strings.java

这个是网络上下载的一个struct框架的程序

            return defaultValue;
        }
        catch(NumberFormatException numberformatexception)
        {
            return defaultValue;
        }
    }

    public static long asLong(String str)
    {
        return asLong(str, 0L);
    }

    public static Long asLong(String str, Long defaultValue)
    {
        try
        {
            return Long.decode(str.trim());
        }
        catch(NullPointerException nullpointerexception)
        {
            return defaultValue;
        }
        catch(NumberFormatException numberformatexception)
        {
            return defaultValue;
        }
    }

    public static long asLong(String str, long defaultValue)
    {
        try
        {
            return Long.decode(str.trim()).longValue();
        }
        catch(NullPointerException nullpointerexception)
        {
            return defaultValue;
        }
        catch(NumberFormatException numberformatexception)
        {
            return defaultValue;
        }
    }

    public static short asShort(String str)
    {
        return asShort(str, (short)0);
    }

    public static Short asShort(String str, Short defaultValue)
    {
        try
        {
            return Short.decode(str.trim());
        }
        catch(NullPointerException nullpointerexception)
        {
            return defaultValue;
        }
        catch(NumberFormatException numberformatexception)
        {
            return defaultValue;
        }
    }

    public static short asShort(String str, short defaultValue)
    {
        try
        {
            return Short.decode(str.trim()).shortValue();
        }
        catch(NullPointerException nullpointerexception)
        {
            return defaultValue;
        }
        catch(NumberFormatException numberformatexception)
        {
            return defaultValue;
        }
    }

    public static String asString(String str)
    {
        return asString(str, "", "");
    }

    public static String asString(String str, String defaultValue)
    {
        return asString(str, defaultValue, defaultValue);
    }

    public static String asString(String str, String defaultValue, String emptyStringValue)
    {
        try
        {
            return str.equals("") ? emptyStringValue : str;
        }
        catch(NullPointerException nullpointerexception)
        {
            return defaultValue;
        }
    }

    public static Date asDate(String str)
    {
        return asDate(str, new Date(), null);
    }

    public static Date asDate(String str, Date defaultValue)
    {
        return asDate(str, defaultValue, null);
    }

    public static Date asDate(String str, Date defaultValue, String pattern)
    {
        DateFormat formatter = new SimpleDateFormat(pattern != null ? pattern : DEFAULT_DATE_PATTTERN);
        try
        {
            return formatter.parse(str);
        }
        catch(ParseException parseexception)
        {
            return defaultValue;
        }
        catch(NullPointerException nullpointerexception)
        {
            return defaultValue;
        }
    }

    public static Object asType(Class type, String str)
    {
        if(type.isAssignableFrom(java.lang.String.class))
            return asString(str, "", "");
        if(type.isAssignableFrom(java.lang.Integer.class) || type.equals(Integer.TYPE))
            return asInteger(str, new Integer(0));
        if(type.isAssignableFrom(java.lang.Double.class) || type.equals(Double.TYPE))
            return asDouble(str, new Double(0.0D));
        if(type.isAssignableFrom(java.lang.Boolean.class) || type.equals(Boolean.TYPE))
            return asBoolean(str, Boolean.FALSE);
        if(type.isAssignableFrom(java.lang.Float.class) || type.equals(Float.TYPE))
            return asFloat(str, new Float(0.0F));
        if(type.isAssignableFrom(java.lang.Long.class) || type.equals(Long.TYPE))
            return asLong(str, new Long(0L));
        if(type.isAssignableFrom(java.lang.Short.class) || type.equals(Short.TYPE))
            return asShort(str, new Short((short)0));
        if(type.isAssignableFrom(java.lang.Byte.class) || type.equals(Byte.TYPE))
            return asByte(str, new Byte((byte)0));
        if(type.isAssignableFrom(java.lang.Character.class) || type.equals(Character.TYPE))
            return asCharacter(str, new Character('\0'));
        if(type.isAssignableFrom(java.math.BigDecimal.class))
            return asBigDecimal(str, new BigDecimal(BigInteger.ZERO));
        if(type.isAssignableFrom(java.math.BigInteger.class))
            return asBigInteger(str, BigInteger.ZERO);
        if(type.isAssignableFrom(java.util.Date.class))
            return asDate(str, new Date(), null);
        else
            return null;
    }

