com.datastax.oss.driver.internal.core.type.codec.extras.array.ByteListToArrayCodec Maven / Gradle / Ivy
/*
* 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.oss.driver.internal.core.type.codec.extras.array;
import com.datastax.oss.driver.api.core.ProtocolVersion;
import com.datastax.oss.driver.api.core.type.DataTypes;
import com.datastax.oss.driver.api.core.type.reflect.GenericType;
import com.datastax.oss.driver.internal.core.type.codec.SimpleBlobCodec;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.nio.ByteBuffer;
import java.util.Objects;
import net.jcip.annotations.Immutable;
/**
* A codec that maps the CQL type {@code list} to the Java type {@code byte[]}.
*
* Note that this codec is not suitable for reading CQL blobs as byte arrays; you should use
* {@link SimpleBlobCodec} for that.
*
*
Note that this codec is designed for performance and converts CQL lists directly to
* {@code byte[]}, thus avoiding any unnecessary boxing and unboxing of Java primitive {@code byte}
* values; it also instantiates arrays without the need for an intermediary Java {@code List}
* object.
*/
@Immutable
public class ByteListToArrayCodec extends AbstractPrimitiveListToArrayCodec {
public ByteListToArrayCodec() {
super(DataTypes.listOf(DataTypes.SMALLINT), GenericType.of(byte[].class));
}
@Override
public boolean accepts(@NonNull Class javaClass) {
Objects.requireNonNull(javaClass);
return byte[].class.equals(javaClass);
}
@Override
public boolean accepts(@NonNull Object value) {
Objects.requireNonNull(value);
return value instanceof byte[];
}
@Override
protected int sizeOfComponentType() {
return 1;
}
@Override
protected void serializeElement(
@NonNull ByteBuffer output,
@NonNull byte[] array,
int index,
@NonNull ProtocolVersion protocolVersion) {
output.put(array[index]);
}
@Override
protected void deserializeElement(
@NonNull ByteBuffer input,
@NonNull byte[] array,
int index,
@NonNull ProtocolVersion protocolVersion) {
array[index] = input.get();
}
@Override
protected void formatElement(@NonNull StringBuilder output, @NonNull byte[] array, int index) {
output.append(array[index]);
}
@Override
protected void parseElement(@NonNull String input, @NonNull byte[] array, int index) {
array[index] = Byte.parseByte(input);
}
@NonNull
@Override
protected byte[] newInstance(int size) {
return new byte[size];
}
}