Module spring.data.relational

Package org.springframework.data.relational.core.sql

Class Comparison

java.lang.Object

org.springframework.data.relational.core.sql.Comparison

All Implemented Interfaces:

Condition, Expression, Segment, Visitable

public class Comparison
extends Object
implements Condition

Comparing Condition comparing two Expressions.

Results in a rendered condition: <left> <comparator> <right> (e.g. col = 'predicate'.

Since:

1.1

Author:

Mark Paluch, Jens Schauder

Method Summary

Modifier and Type	Method	Description
static Comparison	create(String unqualifiedColumnName, String comparator, Object rightValue)	Creates a new Comparison from simple StringP arguments
static Comparison	create(Expression leftColumnOrExpression, String comparator, Expression rightColumnOrExpression)	Creates a new Comparison Condition given two Expressions.
boolean	equals(Object obj)	Check whether this Segment is equal to another Segment.
String	getComparator()
Expression	getLeft()
Expression	getRight()
int	hashCode()	Generate a hash code from thisSegment.
Condition	not()	Creates a Condition that negates this Condition.
String	toString()	Return a SQL string representation of this Segment.
void	visit(Visitor visitor)	Accept a Visitor visiting this Visitable and its nested Visitables if applicable.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.data.relational.core.sql.Condition

and, or

Methods inherited from interface org.springframework.data.relational.core.sql.Segment

equals, hashCode

Methods inherited from interface org.springframework.data.relational.core.sql.Visitable

visit

Method Details

create

public static Comparison create(Expression leftColumnOrExpression,
 String comparator,
 Expression rightColumnOrExpression)

Creates a new Comparison Condition given two Expressions.

Parameters:

leftColumnOrExpression - the left Expression.

comparator - the comparator.

rightColumnOrExpression - the right Expression.

Returns:

the Comparison condition.

create

public static Comparison create(String unqualifiedColumnName,
 String comparator,
 Object rightValue)

Creates a new Comparison from simple StringP arguments

Parameters:

unqualifiedColumnName - gets turned in a Expressions.just(String) and is expected to be an unqualified unique column name but also could be an verbatim expression. Must not be null.

comparator - must not be null.

rightValue - is considered a Literal. Must not be null.

Returns:

a new Comparison of the first with the third argument using the second argument as comparison operator. Guaranteed to be not null.

Since:

2.3

not

public Condition not()

Description copied from interface: Condition

Creates a Condition that negates this Condition.

Specified by:

not in interface Condition

Returns:

the negated Condition.

getLeft

public Expression getLeft()

Returns:

the left Expression.

getComparator

public String getComparator()

Returns:

the comparator.

getRight

public Expression getRight()

Returns:

the right Expression.

toString

public String toString()

Description copied from interface: Segment

Return a SQL string representation of this Segment.

The representation is intended for debugging purposes and an approximation to the generated SQL. While it might work in the context of a specific dialect, you should not assume that the Segment.toString() representation works across multiple databases.

Specified by:

toString in interface Segment

Returns:

a SQL string representation of this Segment.

visit

public void visit(Visitor visitor)

Description copied from interface: Visitable

Accept a Visitor visiting this Visitable and its nested Visitables if applicable.

Specified by:

visit in interface Visitable

Parameters:

visitor - the visitor to notify, must not be null.

hashCode

public int hashCode()

Description copied from interface: Segment

Generate a hash code from thisSegment.

Hashcode typically derives from the Segment.toString() representation so two Segments yield the same Segment.hashCode() if their Segment.toString() representation matches.

Specified by:

hashCode in interface Segment

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

equals

public boolean equals(@Nullable
 Object obj)

Description copied from interface: Segment

Check whether this Segment is equal to another Segment.

Equality is typically given if the Segment.toString() representation matches.

Specified by:

equals in interface Segment

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the other argument; false otherwise.