Class RulesBase

java.lang.Object

org.apache.commons.digester3.AbstractRulesImpl

org.apache.commons.digester3.RulesBase

All Implemented Interfaces:

Rules

Direct Known Subclasses:

ExtendedBaseRules

public class RulesBase
extends AbstractRulesImpl

Default implementation of the Rules interface that supports the standard rule matching behavior. This class can also be used as a base class for specialized Rules implementations.

The matching policies implemented by this class support two different types of pattern matching rules:

• Exact Match - A pattern "a/b/c" exactly matches a <c> element, nested inside a <b> element, which is nested inside an <a> element.
• Tail Match - A pattern "*/a/b" matches a <b> element, nested inside an <a> element, no matter how deeply the pair is nested.

Note that wildcard patterns are ignored if an explicit match can be found (and when multiple wildcard patterns match, only the longest, ie most explicit, pattern is considered a match).

See the package documentation for package org.apache.commons.digester3 for more information.

Field Summary

Fields

Modifier and Type	Field	Description
protected HashMap<String, List<Rule>>	cache	The set of registered Rule instances, keyed by the matching pattern.
protected ArrayList<Rule>	rules	The set of registered Rule instances, in the order that they were originally registered.

Constructor Summary

Constructors

Constructor	Description
RulesBase()

Method Summary

Modifier and Type	Method	Description
void	clear()	Clear all existing Rule instance registrations.
protected List<Rule>	lookup(String namespaceURI, String pattern)	Return a List of Rule instances for the specified pattern that also match the specified namespace URI (if any).
List<Rule>	match(String namespaceURI, String pattern, String name, Attributes attributes)	Return a List of all registered Rule instances that match the specified nesting pattern, or a zero-length List if there are no matches.
protected void	registerRule(String pattern, Rule rule)	Register rule at given pattern.
List<Rule>	rules()	Return a List of all registered Rule instances, or a zero-length List if there are no registered Rule instances.
void	setDigester(Digester digester)	Set the Digester instance with which this Rules instance is associated.

Methods inherited from class AbstractRulesImpl

add, getDigester, getNamespaceURI, setNamespaceURI

Methods inherited from class Object

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

Field Details

cache

protected HashMap<String, List<Rule>> cache

The set of registered Rule instances, keyed by the matching pattern. Each value is a List containing the Rules for that pattern, in the order that they were orginally registered.

rules

protected ArrayList<Rule> rules

The set of registered Rule instances, in the order that they were originally registered.

Constructor Details

RulesBase

public RulesBase()

Method Details

setDigester

public void setDigester(Digester digester)

Set the Digester instance with which this Rules instance is associated.

Specified by:

setDigester in interface Rules

Overrides:

setDigester in class AbstractRulesImpl

Parameters:

digester - The newly associated Digester instance

registerRule

protected void registerRule(String pattern,
 Rule rule)

Register rule at given pattern. The the Digester and namespaceURI properties of the given Rule can be assumed to have been set properly before this method is called.

Specified by:

registerRule in class AbstractRulesImpl

Parameters:

pattern - Nesting pattern to be matched for this Rule

rule - Rule instance to be registered

clear

public void clear()

Clear all existing Rule instance registrations.

match

public List<Rule> match(String namespaceURI,
 String pattern,
 String name,
 Attributes attributes)

Return a List of all registered Rule instances that match the specified nesting pattern, or a zero-length List if there are no matches. If more than one Rule instance matches, they must be returned in the order originally registered through the add() method.

Parameters:

namespaceURI - Namespace URI for which to select matching rules, or null to match regardless of namespace URI

pattern - Nesting pattern to be matched

name - the local name if the parser is namespace aware, or just the element name otherwise

attributes - The attribute list of the current matching element

Returns:

a List of all registered Rule instances that match the specified nesting pattern

rules

public List<Rule> rules()

Return a List of all registered Rule instances, or a zero-length List if there are no registered Rule instances. If more than one Rule instance has been registered, they must be returned in the order originally registered through the add() method.

Returns:

a List of all registered Rule instances

lookup

protected List<Rule> lookup(String namespaceURI,
 String pattern)

Return a List of Rule instances for the specified pattern that also match the specified namespace URI (if any). If there are no such rules, return null.

Parameters:

namespaceURI - Namespace URI to match, or null to select matching rules regardless of namespace URI

pattern - Pattern to be matched

Returns:

a List of Rule instances for the specified pattern that also match the specified namespace URI (if any)