com.blazebit.persistence.criteria.impl.expression.ExistsPredicate Maven / Gradle / Ivy
/*
* Copyright 2014 - 2020 Blazebit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.blazebit.persistence.criteria.impl.expression;
import com.blazebit.persistence.criteria.impl.BlazeCriteriaBuilderImpl;
import com.blazebit.persistence.criteria.impl.ParameterVisitor;
import com.blazebit.persistence.criteria.impl.RenderContext;
import javax.persistence.criteria.Subquery;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class ExistsPredicate extends AbstractSimplePredicate {
private static final long serialVersionUID = 1L;
private final Subquery subquery;
public ExistsPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, Subquery subquery) {
this(criteriaBuilder, false, subquery);
}
private ExistsPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, boolean negated, Subquery subquery) {
super(criteriaBuilder, negated);
this.subquery = subquery;
}
@Override
public AbstractPredicate copyNegated() {
return new ExistsPredicate(criteriaBuilder, !isNegated(), subquery);
}
@Override
public void visitParameters(ParameterVisitor visitor) {
// no-op
}
@Override
public void render(RenderContext context) {
if (isNegated()) {
context.getBuffer().append("NOT ");
}
context.getBuffer().append("EXISTS ");
context.apply(subquery);
}
}