/*
 * 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.sling.superimposing;

import java.util.Iterator;

import org.apache.sling.superimposing.impl.SuperimposingResourceProviderImpl;

/**
 * Manages the resource registrations for the {@link SuperimposingResourceProviderImpl}.
 * Provides read-only access to all registered providers.
 */
public interface SuperimposingManager {

    /**
     * @return true if superimposing mode is enabled.
     */
    boolean isEnabled();

    /**
     * @return Iterator with all superimposing resource providers currently registered.
     *   Iterator is backed by a {@link java.util.concurrent.ConcurrentHashMap} and is safe to access
     *   even if superimposing resource providers are registered or unregistered at the same time.
     */
    Iterator<SuperimposingResourceProvider> getRegisteredProviders();

}