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Hibernate's core ORM functionality
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.query.criteria.internal.predicate;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.Predicate;
import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.ParameterRegistry;
import org.hibernate.query.criteria.internal.Renderable;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
/**
* A compound {@link Predicate predicate} is a grouping of other {@link Predicate predicates} in order to convert
* either a conjunction (logical AND) or a disjunction (logical OR).
*
* @author Steve Ebersole
*/
public class CompoundPredicate
extends AbstractPredicateImpl
implements Serializable {
private BooleanOperator operator;
private final List> expressions = new ArrayList>();
/**
* Constructs an empty conjunction or disjunction.
*
* @param criteriaBuilder The query builder from which this originates.
* @param operator Indicates whether this predicate will function
* as a conjunction or disjunction.
*/
public CompoundPredicate(CriteriaBuilderImpl criteriaBuilder, BooleanOperator operator) {
super( criteriaBuilder );
this.operator = operator;
}
/**
* Constructs a conjunction or disjunction over the given expressions.
*
* @param criteriaBuilder The query builder from which this originates.
* @param operator Indicates whether this predicate will function
* as a conjunction or disjunction.
* @param expressions The expressions to be grouped.
*/
public CompoundPredicate(
CriteriaBuilderImpl criteriaBuilder,
BooleanOperator operator,
Expression... expressions) {
this( criteriaBuilder, operator );
applyExpressions( expressions );
}
/**
* Constructs a conjunction or disjunction over the given expressions.
*
* @param criteriaBuilder The query builder from which this originates.
* @param operator Indicates whether this predicate will function
* as a conjunction or disjunction.
* @param expressions The expressions to be grouped.
*/
public CompoundPredicate(
CriteriaBuilderImpl criteriaBuilder,
BooleanOperator operator,
List> expressions) {
this( criteriaBuilder, operator );
applyExpressions( expressions );
}
private void applyExpressions(Expression... expressions) {
applyExpressions( Arrays.asList( expressions ) );
}
private void applyExpressions(List> expressions) {
this.expressions.clear();
this.expressions.addAll( expressions );
}
@Override
public BooleanOperator getOperator() {
return operator;
}
@Override
public List> getExpressions() {
return expressions;
}
@Override
public void registerParameters(ParameterRegistry registry) {
for ( Expression expression : getExpressions() ) {
Helper.possibleParameter( expression, registry );
}
}
@Override
public String render(RenderingContext renderingContext) {
return render( isNegated(), renderingContext );
}
@Override
public boolean isJunction() {
return true;
}
@Override
public String render(boolean isNegated, RenderingContext renderingContext) {
return render( this, renderingContext );
}
private String operatorTextWithSeparator() {
return operatorTextWithSeparator( this.getOperator() );
}
/**
* Create negation of compound predicate by using logic rules:
* 1. not (x || y) is (not x && not y)
* 2. not (x && y) is (not x || not y)
*/
@Override
public Predicate not() {
return new NegatedPredicateWrapper( this );
}
private void toggleOperator() {
this.operator = reverseOperator( this.operator );
}
public static BooleanOperator reverseOperator(BooleanOperator operator) {
return operator == BooleanOperator.AND
? BooleanOperator.OR
: BooleanOperator.AND;
}
public static String render(PredicateImplementor predicate, RenderingContext renderingContext) {
if ( ! predicate.isJunction() ) {
throw new IllegalStateException( "CompoundPredicate.render should only be used to render junctions" );
}
// for junctions, the negation is already cooked into the expressions and operator; we just need to render
// them as is
if ( predicate.getExpressions().isEmpty() ) {
boolean implicitTrue = predicate.getOperator() == BooleanOperator.AND;
// AND is always true for empty; OR is always false
return implicitTrue ? "1=1" : "0=1";
}
// single valued junction ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if ( predicate.getExpressions().size() == 1 ) {
return ( (Renderable) predicate.getExpressions().get( 0 ) ).render( renderingContext );
}
final StringBuilder buffer = new StringBuilder();
String sep = "";
for ( Expression expression : predicate.getExpressions() ) {
buffer.append( sep )
.append( "( " )
.append( ( (Renderable) expression ).render( renderingContext ) )
.append( " )" );
sep = operatorTextWithSeparator( predicate.getOperator() );
}
return buffer.toString();
}
private static String operatorTextWithSeparator(BooleanOperator operator) {
return operator == BooleanOperator.AND
? " and "
: " or ";
}
}