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A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.
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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.core;

import com.datastax.driver.core.exceptions.InvalidTypeException;
import com.google.common.reflect.TypeToken;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.InetAddress;
import java.nio.ByteBuffer;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;

abstract class AbstractGettableByIndexData implements GettableByIndexData {

  protected final ProtocolVersion protocolVersion;

  protected AbstractGettableByIndexData(ProtocolVersion protocolVersion) {
    this.protocolVersion = protocolVersion;
  }

  /**
   * Returns the type for the value at index {@code i}.
   *
   * @param i the index of the type to fetch.
   * @return the type of the value at index {@code i}.
   * @throws IndexOutOfBoundsException if {@code i} is not a valid index.
   */
  protected abstract DataType getType(int i);

  /**
   * Returns the name corresponding to the value at index {@code i}.
   *
   * @param i the index of the name to fetch.
   * @return the name corresponding to the value at index {@code i}.
   * @throws IndexOutOfBoundsException if {@code i} is not a valid index.
   */
  protected abstract String getName(int i);

  /**
   * Returns the value at index {@code i}.
   *
   * @param i the index to fetch.
   * @return the value at index {@code i}.
   * @throws IndexOutOfBoundsException if {@code i} is not a valid index.
   */
  protected abstract ByteBuffer getValue(int i);

  protected abstract CodecRegistry getCodecRegistry();

  protected  TypeCodec codecFor(int i) {
    return getCodecRegistry().codecFor(getType(i));
  }

  protected  TypeCodec codecFor(int i, Class javaClass) {
    return getCodecRegistry().codecFor(getType(i), javaClass);
  }

  protected  TypeCodec codecFor(int i, TypeToken javaType) {
    return getCodecRegistry().codecFor(getType(i), javaType);
  }

  protected  TypeCodec codecFor(int i, T value) {
    return getCodecRegistry().codecFor(getType(i), value);
  }

  protected void checkType(int i, DataType.Name actual) {
    DataType.Name expected = getType(i).getName();
    if (!actual.isCompatibleWith(expected))
      throw new InvalidTypeException(
          String.format("Value %s is of type %s, not %s", getName(i), expected, actual));
  }

  /** {@inheritDoc} */
  @Override
  public boolean isNull(int i) {
    return getValue(i) == null;
  }

  /** {@inheritDoc} */
  @Override
  public boolean getBool(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Boolean.class);
    if (codec instanceof TypeCodec.PrimitiveBooleanCodec)
      return ((TypeCodec.PrimitiveBooleanCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public byte getByte(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Byte.class);
    if (codec instanceof TypeCodec.PrimitiveByteCodec)
      return ((TypeCodec.PrimitiveByteCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public short getShort(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Short.class);
    if (codec instanceof TypeCodec.PrimitiveShortCodec)
      return ((TypeCodec.PrimitiveShortCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public int getInt(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Integer.class);
    if (codec instanceof TypeCodec.PrimitiveIntCodec)
      return ((TypeCodec.PrimitiveIntCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public long getLong(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Long.class);
    if (codec instanceof TypeCodec.PrimitiveLongCodec)
      return ((TypeCodec.PrimitiveLongCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public Date getTimestamp(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, Date.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public LocalDate getDate(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, LocalDate.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public long getTime(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Long.class);
    if (codec instanceof TypeCodec.PrimitiveLongCodec)
      return ((TypeCodec.PrimitiveLongCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public float getFloat(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Float.class);
    if (codec instanceof TypeCodec.PrimitiveFloatCodec)
      return ((TypeCodec.PrimitiveFloatCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public double getDouble(int i) {
    ByteBuffer value = getValue(i);
    TypeCodec codec = codecFor(i, Double.class);
    if (codec instanceof TypeCodec.PrimitiveDoubleCodec)
      return ((TypeCodec.PrimitiveDoubleCodec) codec).deserializeNoBoxing(value, protocolVersion);
    else return codec.deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public ByteBuffer getBytesUnsafe(int i) {
    ByteBuffer value = getValue(i);
    if (value == null) return null;
    return value.duplicate();
  }

  /** {@inheritDoc} */
  @Override
  public ByteBuffer getBytes(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, ByteBuffer.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public String getString(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, String.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public BigInteger getVarint(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, BigInteger.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public BigDecimal getDecimal(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, BigDecimal.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public UUID getUUID(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, UUID.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public InetAddress getInet(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, InetAddress.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public  List getList(int i, Class elementsClass) {
    return getList(i, TypeToken.of(elementsClass));
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public  List getList(int i, TypeToken elementsType) {
    ByteBuffer value = getValue(i);
    TypeToken> javaType = TypeTokens.listOf(elementsType);
    return codecFor(i, javaType).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public  Set getSet(int i, Class elementsClass) {
    return getSet(i, TypeToken.of(elementsClass));
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public  Set getSet(int i, TypeToken elementsType) {
    ByteBuffer value = getValue(i);
    TypeToken> javaType = TypeTokens.setOf(elementsType);
    return codecFor(i, javaType).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public  Map getMap(int i, Class keysClass, Class valuesClass) {
    return getMap(i, TypeToken.of(keysClass), TypeToken.of(valuesClass));
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public  Map getMap(int i, TypeToken keysType, TypeToken valuesType) {
    ByteBuffer value = getValue(i);
    TypeToken> javaType = TypeTokens.mapOf(keysType, valuesType);
    return codecFor(i, javaType).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public UDTValue getUDTValue(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, UDTValue.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public TupleValue getTupleValue(int i) {
    ByteBuffer value = getValue(i);
    return codecFor(i, TupleValue.class).deserialize(value, protocolVersion);
  }

  /** {@inheritDoc} */
  @Override
  public Object getObject(int i) {
    return get(i, codecFor(i));
  }

  @Override
  public  T get(int i, Class targetClass) {
    return get(i, codecFor(i, targetClass));
  }

  @Override
  public  T get(int i, TypeToken targetType) {
    return get(i, codecFor(i, targetType));
  }

  @Override
  public  T get(int i, TypeCodec codec) {
    checkType(i, codec.getCqlType().getName());
    ByteBuffer value = getValue(i);
    return codec.deserialize(value, protocolVersion);
  }
}