org.teiid.query.sql.lang
Class Criteria

java.lang.Object
  org.teiid.query.sql.lang.Criteria

All Implemented Interfaces:

Cloneable, LanguageObject, Expression

Direct Known Subclasses:

ExpressionCriteria, LogicalCriteria, PredicateCriteria

public abstract class Criteria
extends Object
implements Expression

This class represents the criteria clause for a query, which defines constraints on the data values to be retrieved for each parameter in the select clause.

Nested Class Summary

Nested classes/interfaces inherited from interface org.teiid.query.sql.LanguageObject

LanguageObject.Util

Constructor Summary

Criteria()
Constructs a default instance of this class.

Method Summary

static Criteria	applyDemorgan(Criteria input)
abstract Object	clone() Abstract clone method
static Criteria	combineCriteria(Criteria primaryCrit, Criteria additionalCrit) This utility method can be used to combine two criteria using an AND.
static Criteria	combineCriteria(Criteria primaryCrit, Criteria additionalCrit, boolean disjunctively)
static Criteria	combineCriteria(List parts)
Class<?>	getType() Get the return type of this expression.
boolean	isResolved() Return true if expression has been fully resolved.
static List<Criteria>	separateCriteriaByAnd(Criteria crit) This utility method will pull apart a tree of criteria by breaking all compound AND criteria apart.
String	toString() Return the parser string.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.teiid.query.sql.LanguageObject

acceptVisitor

Constructor Detail

Criteria

public Criteria()

Constructs a default instance of this class.

Method Detail

clone

public abstract Object clone()

Abstract clone method

Specified by:

clone in interface LanguageObject

Overrides:

clone in class Object

Returns:

Deep clone of this criteria

toString

public String toString()

Return the parser string.

Overrides:

toString in class Object

separateCriteriaByAnd

public static List<Criteria> separateCriteriaByAnd(Criteria crit)

This utility method will pull apart a tree of criteria by breaking all compound AND criteria apart. For instance, ((A=1 AND B=2) AND C=3) will be broken into A=1, B=2, C=3.

Parameters:

crit - Criteria to break apart

Returns:

List of Criteria, empty list if crit is null

combineCriteria

public static Criteria combineCriteria(List parts)

combineCriteria

public static Criteria combineCriteria(Criteria primaryCrit,
                                       Criteria additionalCrit)

This utility method can be used to combine two criteria using an AND. If both criteria are null, then null will be returned. If either is null, then the other will be returned. If neither is null and the primaryCrit is a CompoundCriteria, then the additionalCrit will be added to the primaryCrit and the primaryCrit will be returned. If the primaryCrit is not compound, a new CompoundCriteria will be created and both criteria will be added to it.

Parameters:

primaryCrit - Primary criteria - may be modified

additionalCrit - Won't be modified, but will likely be attached to the returned crit

Returns:

Combined criteria

combineCriteria

public static Criteria combineCriteria(Criteria primaryCrit,
                                       Criteria additionalCrit,
                                       boolean disjunctively)

applyDemorgan

public static Criteria applyDemorgan(Criteria input)

getType

public Class<?> getType()

Description copied from interface: Expression

Get the return type of this expression. This method will not necessarily work right before resolution (Expression.isResolved() returns true).

Specified by:

getType in interface Expression

Returns:

Java class name

isResolved

public boolean isResolved()

Description copied from interface: Expression

Return true if expression has been fully resolved. Typically the QueryResolver component will handle resolution of an expression.

Specified by:

isResolved in interface Expression

Returns:

True if resolved