package com.temp.shared.utils;

public enum HtmlEntity {
    AMP('&', "&"), //
    LT('<', "&lt;"), //
    GT('>', "&gt;"), //
    QUOT('"', "&quot;");

    private char character;
    private String string;

    private HtmlEntity(char character, String string) {
        this.character = character;
        this.string = string;
    }

    public char getCharacter() {
        return character;
    }

    public String getString() {
        return string;
    }

    public boolean wouldMatch(String entity) {
        return string.equalsIgnoreCase(entity);
    }

    public static void append(char c, StringBuilder sb) {
        switch (c) {
            case '&':
                sb.append(AMP.getString());
                break;
            case '<':
                sb.append(LT.getString());
                break;
            case '>':
                sb.append(GT.getString());
                break;
            case '"':
                sb.append(QUOT.getString());
                break;
            default:
                if ((c == '\n') || ((' ' <= c) && (c <= 126))) {
                    sb.append(c);
                } else {
                    sb.append(toDecimalForm(c));
                }
                break;
        }
    }

    public static char fromStringForm(String entity) {
        if (AMP.wouldMatch(entity))
            return AMP.getCharacter();
        if (LT.wouldMatch(entity))
            return LT.getCharacter();
        if (GT.wouldMatch(entity))
            return GT.getCharacter();
        if (QUOT.wouldMatch(entity))
            return QUOT.getCharacter();
        return fromDecimalForm(entity);
    }

    public static String toDecimalForm(char c) {
        return "&#" + ((int) c) + ';';
    }

    public static char fromDecimalForm(String decimalForm) {
        if ((decimalForm != null) && (decimalForm.length() > 3) && decimalForm.startsWith("&#") && decimalForm.endsWith(";")) {
            try {
                int value = Integer.parseInt(decimalForm.substring(2, decimalForm.length() - 1));
                if ((Character.MIN_VALUE <= value) && (value <= Character.MAX_VALUE)) {
                    return (char) value;
                }
            } catch (NumberFormatException whatever) {
                // Fall Thru
            }
        }
        throw new IllegalArgumentException("Not a Html Decimal Entity: '" + decimalForm + "'");
    }

    public static final String NBSP = "&nbsp;";
}