Package com.mckoi.database.sql
Class Util
- java.lang.Object
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- com.mckoi.database.sql.Util
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public class Util extends java.lang.Object
Various utility methods for the iterpreter.- Author:
- Tobias Downer
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Constructor Summary
Constructors Constructor Description Util()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static java.lang.String
asNonQuotedRef(Token token)
Returns the Token as a non quoted reference.static java.lang.String
expressionListToString(Expression[] list)
Returns an array of Expression objects as a comma deliminated string.static Expression
normalize(Expression exp)
Normalizes the Expression by removing all NOT operators and altering the expression as appropriate.static TObject
parseNumberToken(Token token, boolean negative)
Parses a NUMBER_LITERAL Token with a sign boolean.static FunctionDef
resolveFunctionName(java.lang.String name, Expression[] exp_list)
Returns a Function object that represents the name and expression list (of parameters) of a function.static TObject
toArrayParamObject(Expression[] arr)
Converts an expression array to an array type that can be added to an expression.static java.lang.Object
toParamObject(Token token, boolean upper_identifiers)
Converts a Token which is either a STRING_LITERAL, NUMBER_LITERAL or IDENTIFIER into a Java Object.static TObject
zeroNumber()
Returns numeric 0
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Method Detail
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asNonQuotedRef
public static java.lang.String asNonQuotedRef(Token token)
Returns the Token as a non quoted reference. For example, a QUOTED_VARIABLE token will have the first and last '"' character removed. A QUOTED_DELIMINATED_REF will have " removed in each deliminated section. For example, '"re1"."re2"."a"' becomes 're1.re2.a" and '"re1.re2.a"' becomes 're1.re2.a'.
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toParamObject
public static java.lang.Object toParamObject(Token token, boolean upper_identifiers)
Converts a Token which is either a STRING_LITERAL, NUMBER_LITERAL or IDENTIFIER into a Java Object. If 'upper_identifiers' is true then all identifiers are made upper case before being returned (eg. if the object returns is a Variable object).
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zeroNumber
public static TObject zeroNumber()
Returns numeric 0
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parseNumberToken
public static TObject parseNumberToken(Token token, boolean negative)
Parses a NUMBER_LITERAL Token with a sign boolean.
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toArrayParamObject
public static TObject toArrayParamObject(Expression[] arr)
Converts an expression array to an array type that can be added to an expression.
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expressionListToString
public static java.lang.String expressionListToString(Expression[] list)
Returns an array of Expression objects as a comma deliminated string.
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normalize
public static Expression normalize(Expression exp)
Normalizes the Expression by removing all NOT operators and altering the expression as appropriate. For example, the expression; not ((a + b) = c and c = 5) would be normalized to; (a + b) <> c or c <> 5
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resolveFunctionName
public static FunctionDef resolveFunctionName(java.lang.String name, Expression[] exp_list)
Returns a Function object that represents the name and expression list (of parameters) of a function. Throws an exception if the function doesn't exist.
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