content: /*
   * 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.cassandra.fqltool;
  
  
  import java.util.List;
  import java.util.Objects;
  import java.util.UUID;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class ResultComparator
  {
      private static final Logger logger = LoggerFactory.getLogger(ResultComparator.class);
      private final MismatchListener mismatchListener;
  
      public ResultComparator()
      {
          this(null);
      }
  
      public ResultComparator(MismatchListener mismatchListener)
      {
          this.mismatchListener = mismatchListener;
      }
      /**
       * Compares the rows in rows
       * the row at position x in rows will have come from host at position x in targetHosts
       */
      public boolean compareRows(List<String> targetHosts, FQLQuery query, List<ResultHandler.ComparableRow> rows)
      {
          if (rows.size() < 2 || rows.stream().allMatch(Objects::isNull))
              return true;
  
          if (rows.stream().anyMatch(Objects::isNull))
          {
              handleMismatch(targetHosts, query, rows);
              return false;
          }
  
          ResultHandler.ComparableRow ref = rows.get(0);
          boolean equal = true;
          for (int i = 1; i < rows.size(); i++)
          {
              ResultHandler.ComparableRow compare = rows.get(i);
              if (!ref.equals(compare))
                  equal = false;
          }
          if (!equal)
              handleMismatch(targetHosts, query, rows);
          return equal;
      }
  
      /**
       * Compares the column definitions
       *
       * the column definitions at position x in cds will have come from host at position x in targetHosts
       */
      public boolean compareColumnDefinitions(List<String> targetHosts, FQLQuery query, List<ResultHandler.ComparableColumnDefinitions> cds)
      {
          if (cds.size() < 2)
              return true;
  
          boolean equal = true;
          List<ResultHandler.ComparableDefinition> refDefs = cds.get(0).asList();
          for (int i = 1; i < cds.size(); i++)
          {
              List<ResultHandler.ComparableDefinition> toCompare = cds.get(i).asList();
              if (!refDefs.equals(toCompare))
                  equal = false;
          }
          if (!equal)
              handleColumnDefMismatch(targetHosts, query, cds);
          return equal;
      }
  
      private void handleMismatch(List<String> targetHosts, FQLQuery query, List<ResultHandler.ComparableRow> rows)
      {
          UUID mismatchUUID = UUID.randomUUID();
          StringBuilder sb = new StringBuilder("{} - MISMATCH Query = {} ");
          for (int i = 0; i < targetHosts.size(); i++)
              sb.append("mismatch").append(i)
                .append('=')
                .append('"').append(targetHosts.get(i)).append(':').append(rows.get(i)).append('"')
                .append(',');
  
          logger.warn(sb.toString(), mismatchUUID, query);
          try
          {
              if (mismatchListener != null)
                  mismatchListener.mismatch(mismatchUUID, targetHosts, query, rows);
          }
          catch (Throwable t)
          {
              logger.error("ERROR notifying listener", t);
          }
      }
  
      private void handleColumnDefMismatch(List<String> targetHosts, FQLQuery query, List<ResultHandler.ComparableColumnDefinitions> cds)
      {
          UUID mismatchUUID = UUID.randomUUID();
          StringBuilder sb = new StringBuilder("{} - COLUMN DEFINITION MISMATCH Query = {} ");
          for (int i = 0; i < targetHosts.size(); i++)
              sb.append("mismatch").append(i)
                .append('=')
                .append('"').append(targetHosts.get(i)).append(':').append(columnDefinitionsString(cds.get(i))).append('"')
                .append(',');
  
          logger.warn(sb.toString(), mismatchUUID, query);
          try
          {
              if (mismatchListener != null)
                  mismatchListener.columnDefMismatch(mismatchUUID, targetHosts, query, cds);
          }
          catch (Throwable t)
          {
              logger.error("ERROR notifying listener", t);
          }
      }
  
      private String columnDefinitionsString(ResultHandler.ComparableColumnDefinitions cd)
      {
          StringBuilder sb = new StringBuilder();
          if (cd == null)
              sb.append("NULL");
          else if (cd.wasFailed())
              sb.append("FAILED");
          else
          {
              for (ResultHandler.ComparableDefinition def : cd)
              {
                  sb.append(def.toString());
              }
          }
          return sb.toString();
      }
  }
  