localutil.java

Ajax 框架,可以用来做数型菜单或者联动下拉列表

        if (paramType == Character.class || paramType == Character.TYPE)
        {
            if (value.length() == 1)
            {
                return new Character(value.charAt(0));
            }
            else
            {
                throw new IllegalArgumentException("Can't more than one character in string - can't convert to char: '" + value + "'"); //$NON-NLS-1$ //$NON-NLS-2$
            }
        }

        String trimValue = value.trim();

        if (paramType == Boolean.class || paramType == Boolean.TYPE)
        {
            return Boolean.valueOf(trimValue);
        }

        if (paramType == Integer.class || paramType == Integer.TYPE)
        {
            if (trimValue.length() == 0)
            {
                return new Integer(0);
            }
            return Integer.valueOf(trimValue);
        }

        if (paramType == Short.class || paramType == Short.TYPE)
        {
            if (trimValue.length() == 0)
            {
                return new Short((short) 0);
            }
            return Short.valueOf(trimValue);
        }

        if (paramType == Byte.class || paramType == Byte.TYPE)
        {
            if (trimValue.length() == 0)
            {
                return new Byte((byte) 0);
            }
            return Byte.valueOf(trimValue);
        }

        if (paramType == Long.class || paramType == Long.TYPE)
        {
            if (trimValue.length() == 0)
            {
                return new Long(0);
            }
            return Long.valueOf(trimValue);
        }

        if (paramType == Float.class || paramType == Float.TYPE)
        {
            if (trimValue.length() == 0)
            {
                return new Float(0);
            }
            return Float.valueOf(trimValue);
        }

        if (paramType == Double.class || paramType == Double.TYPE)
        {
            if (trimValue.length() == 0)
            {
                return new Double(0);
            }
            return Double.valueOf(trimValue);
        }

        throw new IllegalArgumentException("Unsupported conversion type: " + paramType.getName()); //$NON-NLS-1$
    }

    /**
     * The javascript outbound marshaller prefixes the toString value with a
     * colon and the original type information. This undoes that.
     * @param data The string to be split up
     * @return A string array containing the split data
     */
    public static String[] splitInbound(String data)
    {
        String[] reply = new String[2];

        int colon = data.indexOf(ConversionConstants.INBOUND_TYPE_SEPARATOR);
        if (colon == -1)
        {
            log.error("Missing : in conversion data (" + data + ')'); //$NON-NLS-1$
            reply[LocalUtil.INBOUND_INDEX_TYPE] = ConversionConstants.TYPE_STRING;
            reply[LocalUtil.INBOUND_INDEX_VALUE] = data;
        }
        else
        {
            reply[LocalUtil.INBOUND_INDEX_TYPE] = data.substring(0, colon);
            reply[LocalUtil.INBOUND_INDEX_VALUE] = data.substring(colon + 1);
        }

        return reply;
    }

    /**
     * Get the short class name (i.e. without the package part)
     * @param clazz the class to get the short name of
     * @return the class name of the class without the package name
     */
    public static String getShortClassName(Class clazz)
    {
        String className = clazz.getName();

        char[] chars = className.toCharArray();
        int lastDot = 0;
        for (int i = 0; i < chars.length; i++)
        {
            if (chars[i] == '.')
            {
                lastDot = i + 1;
            }
            else if (chars[i] == '$')
            {
                chars[i] = '.';
            }
        }

        return new String(chars, lastDot, chars.length - lastDot);
    }

    /**
     * Is this object property one that we can use in a JSON style or do we need
     * to get fancy. i.e does it contain only letters and numbers with an
     * initial letter.
     * @param name The name to test for JSON compatibility
     * @return true if the name is simple
     */
    public static boolean isSimpleName(String name)
    {
        if (name.length() == 0)
        {
            return false;
        }

        if (JavascriptUtil.isReservedWord(name))
        {
            return false;
        }

        boolean isSimple = Character.isLetter(name.charAt(0));
        for (int i = 1; isSimple && i < name.length(); i++)
        {
            if (!Character.isLetterOrDigit(name.charAt(i)))
            {
                isSimple = false;
            }
        }

        return isSimple;
    }

    /**
     * Utility to essentially do Class.forName with the assumption that the
     * environment expects failures for missing jar files and can carry on if
     * this process fails.
     * @param name The name for debugging purposes
     * @param className The class to create
     * @param impl The implementation class - what should className do?
     * @return The class if it is safe or null otherwise.
     */
    public static Class classForName(String name, String className, Class impl)
    {
        Class clazz;

        try
        {
            clazz = Class.forName(className);
        }
        catch (ClassNotFoundException ex)
        {
            log.info("Skipping '" + name + "' due to ClassNotFoundException on " + className + ". Cause: " + ex.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
            return null;
        }
        catch (NoClassDefFoundError ex)
        {
            log.info("Skipping '" + name + "' due to NoClassDefFoundError on " + className + ". Cause: " + ex.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
            return null;
        }

