001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.rest.server.arg;
018
019import org.apache.juneau.commons.reflect.*;
020import org.apache.juneau.marshall.parser.*;
021import org.apache.juneau.rest.server.*;
022import org.apache.juneau.rest.server.httppart.*;
023
024/**
025 * Resolves method parameters of type {@link Parser} on {@link RestOp}-annotated Java methods.
026 *
027 * <p>
028 * The parameter value is resolved using:
029 * <p class='bjava'>
030 *    <jv>opSession</jv>
031 *       .{@link RestOpSession#getRequest() getRequest}()
032 *       .{@link RestRequest#getContent() getContent}()
033 *       .{@link RequestContent#getParserMatch() getParserMatch}()
034 *       .{@link ParserMatch#getParser() getParser}();
035 * </p>
036 *
037 * <h5 class='section'>See Also:</h5><ul>
038 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JavaMethodParameters">Java Method Parameters</a>
039 * </ul>
040 */
041public class ParserArg extends SimpleRestOperationArg {
042
043   /**
044    * Static creator.
045    *
046    * @param paramInfo The Java method parameter being resolved. Must not be <jk>null</jk>.
047    * @return A new {@link ParserArg}, or <jk>null</jk> if the parameter type is not {@link Parser}.
048    */
049   public static ParserArg create(ParameterInfo paramInfo) {
050      if (paramInfo.isType(Parser.class))
051         return new ParserArg();
052      return null;
053   }
054
055   /**
056    * Constructor.
057    */
058   protected ParserArg() {
059      super(opSession -> opSession.getRequest().getContent().getParserMatch().map(ParserMatch::getParser).orElse(null));
060   }
061}