XMLConfig

Class FQN: it.greenvulcano.configuration.XMLConfig

XMLConfig public static methods

/**
* Reads a value. If the XPath selects many nodes the values are appended
* together.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* 
* @return the searched value or null if the XPath select no
*         node.
* 
* @throws XMLConfigException
*         if some error occurs.
* 
*/
public static String get(String file, String xpath) throws XMLConfigException

/**
* Reads a value. If the XPath selects many nodes the values are appended
* together.
* 
* @param node
*        base for XPath
* @param xpath
*        parameter to read specified as relative path to the node.
* 
* @return the searched value or null if the XPath selects no node.
* 
* @throws XMLConfigException
*         if some error occurs.
* 
*/
public static String get(Node node, String xpath) throws XMLConfigException

/**
* Reads a value. If the XPath selects many nodes the values are appended
* together.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         selects no node or an error occurs.
* 
*/
public static String get(String file, String xpath, String defaultValue)

/**
* Reads a value. If the XPath selects many nodes the values are appended
* together.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static String get(Node node, String xpath, String defaultValue)

/**
* Reads a single encrypted value.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* @param keyId
*        the key id to be used for decryption, if null or empty is used
*        DEFAULT_KEY_ID
* @param canBeClear
*        if true the data can be unencrypted
* 
* @return the searched value or null if the XPath select no node.
* @throws XMLConfigException
*         if some error occurs.
* 
*/
public static String getDecrypted(String file, String xpath, String keyId, boolean canBeClear)
         throws XMLConfigException

/**
* Reads a single encrypted value.
* 
* @param node
*        base for XPath
* @param xpath
*        parameter to read specified as relative path to the node.
* @param keyId
*        the key id to be used for decryption, if null or empty is used
*        DEFAULT_KEY_ID
* @param canBeClear
*        if true the data can be unencrypted
* 
* @return the searched value or null if the XPath selects no node.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static String getDecrypted(Node node, String xpath, String keyId, boolean canBeClear)
        throws XMLConfigException
    
/**
* Reads a single encrypted value.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* @param keyId
*        the key id to be used for decryption, if null or empty is used
*        DEFAULT_KEY_ID
* @param canBeClear
*        if true the data can be unencrypted
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static String getDecrypted(String file, String xpath, String keyId, boolean canBeClear, String defaultValue)

/**
* Reads a single encrypted value.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param keyId
*        the key id to be used for decryption, if null or empty is used
*        DEFAULT_KEY_ID
* @param canBeClear
*        if true the data can be unencrypted
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static String getDecrypted(Node node, String xpath, String keyId, boolean canBeClear, String defaultValue)

/**
* Reads a single encrypted value.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* 
*        Sets the key id as DEFAULT_KEY_ID and canBeClear at true
* 
* @return the searched value or null if the XPath select no node.
* @throws XMLConfigException
*         if some error occurs.
* 
*/
public static String getDecrypted(String file, String xpath) throws XMLConfigException

/**
* Reads a single encrypted value.
* 
* @param node
*        base for XPath
* @param xpath
*        parameter to read specified as relative path to the node.
* 
*        Sets the key id as DEFAULT_KEY_ID and canBeClear at true
* 
* @return the searched value or null if the XPath select no node.
* 
* @throws XMLConfigException
*         if some error occurs.
* 
*/
public static String getDecrypted(Node node, String xpath) throws XMLConfigException

/**
* Reads a single encrypted value.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* @param defaultValue
*        default value
* 
*        Sets the key id as DEFAULT_KEY_ID and canBeClear at true
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static String getDecrypted(String file, String xpath, String defaultValue)

/**
* Reads a single encrypted value.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param defaultValue
*        default value
* 
*        Sets the key id as DEFAULT_KEY_ID and canBeClear at true
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static String getDecrypted(Node node, String xpath, String defaultValue)

/**
* Decrypt a string encrypted by default XMLConfig key.
* 
* @param value
*        the value to decrypt
* 
* @return the decrypted value or value if not encrypted
* @throws XMLConfigException
*         if some error occurs.
* 
*/
 public static String getDecrypted(String value) throws XMLConfigException

