:

accept in interface Expression

Parameters:

visitor - a visitor object that this expression must visit when accept is called.

See Also:

org.vedantatree.expressionoasis.expressions.Expression#accept(org.vedantatree.expressionoasis.ExpressionVisitor)