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JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.

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package net.minidev.json.writer;

/*
 *    Copyright 2011-2023 JSON-SMART authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import net.minidev.json.JSONArray;
import net.minidev.json.JSONAware;
import net.minidev.json.JSONAwareEx;
import net.minidev.json.JSONObject;

public class JsonReader {
	private final ConcurrentHashMap> cache;

	public JsonReaderI DEFAULT;
	public JsonReaderI DEFAULT_ORDERED;

	public JsonReader() {
		cache = new ConcurrentHashMap>(100);

		cache.put(Date.class, BeansMapper.MAPPER_DATE);

		cache.put(int[].class, ArraysMapper.MAPPER_PRIM_INT);
		cache.put(Integer[].class, ArraysMapper.MAPPER_INT);

		cache.put(short[].class, ArraysMapper.MAPPER_PRIM_INT);
		cache.put(Short[].class, ArraysMapper.MAPPER_INT);

		cache.put(long[].class, ArraysMapper.MAPPER_PRIM_LONG);
		cache.put(Long[].class, ArraysMapper.MAPPER_LONG);

		cache.put(byte[].class, ArraysMapper.MAPPER_PRIM_BYTE);
		cache.put(Byte[].class, ArraysMapper.MAPPER_BYTE);

		cache.put(char[].class, ArraysMapper.MAPPER_PRIM_CHAR);
		cache.put(Character[].class, ArraysMapper.MAPPER_CHAR);

		cache.put(float[].class, ArraysMapper.MAPPER_PRIM_FLOAT);
		cache.put(Float[].class, ArraysMapper.MAPPER_FLOAT);

		cache.put(double[].class, ArraysMapper.MAPPER_PRIM_DOUBLE);
		cache.put(Double[].class, ArraysMapper.MAPPER_DOUBLE);

		cache.put(boolean[].class, ArraysMapper.MAPPER_PRIM_BOOL);
		cache.put(Boolean[].class, ArraysMapper.MAPPER_BOOL);

		this.DEFAULT = new DefaultMapper(this);
		this.DEFAULT_ORDERED = new DefaultMapperOrdered(this);

		cache.put(JSONAwareEx.class, this.DEFAULT);
		cache.put(JSONAware.class, this.DEFAULT);
		cache.put(JSONArray.class, this.DEFAULT);
		cache.put(JSONObject.class, this.DEFAULT);
	}

	/**
	 * remap field name in custom classes
	 * 
	 * @param fromJson
	 *            field name in json
	 * @param toJava
	 *            field name in Java
	 * @since 2.1.1
	 */
	public  void remapField(Class type, String fromJson, String toJava) {
		JsonReaderI map = this.getMapper(type);
		if (!(map instanceof MapperRemapped)) {
			map = new MapperRemapped(map);
			registerReader(type, map);
		}
		((MapperRemapped) map).renameField(fromJson, toJava);
	}

	public  void registerReader(Class type, JsonReaderI mapper) {
		cache.put(type, mapper);
	}

	@SuppressWarnings("unchecked")
	public  JsonReaderI getMapper(Type type) {
		if (type instanceof ParameterizedType)
			return getMapper((ParameterizedType) type);
		return getMapper((Class) type);
	}

	/**
	 * Get the corresponding mapper Class, or create it on first call
	 * 
	 * @param type
	 *            to be map
	 */
	public  JsonReaderI getMapper(Class type) {
		// look for cached Mapper
		@SuppressWarnings("unchecked")
		JsonReaderI map = (JsonReaderI) cache.get(type);
		if (map != null)
			return map;
		/*
		 * Special handle
		 */
		if (type instanceof Class) {
			if (Map.class.isAssignableFrom(type))
				map = new DefaultMapperCollection(this, type);
			else if (List.class.isAssignableFrom(type))
				map = new DefaultMapperCollection(this, type);
			if (map != null) {
				cache.put(type, map);
				return map;
			}
		}

		if (type.isArray())
			map = new ArraysMapper.GenericMapper(this, type);
		else if (List.class.isAssignableFrom(type))
			map = new CollectionMapper.ListClass(this, type);
		else if (Map.class.isAssignableFrom(type))
			map = new CollectionMapper.MapClass(this, type);
		else
			// use bean class
			map = new BeansMapper.Bean(this, type);
		cache.putIfAbsent(type, map);
		return map;
	}

	@SuppressWarnings("unchecked")
	public  JsonReaderI getMapper(ParameterizedType type) {
		JsonReaderI map = (JsonReaderI) cache.get(type);
		if (map != null)
			return map;
		Class clz = (Class) type.getRawType();
		if (List.class.isAssignableFrom(clz))
			map = new CollectionMapper.ListType(this, type);
		else if (Map.class.isAssignableFrom(clz))
			map = new CollectionMapper.MapType(this, type);
		cache.putIfAbsent(type, map);
		return map;
	}
}