com.wewebu.expression.language
Class OwExprLiteral

java.lang.Object
  com.wewebu.expression.language.OwExprExpression
      com.wewebu.expression.language.OwExprLiteral

All Implemented Interfaces:

OwExprPrimaryPrefix

Direct Known Subclasses:

OwExprBooleanLiteral, OwExprFloatingPointLiteral, OwExprIntegerLiteral, OwExprNullLiteral, OwExprStringLiteral

public abstract class OwExprLiteral
extends OwExprExpression
implements OwExprPrimaryPrefix

An expression representing a fixed value (egg. strings , numeric values so.)

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All rights reserved.

For licensing information read the license.txt file or
go to: http://wiki.alfresco.com

See Also:

OwExprParser, OwExprValue

Field Summary

protected OwExprConstantSymbol

m_symbol

Fields inherited from class com.wewebu.expression.language.OwExprExpression

m_errorTable, m_symbolTable, m_typeError

Constructor Summary

OwExprLiteral(String symbolName_p, OwExprValue value_p, OwExprType symbolType_p, OwExprSymbolTable symbolTable_p, OwExprErrorTable errorTable_p)
Constructor

Method Summary

OwExprValue	evaluate(OwExprScope scope_p) Evaluates this expression on the OwExprScope (scope) provided as argument.
OwExprExpression	expression()
OwExprValue	getValue()
OwExprFunctionSymbol	regressToFunction() Forces this primary prefix symbol to a function.
OwExprPropertySymbol	regressToPorperty() Forces this primary prefix symbol to a property.
OwExprSymbolScope	regressToScope() Forces this primary prefix to a scope symbol.
protected static OwExprConstantSymbol	symbolInstance(String image_p, OwExprSymbolTable symbolTable_p, OwExprErrorTable errorTable_p) Constant symbol single flyweight instance accessor.
String	toString()
OwExprExpressionType	type() Type check method.

Methods inherited from class com.wewebu.expression.language.OwExprExpression

errCount, evaluate, evaluate, getErrorTable, getSymbol, getSymbolTable, hasErrors, initType, symbolsVisibleInScopes

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

m_symbol

protected OwExprConstantSymbol m_symbol

Constructor Detail

OwExprLiteral

public OwExprLiteral(String symbolName_p,
                     OwExprValue value_p,
                     OwExprType symbolType_p,
                     OwExprSymbolTable symbolTable_p,
                     OwExprErrorTable errorTable_p)

Constructor

Parameters:

symbolName_p - the name of the symbol this literal relays on

value_p - the value of this literal

symbolType_p - the type of the symbol

symbolTable_p - the global symbol table

errorTable_p - the global error table

Method Detail

symbolInstance

protected static final OwExprConstantSymbol symbolInstance(String image_p,
                                                           OwExprSymbolTable symbolTable_p,
                                                           OwExprErrorTable errorTable_p)

Constant symbol single flyweight instance accessor. If the symbol is not a constant symbol an error is added to the global error table.

Parameters:

image_p - the constant symbol image

symbolTable_p - the global symbol table

errorTable_p - the global error table

Returns:

a single symbol instance for the designated image_p or null if no such instance exists

type

public final OwExprExpressionType type()
                                throws OwExprTypeMissmatchException

Description copied from class: OwExprExpression

Type check method. If type errors are encountered during type computation the OwExprExpression.m_typeError should be set to true

Specified by:

type in class OwExprExpression

Returns:

the type of this symbol

Throws:

OwExprTypeMissmatchException

getValue

public final OwExprValue getValue()

Returns:

the value of this symbol

evaluate

public final OwExprValue evaluate(OwExprScope scope_p)
                           throws OwExprEvaluationException

Description copied from class: OwExprExpression

Evaluates this expression on the OwExprScope (scope) provided as argument.

Specified by:

evaluate in class OwExprExpression

Parameters:

scope_p -

Returns:

the value of this symbol

Throws:

OwExprEvaluationException

regressToPorperty

public final OwExprPropertySymbol regressToPorperty()
                                             throws OwExprTypeMissmatchException

Description copied from interface: OwExprPrimaryPrefix

Forces this primary prefix symbol to a property.

Specified by:

regressToPorperty in interface OwExprPrimaryPrefix

Returns:

N/A

Throws:

OwExprTypeMissmatchException - always

regressToFunction

public final OwExprFunctionSymbol regressToFunction()
                                             throws OwExprTypeMissmatchException

Description copied from interface: OwExprPrimaryPrefix

Forces this primary prefix symbol to a function.

Specified by:

regressToFunction in interface OwExprPrimaryPrefix

Returns:

N/A

Throws:

OwExprTypeMissmatchException - always

regressToScope

public OwExprSymbolScope regressToScope()
                                 throws OwExprTypeMissmatchException

Description copied from interface: OwExprPrimaryPrefix

Forces this primary prefix to a scope symbol.

Specified by:

regressToScope in interface OwExprPrimaryPrefix

Returns:

an OwExprSymbolScope based on this literals symbol

Throws:

OwExprTypeMissmatchException - if a type mismatch is detected during scope symbol creation

expression

public final OwExprExpression expression()

Specified by:

expression in interface OwExprPrimaryPrefix

Returns:

this literal

toString

public String toString()

Overrides:

toString in class Object