/*
 * 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.servlets.annotations;

import org.apache.sling.api.servlets.ServletResolverConstants;
import org.osgi.service.component.annotations.ComponentPropertyType;
/**
 * The prefix/index to be used to register this servlet.
 * Must be used in combination with either {@link SlingServletPaths} or {@link SlingServletResourceTypes}.
 * It only is applied as prefix to {@link SlingServletPaths} or {@link SlingServletResourceTypes#resourceTypes()} 
 * in case they do not start with a "/".
 *
 * @see <a href="https://sling.apache.org/documentation/the-sling-engine/servlets.html">Sling Servlets</a>
 * @see ServletResolverConstants
 * @see <a href="https://github.com/apache/felix/blob/trunk/tools/org.apache.felix.scr.annotations/src/main/java/org/apache/felix/scr/annotations/sling/SlingServlet.java">Felix SCR annotation</a>
 */
@ComponentPropertyType
public @interface SlingServletPrefix {

    /**
     * <ul>
     * <li>If the value of this element is a number, it defines the index of the search
     * path entries from the resource resolver. The defined search path is used as
     * a prefix to mount this servlet. The number can be -1 which always points to the
     * last search entry. If the specified value is higher than than the highest index
     * of the search paths, the last entry is used. The index starts with 0.
     * If the value of this property is a string and parseable as a number, the above
     * logic is used.</li>
     * <li>If the value of this element is a string starting with "/", this value is applied
     * as a prefix, regardless of the configured search paths!</li>
     * <li>If the value is anything else, it is ignored.</li>
     * </ul>
     * If this property is empty, the configuration of the {@code org.apache.sling.servlets.resolver.internal.SlingServletResolver}
     * service is used.
     * In case even that one is not set "/" is used as prefix.
     * @return the prefix
     * @see ServletResolverConstants#SLING_SERVLET_PREFIX
     */
    String value();
}