tajo-algebra/src/main/java/org/apache/tajo/algebra/WindowFunctionExpr.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 org.apache.tajo.util.TUtil;

public class WindowFunctionExpr extends Expr {
  // set function
  GeneralSetFunctionExpr function;

  // over clause - only one of both is used.
  private String windowName;
  private WindowSpecExpr windowSpec;

  public WindowFunctionExpr(GeneralSetFunctionExpr function) {
    super(OpType.WindowFunction);
    this.function = function;
  }

  public boolean hasWindowName() {
    return windowName != null;
  }

  public void setWindowName(String windowName) {
    this.windowName = windowName;
  }

  public String getWindowName() {
    return this.windowName;
  }

  public boolean hasWidowSpec() {
    return windowSpec != null;
  }

  public void setWindowSpec(WindowSpecExpr windowSpec) {
    this.windowSpec = windowSpec;
  }

  public WindowSpecExpr getWindowSpec() {
    return this.windowSpec;
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(windowName, windowSpec);
  }

  @Override
  boolean equalsTo(Expr expr) {
    return TUtil.checkEquals(windowName, windowSpec);
  }
}