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package com.github.xphsc.util;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

/**
 * Created by ${huipei.x} on 2017-5-25.
 */
public class CharsetUtil {

    public static final String ISO_8859_1 = "ISO-8859-1";
    public static final String UTF_8 = "UTF-8";
    public static final String GBK = "GBK";
    public static final Charset CHARSET_ISO_8859_1;
    public static final Charset CHARSET_UTF_8;
    public static final Charset CHARSET_GBK;

    private CharsetUtil() {
    }

    public static Charset charset(String charsetName) {
        return StringUtil.isBlank(charsetName)?Charset.defaultCharset():Charset.forName(charsetName);
    }

    public static String convert(String source, String srcCharset, String destCharset) {
        return convert(source, Charset.forName(srcCharset), Charset.forName(destCharset));
    }

    public static String convert(String source, Charset srcCharset, Charset destCharset) {
        if(null == srcCharset) {
            srcCharset = StandardCharsets.ISO_8859_1;
        }

        if(null == destCharset) {
            destCharset = StandardCharsets.UTF_8;
        }

        return !StringUtil.isBlank(source) && !srcCharset.equals(destCharset)?new String(source.getBytes(srcCharset), destCharset):source;
    }

    public static String systemCharset() {
        return defaultCharsetName();
    }

    public static String defaultCharsetName() {
        return Charset.defaultCharset().name();
    }

    public static Charset defaultCharset() {
        return Charset.defaultCharset();
    }

    static {
        CHARSET_ISO_8859_1 = StandardCharsets.ISO_8859_1;
        CHARSET_UTF_8 = StandardCharsets.UTF_8;
        CHARSET_GBK = Charset.forName("GBK");
    }
}