org.eigenbase.sql
Class SqlCharStringLiteral

java.lang.Object
  org.eigenbase.sql.SqlNode
      org.eigenbase.sql.SqlLiteral
          org.eigenbase.sql.SqlAbstractStringLiteral
              org.eigenbase.sql.SqlCharStringLiteral

All Implemented Interfaces:

Cloneable

public class SqlCharStringLiteral
extends SqlAbstractStringLiteral

A character string literal.

Its SqlLiteral.value field is an NlsString and SqlLiteral.typeName is SqlTypeName.CHAR.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/SqlCharStringLiteral.java#15 $

Author:

wael

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.sql.SqlLiteral

SqlLiteral.SqlSymbol

Field Summary

Fields inherited from class org.eigenbase.sql.SqlLiteral

value

Fields inherited from class org.eigenbase.sql.SqlNode

emptyArray

Constructor Summary

protected

SqlCharStringLiteral(NlsString val, SqlParserPos pos)

Method Summary

SqlNode	clone(SqlParserPos pos) Clones a SqlNode with a different position.
protected SqlAbstractStringLiteral	concat1(SqlLiteral[] lits) Helper routine for SqlUtil.concatenateLiterals(org.eigenbase.sql.SqlLiteral[]).
SqlCollation	getCollation()
NlsString	getNlsString()
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, createSqlType, createSymbol, createTime, createTimestamp, createUnknown, equals, equalsDeep, getKind, getMonotonicity, getStringValue, getTypeName, getValue, hashCode, intValue, longValue, sampleValue, stringValue, symbolValue, toValue, 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

Constructor Detail

SqlCharStringLiteral

protected SqlCharStringLiteral(NlsString val,
                               SqlParserPos pos)

Method Detail

getNlsString

public NlsString getNlsString()

Returns:

the underlying NlsString

getCollation

public SqlCollation getCollation()

Returns:

the collation

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

concat1

protected SqlAbstractStringLiteral concat1(SqlLiteral[] lits)

Description copied from class: SqlAbstractStringLiteral

Helper routine for SqlUtil.concatenateLiterals(org.eigenbase.sql.SqlLiteral[]).

Specified by:

concat1 in class SqlAbstractStringLiteral

Parameters:

lits - homogeneous StringLiteral[] args.

Returns:

StringLiteral with concatenated value. this == lits[0], used only for method dispatch.