abstractconfiguration.java

解觖java技术中后台无法上传数给的情况

        return getShort(key, new Short(defaultValue)).shortValue();
    }

    /**
     * Get a short associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     *
     * @return The associated short if key is found and has valid
     * format, default value otherwise.
     *
     * @throws ClassCastException is thrown if the key maps to an
     * object that is not a Short.
     * @throws NumberFormatException is thrown if the value mapped
     * by the key has not a valid number format.
     */
    public Short getShort(String key, Short defaultValue)
    {
        Object value = resolveContainerStore(key);

        if (value instanceof Short)
        {
            return (Short) value;
        }
        else if (value instanceof String)
        {
            Short s = new Short((String) value);
            return s;
        }
        else if (value == null)
        {
            if (defaults != null)
            {
                return defaults.getShort(key, defaultValue);
            }
            else
            {
                log.warn("Use Short default value for key '" + key + "' (" + defaultValue + ")");
                return defaultValue;
            }
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a Short object");
        }
    }

    /**
     * Get a string associated with the given configuration key.
     *
     * @param key The configuration key.
     *
     * @return The associated string.
     *
     * @throws ClassCastException is thrown if the key maps to an object that
     *            is not a String.
     * @throws NoSuchElementException is thrown if the key doesn't
     *         map to an existing object.
     */
    public String getString(String key)
    {
        String s = getString(key, null);
        if (s != null)
        {
            return s;
        }
        else
        {
            throw new NoSuchElementException(
                '\'' + key + "' doesn't map to an existing object");
        }
    }

    /**
     * Get a string associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     *
     * @return The associated string if key is found, default value otherwise.
     *
     * @throws ClassCastException is thrown if the key maps to an object that
     *            is not a String.
     */
    public String getString(String key, String defaultValue)
    {
        Object value = resolveContainerStore(key);

        if (value instanceof String)
        {
            return interpolate((String) value);
        }
        else if (value == null)
        {
            if (defaults != null)
            {
                return interpolate(defaults.getString(key, defaultValue));
            }
            else
            {
                log.warn("Use String default value for key '" + key + "' (" + defaultValue + ")");
                return interpolate(defaultValue);
            }
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a String object");
        }
    }

    /**
     * Get an array of strings associated with the given configuration
     * key.
     *
     * @param key The configuration key.
     *
     * @return The associated string array if key is found.
     *
     * @throws ClassCastException is thrown if the key maps to an
     * object that is not a String/Vector of Strings.
     */
    public String[] getStringArray(String key)
    {
        Object value = getPropertyDirect(key);

        String[] tokens;

        if (value instanceof String)
        {
            tokens = new String[1];

            tokens[0] = interpolate((String) value);
        }
        else if (value instanceof Container)
        {
            tokens = new String[((Container) value).size()];

            for (int i = 0; i < tokens.length; i++)
            {
                tokens[i] = interpolate((String) ((Container) value).get(i));
            }
        }
        else if (value == null)
        {
            if (defaults != null)
            {
                tokens = defaults.getStringArray(key);
            }
            else
            {
                tokens = new String[0];
            }
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a String/Vector object");
        }
        return tokens;
    }

    /**
     * Get a Vector of strings associated with the given configuration key.
     *
     * @param key The configuration key.
     *
     * @return The associated Vector.
     *
     * @throws ClassCastException is thrown if the key maps to an
     * object that is not a Vector.
     * @throws NoSuchElementException is thrown if the key doesn't
     *         map to an existing object.
     */
    public Vector getVector(String key)
    {
        Vector v = getVector(key, null);
        if (v != null)
        {
            return v;
        }
        else
        {
            throw new NoSuchElementException(
                '\'' + key + "' doesn't map to an existing object");
        }
    }

    /**
     * Get a Vector of strings associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     *
     * @return The associated Vector.
     *
     * @throws ClassCastException is thrown if the key maps to an
     * object that is not a Vector.
     */
    public Vector getVector(String key, Vector defaultValue)
    {
        Object value = getPropertyDirect(key);
        Vector v = null;

        if (value instanceof String)
        {
            v = new Vector(1);
            v.addElement(value);
        }
        else if (value instanceof Container)
        {
            v = ((Container) value).asVector();
        }
        else if (value == null)
        {
            if (defaults != null)
            {
                v = defaults.getVector(key, defaultValue);
            }
            else
            {
                v = ((defaultValue == null) ? new Vector() : defaultValue);
            }
        }
        else
        {
            throw new ClassCastException(
                '\''
                    + key
                    + "' doesn't map to a Vector object: "
                    + value
                    + ", a "
                    + value.getClass().getName());
        }
        return v;
    }

    /**
     * Returns an object from the store described by the key.
     * If the value is a Container object, replace it with the
     * first object in the container
     *
     * @param key The property key.
     *
     * @return value Value, transparently resolving a possible
     *               Container dependency.
     */
    private Object resolveContainerStore(String key)
    {
        Object value = getPropertyDirect(key);
        if (value != null && value instanceof Container)
        {
            value = ((Container) value).get(0);
        }
        return value;
    }

    /**
     * This class divides into tokens a property value.  Token
     * separator is "," but commas into the property value are escaped
     * using the backslash in front.
     */
    class PropertiesTokenizer extends StringTokenizer
    {
        /** The property delimiter used while parsing (a comma). */
        static final String DELIMITER = ",";

        /**
         * Constructor.
         *
         * @param string A String.
         */
        public PropertiesTokenizer(String string)
        {
            super(string, DELIMITER);
        }

        /**
         * Check whether the object has more tokens.
         *
         * @return True if the object has more tokens.
         */
        public boolean hasMoreTokens()
        {
            return super.hasMoreTokens();
        }

        /**
         * Get next token.
         *
         * @return A String.
         */
        public String nextToken()
        {
            StringBuffer buffer = new StringBuffer();

            while (hasMoreTokens())
            {
                String token = super.nextToken();
                if (token.endsWith("\\"))
                {
                    buffer.append(token.substring(0, token.length() - 1));
                    buffer.append(DELIMITER);
                }
                else
                {
                    buffer.append(token);
                    break;
                }
            }
            return buffer.toString().trim();
        }
    } // class PropertiesTokenizer

    /**
     * Private Wrapper class for Vector, so we can distinguish between
     * Vector objects and our container
     */
    static class Container
    {
        /** We're wrapping a List object (A vector) */
        private List l = null;

        /**
         * C'tor
         */
        public Container()
        {
            l = new Vector(INITIAL_LIST_SIZE);
        }

        /**
         * Add an Object to the Container
         *
         * @param o The Object
         */
        public void add(Object o)
        {
            l.add(o);
        }

        /**
         * Returns the current size of the Container
         *
         * @return The Number of elements in the container
         */
        public int size()
        {
            return l.size();
        }

        /**
         * Returns the Element at an index
         *
         * @param index The Index
         * @return The element at that index
         */
        public Object get(int index)
        {
            return l.get(index);
        }

        /**
         * Returns an Iterator over the container objects
         *
         * @return An Iterator
         */
        public Iterator iterator()
        {
            return l.iterator();
        }

        /**
         * Returns the Elements of the Container as
         * a Vector. This is not the internal vector
         * element but a shallow copy of the internal
         * list. You may modify the returned list without
         * modifying the container.
         *
         * @return A Vector containing the elements of the Container.
         */
        public Vector asVector()
        {
            Vector v = new Vector(l.size());

            for (Iterator it = l.iterator(); it.hasNext();)
            {
                v.add(it.next());
            }
            return v;
        }
    }
}