001// ***************************************************************************************************************************
002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
003// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
005// * with the License.  You may obtain a copy of the License at                                                              *
006// *                                                                                                                         *
007// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
008// *                                                                                                                         *
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011// * specific language governing permissions and limitations under the License.                                              *
012// ***************************************************************************************************************************
013package org.apache.juneau.rest.vars;
014
015import org.apache.juneau.rest.*;
016import org.apache.juneau.svl.*;
017
018/**
019 * Request path variable resolver.
020 * 
021 * <p>
022 * The format for this var is <js>"$RP{key1[,key2...]}"</js>.
023 * 
024 * <p>
025 * Used to resolve values returned by {@link RestRequest#getPath(String)}.
026 * <br>When multiple keys are used, returns the first non-null/empty value.
027 * 
028 * <h5 class='section'>Example:</h5>
029 * <p class='bcode'>
030 *    <jc>// URI path pattern = "/foo/{foo}/bar/{bar}"</jc>
031 *    String foo = restRequest.resolveVars(<js>"$RP{foo}"</js>); 
032 *    String fooOrBar = restRequest.resolveVars(<js>"$RP{foo,bar}"</js>); 
033 * </p>
034 * 
035 * <h5 class='section'>Notes:</h5>
036 * <ul class='spaced-list'>
037 *    <li>
038 *       This variable resolver requires that a {@link RestRequest} object be set as a context object on the resolver 
039 *       or a session object on the resolver session.
040 *    <li>
041 *       For security reasons, nested and recursive variables are not resolved.
042 * </ul>
043 * 
044 * <h5 class='section'>See Also:</h5>
045 * <ul>
046 *    <li class='link'><a class="doclink" href="../../../../../overview-summary.html#juneau-rest-server.SvlVariables">Overview &gt; juneau-rest-server &gt; SVL Variables</a>
047 * </ul>
048 */
049public class RequestPathVar extends MultipartResolvingVar {
050
051   /**
052    * The name of the session or context object that identifies the {@link RestRequest} object.
053    */
054   public static final String SESSION_req = "req";
055
056
057   /** The name of this variable. */
058   public static final String NAME = "RP";
059
060   /**
061    * Constructor.
062    */
063   public RequestPathVar() {
064      super(NAME);
065   }
066   
067   @Override /* Var */
068   protected boolean allowNested() {
069      return false;
070   }
071
072   @Override /* Var */
073   protected boolean allowRecurse() {
074      return false;
075   }
076
077   @Override /* Parameter */
078   public String resolve(VarResolverSession session, String key) {
079      RestRequest req = session.getSessionObject(RestRequest.class, SESSION_req);
080      return req.getPath(key);
081   }
082}