001/* 002 * oauth2-oidc-sdk 003 * 004 * Copyright 2012-2016, Connect2id Ltd and contributors. 005 * 006 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use 007 * this file except in compliance with the License. You may obtain a copy of the 008 * 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 distributed 013 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 014 * CONDITIONS OF ANY KIND, either express or implied. See the License for the 015 * specific language governing permissions and limitations under the License. 016 */ 017 018package com.nimbusds.oauth2.sdk.util; 019 020 021import java.net.URI; 022import java.net.URISyntaxException; 023import java.util.ArrayList; 024import java.util.Collections; 025import java.util.List; 026 027import com.nimbusds.oauth2.sdk.ParseException; 028import net.minidev.json.JSONArray; 029 030 031/** 032 * JSON array helper methods for parsing and typed retrieval of values. 033 */ 034public final class JSONArrayUtils { 035 036 037 /** 038 * Parses a JSON array. 039 * 040 * <p>Specific JSON to Java entity mapping (as per JSON Simple): 041 * 042 * <ul> 043 * <li>JSON numbers mapped to {@code java.lang.Number}. 044 * <li>JSON integer numbers mapped to {@code long}. 045 * <li>JSON fraction numbers mapped to {@code double}. 046 * </ul> 047 * 048 * @param s The JSON array string to parse. Must not be {@code null}. 049 * 050 * @return The JSON array. 051 * 052 * @throws ParseException If the string cannot be parsed to a JSON 053 * array. 054 */ 055 public static JSONArray parse(final String s) 056 throws ParseException { 057 058 Object o = JSONUtils.parseJSON(s); 059 060 if (o instanceof JSONArray) 061 return (JSONArray)o; 062 else 063 throw new ParseException("The JSON entity is not an array"); 064 } 065 066 067 /** 068 * Converts the specified JSON array to a string list. 069 * 070 * @param jsonArray The JSON array. May be {@code null}. 071 * 072 * @return The corresponding string list, empty list if the JSON array 073 * is {@code null} or empty. 074 */ 075 public static List<String> toStringList(final JSONArray jsonArray) { 076 077 if (CollectionUtils.isEmpty(jsonArray)) { 078 return Collections.emptyList(); 079 } 080 081 List<String> stringList = new ArrayList<>(jsonArray.size()); 082 083 for (Object o: jsonArray) { 084 085 if (o == null) { 086 continue; // skip 087 } 088 089 stringList.add(o.toString()); 090 } 091 092 return stringList; 093 } 094 095 096 /** 097 * Converts the specified JSON array to a URI list. 098 * 099 * @param jsonArray The JSON array. May be {@code null}. 100 * 101 * @return The corresponding URI list, empty list if the JSON array is 102 * {@code null} or empty. 103 * 104 * @throws ParseException If a JSON array item couldn't be parsed to a 105 * URI. 106 */ 107 public static List<URI> toURIList(final JSONArray jsonArray) 108 throws ParseException { 109 110 if (CollectionUtils.isEmpty(jsonArray)) { 111 return Collections.emptyList(); 112 } 113 114 List<URI> uriList = new ArrayList<>(jsonArray.size()); 115 116 for (Object o: jsonArray) { 117 118 if (o == null) { 119 continue; // skip 120 } 121 122 try { 123 uriList.add(new URI(o.toString())); 124 } catch (URISyntaxException e) { 125 throw new ParseException("Illegal URI: " + e.getMessage(), e); 126 } 127 } 128 129 return uriList; 130 } 131 132 133 /** 134 * Prevents public instantiation. 135 */ 136 private JSONArrayUtils() {} 137}