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A columnar file format designed for time-series data
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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.iotdb.tsfile.read.expression;

import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.common.Path;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class QueryExpression implements Serializable {

  private List selectedSeries;
  private List dataTypes;
  private IExpression expression;
  private boolean hasQueryFilter;

  private QueryExpression() {
    selectedSeries = new ArrayList<>();
    hasQueryFilter = false;
  }

  public static QueryExpression create() {
    return new QueryExpression();
  }

  public static QueryExpression create(List selectedSeries, IExpression expression) {
    QueryExpression ret = new QueryExpression();
    ret.selectedSeries = selectedSeries;
    ret.expression = expression;
    ret.hasQueryFilter = expression != null;
    return ret;
  }

  public QueryExpression addSelectedPath(Path path) {
    this.selectedSeries.add(path);
    return this;
  }

  public QueryExpression setSelectSeries(List selectedSeries) {
    this.selectedSeries = selectedSeries;
    return this;
  }

  public IExpression getExpression() {
    return expression;
  }

  public QueryExpression setExpression(IExpression expression) {
    if (expression != null) {
      this.expression = expression;
      hasQueryFilter = true;
    }
    return this;
  }

  public List getSelectedSeries() {
    return selectedSeries;
  }

  @Override
  public String toString() {
    StringBuilder stringBuilder =
        new StringBuilder("\n\t[Selected Series]:")
            .append(selectedSeries)
            .append("\n\t[TSDataType]:")
            .append(dataTypes)
            .append("\n\t[expression]:")
            .append(expression);
    return stringBuilder.toString();
  }

  public boolean hasQueryFilter() {
    return hasQueryFilter;
  }

  public List getDataTypes() {
    return dataTypes;
  }

  public QueryExpression setDataTypes(List dataTypes) {
    this.dataTypes = dataTypes;
    return this;
  }
}