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// *                                                                                                                         *
009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an  *
010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the        *
011// * specific language governing permissions and limitations under the License.                                              *
012// ***************************************************************************************************************************
013package org.apache.juneau.rest.arg;
014
015import java.util.function.*;
016
017import org.apache.juneau.rest.*;
018import org.apache.juneau.utils.*;
019
020/**
021 * An implementation of a {@link RestOpArg} that takes in a {@link ThrowingFunction} for resolving a parameter value.
022 *
023 * <h5 class='section'>See Also:</h5><ul>
024 *    <li class='link'><a class="doclink" href="../../../../../index.html#jrs.JavaMethodParameters">Java Method Parameters</a>
025 * </ul>
026 */
027public class SimpleRestOperationArg implements RestOpArg {
028
029   private final Function<RestOpSession,Object> function;
030
031   /**
032    * Constructor.
033    *
034    * @param <T> The function return type.
035    * @param function The function to use to retrieve the parameter value from the {@link RestSession}.
036    */
037   @SuppressWarnings("unchecked")
038   protected <T> SimpleRestOperationArg(ThrowingFunction<RestOpSession,T> function) {
039      this.function = (Function<RestOpSession,Object>)function;
040   }
041
042   @Override /* RestOpArg */
043   public Object resolve(RestOpSession opSession) throws Exception {
044      return function.apply(opSession);
045   }
046}