Package com.mckoi.database

Class Operator

java.lang.Object

com.mckoi.database.Operator

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

Operator.AddOperator, Operator.AllOperator, Operator.AndOperator, Operator.AnyOperator, Operator.ConcatOperator, Operator.DivideOperator, Operator.EqualOperator, Operator.GreaterEqualOperator, Operator.GreaterOperator, Operator.IsNotOperator, Operator.IsOperator, Operator.LesserEqualOperator, Operator.LesserOperator, Operator.MultiplyOperator, Operator.NotEqualOperator, Operator.OrOperator, Operator.ParenOperator, Operator.PatternMatchFalseOperator, Operator.PatternMatchTrueOperator, Operator.RegexOperator, Operator.SimpleOperator, Operator.SubtractOperator

public abstract class Operator
extends java.lang.Object
implements java.io.Serializable

An operator for an expression.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	Operator.AddOperator
(package private) static class	Operator.AllOperator
(package private) static class	Operator.AndOperator
(package private) static class	Operator.AnyOperator
(package private) static class	Operator.ConcatOperator
(package private) static class	Operator.DivideOperator
(package private) static class	Operator.EqualOperator
(package private) static class	Operator.GreaterEqualOperator
(package private) static class	Operator.GreaterOperator
(package private) static class	Operator.IsNotOperator
(package private) static class	Operator.IsOperator
(package private) static class	Operator.LesserEqualOperator
(package private) static class	Operator.LesserOperator
(package private) static class	Operator.MultiplyOperator
(package private) static class	Operator.NotEqualOperator
(package private) static class	Operator.OrOperator
(package private) static class	Operator.ParenOperator
(package private) static class	Operator.PatternMatchFalseOperator
(package private) static class	Operator.PatternMatchTrueOperator
(package private) static class	Operator.RegexOperator
(package private) static class	Operator.SimpleOperator
(package private) static class	Operator.SubtractOperator

Field Summary

Fields

Modifier and Type	Field	Description
private static Operator.AddOperator	add_op
static int	ALL	The ANY and ALL enumerator.
private static java.util.HashMap	all_map
private static Operator.AndOperator	and_op
static int	ANY	The ANY and ALL enumerator.
private static java.util.HashMap	any_map
private static Operator.ConcatOperator	concat_op
private static Operator.DivideOperator	div_op
private static Operator.EqualOperator	eq_op
private static Operator.GreaterOperator	g_op
private static Operator.GreaterEqualOperator	geq_op
private static Operator	in_op
private static Operator.IsOperator	is_op
private static Operator.IsNotOperator	isn_op
private static Operator.LesserOperator	l_op
private static Operator.LesserEqualOperator	leq_op
private static Operator.PatternMatchTrueOperator	like_op
private static Operator.MultiplyOperator	mul_op
private static Operator.NotEqualOperator	neq_op
private static Operator	nin_op
private static Operator.PatternMatchFalseOperator	nlike_op
static int	NONE	The ANY and ALL enumerator.
private static Operator	not_op
private java.lang.String	op	A string that represents this operator.
private static Operator.OrOperator	or_op
private static Operator.ParenOperator	par1_op
private static Operator.ParenOperator	par2_op
private int	precedence	The precedence of this operator.
private static Operator.RegexOperator	regex_op
(package private) static long	serialVersionUID
private int	set_type	If this is a set operator such as ANY or ALL then this is set with the flag type.
private static Operator.SubtractOperator	sub_op

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Operator(java.lang.String op)	Constructs the Operator.
protected	Operator(java.lang.String op, int precedence)
protected	Operator(java.lang.String op, int precedence, int set_type)

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object ob)
abstract TObject	eval(TObject ob1, TObject ob2, GroupResolver group, VariableResolver resolver, QueryContext context)
static Operator	get(java.lang.String op)	Returns an Operator with the given string.
Operator	getSubQueryForm(int type)	Returns the ANY or ALL form of this operator.
Operator	getSubQueryForm(java.lang.String type_str)	Same as above only it handles the type as a string.
(package private) int	getSubQueryFormRepresentation()	Returns the sub query representation of this operator.
Operator	inverse()	Returns the inverse operator of this operator.
boolean	is(java.lang.String given_op)	Returns true if this operator is equal to the operator string.
boolean	isCondition()
boolean	isLogical()
boolean	isMathematical()
boolean	isNot()
boolean	isNotInversible()	Returns true if this operator is not inversible.
boolean	isPattern()
boolean	isSubQuery()
boolean	isSubQueryForm(int type)	Given a parameter of either NONE, ANY, ALL or SINGLE, this returns true if this operator is of the given type.
private static boolean	isTrue(TObject bool)	Returns true if the given TObject is a boolean and is true.
int	precedence()
TType	returnTType()	The type of object this Operator evaluates to.
Operator	reverse()	Returns an Operator that is the reverse of this Operator.
(package private) java.lang.String	stringRepresentation()	Returns the string value of this operator.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

static final long serialVersionUID

See Also:

Constant Field Values

NONE

public static final int NONE

The ANY and ALL enumerator.

