| /** |
| * 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 Projection extends UnaryOperator implements Cloneable { |
| @Expose @SerializedName("IsDistinct") |
| private boolean distinct = false; |
| @Expose @SerializedName("Projections") |
| private NamedExpr[] targets; |
| |
| public Projection() { |
| super(OpType.Projection); |
| } |
| |
| public int size() { |
| return targets.length; |
| } |
| |
| public boolean isDistinct() { |
| return distinct; |
| } |
| |
| public void setDistinct() { |
| distinct = true; |
| } |
| |
| public NamedExpr[] getNamedExprs() { |
| return this.targets; |
| } |
| |
| public void setNamedExprs(NamedExpr[] targets) { |
| this.targets = targets; |
| } |
| |
| public int hashCode() { |
| return Objects.hashCode(distinct, Objects.hashCode(targets), getChild()); |
| } |
| |
| @Override |
| boolean equalsTo(Expr expr) { |
| Projection another = (Projection) expr; |
| return distinct == another.distinct && |
| TUtil.checkEquals(targets, another.targets); |
| } |
| |
| @Override |
| public String toJson() { |
| return JsonHelper.toJson(this); |
| } |
| |
| @Override |
| public Projection clone() throws CloneNotSupportedException { |
| Projection projection = (Projection)super.clone(); |
| projection.distinct = distinct; |
| if (targets != null) { |
| projection.targets = new NamedExpr[targets.length]; |
| for (int i = 0; i < targets.length; i++) { |
| projection.targets[i] = targets[i].clone(); |
| } |
| } |
| |
| return projection; |
| } |
| } |