001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.lib.wsrs; 019 020import org.apache.hadoop.classification.InterfaceAudience; 021 022import com.google.common.collect.Lists; 023 024import java.util.List; 025import java.util.Map; 026 027/** 028 * Class that contains all parsed JAX-RS parameters. 029 * <p/> 030 * Instances are created by the {@link ParametersProvider} class. 031 */ 032@InterfaceAudience.Private 033public class Parameters { 034 private Map<String, List<Param<?>>> params; 035 036 /** 037 * Constructor that receives the request parsed parameters. 038 * 039 * @param params the request parsed parameters. 040 */ 041 public Parameters(Map<String, List<Param<?>>> params) { 042 this.params = params; 043 } 044 045 /** 046 * Returns the value of a request parsed parameter. 047 * 048 * @param name parameter name. 049 * @param klass class of the parameter, used for value casting. 050 * @return the value of the parameter. 051 */ 052 @SuppressWarnings("unchecked") 053 public <V, T extends Param<V>> V get(String name, Class<T> klass) { 054 List<Param<?>> multiParams = (List<Param<?>>)params.get(name); 055 if (multiParams != null && multiParams.size() > 0) { 056 return ((T) multiParams.get(0)).value(); // Return first value; 057 } 058 return null; 059 } 060 061 /** 062 * Returns the values of a request parsed parameter. 063 * 064 * @param name parameter name. 065 * @param klass class of the parameter, used for value casting. 066 * @return List<V> the values of the parameter. 067 */ 068 @SuppressWarnings("unchecked") 069 public <V, T extends Param<V>> List<V> getValues(String name, Class<T> klass) { 070 List<Param<?>> multiParams = (List<Param<?>>)params.get(name); 071 List<V> values = Lists.newArrayList(); 072 if (multiParams != null) { 073 for (Param<?> param : multiParams) { 074 V value = ((T) param).value(); 075 if (value != null) { 076 values.add(value); 077 } 078 } 079 } 080 return values; 081 } 082}