com.blazebit.persistence.parser.expression.AggregateExpression 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.parser.expression;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
*
* @author Christian Beikov
* @author Moritz Becker
* @since 1.0.0
*/
public class AggregateExpression extends FunctionExpression {
private boolean distinct;
public AggregateExpression(boolean distinct, String functionName, List expressions) {
super(functionName, expressions);
this.distinct = distinct;
}
/**
* Constructor for COUNT(*)
*/
public AggregateExpression() {
super("COUNT", Collections.emptyList());
this.distinct = false;
}
@Override
public AggregateExpression copy(ExpressionCopyContext copyContext) {
if (!distinct && expressions.isEmpty()) {
return new AggregateExpression();
} else {
int size = expressions.size();
List newExpressions = new ArrayList(size);
for (int i = 0; i < size; i++) {
newExpressions.add(expressions.get(i).copy(copyContext));
}
return new AggregateExpression(distinct, functionName, newExpressions);
}
}
public boolean isDistinct() {
return distinct;
}
public void setDistinct(boolean distinct) {
this.distinct = distinct;
}
@Override
public void accept(Visitor visitor) {
visitor.visit(this);
}
@Override
public T accept(ResultVisitor visitor) {
return visitor.visit(this);
}
}