openjava.ptree
Class Literal

java.lang.Object
  |
  +--openjava.ptree.ParseTreeObject
        |
        +--openjava.ptree.Leaf
              |
              +--openjava.ptree.Literal

All Implemented Interfaces:

Cloneable, Expression, ParseTree, VariableInitializer

Direct Known Subclasses:

SubqueryFinder.RexExpression

public class Literal

extends Leaf

implements Expression

The Literal class represents a literal.

See Also:

Leaf, Expression

Field Summary

static int	BOOLEAN
static int	CHARACTER
private static Literal	constantEmptyString_
private static Literal	constantFalse_
private static Literal	constantNull_
private static Literal	constantOne_
private static Literal	constantTrue_
private static Literal	constantZero_
static int	DOUBLE
static int	FLOAT
protected int	id
static int	INTEGER
static int	LONG
static int	NULL
static int	STRING

Fields inherited from class openjava.ptree.Leaf

charBegin, line

Fields inherited from class openjava.ptree.ParseTreeObject

debugFlag, debugLevel, LN, out, writerStack

Constructor Summary

Literal(int id, String str)
Allocates a new object.

Method Summary

void	accept(ParseTreeVisitor v) Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.
static Literal	constantEmptyString()
static Literal	constantFalse()
static Literal	constantNull()
static Literal	constantOne()
static Literal	constantTrue()
static Literal	constantZero()
private static String	doubleQuoteString(String s)
int	getLiteralType()
OJClass	getType(Environment env)
static Literal	makeLiteral(boolean b) Makes a new object of Literal class from the boolean.
static Literal	makeLiteral(Boolean b)
static Literal	makeLiteral(char c) Makes a new object of Literal class from the character.
static Literal	makeLiteral(Character c)
static Literal	makeLiteral(double num) Makes a new object of Literal class from the number.
static Literal	makeLiteral(Double d)
static Literal	makeLiteral(float num) Makes a new object of Literal class from the number.
static Literal	makeLiteral(Float f)
static Literal	makeLiteral(int num) Makes a new object of Literal class from the number.
static Literal	makeLiteral(Integer n)
static Literal	makeLiteral(long num) Makes a new object of Literal class from the number.
static Literal	makeLiteral(Long n)
static Literal	makeLiteral(String str) Makes a new object of Literal class from the string.
private static String	singleQuoteChar(char c)
static String	stripString(String s) Given a double-quoted string, returns the string without double-quotes.

Methods inherited from class openjava.ptree.Leaf

childrenAccept, equals, equals, getRowType, getTokenID, makeCopy, makeRecursiveCopy, replaceChildWith, toString, writeCode

Methods inherited from class openjava.ptree.ParseTreeObject

clone, eq, eq, equal, flushPrintWriter, getDebugFlag, getNest, getObjectID, getParent, getPrintWriter, getTab, hashCode, lastObjectID, popNest, popPrintWriter, pushNest, pushPrintWriter, replace, setDebugFlag, setDebugLevel, setNest, setParent, setPrintStream, setTab, toFlattenString, writeDebug, writeDebugL, writeDebugLln, writeDebugln, writeDebugLR, writeDebugR, writeDebugRln, writeTab

Methods inherited from class java.lang.Object

equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface openjava.ptree.Expression

getRowType

Methods inherited from interface openjava.ptree.ParseTree

childrenAccept, eq, equals, getObjectID, makeCopy, makeRecursiveCopy, replace, toFlattenString, toString, writeCode

Field Detail

BOOLEAN

public static final int BOOLEAN

See Also:

getLiteralType(), Constant Field Values

INTEGER

public static final int INTEGER

See Also:

Constant Field Values

LONG

public static final int LONG

See Also:

Constant Field Values

FLOAT

public static final int FLOAT

See Also:

Constant Field Values

DOUBLE

public static final int DOUBLE

See Also:

Constant Field Values

CHARACTER

public static final int CHARACTER

See Also:

Constant Field Values

STRING

public static final int STRING

See Also:

Constant Field Values

NULL

public static final int NULL

See Also:

Constant Field Values

id

protected int id

constantTrue_

private static Literal constantTrue_

constantFalse_

private static Literal constantFalse_

constantNull_

private static Literal constantNull_

constantEmptyString_

private static Literal constantEmptyString_

constantZero_

private static Literal constantZero_

constantOne_

private static Literal constantOne_

Constructor Detail

Literal

public Literal(int id,
               String str)

Allocates a new object. If you want to make String literal like "test", call this constructor in the form :

     new Literal( Literal.STRING, "\"test\"" )
 

or use makeLiteral() static method.

Parameters:

id - the id number of the literal.

str - the literal as a String.

See Also:

makeLiteral(String)

Method Detail

makeLiteral

public static Literal makeLiteral(String str)

Makes a new object of Literal class from the string.

Parameters:

str - the string.

doubleQuoteString

private static String doubleQuoteString(String s)

makeLiteral

public static Literal makeLiteral(boolean b)

Makes a new object of Literal class from the boolean.

Parameters:

b - the boolean.

makeLiteral

public static Literal makeLiteral(Boolean b)

makeLiteral

public static Literal makeLiteral(char c)

Makes a new object of Literal class from the character.

Parameters:

c - the character.

singleQuoteChar

private static String singleQuoteChar(char c)

makeLiteral

public static Literal makeLiteral(Character c)

makeLiteral

public static Literal makeLiteral(int num)

Makes a new object of Literal class from the number.

Parameters:

num - the number.

makeLiteral

public static Literal makeLiteral(Integer n)

makeLiteral

public static Literal makeLiteral(long num)

Makes a new object of Literal class from the number.

Parameters:

num - the number.

makeLiteral

public static Literal makeLiteral(Long n)

makeLiteral

public static Literal makeLiteral(float num)

Makes a new object of Literal class from the number.

Parameters:

num - the number.

makeLiteral

public static Literal makeLiteral(Float f)

makeLiteral

public static Literal makeLiteral(double num)

Makes a new object of Literal class from the number.

Parameters:

num - the number.

makeLiteral

public static Literal makeLiteral(Double d)

getLiteralType

public int getLiteralType()

constantTrue

public static Literal constantTrue()

constantFalse

public static Literal constantFalse()

constantNull

public static Literal constantNull()

constantEmptyString

public static Literal constantEmptyString()

constantZero

public static Literal constantZero()

constantOne

public static Literal constantOne()

getType

public OJClass getType(Environment env)
                throws Exception

Specified by:

getType in interface Expression

Exception

accept

public void accept(ParseTreeVisitor v)
            throws ParseTreeException

Description copied from interface: ParseTree

Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.

This invoke an appropriate visit() method on the accepted visitor.

Specified by:

accept in interface ParseTree

Overrides:

accept in class Leaf

Parameters:

v - a visitor

ParseTreeException

stripString

public static String stripString(String s)

Given a double-quoted string, returns the string without double-quotes.