| /** |
| * 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.plan.expr; |
| |
| import com.google.common.base.Objects; |
| import com.google.gson.annotations.Expose; |
| import org.apache.tajo.datum.Datum; |
| import org.apache.tajo.storage.Tuple; |
| import org.apache.tajo.type.Type; |
| import org.apache.tajo.type.TypeFactory; |
| |
| public class ConstEval extends EvalNode implements Comparable<ConstEval>, Cloneable { |
| @Expose Datum datum = null; |
| |
| public ConstEval(Datum datum) { |
| super(EvalType.CONST); |
| this.datum = datum; |
| } |
| |
| public Datum getValue() { |
| return this.datum; |
| } |
| |
| @Override |
| public String toString() { |
| return datum.toString(); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public Datum eval(Tuple tuple) { |
| super.eval(tuple); |
| return datum; |
| } |
| |
| @Override |
| public Type getValueType() { |
| return TypeFactory.create(datum.type()); |
| } |
| |
| @Override |
| public int childNum() { |
| return 0; |
| } |
| |
| @Override |
| public EvalNode getChild(int idx) { |
| return null; |
| } |
| |
| @Override |
| public String getName() { |
| return this.datum.toString(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof ConstEval) { |
| ConstEval other = (ConstEval) obj; |
| |
| if (this.type == other.type && this.datum.equals(other.datum)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(type, datum.type(), datum); |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| ConstEval eval = (ConstEval) super.clone(); |
| eval.datum = datum; |
| |
| return eval; |
| } |
| |
| @Override |
| public int compareTo(ConstEval other) { |
| return datum.compareTo(other.datum); |
| } |
| |
| @Override |
| public void preOrder(EvalNodeVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| public void postOrder(EvalNodeVisitor visitor) { |
| visitor.visit(this); |
| } |
| } |