com.opensymphony.module.sitemesh.mapper

Class ConfigLoader

java.lang.Object

com.opensymphony.module.sitemesh.mapper.ConfigLoader

public final class ConfigLoader
extends java.lang.Object

The ConfigLoader reads a configuration XML file that contains Decorator definitions (name, url, init-params) and path-mappings (pattern, name).

These can then be accessed by the getDecoratorByName() methods and getMappedName() methods respectively.

The DTD for the configuration file in old (deprecated) format is located at http://www.opensymphony.com/dtds/sitemesh_1_0_decorators.dtd .

The DTD for the configuration file in new format is located at http://www.opensymphony.com/dtds/sitemesh_1_5_decorators.dtd .

Editing the config file will cause it to be auto-reloaded.

This class is used by ConfigDecoratorMapper, and uses PathMapper for pattern matching.

Version:

$Revision: 1.4 $

Author:

Joe Walnes, Mathias Bogaert

See Also:

ConfigDecoratorMapper, PathMapper

Field Summary

Fields

Modifier and Type	Field and Description
private Config	config
private java.io.File	configFile
private java.lang.String	configFileName
private long	configLastModified
private java.util.Map	decorators
private PathMapper	pathMapper

Constructor Summary

Constructors

Constructor and Description
ConfigLoader(java.io.File configFile) Create new ConfigLoader using supplied File.
ConfigLoader(java.lang.String configFileName, Config config) Create new ConfigLoader using supplied filename and config.

Method Summary

Methods

Modifier and Type	Method and Description
private static java.lang.String	getAttribute(org.w3c.dom.Element element, java.lang.String name) Override default behavior of element.getAttribute (returns the empty string) to return null.
private static java.lang.String	getContainedText(org.w3c.dom.Node parent, java.lang.String childTagName) With a given parent XML Element, find the text contents of the child element with supplied name.
Decorator	getDecoratorByName(java.lang.String name) Retrieve Decorator based on name specified in configuration file.
java.lang.String	getMappedName(java.lang.String path) Get name of Decorator mapped to given path.
private void	loadConfig() Load configuration from file.
private void	parseConfig(org.w3c.dom.Document document) Parse configuration from XML document.
private void	populatePathMapper(org.w3c.dom.NodeList patternNodes, java.lang.String role, java.lang.String name) Extracts each URL pattern and adds it to the pathMapper map.
private void	refresh() Check if configuration file has been updated, and if so, reload.
private void	storeDecorator(Decorator d) Store Decorator in Map

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

decorators

private java.util.Map decorators

configLastModified

private long configLastModified

configFile

private java.io.File configFile

configFileName

private java.lang.String configFileName

pathMapper

private PathMapper pathMapper

config

private Config config

Constructor Detail

ConfigLoader

public ConfigLoader(java.io.File configFile)
             throws javax.servlet.ServletException

Create new ConfigLoader using supplied File.

Throws:

javax.servlet.ServletException

ConfigLoader

public ConfigLoader(java.lang.String configFileName,
            Config config)
             throws javax.servlet.ServletException

Create new ConfigLoader using supplied filename and config.

Throws:

javax.servlet.ServletException

Method Detail

getDecoratorByName

public Decorator getDecoratorByName(java.lang.String name)
                             throws javax.servlet.ServletException

Retrieve Decorator based on name specified in configuration file.

Throws:

javax.servlet.ServletException

getMappedName

public java.lang.String getMappedName(java.lang.String path)
                               throws javax.servlet.ServletException

Get name of Decorator mapped to given path.

Throws:

javax.servlet.ServletException

loadConfig

private void loadConfig()
                 throws javax.servlet.ServletException

Load configuration from file.

Throws:

javax.servlet.ServletException

parseConfig

private void parseConfig(org.w3c.dom.Document document)

Parse configuration from XML document.

populatePathMapper

private void populatePathMapper(org.w3c.dom.NodeList patternNodes,
                      java.lang.String role,
                      java.lang.String name)

Extracts each URL pattern and adds it to the pathMapper map.

getAttribute

private static java.lang.String getAttribute(org.w3c.dom.Element element,
                            java.lang.String name)

Override default behavior of element.getAttribute (returns the empty string) to return null.

getContainedText

private static java.lang.String getContainedText(org.w3c.dom.Node parent,
                                java.lang.String childTagName)

With a given parent XML Element, find the text contents of the child element with supplied name.

storeDecorator

private void storeDecorator(Decorator d)

Store Decorator in Map

refresh

private void refresh()
              throws javax.servlet.ServletException

Check if configuration file has been updated, and if so, reload.

Throws:

javax.servlet.ServletException