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.io.sstable;
  
  import java.io.Closeable;
  import java.io.File;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import java.util.SortedSet;
  import java.util.UUID;
  import java.util.concurrent.TimeUnit;
  import java.util.stream.Collectors;
  
  import org.apache.commons.lang3.ArrayUtils;
  
  import org.antlr.runtime.RecognitionException;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLFragmentParser;
  import org.apache.cassandra.cql3.ColumnSpecification;
  import org.apache.cassandra.cql3.CqlParser;
  import org.apache.cassandra.cql3.CQLStatement;
  import org.apache.cassandra.cql3.QueryOptions;
  import org.apache.cassandra.cql3.UpdateParameters;
  import org.apache.cassandra.cql3.functions.types.TypeCodec;
  import org.apache.cassandra.cql3.statements.UpdateStatement;
  import org.apache.cassandra.cql3.statements.schema.CreateTableStatement;
  import org.apache.cassandra.cql3.statements.schema.CreateTypeStatement;
  import org.apache.cassandra.db.Clustering;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.Directories;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.dht.IPartitioner;
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.exceptions.InvalidRequestException;
  import org.apache.cassandra.exceptions.RequestValidationException;
  import org.apache.cassandra.exceptions.SyntaxException;
  import org.apache.cassandra.io.sstable.format.SSTableFormat;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.Schema;
  import org.apache.cassandra.schema.SchemaTransformations;
  import org.apache.cassandra.schema.TableId;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.schema.Tables;
  import org.apache.cassandra.schema.Types;
  import org.apache.cassandra.service.ClientState;
  import org.apache.cassandra.transport.ProtocolVersion;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.JavaDriverUtils;
  
  import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  
  /**
   * Utility to write SSTables.
   * <p>
   * Typical usage looks like:
   * <pre>
   *   String type = CREATE TYPE myKs.myType (a int, b int)";
   *   String schema = "CREATE TABLE myKs.myTable ("
   *                 + "  k int PRIMARY KEY,"
   *                 + "  v1 text,"
   *                 + "  v2 int,"
   *                 + "  v3 myType,"
   *                 + ")";
   *   String insert = "INSERT INTO myKs.myTable (k, v1, v2, v3) VALUES (?, ?, ?, ?)";
   *
   *   // Creates a new writer. You need to provide at least the directory where to write the created sstable,
   *   // the schema for the sstable to write and a (prepared) insert statement to use. If you do not use the
   *   // default partitioner (Murmur3Partitioner), you will also need to provide the partitioner in use, see
   *   // StressCQLSSTableWriter.Builder for more details on the available options.
   *   StressCQLSSTableWriter writer = StressCQLSSTableWriter.builder()
   *                                             .inDirectory("path/to/directory")
   *                                             .withType(type)
   *                                             .forTable(schema)
   *                                             .using(insert).build();
   *
   *   UserType myType = writer.getUDType("myType");
   *   // Adds a nember of rows to the resulting sstable
   *   writer.addRow(0, "test1", 24, myType.newValue().setInt("a", 10).setInt("b", 20));
   *   writer.addRow(1, "test2", null, null);
   *   writer.addRow(2, "test3", 42, myType.newValue().setInt("a", 30).setInt("b", 40));
   *
   *   // Close the writer, finalizing the sstable
   *   writer.close();
   * </pre>
   *
   * Please note that {@code StressCQLSSTableWriter} is <b>not</b> thread-safe (multiple threads cannot access the
   * same instance). It is however safe to use multiple instances in parallel (even if those instance write
   * sstables for the same table).
   */
  public class StressCQLSSTableWriter implements Closeable
  {
      public static final ByteBuffer UNSET_VALUE = ByteBufferUtil.UNSET_BYTE_BUFFER;
  
      static
      {
          DatabaseDescriptor.clientInitialization(false);
          // Partitioner is not set in client mode.
          if (DatabaseDescriptor.getPartitioner() == null)
              DatabaseDescriptor.setPartitionerUnsafe(Murmur3Partitioner.instance);
      }
  
