| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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. |
| */ |
| |
| package org.apache.tajo.algebra; |
| |
| import com.google.common.base.Objects; |
| import com.google.gson.annotations.Expose; |
| import com.google.gson.annotations.SerializedName; |
| import org.apache.tajo.util.TUtil; |
| |
| public class Relation extends Expr { |
| @Expose @SerializedName("TableName") |
| protected String tableName; |
| @Expose @SerializedName("TableAlias") |
| protected String alias; |
| |
| protected Relation(OpType type, String relationName) { |
| super(type); |
| this.tableName = relationName; |
| } |
| |
| public Relation(String relationName) { |
| this(OpType.Relation, relationName); |
| } |
| |
| public String getCanonicalName() { |
| return alias == null ? tableName : alias; |
| } |
| |
| public String getName() { |
| return tableName; |
| } |
| |
| public void setTableName(String tableName) { |
| this.tableName = tableName; |
| } |
| |
| public boolean hasAlias() { |
| return alias != null; |
| } |
| |
| public String getAlias() { |
| return this.alias; |
| } |
| |
| public void setAlias(String alias) { |
| this.alias = alias; |
| } |
| |
| @Override |
| public String toJson() { |
| return JsonHelper.toJson(this); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(tableName, alias); |
| } |
| |
| @Override |
| boolean equalsTo(Expr expr) { |
| Relation other = (Relation) expr; |
| return TUtil.checkEquals(tableName, other.tableName) && |
| TUtil.checkEquals(alias, other.alias); |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| Relation relation = (Relation) super.clone(); |
| relation.tableName = tableName; |
| relation.alias = alias; |
| return relation; |
| } |
| } |