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Tools to assist in the reading of configuration/preferences files in various formats

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/*
 * 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.configuration2.resolver;

import java.net.URL;
import java.util.Map;

/**
 * Interface used for registering and retrieving PUBLICID to URL mappings.
 *
 * @since 1.7
 */
public interface EntityRegistry {
    /**
     * Gets a map with the entity IDs that have been registered using the {@code registerEntityId()} method.
     *
     * @return a map with the registered entity IDs
     */
    Map getRegisteredEntities();

    /**
     * 
     * Registers the specified URL for the specified public identifier.
     * 
     * 
     * This implementation maps {@code PUBLICID}'s to URLs (from which the resource will be loaded). A common use case for
     * this method is to register local URLs (possibly computed at runtime by a class loader) for DTDs and Schemas. This
     * allows the performance advantage of using a local version without having to ensure every {@code SYSTEM} URI on every
     * processed XML document is local. This implementation provides only basic functionality. If more sophisticated
     * features are required, either calling {@code XMLConfiguration.setDocumentBuilder(DocumentBuilder)} to set a custom
     * {@code DocumentBuilder} (which also can be initialized with a custom {@code EntityResolver}) or creating a custom
     * entity resolver and registering it with the XMLConfiguration is recommended.
     * 
     *
     * @param publicId Public identifier of the Entity to be resolved
     * @param entityURL The URL to use for reading this Entity
     * @throws IllegalArgumentException if the public ID is undefined
     */
    void registerEntityId(String publicId, URL entityURL);
}