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.arg;
018
019import java.util.function.*;
020
021import org.apache.juneau.rest.*;
022import org.apache.juneau.utils.*;
023
024/**
025 * An implementation of a {@link RestOpArg} that takes in a {@link ThrowingFunction} for resolving a parameter value.
026 *
027 * <h5 class='section'>See Also:</h5><ul>
028 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JavaMethodParameters">Java Method Parameters</a>
029 * </ul>
030 */
031public class SimpleRestOperationArg implements RestOpArg {
032
033   private final Function<RestOpSession,Object> function;
034
035   /**
036    * Constructor.
037    *
038    * @param <T> The function return type.
039    * @param function The function to use to retrieve the parameter value from the {@link RestSession}.
040    */
041   @SuppressWarnings("unchecked")
042   protected <T> SimpleRestOperationArg(ThrowingFunction<RestOpSession,T> function) {
043      this.function = (Function<RestOpSession,Object>)function;
044   }
045
046   @Override /* RestOpArg */
047   public Object resolve(RestOpSession opSession) throws Exception {
048      return function.apply(opSession);
049   }
050}