/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate licenses
* this file to you 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.sql.tree;
import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import java.util.List;
public class Union
extends SetOperation {
private final List<Relation> relations;
private final boolean distinct;
public Union(List<Relation> relations, boolean distinct) {
Preconditions.checkNotNull(relations, "relations is null");
this.relations = ImmutableList.copyOf(relations);
this.distinct = distinct;
}
public List<Relation> getRelations() {
return relations;
}
public boolean isDistinct() {
return distinct;
}
@Override
public <R, C> R accept(AstVisitor<R, C> visitor, C context) {
return visitor.visitUnion(this, context);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("relations", relations)
.add("distinct", distinct)
.toString();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if ((obj == null) || (getClass() != obj.getClass())) {
return false;
}
Union o = (Union) obj;
return Objects.equal(relations, o.relations) &&
Objects.equal(distinct, o.distinct);
}
@Override
public int hashCode() {
return Objects.hashCode(relations, distinct);
}
}