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package org.apache.tomcat.util.digester;
import java.util.List;
/**
* <p><code>AbstractRuleImpl</code> provides basic services for <code>Rules</code> implementations.
* Extending this class should make it easier to create a <code>Rules</code> implementation.</p>
*
* <p><code>AbstractRuleImpl</code> manages the <code>Digester</code>
* and <code>namespaceUri</code> properties.
* If the subclass overrides {@link #registerRule} (rather than {@link #add}),
* then the <code>Digester</code> and <code>namespaceURI</code> of the <code>Rule</code>
* will be set correctly before it is passed to <code>registerRule</code>.
* The subclass can then perform whatever it needs to do to register the rule.</p>
*
* @since 1.5
*/
abstract public class AbstractRulesImpl implements Rules {
// ------------------------------------------------------------- Fields
/** Digester using this <code>Rules</code> implementation */
private Digester digester;
/** Namespace uri to assoicate with subsequent <code>Rule</code>'s */
private String namespaceURI;
// ------------------------------------------------------------- Properties
/**
* Return the Digester instance with which this Rules instance is
* associated.
*/
public Digester getDigester() {
return digester;
}
/**
* Set the Digester instance with which this Rules instance is associated.
*
* @param digester The newly associated Digester instance
*/
public void setDigester(Digester digester) {
this.digester = digester;
}
/**
* Return the namespace URI that will be applied to all subsequently
* added <code>Rule</code> objects.
*/
public String getNamespaceURI() {
return namespaceURI;
}
/**
* Set the namespace URI that will be applied to all subsequently
* added <code>Rule</code> objects.
*
* @param namespaceURI Namespace URI that must match on all
* subsequently added rules, or <code>null</code> for matching
* regardless of the current namespace URI
*/
public void setNamespaceURI(String namespaceURI) {
this.namespaceURI = namespaceURI;
}
// --------------------------------------------------------- Public Methods
/**
* Registers a new Rule instance matching the specified pattern.
* This implementation sets the <code>Digester</code> and the
* <code>namespaceURI</code> on the <code>Rule</code> before calling {@link #registerRule}.
*
* @param pattern Nesting pattern to be matched for this Rule
* @param rule Rule instance to be registered
*/
public void add(String pattern, Rule rule) {
// set up rule
if (this.digester != null) {
rule.setDigester(this.digester);
}
if (this.namespaceURI != null) {
rule.setNamespaceURI(this.namespaceURI);
}
registerRule(pattern, rule);
}
/**
* Register rule at given pattern.
* The the Digester and namespaceURI properties of the given <code>Rule</code>
* can be assumed to have been set properly before this method is called.
*
* @param pattern Nesting pattern to be matched for this Rule
* @param rule Rule instance to be registered
*/
abstract protected void registerRule(String pattern, Rule rule);
/**
* Clear all existing Rule instance registrations.
*/
abstract public void clear();
/**
* 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 <strong>must</strong> be returned
* in the order originally registered through the <code>add()</code>
* method.
*
* @param namespaceURI Namespace URI for which to select matching rules,
* or <code>null</code> to match regardless of namespace URI
* @param pattern Nesting pattern to be matched
*/
abstract public List<Rule> match(String namespaceURI, String pattern);
/**
* 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 <strong>must</strong> be returned
* in the order originally registered through the <code>add()</code>
* method.
*/
abstract public List<Rule> rules();
}