        // Check it is of the right type
        if (!impl.isAssignableFrom(clazz))
        {
            throw new IllegalArgumentException(Messages.getString("DefaultCreatorManager.CreatorNotAssignable", clazz.getName(), impl.getName())); //$NON-NLS-1$
        }

        // Check we can create it
        try
        {
            clazz.newInstance();
        }
        catch (InstantiationException ex)
        {
            throw new IllegalArgumentException(Messages.getString("DefaultCreatorManager.CreatorNotInstantiatable", className, ex.toString())); //$NON-NLS-1$
        }
        catch (IllegalAccessException ex)
        {
            throw new IllegalArgumentException(Messages.getString("DefaultCreatorManager.CreatorNotAccessable", className, ex.toString())); //$NON-NLS-1$
        }
        catch (Exception ex)
        {
            // For some reason we can't catch this?
            if (ex instanceof ClassNotFoundException)
            {
                log.info("Skipping '" + name + "' due to ClassNotFoundException on " + className + ". Cause: " + ex.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                return null;
            }
            else
            {
                log.warn("Failed to load '" + name + "' (" + className + ")", ex); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                return null;
            }
        }

        return clazz;
    }

    /**
     * Calling methods using reflection is useful for graceful fallback - this
     * is a helper method to make this easy
     * @param object The object to use as 'this'
     * @param method The method to call, can be null in which case null is returned
     * @param params The parameters to pass to the reflection call
     * @return The results of calling method.invoke() or null
     * @throws IllegalStateException If anything goes wrong
     */
    public static Object invoke(Object object, Method method, Object[] params) throws IllegalStateException
    {
        Object reply = null;
        if (method != null)
        {
            try
            {
                reply = method.invoke(object, params);
            }
            catch (InvocationTargetException ex)
            {
                throw new IllegalStateException("InvocationTargetException calling " + method.getName() + ": " + ex.getTargetException().toString()); //$NON-NLS-1$ //$NON-NLS-2$
            }
            catch (Exception ex)
            {
                throw new IllegalStateException("Reflection error calling " + method.getName() + ": " + ex.toString()); //$NON-NLS-1$ //$NON-NLS-2$
            }
        }

        return reply;
    }

    /**
     * Utility to essentially do Class.forName and newInstance with the
     * assumption that the environment expects failures for missing jar files
     * and can carry on if this process fails.
     * @param name The name for debugging purposes
     * @param className The class to create
     * @param impl The implementation class - what should className do?
     * @return The new instance if it is safe or null otherwise.
     */
    public static Object classNewInstance(String name, String className, Class impl)
    {
        Class clazz;

        try
        {
            clazz = Class.forName(className);
        }
        catch (ClassNotFoundException ex)
        {
            log.info("Skipping '" + name + "' due to ClassNotFoundException on " + className + ". Cause: " + ex.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
            return null;
        }
        catch (NoClassDefFoundError ex)
        {
            log.info("Skipping '" + name + "' due to NoClassDefFoundError on " + className + ". Cause: " + ex.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
            return null;
        }

        // Check it is of the right type
        if (!impl.isAssignableFrom(clazz))
        {
            throw new IllegalArgumentException(Messages.getString("DefaultCreatorManager.CreatorNotAssignable", clazz.getName(), impl.getName())); //$NON-NLS-1$
        }

        // Check we can create it
        try
        {
            return clazz.newInstance();
        }
        catch (InstantiationException ex)
        {
            throw new IllegalArgumentException(Messages.getString("DefaultCreatorManager.CreatorNotInstantiatable", className, ex.toString())); //$NON-NLS-1$
        }
        catch (IllegalAccessException ex)
        {
            throw new IllegalArgumentException(Messages.getString("DefaultCreatorManager.CreatorNotAccessable", className, ex.toString())); //$NON-NLS-1$
        }
        catch (Exception ex)
        {
            log.warn("Failed to load creator '" + name + "', classname=" + className + ": ", ex); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
            return null;
        }
    }

    /**
     * InputStream closer that can cope if the input stream is null.
     * If anything goes wrong, the errors are logged and ignored.
     * @param in The resource to close
     */
    public static void close(InputStream in)
    {
        if (in == null)
        {
            return;
        }

        try
        {
            in.close();
        }
        catch (IOException ex)
        {
            log.warn(ex.getMessage(), ex);
        }
    }

    /**
     * InputStream closer that can cope if the input stream is null.
     * If anything goes wrong, the errors are logged and ignored.
     * @param in The resource to close
     */
    public static void close(RandomAccessFile in)
    {
        if (in == null)
        {
            return;
        }

        try
        {
            in.close();
        }
        catch (IOException ex)
        {
            log.warn(ex.getMessage(), ex);
        }
    }

    /**
     * The log stream
     */
    private static final Logger log = Logger.getLogger(LocalUtil.class);

    /**
     * Have we given a warning about URLDecoder.decode() in jdk 1.3
     */
    private static boolean warn13 = false;

    /**
     * Have we tested for the correct URLDecoder.decode()
     */
    private static boolean testedDecoder = false;

    /**
     * Are we using the jdk 1.4 version of URLDecoder.decode()
     */
    private static Method decode14 = null;
}