/**
* Encrypt a string using default XMLConfig key.
* 
* @param value
*        the value to encrypt
* 
* @return the encrypted value
* @throws XMLConfigException
*         if some error occurs.
* 
*/
public static String getEncrypted(String value) throws XMLConfigException

/**
* Return an integer parameter. 
* This method uses get() to obtain the value, then convert it
* to an integer.
* 
* @param file
* @param xpath
* @return the searched integer value from the configuration.
* 
* @throws XMLConfigException
*         if any error occurs
*/
public static int getInteger(String file, String xpath) throws XMLConfigException

/**
* Return an integer parameter.
* This method uses get() to obtain the value, then convert it
* to an integer.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* 
* @return the searched integer value from the configuration.
* 
* @throws XMLConfigException
*         if an error occurs
*/
public static int getInteger(Node node, String xpath) throws XMLConfigException

/**
* Return an integer parameter.
* This method uses get() to obtain the value, then convert it
* to an integer.
* 
* @param file
*        the configuration file
* @param xpath
*        the XPath to search
* @param defaultValue
*        value to return if XPath not match
* @return the parameter value. If the parameter does not exists or an error
*         occurs then the specified default value will be returned.
* 
*/
public static int getInteger(final String file, final String xpath, final int defaultValue)

/**
* Return an integer parameter. 
* This method uses get() to obtain the value, then convert it
* to an integer.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static int getInteger(Node node, String xpath, int defaultValue)

/**
* Returns a long parameter.
* This method uses get() to obtain the value, then converts it
* to a long.
* 
* @param file
* @param xpath
* @return the searched long value from the configuration.
* 
* @throws XMLConfigException
*         if an error occurs
*/
public static long getLong(String file, String xpath) throws XMLConfigException

/**
* Returns a long parameter.
* This method uses get() to obtain the value, then convert it
* to a long.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* 
* @return the searched long value from the configuration.
* 
* @throws XMLConfigException
*         if an error occurs
*/
public static long getLong(Node node, String xpath) throws XMLConfigException

/**
* Returns a long parameter.
* This method uses get() to obtain the value, then convert it
* to a long.
* 
* @param file
* @param xpath
* @param defaultValue
* 
* @return the parameter value. If the parameter does not exists or an error
*         occurs then the specified default value will be returned.
* 
*/
public static long getLong(String file, String xpath, long defaultValue)

/**
* Returns a long parameter.
* This method uses get() to obtain the value, then convert it
* to a long.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param defaultValue
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static long getLong(Node node, String xpath, long defaultValue)

/**
* Returns a double parameter.
* This method uses get() to obtain the value, then convert it
* to a double.
* 
* @param file
* @param xpath
* @return the searched double value from the configuration.
* 
* @throws XMLConfigException
*         if an error occurs
*/
public static double getDouble(String file, String xpath) throws XMLConfigException

/**
* Returns a double parameter. 
* This method uses get() to obtain the value, then convert it
* to a double.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* 
* @return the searched double value from the configuration.
* 
* @throws XMLConfigException
*         if an error occurs
*/
public static double getDouble(Node node, String xpath) throws XMLConfigException

/**
* Return a double parameter.
* This method uses get() to obtain the value, then convert it
* to a double.
* 
* @param file
* @param xpath
* @param defaultValue
* 
* @return the parameter value. If the parameter does not exists or an error
*         occurs then the specified default value will be returned.
* 
*/
public static double getDouble(String file, String xpath, double defaultValue)

/**
* Returns a double parameter.
* This method uses get() to obtain the value, then convert it
* to a double.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static double getDouble(Node node, String xpath, double defaultValue)

/**
* Returns a float parameter.
* This method uses get() to obtain the value, then convert it
* to a float.
* 
* @param file
* @param xpath
* @return the searched float value from the configuration.
* 
* @throws XMLConfigException
*         if an error occurs
*/
public static float getFloat(String file, String xpath) throws XMLConfigException

/**
* Return a float parameter.
* This method uses get() to obtain the value, then converts it
* to a float.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* 
* @return the searched float value from the configuration.
* 
* @throws XMLConfigException
*         if an error occurs
*/
public static float getFloat(Node node, String xpath) throws XMLConfigException

