org.apache.tomcat.util.digester

Class RulesBase

java.lang.Object

org.apache.tomcat.util.digester.RulesBase

All Implemented Interfaces:

Rules

public class RulesBase
extends Object
implements Rules

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.

Field Summary

Fields

Modifier and Type	Field and Description
protected HashMap<String,List<Rule>>	cache The set of registered Rule instances, keyed by the matching pattern.
protected Digester	digester The Digester instance with which this Rules instance is associated.
protected String	namespaceURI The namespace URI for which subsequently added Rule objects are relevant, or null for matching independent of namespaces.
protected ArrayList<Rule>	rules The set of registered Rule instances, in the order that they were originally registered.

Constructor Summary

Constructors

Constructor and Description
RulesBase()

Method Summary

Modifier and Type	Method and Description
void	add(String pattern, Rule rule) Register a new Rule instance matching the specified pattern.
void	clear() Clear all existing Rule instance registrations.
Digester	getDigester() Return the Digester instance with which this Rules instance is associated.
String	getNamespaceURI() Return the namespace URI that will be applied to all subsequently added Rule objects.
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) Return a List of all registered Rule instances that match the specified nesting pattern, or a zero-length List if there are no matches.
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.
void	setNamespaceURI(String namespaceURI) Set the namespace URI that will be applied to all subsequently added Rule objects.

Methods inherited from class java.lang.Object

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

Field Detail

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 originally registered.

digester

protected Digester digester

The Digester instance with which this Rules instance is associated.

namespaceURI

protected String namespaceURI

The namespace URI for which subsequently added Rule objects are relevant, or null for matching independent of namespaces.

rules

protected ArrayList<Rule> rules

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

Constructor Detail

RulesBase

public RulesBase()

Method Detail

getDigester

public Digester getDigester()

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

Specified by:

getDigester in interface Rules

Returns:

the Digester instance with which this Rules instance is associated.

setDigester

public void setDigester(Digester digester)

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

Specified by:

setDigester in interface Rules

Parameters:

digester - The newly associated Digester instance

getNamespaceURI

public String getNamespaceURI()

Return the namespace URI that will be applied to all subsequently added Rule objects.

Specified by:

getNamespaceURI in interface Rules

Returns:

the namespace URI that will be applied to all subsequently added Rule objects.

setNamespaceURI

public void setNamespaceURI(String namespaceURI)

Set the namespace URI that will be applied to all subsequently added Rule objects.

Specified by:

setNamespaceURI in interface Rules

Parameters:

namespaceURI - Namespace URI that must match on all subsequently added rules, or null for matching regardless of the current namespace URI

add

public void add(String pattern,
                Rule rule)

Register a new Rule instance matching the specified pattern.

Specified by:

add in interface Rules

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.

Specified by:

clear in interface Rules

match

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

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.

Specified by:

match in interface Rules

Parameters:

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

pattern - Nesting pattern to be matched

Returns:

a rules list

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.

Specified by:

rules in interface Rules

Returns:

a rules list

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 rules list