      private final AbstractSSTableSimpleWriter writer;
      private final UpdateStatement insert;
      private final List<ColumnSpecification> boundNames;
      private final List<TypeCodec> typeCodecs;
      private final ColumnFamilyStore cfs;
  
      private StressCQLSSTableWriter(ColumnFamilyStore cfs, AbstractSSTableSimpleWriter writer, UpdateStatement insert, List<ColumnSpecification> boundNames)
      {
          this.cfs = cfs;
          this.writer = writer;
          this.insert = insert;
          this.boundNames = boundNames;
          this.typeCodecs = boundNames.stream().map(bn ->  JavaDriverUtils.codecFor(JavaDriverUtils.driverType(bn.type)))
                                               .collect(Collectors.toList());
      }
  
      /**
       * Returns a new builder for a StressCQLSSTableWriter.
       *
       * @return the new builder.
       */
      public static Builder builder()
      {
          return new Builder();
      }
  
      /**
       * Adds a new row to the writer.
       * <p>
       * This is a shortcut for {@code addRow(Arrays.asList(values))}.
       *
       * @param values the row values (corresponding to the bind variables of the
       * insertion statement used when creating by this writer).
       * @return this writer.
       */
      public StressCQLSSTableWriter addRow(Object... values)
      throws InvalidRequestException, IOException
      {
          return addRow(Arrays.asList(values));
      }
  
      /**
       * Adds a new row to the writer.
       * <p>
       * Each provided value type should correspond to the types of the CQL column
       * the value is for. The correspondance between java type and CQL type is the
       * same one than the one documented at
       * www.datastax.com/drivers/java/2.0/apidocs/com/datastax/driver/core/DataType.Name.html#asJavaClass().
       * <p>
       * If you prefer providing the values directly as binary, use
       * {@link #rawAddRow} instead.
       *
       * @param values the row values (corresponding to the bind variables of the
       * insertion statement used when creating by this writer).
       * @return this writer.
       */
      public StressCQLSSTableWriter addRow(List<Object> values)
      throws InvalidRequestException, IOException
      {
          int size = Math.min(values.size(), boundNames.size());
          List<ByteBuffer> rawValues = new ArrayList<>(size);
  
          for (int i = 0; i < size; i++)
          {
              Object value = values.get(i);
              rawValues.add(serialize(value, typeCodecs.get(i)));
          }
  
          return rawAddRow(rawValues);
      }
  
      /**
       * Adds a new row to the writer.
       * <p>
       * This is equivalent to the other addRow methods, but takes a map whose
       * keys are the names of the columns to add instead of taking a list of the
       * values in the order of the insert statement used during construction of
       * this write.
       * <p>
       * Please note that the column names in the map keys must be in lowercase unless
       * the declared column name is a
       * <a href="http://cassandra.apache.org/doc/cql3/CQL.html#identifiers">case-sensitive quoted identifier</a>
       * (in which case the map key must use the exact case of the column).
       *
       * @param values a map of colum name to column values representing the new
       * row to add. Note that if a column is not part of the map, it's value will
       * be {@code null}. If the map contains keys that does not correspond to one
       * of the column of the insert statement used when creating this writer, the
       * the corresponding value is ignored.
       * @return this writer.
       */
      public StressCQLSSTableWriter addRow(Map<String, Object> values)
      throws InvalidRequestException, IOException
      {
          int size = boundNames.size();
          List<ByteBuffer> rawValues = new ArrayList<>(size);
          for (int i = 0; i < size; i++)
          {
              ColumnSpecification spec = boundNames.get(i);
              Object value = values.get(spec.name.toString());
              rawValues.add(serialize(value, typeCodecs.get(i)));
          }
          return rawAddRow(rawValues);
      }
  
      /**
       * Adds a new row to the writer given already serialized values.
       *
       * @param values the row values (corresponding to the bind variables of the
       * insertion statement used when creating by this writer) as binary.
       * @return this writer.
       */
      public StressCQLSSTableWriter rawAddRow(ByteBuffer... values)
      throws InvalidRequestException, IOException
      {
          return rawAddRow(Arrays.asList(values));
      }
  