See Also:

Constant Field Values

ANY

public static final int ANY

The ANY and ALL enumerator.

See Also:

Constant Field Values

ALL

public static final int ALL

The ANY and ALL enumerator.

See Also:

Constant Field Values

op

private java.lang.String op

A string that represents this operator.

set_type

private int set_type

If this is a set operator such as ANY or ALL then this is set with the flag type.

precedence

private int precedence

The precedence of this operator.

add_op

private static final Operator.AddOperator add_op

sub_op

private static final Operator.SubtractOperator sub_op

mul_op

private static final Operator.MultiplyOperator mul_op

div_op

private static final Operator.DivideOperator div_op

concat_op

private static final Operator.ConcatOperator concat_op

eq_op

private static final Operator.EqualOperator eq_op

neq_op

private static final Operator.NotEqualOperator neq_op

g_op

private static final Operator.GreaterOperator g_op

l_op

private static final Operator.LesserOperator l_op

geq_op

private static final Operator.GreaterEqualOperator geq_op

leq_op

private static final Operator.LesserEqualOperator leq_op

is_op

private static final Operator.IsOperator is_op

isn_op

private static final Operator.IsNotOperator isn_op

like_op

private static final Operator.PatternMatchTrueOperator like_op

nlike_op

private static final Operator.PatternMatchFalseOperator nlike_op

regex_op

private static final Operator.RegexOperator regex_op

in_op

private static final Operator in_op

nin_op

private static final Operator nin_op

not_op

private static final Operator not_op

and_op

private static final Operator.AndOperator and_op

or_op

private static final Operator.OrOperator or_op

par1_op

private static final Operator.ParenOperator par1_op

par2_op

private static final Operator.ParenOperator par2_op

any_map

private static final java.util.HashMap any_map

all_map

private static final java.util.HashMap all_map

Constructor Detail

Operator

protected Operator(java.lang.String op)

Constructs the Operator.

Operator

protected Operator(java.lang.String op,
                   int precedence)

Operator

protected Operator(java.lang.String op,
                   int precedence,
                   int set_type)

Method Detail

is

public boolean is(java.lang.String given_op)

Returns true if this operator is equal to the operator string.

eval

public abstract TObject eval(TObject ob1,
                             TObject ob2,
                             GroupResolver group,
                             VariableResolver resolver,
                             QueryContext context)

precedence

public int precedence()

isCondition

public boolean isCondition()

isMathematical

public boolean isMathematical()

isPattern

public boolean isPattern()

isLogical

public boolean isLogical()

isNot

public boolean isNot()

isSubQuery

public boolean isSubQuery()

reverse

public Operator reverse()

Returns an Operator that is the reverse of this Operator. This is used for reversing a conditional expression. eg. 9 > id becomes id < 9.

isNotInversible

public boolean isNotInversible()

Returns true if this operator is not inversible.

inverse

public Operator inverse()

Returns the inverse operator of this operator. For example, = becomes <>, > becomes <=, AND becomes OR.

isSubQueryForm

public boolean isSubQueryForm(int type)

Given a parameter of either NONE, ANY, ALL or SINGLE, this returns true if this operator is of the given type.

getSubQueryFormRepresentation

int getSubQueryFormRepresentation()

Returns the sub query representation of this operator.

getSubQueryForm

public Operator getSubQueryForm(int type)

Returns the ANY or ALL form of this operator.

getSubQueryForm

public Operator getSubQueryForm(java.lang.String type_str)

Same as above only it handles the type as a string.

returnTType

public TType returnTType()

The type of object this Operator evaluates to.

stringRepresentation

java.lang.String stringRepresentation()

Returns the string value of this operator.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object ob)

Overrides:

equals in class java.lang.Object

get

public static Operator get(java.lang.String op)

Returns an Operator with the given string.

isTrue

private static boolean isTrue(TObject bool)

Returns true if the given TObject is a boolean and is true. If the TObject is not a boolean value or is null or is false, then it returns false.