001/* 002 * Copyright 2012-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.json; 018 019import java.util.List; 020import java.util.Map; 021import java.util.concurrent.Callable; 022import java.util.function.Function; 023 024import org.springframework.util.ReflectionUtils; 025 026/** 027 * Base class for parsers wrapped or implemented in this package. 028 * 029 * @author Anton Telechev 030 * @author Phillip Webb 031 * @since 2.0.1 032 */ 033public abstract class AbstractJsonParser implements JsonParser { 034 035 protected final Map<String, Object> parseMap(String json, 036 Function<String, Map<String, Object>> parser) { 037 return trimParse(json, "{", parser); 038 } 039 040 protected final List<Object> parseList(String json, 041 Function<String, List<Object>> parser) { 042 return trimParse(json, "[", parser); 043 } 044 045 protected final <T> T trimParse(String json, String prefix, 046 Function<String, T> parser) { 047 String trimmed = (json != null) ? json.trim() : ""; 048 if (trimmed.startsWith(prefix)) { 049 return parser.apply(trimmed); 050 } 051 throw new JsonParseException(); 052 } 053 054 protected final <T> T tryParse(Callable<T> parser, Class<? extends Exception> check) { 055 try { 056 return parser.call(); 057 } 058 catch (Exception ex) { 059 if (check.isAssignableFrom(ex.getClass())) { 060 throw new JsonParseException(ex); 061 } 062 ReflectionUtils.rethrowRuntimeException(ex); 063 throw new IllegalStateException(ex); 064 } 065 } 066 067}