tajo-algebra/src/main/java/org/apache/tajo/algebra/UnaryOperator.java

/**
 * 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;

public abstract class UnaryOperator extends Expr {
  @Expose @SerializedName("Expr")
  private Expr child;

  public UnaryOperator(OpType type) {
    super(type);
  }

  public Expr getChild() {
    return this.child;
  }

  public boolean hasChild() {
    return child != null;
  }

  public void setChild(Expr op) {
    this.child = op;
  }

  public int hashCode() {
    return Objects.hashCode(getType(), child.hashCode());
  }

  @Override
  public Object clone() throws CloneNotSupportedException {
    UnaryOperator unaryOperator = (UnaryOperator) super.clone();
    if (child != null) {
      unaryOperator.child = (Expr) child.clone();
    }
    return unaryOperator;
  }
}