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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.mapper;

/*
 *    Copyright 2011 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.Type;
import java.util.HashMap;

import net.minidev.asm.Accessor;
import net.minidev.asm.BeansAccess;
import net.minidev.json.JSONUtil;

@SuppressWarnings("unchecked")
public abstract class BeansMapper extends AMapper {

	public abstract Object getValue(Object current, String key);

	public static class Bean extends AMapper {
		final Class clz;
		final BeansAccess ba;
		final HashMap index;

		public Bean(Class clz) {
			this.clz = clz;
			this.ba = BeansAccess.get(clz, JSONUtil.JSON_SMART_FIELD_FILTER);
			this.index = ba.getMap();
		}

		@Override
		public void setValue(Object current, String key, Object value) {
			ba.set((T) current, key, value);
			// Accessor nfo = index.get(key);
			// if (nfo == null)
			// throw new RuntimeException("Can not set " + key + " field in " +
			// clz);
			// value = JSONUtil.convertTo(value, nfo.getType());
			// ba.set((T) current, nfo.getIndex(), value);
		}

		public Object getValue(Object current, String key) {
			return ba.get((T) current, key);
			// Accessor nfo = index.get(key);
			// if (nfo == null)
			// throw new RuntimeException("Can not set " + key + " field in " +
			// clz);
			// return ba.get((T) current, nfo.getIndex());
		}

		@Override
		public Type getType(String key) {
			Accessor nfo = index.get(key);
			return nfo.getGenericType();
		}

		@Override
		public AMapper startArray(String key) {
			Accessor nfo = index.get(key);
			if (nfo == null)
				throw new RuntimeException("Can not set " + key + " field in " + clz);
			return Mapper.getMapper(nfo.getGenericType());
		}

		@Override
		public AMapper startObject(String key) {
			Accessor f = index.get(key);
			if (f == null)
				throw new RuntimeException("Can not set " + key + " field in " + clz);
			return Mapper.getMapper(f.getGenericType());
		}

		@Override
		public Object createObject() {
			return ba.newInstance();
		}
	}

	public static class BeanNoConv extends AMapper {
		final Class clz;
		final BeansAccess ba;
		final HashMap index;

		public BeanNoConv(Class clz) {
			this.clz = clz;
			this.ba = BeansAccess.get(clz, JSONUtil.JSON_SMART_FIELD_FILTER);
			this.index = ba.getMap();
		}

		@Override
		public void setValue(Object current, String key, Object value) {
			ba.set((T) current, key, value);
		}

		public Object getValue(Object current, String key) {
			return ba.get((T) current, key);
		}

		@Override
		public Type getType(String key) {
			Accessor nfo = index.get(key);
			return nfo.getGenericType();
		}

		@Override
		public AMapper startArray(String key) {
			Accessor nfo = index.get(key);
			if (nfo == null)
				throw new RuntimeException("Can not set " + key + " field in " + clz);
			return Mapper.getMapper(nfo.getGenericType());
		}

		@Override
		public AMapper startObject(String key) {
			Accessor f = index.get(key);
			if (f == null)
				throw new RuntimeException("Can not set " + key + " field in " + clz);
			return Mapper.getMapper(f.getGenericType());
		}

		@Override
		public Object createObject() {
			return ba.newInstance();
		}
	}

}