com.blazebit.persistence.criteria.impl.expression.CompoundPredicate Maven / Gradle / Ivy
/*
* Copyright 2014 - 2021 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.Expression;
import javax.persistence.criteria.Predicate;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class CompoundPredicate extends AbstractPredicate {
private static final long serialVersionUID = 1L;
private final BooleanOperator operator;
private final List> expressions;
public CompoundPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, BooleanOperator operator) {
super(criteriaBuilder, false);
this.operator = operator;
this.expressions = new ArrayList>();
}
@SafeVarargs
public CompoundPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, BooleanOperator operator, Expression... expressions) {
this(criteriaBuilder, operator);
Collections.addAll(this.expressions, expressions);
}
private CompoundPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, BooleanOperator operator, List> expressions) {
super(criteriaBuilder, false);
this.operator = operator;
this.expressions = expressions;
}
@Override
public BooleanOperator getOperator() {
return operator;
}
@Override
public List> getExpressions() {
return expressions;
}
@Override
public void visitParameters(ParameterVisitor visitor) {
for (Expression expression : expressions) {
visitor.visit(expression);
}
}
@Override
public void render(RenderContext context) {
List> exprs = expressions;
int size = exprs.size();
switch (size) {
case 0: {
if (operator == BooleanOperator.AND ^ isNegated()) {
context.getBuffer().append("1=1");
} else {
context.getBuffer().append("1=0");
}
break;
}
case 1: {
context.apply(exprs.get(0));
break;
}
default: {
final String operatorString = operator == BooleanOperator.AND ? " AND " : " OR ";
for (int i = 0; i < size; i++) {
if (i != 0) {
context.getBuffer().append(operatorString);
}
context.getBuffer().append('(');
context.apply(exprs.get(i));
context.getBuffer().append(')');
}
}
}
}
@Override
public AbstractPredicate copyNegated() {
BooleanOperator operator = getNegatedOperator();
List> list = new ArrayList>(expressions.size());
for (Expression expr : expressions) {
if (expr instanceof Predicate) {
list.add(((Predicate) expr).not());
}
}
return new CompoundPredicate(criteriaBuilder, operator, list);
}
private BooleanOperator getNegatedOperator() {
if (this.operator == BooleanOperator.AND) {
return BooleanOperator.OR;
} else {
return BooleanOperator.AND;
}
}
}