Method getFileByteSource

src/main/java/club/qqtim/util/FileUtil.java:123–140

(String path, String type)

    }

    public static ByteSource getFileByteSource(String path, String type) throws IOException {
        char nullChar = 0;
        ByteSource byteSource = Files.asByteSource(new File(path));
        if (ConstantVal.NONE.equals(type)) {
            return byteSource;
        }
        // todo: refactor the below code to extract a method like obj.partition in python
        byte[] fileWithHeader = byteSource.read();
        byte[] header = new byte[type.getBytes(Charsets.UTF_8).length];
        byte[] nullBytes = new byte[Chars.toByteArray(nullChar).length];
        byte[] fileContent = new byte[fileWithHeader.length - header.length - nullBytes.length];
        ByteBuffer fileWithHeaderBuffer = ByteBuffer.wrap(fileWithHeader);
        fileWithHeaderBuffer.get(header, 0, header.length);
        log.debug("current object type is {}:", new String(header, Charsets.UTF_8));
        fileWithHeaderBuffer.get(nullBytes, 0, nullBytes.length);
        fileWithHeaderBuffer.get(fileContent, 0, fileContent.length);
        return ByteSource.wrap(fileContent);
    }