/**
* Return a float parameter.
* This method uses get() to obtain the value, then converts it
* to a float.
* 
* @param file
* @param xpath
* @param defaultValue
* 
* @return the parameter value. If the parameter does not exists or an error
*         occurs then the specified default value will be returned.
* 
*/
public static float getFloat(String file, String xpath, float defaultValue)

/**
* Returns a float parameter.
* This method uses get() to obtain the value, then converts it
* to a float.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
* 
*/
public static float getFloat(Node node, String xpath, float defaultValue)

/**
* Returns a boolean parameter.
* 
* The value returned is true if and only if the parameter red is
* equal, ignoring case, to "true" or "yes" or "on". Otherwise, it returns
* false.
* 
* @param file
* @param xpath
* @return the boolean value of the parameter.
* @throws XMLConfigException
*/
public static boolean getBoolean(String file, String xpath) throws XMLConfigException

/**
* Returns a boolean parameter.
* 
* The value returned is true if and only if the parameter red is
* equal, ignoring case, to "true" or "yes" or "on". Otherwise, it returns
* false.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* 
* @return the searched boolean value from the configuration.
* 
* @throws XMLConfigException
*/
public static boolean getBoolean(Node node, String xpath) throws XMLConfigException

/**
* Returns a boolean parameter.
* 
* The value returned is true if and only if the parameter red is
* equal, ignoring case, to "true" or "yes" or "on". Otherwise, it returns
* false.
* 
* @param file
* @param xpath
* @param defaultValue
* @return the boolean value of the parameter. If the parameter does not
*         exists or an error occurs then the specified default value will
*         be returned.
*/
public static boolean getBoolean(String file, String xpath, boolean defaultValue)

/**
* Returns a boolean parameter.
* 
* The value returned is true if and only if the parameter red is
* equal, ignoring case, to "true" or "yes" or "on". Otherwise, it returns
* false.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to node.
* @param defaultValue
*        default value
* 
* @return the searched value or the specified default value if the XPath
*         select no node or an error occurs.
*/
public static boolean getBoolean(Node node, String xpath, boolean defaultValue)

/**
* Checks if the given parameter exists. <br>
* It checks that get() method does not return null.
* 
* @param file
* @param xpath
* @return if the given parameter exists.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static boolean exists(String file, String xpath) throws XMLConfigException

/**
* Checks if the given parameter exists.
* It checks that get() method does not return null.
* 
* @param node
* @param xpath
* @return if the given parameter exists
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static boolean exists(Node node, String xpath) throws XMLConfigException

/**
* Obtains a list of nodes that match the given XPath.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* @return a list of nodes that match the given XPath.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static NodeList getNodeList(String file, String xpath) throws XMLConfigException

/**
* Obtains a list of nodes that match the given XPath.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to the node
* @return a list of nodes that match the given XPath.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static NodeList getNodeList(Node node, String xpath) throws XMLConfigException

/**
* Obtains a list of nodes that match the given XPath as a Collection.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* @return a list of nodes that match the given XPath as a
*         Collection.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static Collection<Node> getNodeListCollection(String file, String xpath) throws XMLConfigException

/**
* Obtains a list of nodes that match the given XPath as a Collection.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to the node
* @return a list of nodes that match the given XPath as a
*         Collection.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static Collection<Node> getNodeListCollection(Node node, String xpath) throws XMLConfigException

/**
* Obtains a single node that matches the given XPath.
* 
* @param file
*        file to read
* @param xpath
*        parameter to read specified as absolute path to the root of the
*        file.
* @return a single node that matches the given XPath.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static Node getNode(String file, String xpath) throws XMLConfigException

/**
* Obtains a single node that matches the given XPath.
* 
* @param node
*        base node for XPath
* @param xpath
*        parameter to read specified as relative path to the node
* @return a single node that matches the given XPath.
* 
* @throws XMLConfigException
*         if some error occurs.
*/
public static Node getNode(Node node, String xpath) throws XMLConfigException

XMLConfig configuration events management methods

/**
* Add a ConfigurationListener.
* 
* @param listener
*/
public static void addConfigurationListener(ConfigurationListener listener)

