| /** |
| * 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.engine.planner; |
| |
| import org.apache.tajo.catalog.Schema; |
| import org.apache.tajo.engine.eval.EvalNode; |
| import org.apache.tajo.storage.Tuple; |
| |
| public class Projector { |
| private final Schema inSchema; |
| |
| // for projection |
| private final int targetNum; |
| private final EvalNode[] evals; |
| |
| public Projector(Schema inSchema, Schema outSchema, Target [] targets) { |
| this.inSchema = inSchema; |
| if (targets == null) { |
| targets = PlannerUtil.schemaToTargets(outSchema); |
| } |
| this.targetNum = targets.length; |
| evals = new EvalNode[targetNum]; |
| for (int i = 0; i < targetNum; i++) { |
| evals[i] = targets[i].getEvalTree(); |
| } |
| } |
| |
| public void eval(Tuple in, Tuple out) { |
| if (targetNum > 0) { |
| for (int i = 0; i < evals.length; i++) { |
| out.put(i, evals[i].eval(inSchema, in)); |
| } |
| } |
| } |
| } |