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/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  Licensed 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 io.seata.common.util;

import java.sql.Blob;

import javax.sql.rowset.serial.SerialBlob;

import io.seata.common.Constants;
import io.seata.common.exception.ShouldNeverHappenException;

/**
 * The type Blob utils.
 *
 * @author slievrly
 * @author Geng Zhang
 */
public class BlobUtils {

    private BlobUtils() {

    }

    /**
     * String 2 blob blob.
     *
     * @param str the str
     * @return the blob
     */
    public static Blob string2blob(String str) {
        if (str == null) {
            return null;
        }

        try {
            return new SerialBlob(str.getBytes(Constants.DEFAULT_CHARSET));
        } catch (Exception e) {
            throw new ShouldNeverHappenException(e);
        }
    }

    /**
     * Blob 2 string string.
     *
     * @param blob the blob
     * @return the string
     */
    public static String blob2string(Blob blob) {
        if (blob == null) {
            return null;
        }

        try {
            return new String(blob.getBytes((long) 1, (int) blob.length()), Constants.DEFAULT_CHARSET);
        } catch (Exception e) {
            throw new ShouldNeverHappenException(e);
        }
    }

    /**
     * Byte array to blob
     *
     * @param bytes the byte array
     * @return the blob
     */
    public static Blob bytes2Blob(byte[] bytes) {
        if (bytes == null) {
            return null;
        }

        try {
            return new SerialBlob(bytes);
        } catch (Exception e) {
            throw new ShouldNeverHappenException(e);
        }
    }

    /**
     * Blob to byte array.
     *
     * @param blob the blob
     * @return the byte array
     */
    public static byte[] blob2Bytes(Blob blob) {
        if (blob == null) {
            return null;
        }

        try {
            return blob.getBytes((long) 1, (int) blob.length());
        } catch (Exception e) {
            throw new ShouldNeverHappenException(e);
        }
    }
}