JsonReader.java

package net.minidev.json.writer;

/*
 *    Copyright 2011-2024 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<Type, JsonReaderI<?>> cache;

  public JsonReaderI<JSONAwareEx> DEFAULT;
  public JsonReaderI<JSONAwareEx> DEFAULT_ORDERED;

  public JsonReader() {
    cache = new ConcurrentHashMap<Type, JsonReaderI<?>>(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<JSONAwareEx>(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 <T> void remapField(Class<T> type, String fromJson, String toJava) {
    JsonReaderI<T> map = this.getMapper(type);
    if (!(map instanceof MapperRemapped)) {
      map = new MapperRemapped<T>(map);
      registerReader(type, map);
    }
    ((MapperRemapped<T>) map).renameField(fromJson, toJava);
  }

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

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

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

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

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