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.utils;
  
  import java.lang.invoke.MethodHandle;
  import java.lang.invoke.MethodHandles;
  import java.lang.reflect.Method;
  
  import org.apache.cassandra.cql3.functions.types.CodecRegistry;
  import org.apache.cassandra.cql3.functions.types.DataType;
  import org.apache.cassandra.cql3.functions.types.TypeCodec;
  
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.transport.ProtocolVersion;
  
  /**
   * Utility methods to convert from {@link AbstractType} to {@link DataType} or to {@link TypeCodec}.
   */
  public final class JavaDriverUtils
  {
      private static final CodecRegistry codecRegistry = new CodecRegistry();
  
      private static final MethodHandle methodParseOne;
      static
      {
          try
          {
              Class<?> cls = Class.forName("org.apache.cassandra.cql3.functions.types.DataTypeClassNameParser");
              Method m = cls.getDeclaredMethod("parseOne", String.class, ProtocolVersion.class, CodecRegistry.class);
              m.setAccessible(true);
              methodParseOne = MethodHandles.lookup().unreflect(m);
          }
          catch (Exception e)
          {
              throw new RuntimeException(e);
          }
      }
  
      public static TypeCodec<Object> codecFor(AbstractType<?> abstractType)
      {
          return codecFor(driverType(abstractType));
      }
  
      public static TypeCodec<Object> codecFor(DataType dataType)
      {
          return codecRegistry.codecFor(dataType);
      }
  
      /**
       * Returns the Java Driver {@link DataType} for the C* internal type.
       */
      public static DataType driverType(AbstractType<?> abstractType)
      {
          try
          {
              return (DataType) methodParseOne.invoke(abstractType.toString(), ProtocolVersion.CURRENT, codecRegistry);
          }
          catch (RuntimeException | Error e)
          {
              // immediately rethrow these...
              throw e;
          }
          catch (Throwable e)
          {
              throw new RuntimeException("cannot parse driver type " + abstractType, e);
          }
      }
  
      /**
       * The class should never be instantiated as it contains only static methods.
       */
      private JavaDriverUtils()
      {
      }
  }
  