/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed 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 com.linkedin.pinot.pql.parsers.pql2.ast;

import com.linkedin.pinot.common.request.FilterOperator;
import com.linkedin.pinot.common.utils.request.FilterQueryTree;
import com.linkedin.pinot.pql.parsers.Pql2CompilationException;
import java.util.Collections;


/**
 * AST for the BETWEEN PQL clause.
 */
public class BetweenPredicateAstNode extends PredicateAstNode {
  private String _identifier;

  @Override
  public void addChild(AstNode childNode) {
    if (childNode instanceof IdentifierAstNode) {
      IdentifierAstNode node = (IdentifierAstNode) childNode;
      _identifier = node.getName();
    } else {
      super.addChild(childNode);
    }
  }

  public String getIdentifier() {
    return _identifier;
  }

  @Override
  public String toString() {
    return "BetweenPredicateAstNode{" + "_identifier='" + _identifier + '\'' + '}';
  }

  @Override
  public FilterQueryTree buildFilterQueryTree() {
    if (getChildren().size() == 2) {
      try {
        LiteralAstNode left = (LiteralAstNode) getChildren().get(0);
        LiteralAstNode right = (LiteralAstNode) getChildren().get(1);
        return new FilterQueryTree(_identifier, Collections.singletonList("[" + left.getValueAsString() + "\t\t" + right.getValueAsString() + "]"),
            FilterOperator.RANGE, null);
      } catch (ClassCastException e) {
        throw new Pql2CompilationException("BETWEEN clause was expecting two literal AST nodes, got " +
            getChildren().get(0) + " and " + getChildren().get(1));
      }
    } else {
      throw new Pql2CompilationException("BETWEEN clause does not have two children nodes");
    }
  }
}