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 com.datastax.dse.driver.internal.core.graph.binary;
  
  import java.io.IOException;
  import org.apache.tinkerpop.gremlin.structure.io.Buffer;
  import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryReader;
  import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryWriter;
  
  /**
   * Convenience class for dynamic types implemented as Custom types in GraphBinary. This class will
   * take care of handling {value_length} automatically for implementing classes. {@link
   * #writeDynamicCustomValue(Object, Buffer, GraphBinaryWriter)} and {@link
   * #readDynamicCustomValue(Buffer, GraphBinaryReader)} only need to handle writing the internal
   * components of the custom type.
   *
   * @param <T> the java type the implementing classes will encode and decode.
   */
  public abstract class AbstractDynamicGraphBinaryCustomSerializer<T>
      extends AbstractSimpleGraphBinaryCustomSerializer<T> {
    protected abstract void writeDynamicCustomValue(T value, Buffer buffer, GraphBinaryWriter context)
        throws IOException;
  
    protected abstract T readDynamicCustomValue(Buffer buffer, GraphBinaryReader context)
        throws IOException;
  
    @Override
    protected T readCustomValue(int valueLength, Buffer buffer, GraphBinaryReader context)
        throws IOException {
      int initialIndex = buffer.readerIndex();
  
      // read actual custom value
      T read = readDynamicCustomValue(buffer, context);
  
      // make sure we didn't read more than what was input as {value_length}
      checkValueSize(valueLength, (buffer.readerIndex() - initialIndex));
  
      return read;
    }
  
    @Override
    protected void writeCustomValue(T value, Buffer buffer, GraphBinaryWriter context)
        throws IOException {
      // Store the current writer index
      final int valueLengthIndex = buffer.writerIndex();
  
      // Write a dummy length that will be overwritten at the end of this method
      buffer.writeInt(0);
  
      // Custom type's writer logic
      writeDynamicCustomValue(value, buffer, context);
  
      // value_length = diff written - 4 bytes for the dummy length
      final int valueLength = buffer.writerIndex() - valueLengthIndex - GraphBinaryUtils.sizeOfInt();
  
      // Go back, write the {value_length} and then reset back the writer index
      buffer.markWriterIndex().writerIndex(valueLengthIndex).writeInt(valueLength).resetWriterIndex();
    }
  }
  