      /**
       * Adds a new row to the writer given already serialized values.
       * <p>
       * This is a shortcut for {@code rawAddRow(Arrays.asList(values))}.
       *
       * @param values the row values (corresponding to the bind variables of the
       * insertion statement used when creating by this writer) as binary.
       * @return this writer.
       */
      public StressCQLSSTableWriter rawAddRow(List<ByteBuffer> values)
      throws InvalidRequestException, IOException
      {
          if (values.size() != boundNames.size())
              throw new InvalidRequestException(String.format("Invalid number of arguments, expecting %d values but got %d", boundNames.size(), values.size()));
  
          QueryOptions options = QueryOptions.forInternalCalls(null, values);
          ClientState state = ClientState.forInternalCalls();
          List<ByteBuffer> keys = insert.buildPartitionKeyNames(options, state);
          SortedSet<Clustering<?>> clusterings = insert.createClustering(options, state);
  
          long now = currentTimeMillis();
          // Note that we asks indexes to not validate values (the last 'false' arg below) because that triggers a 'Keyspace.open'
          // and that forces a lot of initialization that we don't want.
          UpdateParameters params = new UpdateParameters(insert.metadata(),
                                                         ClientState.forInternalCalls(),
                                                         options,
                                                         insert.getTimestamp(TimeUnit.MILLISECONDS.toMicros(now), options),
                                                         (int) TimeUnit.MILLISECONDS.toSeconds(now),
                                                         insert.getTimeToLive(options),
                                                         Collections.emptyMap());
  
          try
          {
              for (ByteBuffer key : keys)
              {
                  for (Clustering<?> clustering : clusterings)
                      insert.addUpdateForKey(writer.getUpdateFor(key), clustering, params);
              }
              return this;
          }
          catch (SSTableSimpleUnsortedWriter.SyncException e)
          {
              // If we use a BufferedWriter and had a problem writing to disk, the IOException has been
              // wrapped in a SyncException (see BufferedWriter below). We want to extract that IOE.
              throw (IOException)e.getCause();
          }
      }
  
      /**
       * Adds a new row to the writer given already serialized values.
       * <p>
       * This is equivalent to the other rawAddRow methods, but takes a map whose
       * keys are the names of the columns to add instead of taking a list of the
       * values in the order of the insert statement used during construction of
       * this write.
       *
       * @param values a map of colum name to column values representing the new
       * row to add. Note that if a column is not part of the map, it's value will
       * be {@code null}. If the map contains keys that does not correspond to one
       * of the column of the insert statement used when creating this writer, the
       * the corresponding value is ignored.
       * @return this writer.
       */
      public StressCQLSSTableWriter rawAddRow(Map<String, ByteBuffer> values)
      throws InvalidRequestException, IOException
      {
          int size = Math.min(values.size(), boundNames.size());
          List<ByteBuffer> rawValues = new ArrayList<>(size);
          for (int i = 0; i < size; i++) 
          {
              ColumnSpecification spec = boundNames.get(i);
              rawValues.add(values.get(spec.name.toString()));
          }
          return rawAddRow(rawValues);
      }
  
      /**
       * Close this writer.
       * <p>
       * This method should be called, otherwise the produced sstables are not
       * guaranteed to be complete (and won't be in practice).
       */
      public void close() throws IOException
      {
          writer.close();
      }
  
      private ByteBuffer serialize(Object value, TypeCodec codec)
      {
          if (value == null || value == UNSET_VALUE)
              return (ByteBuffer) value;
  
          return codec.serialize(value, ProtocolVersion.CURRENT);
      }
      /**
       * The writer loads data in directories corresponding to how they laid out on the server.
       * <p>
       * {keyspace}/{table-cfid}/
       *
       * This method can be used to fetch the innermost directory with the sstable components
       * @return The directory containing the sstable components
       */
      public File getInnermostDirectory()
      {
          return cfs.getDirectories().getDirectoryForNewSSTables().toJavaIOFile();
      }
  
