org.apache.commons.digester3.plugins.strategies
Class FinderFromFile

java.lang.Object
  org.apache.commons.digester3.plugins.RuleFinder
      org.apache.commons.digester3.plugins.strategies.FinderFromFile

public class FinderFromFile
extends RuleFinder

A rule-finding algorithm which expects the user to specify an absolute or relative path in the plugin declaration.

The file is expected to contain Digester rules in xmlrules format.

Since:

1.6

Constructor Summary

FinderFromFile()
See findLoader(org.apache.commons.digester3.Digester, java.lang.Class, java.util.Properties).

FinderFromFile(String filenameAttr)
See findLoader(org.apache.commons.digester3.Digester, java.lang.Class, java.util.Properties).

Method Summary

RuleLoader

findLoader(Digester d, Class<?> pluginClass, Properties p) If there exists a property with the name specified in the constructor, then load that file, run it through the xmlrules module and return an object encapsulating those rules.

Methods inherited from class java.lang.Object

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

Constructor Detail

FinderFromFile

public FinderFromFile()

See findLoader(org.apache.commons.digester3.Digester, java.lang.Class, java.util.Properties).

FinderFromFile

public FinderFromFile(String filenameAttr)

See findLoader(org.apache.commons.digester3.Digester, java.lang.Class, java.util.Properties).

Parameters:

filenameAttr - the XML attribute that needs to be present on a plugin declaration in order to specify the file to load rules from.

Method Detail

findLoader

public RuleLoader findLoader(Digester d,
                             Class<?> pluginClass,
                             Properties p)
                      throws PluginException

If there exists a property with the name specified in the constructor, then load that file, run it through the xmlrules module and return an object encapsulating those rules.

If there is no matching property provided, then just return null.

The returned object (when non-null) will add the selected rules to the digester whenever its addRules method is invoked.

Specified by:

findLoader in class RuleFinder

Parameters:

d - The digester instance where locating plugin classes

pluginClass - The plugin Java class

p - The properties object that holds any xml attributes the user may have specified on the plugin declaration in order to indicate how to locate the plugin rules.

Returns:

a source of digester rules for the specified plugin class.

Throws:

PluginException - if the algorithm finds a source of rules, but there is something invalid about that source.