    public static Object asType(Class type, String str, Object defaultValue)
    {
        if(type.isAssignableFrom(java.lang.String.class))
            return asString(str, (String)defaultValue);
        if(type.isAssignableFrom(java.lang.Integer.class) || type.equals(Integer.TYPE))
            return asInteger(str, (Integer)defaultValue);
        if(type.isAssignableFrom(java.lang.Double.class) || type.equals(Double.TYPE))
            return asDouble(str, (Double)defaultValue);
        if(type.isAssignableFrom(java.lang.Boolean.class) || type.equals(Boolean.TYPE))
            return asBoolean(str, (Boolean)defaultValue);
        if(type.isAssignableFrom(java.lang.Float.class) || type.equals(Float.TYPE))
            return asFloat(str, (Float)defaultValue);
        if(type.isAssignableFrom(java.lang.Long.class) || type.equals(Long.TYPE))
            return asLong(str, (Long)defaultValue);
        if(type.isAssignableFrom(java.lang.Short.class) || type.equals(Short.TYPE))
            return asShort(str, (Short)defaultValue);
        if(type.isAssignableFrom(java.lang.Byte.class) || type.equals(Byte.TYPE))
            return asByte(str, (Byte)defaultValue);
        if(type.isAssignableFrom(java.lang.Character.class) || type.equals(Character.TYPE))
            return asCharacter(str, (Character)defaultValue);
        if(type.isAssignableFrom(java.math.BigDecimal.class))
            return asBigDecimal(str, (BigDecimal)defaultValue);
        if(type.isAssignableFrom(java.math.BigInteger.class))
            return asBigInteger(str, (BigInteger)defaultValue);
        if(type.isAssignableFrom(java.util.Date.class))
            return asDate(str, (Date)defaultValue);
        else
            return null;
    }

    public static Object asType(Class type, Object obj)
    {
        if(!type.equals(java.lang.String.class) && type.isInstance(obj))
            return obj;
        if(obj == null || (obj instanceof String))
            return asType(type, (String)obj);
        if((obj instanceof Date) && (java.lang.String.class).isAssignableFrom(type))
            return (new SimpleDateFormat(DEFAULT_DATE_PATTTERN)).format((Date)obj);
        if((obj instanceof Number) && (java.lang.Number.class).isAssignableFrom(type))
        {
            Number num = (Number)obj;
            if(type.isAssignableFrom(java.lang.Number.class))
                return num;
            if(type.isAssignableFrom(java.lang.Integer.class))
                return new Integer(num.intValue());
            if(type.isAssignableFrom(java.lang.Double.class))
                return new Double(num.doubleValue());
            if(type.isAssignableFrom(java.lang.Float.class))
                return new Float(num.floatValue());
            if(type.isAssignableFrom(java.lang.Long.class))
                return new Long(num.longValue());
            if(type.isAssignableFrom(java.lang.Short.class))
                return new Short(num.shortValue());
            if(type.isAssignableFrom(java.lang.Byte.class))
                return new Byte(num.byteValue());
            if(type.isAssignableFrom(java.math.BigInteger.class))
                return (new BigDecimal(num.toString())).toBigInteger();
            if(type.isAssignableFrom(java.math.BigDecimal.class))
                return new BigDecimal(num.toString());
        }
        return asType(type, obj.toString());
    }

    public static Object asType(Class type, Object obj, Object defaultValue)
    {
        if(!type.equals(java.lang.String.class) && type.isInstance(obj))
            return obj;
        if(obj == null || (obj instanceof String))
            return asType(type, (String)obj, defaultValue);
        if((obj instanceof Date) && (java.lang.String.class).isAssignableFrom(type))
            return (new SimpleDateFormat(DEFAULT_DATE_PATTTERN)).format((Date)obj);
        if((obj instanceof Number) && (java.lang.Number.class).isAssignableFrom(type))
        {
            Number num = (Number)obj;
            if(type.isAssignableFrom(java.lang.Number.class))
                return num;
            if(type.isAssignableFrom(java.lang.Integer.class))
                return new Integer(num.intValue());
            if(type.isAssignableFrom(java.lang.Double.class))
                return new Double(num.doubleValue());
            if(type.isAssignableFrom(java.lang.Float.class))
                return new Float(num.floatValue());
            if(type.isAssignableFrom(java.lang.Long.class))
                return new Long(num.longValue());
            if(type.isAssignableFrom(java.lang.Short.class))
                return new Short(num.shortValue());
            if(type.isAssignableFrom(java.lang.Byte.class))
                return new Byte(num.byteValue());
            if(type.isAssignableFrom(java.math.BigInteger.class))
                return (new BigDecimal(num.toString())).toBigInteger();
            if(type.isAssignableFrom(java.math.BigDecimal.class))
                return new BigDecimal(num.toString());
        }
        return asType(type, obj.toString(), defaultValue);
    }

    public static String getClassName(Class cls)
    {
        return getClassName(cls.getName());
    }

    public static String getClassName(String fullName)
    {
        if(fullName == null)
        {
            return null;
        } else
        {
            fullName = fullName.trim();
            String className = fullName.substring(fullName.lastIndexOf('.') + 1).replace('$', '.').trim();
            return className.equals("") ? null : className;
        }
    }

    public Strings()
    {
    }

    private static String FALSE_STRINGS[] = {
        "false", "null", "nul", "off", "no", "n"
    };
    private static String DEFAULT_DATE_PATTTERN = "yyyy-M-d";

}