      /**
       * A Builder for a StressCQLSSTableWriter object.
       */
      public static class Builder
      {
          private final List<File> directoryList;
          private ColumnFamilyStore cfs;
  
          protected SSTableFormat<?, ?> format = null;
  
          private Boolean makeRangeAware = false;
  
          private CreateTableStatement.Raw schemaStatement;
          private final List<CreateTypeStatement.Raw> typeStatements;
          private UpdateStatement.ParsedInsert insertStatement;
          private IPartitioner partitioner;
  
          private boolean sorted = false;
          private long bufferSizeInMiB = 128;
  
          protected Builder()
          {
              this.typeStatements = new ArrayList<>();
              this.directoryList = new ArrayList<>();
          }
  
          /**
           * The directory where to write the sstables.
           * <p>
           * This is a mandatory option.
           *
           * @param directory the directory to use, which should exists and be writable.
           * @return this builder.
           *
           * @throws IllegalArgumentException if {@code directory} doesn't exist or is not writable.
           */
          public Builder inDirectory(String directory)
          {
              return inDirectory(new File(directory));
          }
  
          /**
           * The directory where to write the sstables (mandatory option).
           * <p>
           * This is a mandatory option.
           *
           * @param directory the directory to use, which should exist and be writable.
           * @return this builder.
           *
           * @throws IllegalArgumentException if {@code directory} doesn't exist or is not writable.
           */
          public Builder inDirectory(File directory)
          {
              if (!directory.exists())
                  throw new IllegalArgumentException(directory + " doesn't exists");
              if (!directory.canWrite())
                  throw new IllegalArgumentException(directory + " exists but is not writable");
  
              directoryList.add(directory);
              return this;
          }
  
          /**
           * A pre-instanciated ColumnFamilyStore
           * <p>
           * This is can be used in place of inDirectory and forTable
           *
           * @see #inDirectory(File)
           *
           * @param cfs the list of directories to use, which should exist and be writable.
           * @return this builder.
           *
           * @throws IllegalArgumentException if a directory doesn't exist or is not writable.
           */
          public Builder withCfs(ColumnFamilyStore cfs)
          {
              this.cfs = cfs;
              return this;
          }
  
  
          public Builder withType(String typeDefinition) throws SyntaxException
          {
              typeStatements.add(parseStatement(typeDefinition, CreateTypeStatement.Raw.class, "CREATE TYPE"));
              return this;
          }
  
          /**
           * The schema (CREATE TABLE statement) for the table for which sstable are to be created.
           * <p>
           * Please note that the provided CREATE TABLE statement <b>must</b> use a fully-qualified
           * table name, one that include the keyspace name.
           * <p>
           * This is a mandatory option.
           *
           * @param schema the schema of the table for which sstables are to be created.
           * @return this builder.
           *
           * @throws IllegalArgumentException if {@code schema} is not a valid CREATE TABLE statement
           * or does not have a fully-qualified table name.
           */
          public Builder forTable(String schema)
          {
              this.schemaStatement = parseStatement(schema, CreateTableStatement.Raw.class, "CREATE TABLE");
              return this;
          }
  
          /**
           * The partitioner to use.
           * <p>
           * By default, {@code Murmur3Partitioner} will be used. If this is not the partitioner used
           * by the cluster for which the SSTables are created, you need to use this method to
           * provide the correct partitioner.
           *
           * @param partitioner the partitioner to use.
           * @return this builder.
           */
          public Builder withPartitioner(IPartitioner partitioner)
          {
              this.partitioner = partitioner;
              return this;
          }
  
  
          /**
           * Specify if the sstable writer should be vnode range aware.
           * This will create a sstable per vnode range.
           *
           * @param makeRangeAware
           * @return
           */
          public Builder rangeAware(boolean makeRangeAware)
          {
              this.makeRangeAware = makeRangeAware;
              return this;
          }
  
