| /** |
| * 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 org.apache.tajo.algebra; |
| |
| import com.google.common.base.Objects; |
| import com.google.common.base.Preconditions; |
| import com.google.gson.annotations.Expose; |
| import com.google.gson.annotations.SerializedName; |
| import org.apache.tajo.util.TUtil; |
| |
| import java.util.Set; |
| |
| public class RelationList extends Expr { |
| @Expose @SerializedName("Relations") |
| private Expr[] relations; |
| |
| public RelationList(Expr[] relations) { |
| super(OpType.RelationList); |
| checkRelations(relations); |
| this.relations = relations; |
| } |
| |
| private void checkRelations(Expr[] relations) { |
| for (Expr rel : relations) { |
| Preconditions.checkArgument( |
| rel.getType() == OpType.Relation || |
| rel.getType() == OpType.Join || |
| rel.getType() == OpType.TablePrimaryTableSubQuery || |
| rel.getType() == OpType.SimpleTableSubquery, |
| "Only Relation, Join, or TablePrimarySubQuery can be given to RelationList, but this expr " |
| + " is " + rel.getType()); |
| } |
| } |
| |
| public Expr[] getRelations() { |
| return this.relations; |
| } |
| |
| public int size() { |
| return this.relations.length; |
| } |
| |
| @Override |
| public String toString() { |
| return toJson(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(relations); |
| } |
| |
| @Override |
| boolean equalsTo(Expr expr) { |
| Set<Expr> thisSet = TUtil.newHashSet(relations); |
| RelationList another = (RelationList) expr; |
| Set<Expr> anotherSet = TUtil.newHashSet(another.relations); |
| return thisSet.equals(anotherSet); |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| RelationList relationList = (RelationList) super.clone(); |
| relationList.relations = new Expr[relations.length]; |
| for (int i = 0; i < relations.length; i++) { |
| relationList.relations[i] = (Expr) relations[i].clone(); |
| } |
| return relationList; |
| } |
| } |