jndiconfiguration.java

java servlet著名论坛源代码

     */
    public Boolean getBoolean(String key, Boolean defaultValue)
    {
        Object value = getValueFromJNDI(key);
        if (value instanceof Boolean)
        {
            return (Boolean) value;
        }
        else if (value instanceof String)
        {
            return testBoolean((String) value);
        }
        else if (value == null)
        {
            if (defaults != null)
            {
                return defaults.getBoolean(key, defaultValue);
            }
            else
            {
                return defaultValue;
            }
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a Boolean object");
        }
    }

    /**
     * Get a byte associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     * @return The associated byte 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 Byte.
     * @throws NumberFormatException is thrown if the value mapped by the key
     *            has not a valid number format.
     */
    public Byte getByte(String key, Byte defaultValue)
    {
        Object value = getValueFromJNDI(key);
        if (value instanceof Byte)
        {
            return (Byte) value;
        }
        else if (value instanceof String)
        {
            Byte b = new Byte((String) value);
            return b;
        }
        else if (value == null)
        {
            return defaultValue;
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a Byte object");
        }
    }

    /**
     * Get a double associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     * @return The associated double 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 Double.
     * @throws NumberFormatException is thrown if the value mapped
     * by the key has not a valid number format.
     */
    public Double getDouble(String key, Double defaultValue)
    {
        Object value = this.getValueFromJNDI(key);
        if (value instanceof Double)
        {
            return (Double) value;
        }
        else if (value instanceof String)
        {
            Double d = new Double((String) value);
            return d;
        }
        else if (value == null)
        {
            return defaultValue;
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a Double object");
        }
    }

    /**
     * Get a float associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     * @return The associated float 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 Float.
     * @throws NumberFormatException is thrown if the value mapped
     * by the key has not a valid number format.
     */
    public Float getFloat(String key, Float defaultValue)
    {
        Object value = getValueFromJNDI(key);
        if (value instanceof Float)
        {
            return (Float) value;
        }
        else if (value instanceof String)
        {
            Float f = new Float((String) value);
            return f;
        }
        else if (value == null)
        {
            return defaultValue;
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a Float object");
        }
    }

    /**
     * Get a int associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     * @return The associated int 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 Integer.
     * @throws NumberFormatException is thrown if the value mapped by the key
     *         has not a valid number format.
     */
    public Integer getInteger(String key, Integer defaultValue)
    {
        Object value = getValueFromJNDI(key);
        if (value instanceof Integer)
        {
            return (Integer) value;
        }
        else if (value instanceof String)
        {
            Integer i = new Integer((String) value);
            return i;
        }
        else if (value == null)
        {
            return defaultValue;
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a Integer object");
        }
    }

    /**
     * Get a long associated with the given configuration key.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     * @return The associated long 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 Long.
     * @throws NumberFormatException is thrown if the value mapped
     * by the key has not a valid number format.
     */
    public Long getLong(String key, Long defaultValue)
    {
        Object value = getValueFromJNDI(key);
        if (value instanceof Long)
        {
            return (Long) value;
        }
        else if (value instanceof String)
        {
            Long l = new Long((String) value);
            return l;
        }
        else if (value == null)
        {
            return defaultValue;
        }
        else
        {
            throw new ClassCastException(
                '\'' + key + "' doesn't map to a Long object");
        }
    }

    /**
     * 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 = getValueFromJNDI(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)
        {
            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.
     * @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)
    {
        try
        {
            Object o = getValueFromJNDI(key);
            if (o == null)
            {
                return defaultValue;
            }
            else
            {
                return (String) o;
            }
        }
        catch (NoSuchElementException nsee)
        {
            return defaultValue;
        }
    }
    /**
     * 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 = getValueFromJNDI(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)
        {
            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.
     * Typically this will be just a single item, as you can't have multiple
     * properties with the same name.
     *
     * @param key The configuration key.
     * @param defaultValue The default value.
     * @return The associated Vector.
     */
    public Vector getVector(String key, Vector defaultValue)
    {
        try
        {
            Object value = this.getValueFromJNDI(key);
            if (value != null)
            {
                Vector v = new Vector(1);
                v.add(value.toString());
                return v;
            }
            else
            {
                if (defaultValue == null)
                {
                    defaultValue = new Vector();
                }
                return defaultValue;
            }
        }
        catch (NoSuchElementException nsse)
        {
            return defaultValue;
        }
    }
    /**
     * @return String
     */
    public String getPrefix()
    {
        return prefix;
    }
    /**
     * Sets the prefix.
     * @param prefix The prefix to set
     */
    public void setPrefix(String prefix)
    {
        this.prefix = prefix;
    }
    private Object getValueFromJNDI(String key)
    {
        if (clearedProperties.contains(key))
        {
            return null;
        }
        try
        {
            key = StringUtils.replace(key, ".", "/");
            return getContext().lookup(key);
        }
        catch (java.util.NoSuchElementException nsse)
        {
            return null;
        }
        catch (NamingException ne)
        {
            return null;
        }
    }
    private Context getContext() throws NamingException
    {
        if (envCtx == null)
        {
            Context initCtx = new InitialContext();
            envCtx = (Context) initCtx.lookup(getPrefix());
        }
        return envCtx;
    }
}