          /**
           * The INSERT statement defining the order of the values to add for a given CQL row.
           * <p>
           * Please note that the provided INSERT statement <b>must</b> use a fully-qualified
           * table name, one that include the keyspace name. Morewover, said statement must use
           * bind variables since it is those bind variables that will be bound to values by the
           * resulting writer.
           * <p>
           * This is a mandatory option, and this needs to be called after foTable().
           *
           * @param insert an insertion statement that defines the order
           * of column values to use.
           * @return this builder.
           *
           * @throws IllegalArgumentException if {@code insertStatement} is not a valid insertion
           * statement, does not have a fully-qualified table name or have no bind variables.
           */
          public Builder using(String insert)
          {
              this.insertStatement = parseStatement(insert, UpdateStatement.ParsedInsert.class, "INSERT");
              return this;
          }
  
          /**
           * The size of the buffer to use.
           * <p>
           * This defines how much data will be buffered before being written as
           * a new SSTable. This corresponds roughly to the data size that will have the created
           * sstable.
           * <p>
           * The default is 128MiB, which should be reasonable for a 1GiB heap. If you experience
           * OOM while using the writer, you should lower this value.
           *
           * @param size the size to use in MiB.
           * @return this builder.
           */
          public Builder withBufferSizeInMiB(int size)
          {
              this.bufferSizeInMiB = size;
              return this;
          }
  
          /**
           * This method is deprecated in favor of the new withBufferSizeInMiB(int size)
           * The size of the buffer to use.
           * <p>
           * This defines how much data will be buffered before being written as
           * a new SSTable. This corresponds roughly to the data size that will have the created
           * sstable.
           * <p>
           * The default is 128MiB, which should be reasonable for a 1GiB heap. If you experience
           * OOM while using the writer, you should lower this value.
           *
           * @param size the size to use in MiB.
           * @return this builder.
           */
          public Builder withBufferSizeInMB(int size)
          {
              return withBufferSizeInMiB(size);
          }
  
          /**
           * Creates a StressCQLSSTableWriter that expects sorted inputs.
           * <p>
           * If this option is used, the resulting writer will expect rows to be
           * added in SSTable sorted order (and an exception will be thrown if that
           * is not the case during insertion). The SSTable sorted order means that
           * rows are added such that their partition key respect the partitioner
           * order.
           * <p>
           * You should thus only use this option is you know that you can provide
           * the rows in order, which is rarely the case. If you can provide the
           * rows in order however, using this sorted might be more efficient.
           * <p>
           * Note that if used, some option like withBufferSizeInMiB will be ignored.
           *
           * @return this builder.
           */
          public Builder sorted()
          {
              this.sorted = true;
              return this;
          }
  
          public StressCQLSSTableWriter build()
          {
              if (directoryList.isEmpty() && cfs == null)
                  throw new IllegalStateException("No output directories specified, you should provide a directory with inDirectory()");
              if (schemaStatement == null && cfs == null)
                  throw new IllegalStateException("Missing schema, you should provide the schema for the SSTable to create with forTable()");
              if (insertStatement == null)
                  throw new IllegalStateException("No insert statement specified, you should provide an insert statement through using()");
  
              synchronized (StressCQLSSTableWriter.class)
              {
                  if (cfs == null)
                      cfs = createOfflineTable(schemaStatement, typeStatements, directoryList);
  
                  if (partitioner == null)
                      partitioner = cfs.getPartitioner();
  
                  UpdateStatement preparedInsert = prepareInsert();
                  AbstractSSTableSimpleWriter writer = sorted
                                                       ? new SSTableSimpleWriter(cfs.getDirectories().getDirectoryForNewSSTables(), cfs.metadata, preparedInsert.updatedColumns(), -1)
                                                       : new SSTableSimpleUnsortedWriter(cfs.getDirectories().getDirectoryForNewSSTables(), cfs.metadata, preparedInsert.updatedColumns(), bufferSizeInMiB);
  
                  if (format != null)
                      writer.setSSTableFormatType(format);
  
                  writer.setRangeAwareWriting(makeRangeAware);
  
                  return new StressCQLSSTableWriter(cfs, writer, preparedInsert, preparedInsert.getBindVariables());
              }
          }
  
          private static Types createTypes(String keyspace, List<CreateTypeStatement.Raw> typeStatements)
          {
              KeyspaceMetadata ksm = Schema.instance.getKeyspaceMetadata(keyspace);
              Types.RawBuilder builder = Types.rawBuilder(keyspace);
              for (CreateTypeStatement.Raw st : typeStatements)
                  st.addToRawBuilder(builder);
  
              return builder.build();
          }
  
          public static ColumnFamilyStore createOfflineTable(String schema, List<File> directoryList)
          {
              return createOfflineTable(parseStatement(schema, CreateTableStatement.Raw.class, "CREATE TABLE"), Collections.EMPTY_LIST, directoryList);
          }
  
