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.nio.ByteBuffer;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Objects;
  import java.util.stream.Collectors;
  
  import com.google.common.collect.AbstractIterator;
  
  import com.datastax.driver.core.ColumnDefinitions;
  import com.datastax.driver.core.ResultSet;
  import com.datastax.driver.core.Row;
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  
  /**
   * Wraps a result set from the driver so that we can reuse the compare code when reading
   * up a result set produced by ResultStore.
   */
  public class DriverResultSet implements ResultHandler.ComparableResultSet
  {
      private final ResultSet resultSet;
      private final Throwable failureException;
  
      public DriverResultSet(ResultSet resultSet)
      {
          this(resultSet, null);
      }
  
      private DriverResultSet(ResultSet res, Throwable failureException)
      {
          resultSet = res;
          this.failureException = failureException;
      }
  
      public static DriverResultSet failed(Throwable ex)
      {
          return new DriverResultSet(null, ex);
      }
  
      public ResultHandler.ComparableColumnDefinitions getColumnDefinitions()
      {
          if (wasFailed())
              return new DriverColumnDefinitions(null, true, failureException);
  
          return new DriverColumnDefinitions(resultSet.getColumnDefinitions());
      }
  
      public boolean wasFailed()
      {
          return failureException != null;
      }
  
      public Throwable getFailureException()
      {
          return failureException;
      }
  
      public Iterator<ResultHandler.ComparableRow> iterator()
      {
          if (wasFailed())
              return Collections.emptyListIterator();
          return new AbstractIterator<ResultHandler.ComparableRow>()
          {
              Iterator<Row> iter = resultSet.iterator();
              protected ResultHandler.ComparableRow computeNext()
              {
                  if (iter.hasNext())
                      return new DriverRow(iter.next());
                  return endOfData();
              }
          };
      }
  
      public static class DriverRow implements ResultHandler.ComparableRow
      {
          private final Row row;
  
          public DriverRow(Row row)
          {
              this.row = row;
          }
  
          public ResultHandler.ComparableColumnDefinitions getColumnDefinitions()
          {
              return new DriverColumnDefinitions(row.getColumnDefinitions());
          }
  
          public ByteBuffer getBytesUnsafe(int i)
          {
              return row.getBytesUnsafe(i);
          }
  
          @Override
          public boolean equals(Object oo)
          {
              if (!(oo instanceof ResultHandler.ComparableRow))
                  return false;
  
              ResultHandler.ComparableRow o = (ResultHandler.ComparableRow)oo;
              if (getColumnDefinitions().size() != o.getColumnDefinitions().size())
                  return false;
  
              for (int j = 0; j < getColumnDefinitions().size(); j++)
              {
                  ByteBuffer b1 = getBytesUnsafe(j);
                  ByteBuffer b2 = o.getBytesUnsafe(j);
  
                  if (b1 != null && b2 != null && !b1.equals(b2))
                  {
                      return false;
                  }
                  if (b1 == null && b2 != null || b2 == null && b1 != null)
                  {
                      return false;
                  }
              }
              return true;
          }
  
          public int hashCode()
          {
              return Objects.hash(row);
          }
  
          public String toString()
          {
              StringBuilder sb = new StringBuilder();
              List<ResultHandler.ComparableDefinition> colDefs = getColumnDefinitions().asList();
              for (int i = 0; i < getColumnDefinitions().size(); i++)
              {
                  ByteBuffer bb = getBytesUnsafe(i);
                  String row = bb != null ? ByteBufferUtil.bytesToHex(bb) : "NULL";
                  sb.append(colDefs.get(i)).append(':').append(row).append(",");
              }
              return sb.toString();
          }
      }
  
      public static class DriverColumnDefinitions implements ResultHandler.ComparableColumnDefinitions
      {
          private final ColumnDefinitions columnDefinitions;
          private final boolean failed;
          private final Throwable failureException;
  
          public DriverColumnDefinitions(ColumnDefinitions columnDefinitions)
          {
              this(columnDefinitions, false, null);
          }
  
          private DriverColumnDefinitions(ColumnDefinitions columnDefinitions, boolean failed, Throwable failureException)
          {
              this.columnDefinitions = columnDefinitions;
              this.failed = failed;
              this.failureException = failureException;
          }
  
          public List<ResultHandler.ComparableDefinition> asList()
          {
              if (wasFailed())
                  return Collections.emptyList();
              return columnDefinitions.asList().stream().map(DriverDefinition::new).collect(Collectors.toList());
          }
  
          public boolean wasFailed()
          {
              return failed;
          }
  
          public Throwable getFailureException()
          {
              return failureException;
          }
  
          public int size()
          {
              return columnDefinitions.size();
          }
  
          public Iterator<ResultHandler.ComparableDefinition> iterator()
          {
              return asList().iterator();
          }
  
          public boolean equals(Object oo)
          {
              if (!(oo instanceof ResultHandler.ComparableColumnDefinitions))
                  return false;
  
              ResultHandler.ComparableColumnDefinitions o = (ResultHandler.ComparableColumnDefinitions)oo;
              if (wasFailed() && o.wasFailed())
                  return true;
  
              if (size() != o.size())
                  return false;
  
              return asList().equals(o.asList());
          }
  
          public int hashCode()
          {
              return Objects.hash(columnDefinitions, failed, failureException);
          }
      }
  
      public static class DriverDefinition implements ResultHandler.ComparableDefinition
      {
          private final ColumnDefinitions.Definition def;
  
          public DriverDefinition(ColumnDefinitions.Definition def)
          {
              this.def = def;
          }
  
          public String getType()
          {
              return def.getType().toString();
          }
  
          public String getName()
          {
              return def.getName();
          }
  
          public boolean equals(Object oo)
          {
              if (!(oo instanceof ResultHandler.ComparableDefinition))
                  return false;
  
              return def.equals(((DriverDefinition)oo).def);
          }
  
          public int hashCode()
          {
              return Objects.hash(def);
          }
  
          public String toString()
          {
              return getName() + ':' + getType();
          }
      }
  
  }
  