com.github.cassandra.jdbc.provider.datastax.codecs.StringBlobCodec Maven / Gradle / Ivy

/**
 * Copyright (C) 2015-2017, Zhichun Wu
 *
 * 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.github.cassandra.jdbc.provider.datastax.codecs;

import com.datastax.driver.core.DataType;
import com.datastax.driver.core.ProtocolVersion;
import com.datastax.driver.core.TypeCodec;
import com.datastax.driver.core.exceptions.InvalidTypeException;

import java.nio.ByteBuffer;

public class StringBlobCodec extends TypeCodec {
    public static final StringBlobCodec instance = new StringBlobCodec();

    private StringBlobCodec() {
        super(DataType.blob(), String.class);
    }

    @Override
    public ByteBuffer serialize(String value, ProtocolVersion protocolVersion) throws InvalidTypeException {
        return value == null ? null : ByteBuffer.wrap(value.getBytes());
    }

    @Override
    public String deserialize(ByteBuffer bytes, ProtocolVersion protocolVersion) throws InvalidTypeException {
        if (bytes == null || bytes.remaining() == 0)
            return null;

        return new String(bytes.array());
    }

    @Override
    public String format(String value) {
        return value == null ? "NULL" : value;
    }

    @Override
    public String parse(String value) {
        if (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL"))
            return null;

        return value;
    }

}