org.eigenbase.sql
Class SqlNumericLiteral

java.lang.Object
  extended by org.eigenbase.sql.SqlNode
      extended by org.eigenbase.sql.SqlLiteral
          extended by org.eigenbase.sql.SqlNumericLiteral
All Implemented Interfaces:
Cloneable

public class SqlNumericLiteral
extends SqlLiteral

A numeric SQL literal.

Since:
Nov 18, 2004
Version:
$Id: //open/dev/farrago/src/org/eigenbase/sql/SqlNumericLiteral.java#16 $
Author:
jhyde

Nested Class Summary
 
Nested classes/interfaces inherited from class org.eigenbase.sql.SqlLiteral
SqlLiteral.SqlSymbol
 
Field Summary
private  boolean isExact
           
private  Integer prec
           
private  Integer scale
           
 
Fields inherited from class org.eigenbase.sql.SqlLiteral
value
 
Fields inherited from class org.eigenbase.sql.SqlNode
emptyArray
 
Constructor Summary
protected SqlNumericLiteral(BigDecimal value, Integer prec, Integer scale, boolean isExact, SqlParserPos pos)
           
 
Method Summary
 SqlNode clone(SqlParserPos pos)
          Clones a SqlNode with a different position.
 RelDataType createSqlType(RelDataTypeFactory typeFactory)
           
 Integer getPrec()
           
 Integer getScale()
           
 boolean isExact()
           
 boolean isInteger()
           
 String toValue()
          For calc program builder - value may be different than SqlLiteral.unparse(org.eigenbase.sql.SqlWriter, int, int) Typical values: Hello, world! 12.34 {null} 1969-04-29
 void unparse(SqlWriter writer, int leftPrec, int rightPrec)
          Writes a SQL representation of this node to a writer.
 
Methods inherited from class org.eigenbase.sql.SqlLiteral
accept, bigDecimalValue, booleanValue, createApproxNumeric, createBinaryString, createBinaryString, createBoolean, createCharString, createCharString, createDate, createExactNumeric, createInterval, createNegative, createNull, createSample, createSymbol, createTime, createTimestamp, createUnknown, equals, equalsDeep, getKind, getMonotonicity, getStringValue, getTypeName, getValue, hashCode, intValue, longValue, sampleValue, stringValue, symbolValue, unescapeUnicode, validate, valueMatchesType
 
Methods inherited from class org.eigenbase.sql.SqlNode
clone, cloneArray, equalDeep, findValidOptions, getParserPosition, isA, toSqlString, toSqlString, toString, validateExpr
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

prec

private Integer prec

scale

private Integer scale

isExact

private boolean isExact
Constructor Detail

SqlNumericLiteral

protected SqlNumericLiteral(BigDecimal value,
                            Integer prec,
                            Integer scale,
                            boolean isExact,
                            SqlParserPos pos)
Method Detail

getPrec

public Integer getPrec()

getScale

public Integer getScale()

isExact

public boolean isExact()

clone

public SqlNode clone(SqlParserPos pos)
Description copied from class: SqlNode
Clones a SqlNode with a different position.

Overrides:
clone in class SqlLiteral

unparse

public void unparse(SqlWriter writer,
                    int leftPrec,
                    int rightPrec)
Description copied from class: SqlNode
Writes a SQL representation of this node to a writer.

The leftPrec and rightPrec parameters give us enough context to decide whether we need to enclose the expression in parentheses. For example, we need parentheses around "2 + 3" if preceded by "5 *". This is because the precedence of the "*" operator is greater than the precedence of the "+" operator.

The algorithm handles left- and right-associative operators by giving them slightly different left- and right-precedence.

If SqlWriter.isAlwaysUseParentheses() is true, we use parentheses even when they are not required by the precedence rules.

For the details of this algorithm, see SqlCall.unparse(org.eigenbase.sql.SqlWriter, int, int).

Overrides:
unparse in class SqlLiteral
Parameters:
writer - Target writer
leftPrec - The precedence of the SqlNode immediately preceding this node in a depth-first scan of the parse tree
rightPrec - The precedence of the SqlNode immediately

toValue

public String toValue()
Description copied from class: SqlLiteral
For calc program builder - value may be different than SqlLiteral.unparse(org.eigenbase.sql.SqlWriter, int, int) Typical values:

Overrides:
toValue in class SqlLiteral
Returns:
string representation of the value

createSqlType

public RelDataType createSqlType(RelDataTypeFactory typeFactory)
Overrides:
createSqlType in class SqlLiteral

isInteger

public boolean isInteger()