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/*
 * 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.drill.common.expression;

import org.apache.drill.common.expression.visitors.ExprVisitor;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.common.types.Types;

import java.util.Collections;
import java.util.Iterator;

public class AnyValueExpression extends LogicalExpressionBase implements Iterable{

  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(AnyValueExpression.class);

  public static final String ANY_VALUE = "any_value";
  private final LogicalExpression input;
  private final MajorType type;

  /**
   * @param input
   * @param pos
   */
  public AnyValueExpression(LogicalExpression input, ExpressionPosition pos) {
    super(pos);
    this.input = input;
    this.type = input.getMajorType();
  }

  @Override
  public  T accept(ExprVisitor visitor, V value) throws E {
    return visitor.visitAnyValueExpression(this, value);
  }

  @Override
  public Iterator iterator() {
    return Collections.singleton(input).iterator();
  }

  public LogicalExpression getInput() {
    return input;
  }

  @Override
  public MajorType getMajorType() {
    return type;
  }

  @Override
  public String toString() {
    return "AnyValueExpression [input=" + input + ", type=" + Types.toString(type) + "]";
  }
}