          /**
           * Creates the table according to schema statement
           * with specified data directories
           */
          public static ColumnFamilyStore createOfflineTable(CreateTableStatement.Raw schemaStatement, List<CreateTypeStatement.Raw> typeStatements, List<File> directoryList)
          {
              String keyspace = schemaStatement.keyspace();
  
              KeyspaceMetadata ksm = KeyspaceMetadata.create(keyspace, KeyspaceParams.simple(1));
              Schema.instance.submit((metadata) ->  metadata.schema.getKeyspaces().withAddedOrUpdated(ksm));
  
              Types types = createTypes(keyspace, typeStatements);
              Schema.instance.submit(SchemaTransformations.addTypes(types, true));
  
              TableMetadata tableMetadata = ksm.tables.getNullable(schemaStatement.table());
              if (tableMetadata != null)
                  return Schema.instance.getColumnFamilyStoreInstance(tableMetadata.id);
  
              ClientState state = ClientState.forInternalCalls();
              CreateTableStatement statement = schemaStatement.prepare(state);
              statement.validate(state);
  
              //Build metadata with a portable tableId
              tableMetadata = statement.builder(ksm.types, ksm.userFunctions)
                                       .id(deterministicId(schemaStatement.keyspace(), schemaStatement.table()))
                                       .build();
              Tables tables = Tables.of(tableMetadata);
              KeyspaceMetadata updated = ksm.withSwapped(tables);
              Schema.instance.submit((metadata) ->  metadata.schema.getKeyspaces().withAddedOrUpdated(updated));
              Keyspace.setInitialized();
              Directories directories = new Directories(tableMetadata, directoryList.stream().map(f -> new Directories.DataDirectory(new org.apache.cassandra.io.util.File(f.toPath()))).collect(Collectors.toList()));
  
              Keyspace ks = Keyspace.openWithoutSSTables(keyspace);
              return ColumnFamilyStore.createColumnFamilyStore(ks, tableMetadata.name, tableMetadata, directories, false, false);
          }
  
          private static TableId deterministicId(String keyspace, String table)
          {
              return TableId.fromUUID(UUID.nameUUIDFromBytes(ArrayUtils.addAll(keyspace.getBytes(), table.getBytes())));
          }
  
          /**
           * Prepares insert statement for writing data to SSTable
           *
           * @return prepared Insert statement and it's bound names
           */
          private UpdateStatement prepareInsert()
          {
              ClientState state = ClientState.forInternalCalls();
              CQLStatement cqlStatement = insertStatement.prepare(state);
              UpdateStatement insert = (UpdateStatement) cqlStatement;
              insert.validate(state);
  
              if (insert.hasConditions())
                  throw new IllegalArgumentException("Conditional statements are not supported");
              if (insert.isCounter())
                  throw new IllegalArgumentException("Counter update statements are not supported");
              if (insert.getBindVariables().isEmpty())
                  throw new IllegalArgumentException("Provided insert statement has no bind variables");
  
              return insert;
          }
      }
  
      public static <T extends CQLStatement.Raw> T parseStatement(String query, Class<T> klass, String type)
      {
          try
          {
              CQLStatement.Raw stmt = CQLFragmentParser.parseAnyUnhandled(CqlParser::query, query);
  
              if (!stmt.getClass().equals(klass))
                  throw new IllegalArgumentException("Invalid query, must be a " + type + " statement but was: " + stmt.getClass());
  
              return klass.cast(stmt);
          }
          catch (RecognitionException | RequestValidationException e)
          {
              throw new IllegalArgumentException(e.getMessage(), e);
          }
      }
  }
  