/**
* Adds a ConfigurationListener listening for events related to a single
* particular file.
* 
* @param listener
*        a ConfigurationListener object
* @param filename
*        a String containing the name of a file whose changes must
*        be notified to the given listener
*/
public static void addConfigurationListener(ConfigurationListener listener, String filename)

/**
* Add a ConfigurationListener listening for events related to a particular
* set of files.
* 
* @param listener
*        a ConfigurationListener object
* @param fileList
*        a List of String s containing the name of files
*        whose changes must be notified to the given listener
*/
public static void addConfigurationListener(ConfigurationListener listener, List<String> fileList)
    
/**
* Removes a ConfigurationListener
* 
* @param listener
*/
public static void removeConfigurationListener(ConfigurationListener listener)

/**
* Removes a ConfigurationListener listening for changes on a single file
* 
* @param listener
*        a ConfigurationListener object
* @param filename
*        a String containing the name of a file whose changes must
*        be notified to the given listener
*/
public static void removeConfigurationListener(ConfigurationListener listener, String filename)

/**
* Remove a ConfigurationListener listening for changes on a subset of files
* 
* @param listener
*        a ConfigurationListener object
* @param fileList
*        a List of String s containing the name of files
*        whose changes must be notified to the given listener
*/
public static void removeConfigurationListener(ConfigurationListener listener, List<String> fileList)

XMLConfig file management methods

/**
* Loads a configuration file and, if necessary, notifies registered
* listeners. This method can be used in order to preload the configuration
* file.
* 
* @param file
*        the file to read
* @return the complete URL used to load the file.
* @exception XMLConfigException
*            if error occurs
*/
public static synchronized URL load(String file) throws XMLConfigException

/**
* Loads a configuration file and, if necessary, notifies registered
* listeners. This method can be used in order to preload the configuration
* file.
* 
* @param file
*        the file to read
* @param classLoader
*        the class loader to use to retrieve the file to read
* @param force
*        force the reload of file if already present in cache
* @param canBeReloaded
*        flag that indicates if this file can be changed and can be
*        reloaded
* @return the complete URL used to load the file.
* @exception XMLConfigException
*            if error occurs
*/
public static synchronized URL load(String file, ClassLoader classLoader, boolean force, boolean canBeReloaded)
         throws XMLConfigException
/**
* Discards all cached configuration files, notifies all registered
* listeners, reload discarded files and notifies all registered listeners.
* 
* @exception XMLConfigException
*            if error occurs
*/
public static synchronized void reloadAll() throws XMLConfigException

/**
* If loaded discards the given file and notifies all registered listeners,
* then reloads the given file (only if it was previously loaded) and
* notifies all registered listeners.
* 
* @param file
*        the file to reload
* @exception XMLConfigException
*            if error occurs
*/
public static synchronized void reload(String file) throws XMLConfigException

/**
* Discards all cached files and notifies all listeners.
*/
public static synchronized void discardAll()

/**
* Discards the given file. If the file was previously loaded then the
* listeners will be notified, otherwise no action will be taken.
* 
* @param file
*        the file to discard
*/
public static synchronized void discard(String file)

/**
* Returns an array of String s containing the names of the files
* currently loaded into XMLConfig private cache.
* 
* @return an array of String s containing the names of the files
*         currently loaded into XMLConfig private cache.
*/
public static synchronized String[] getLoadedFiles()

XMLConfig utility methods

/**
* Sets the entity resolver used to resolve entities into the configuration
* files.
* 
* @param entityResolver
*        EntityResolver to use in order to resolve entity. If
*        null is specified then the default XML mechanism is
*        used.
*/
public static synchronized void setEntityResolver(EntityResolver entityResolver)

/**
* Uses the default entity resolver to resolve entities into the
* configuration files. The default entity resolver does not resolve
* anything.
* 
* @see #setEntityResolver(org.xml.sax.EntityResolver)
*/
public static synchronized void setDefaultEntityResolver()

/**
* Returns the entity resolver for the configuration.
* 
* @return the entity resolver for the configuration
*/
public static synchronized EntityResolver getEntityResolver()