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/* $Id: Rules.java 729086 2008-12-23 20:18:22Z rahul $
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 


package org.apache.commons.digester;


import java.util.List;


/**
 * Public interface defining a collection of Rule instances (and corresponding
 * matching patterns) plus an implementation of a matching policy that selects
 * the rules that match a particular pattern of nested elements discovered
 * during parsing.
 */

public interface Rules {


    // ------------------------------------------------------------- Properties


    /**
     * Return the Digester instance with which this Rules instance is
     * associated.
     */
    public Digester getDigester();


    /**
     * Set the Digester instance with which this Rules instance is associated.
     *
     * @param digester The newly associated Digester instance
     */
    public void setDigester(Digester digester);


    /**
     * Return the namespace URI that will be applied to all subsequently
     * added Rule objects.
     */
    public String getNamespaceURI();


    /**
     * Set the namespace URI that will be applied to all subsequently
     * added Rule objects.
     *
     * @param namespaceURI Namespace URI that must match on all
     *  subsequently added rules, or null for matching
     *  regardless of the current namespace URI
     */
    public void setNamespaceURI(String namespaceURI);


    // --------------------------------------------------------- Public Methods


    /**
     * Register a new Rule instance matching the specified pattern.
     *
     * @param pattern Nesting pattern to be matched for this Rule
     * @param rule Rule instance to be registered
     */
    public void add(String pattern, Rule rule);


    /**
     * Clear all existing Rule instance registrations.
     */
    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 must be returned
     * in the order originally registered through the add()
     * method.
     *
     * @param pattern Nesting pattern to be matched
     *
     * @deprecated Call match(namespaceURI,pattern) instead.
     */
    public List match(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.
     *
     * @param namespaceURI Namespace URI for which to select matching rules,
     *  or null to match regardless of namespace URI
     * @param pattern Nesting pattern to be matched
     */
    public List 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 must be returned
     * in the order originally registered through the add()
     * method.
     */
    public List rules();


}