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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 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.Array;
import java.util.ArrayList;
import java.util.List;

public class ArraysMapper extends JsonReaderI {
	public ArraysMapper(JsonReader base) {
		super(base);
	}

	@Override
	public Object createArray() {
		return new ArrayList();
	}

	@SuppressWarnings("unchecked")
	@Override
	public void addValue(Object current, Object value) {
		((List) current).add(value);
	}

	@SuppressWarnings("unchecked")
	@Override
	public T convert(Object current) {
		return (T) current;
	}

	public static class GenericMapper extends ArraysMapper {
		final Class componentType;
		JsonReaderI subMapper;

		public GenericMapper(JsonReader base, Class type) {
			super(base);
			this.componentType = type.getComponentType();
		}

		@SuppressWarnings("unchecked")
		@Override
		public T convert(Object current) {
			int p = 0;

			Object[] r = (Object[]) Array.newInstance(componentType, ((List) current).size());
			for (Object e : ((List) current))
				r[p++] = e;
			return (T) r;
		}

		@Override
		public JsonReaderI startArray(String key) {
			if (subMapper == null)
				subMapper = base.getMapper(componentType);
			return subMapper;
		}

		@Override
		public JsonReaderI startObject(String key) {
			if (subMapper == null)
				subMapper = base.getMapper(componentType);
			return subMapper;
		}
	};

	public static JsonReaderI MAPPER_PRIM_INT = new ArraysMapper(null) {
		@Override
		public int[] convert(Object current) {
			int p = 0;
			int[] r = new int[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = ((Number) e).intValue();
			return r;
		}
	};

	public static JsonReaderI MAPPER_INT = new ArraysMapper(null) {
		@Override
		public Integer[] convert(Object current) {
			int p = 0;
			Integer[] r = new Integer[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				if (e instanceof Integer)
					r[p] = (Integer) e;
				else
					r[p] = ((Number) e).intValue();
				p++;
			}
			return r;
		}
	};

	public static JsonReaderI MAPPER_PRIM_SHORT = new ArraysMapper(null) {
		@Override
		public short[] convert(Object current) {
			int p = 0;
			short[] r = new short[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = ((Number) e).shortValue();
			return r;
		}
	};

	public static JsonReaderI MAPPER_SHORT = new ArraysMapper(null) {
		@Override
		public Short[] convert(Object current) {
			int p = 0;
			Short[] r = new Short[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				if (e instanceof Short)
					r[p] = (Short) e;
				else
					r[p] = ((Number) e).shortValue();
				p++;
			}
			return r;
		}
	};

	public static JsonReaderI MAPPER_PRIM_BYTE = new ArraysMapper(null) {
		@Override
		public byte[] convert(Object current) {
			int p = 0;
			byte[] r = new byte[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = ((Number) e).byteValue();
			return r;
		}
	};

	public static JsonReaderI MAPPER_BYTE = new ArraysMapper(null) {
		@Override
		public Byte[] convert(Object current) {
			int p = 0;
			Byte[] r = new Byte[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				if (e instanceof Byte)
					r[p] = (Byte) e;
				else
					r[p] = ((Number) e).byteValue();
				p++;
			}
			return r;
		}
	};

	public static JsonReaderI MAPPER_PRIM_CHAR = new ArraysMapper(null) {
		@Override
		public char[] convert(Object current) {
			int p = 0;
			char[] r = new char[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = e.toString().charAt(0);
			return r;
		}
	};

	public static JsonReaderI MAPPER_CHAR = new ArraysMapper(null) {
		@Override
		public Character[] convert(Object current) {
			int p = 0;
			Character[] r = new Character[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				r[p] = e.toString().charAt(0);
				p++;
			}
			return r;
		}
	};

	public static JsonReaderI MAPPER_PRIM_LONG = new ArraysMapper(null) {
		@Override
		public long[] convert(Object current) {
			int p = 0;
			long[] r = new long[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = ((Number) e).intValue();
			return r;
		}
	};

	public static JsonReaderI MAPPER_LONG = new ArraysMapper(null) {
		@Override
		public Long[] convert(Object current) {
			int p = 0;
			Long[] r = new Long[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				if (e instanceof Float)
					r[p] = ((Long) e);
				else
					r[p] = ((Number) e).longValue();
				p++;
			}
			return r;
		}
	};

	public static JsonReaderI MAPPER_PRIM_FLOAT = new ArraysMapper(null) {
		@Override
		public float[] convert(Object current) {
			int p = 0;
			float[] r = new float[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = ((Number) e).floatValue();
			return r;
		}
	};

	public static JsonReaderI MAPPER_FLOAT = new ArraysMapper(null) {
		@Override
		public Float[] convert(Object current) {
			int p = 0;
			Float[] r = new Float[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				if (e instanceof Float)
					r[p] = ((Float) e);
				else
					r[p] = ((Number) e).floatValue();
				p++;
			}
			return r;
		}
	};

	public static JsonReaderI MAPPER_PRIM_DOUBLE = new ArraysMapper(null) {
		@Override
		public double[] convert(Object current) {
			int p = 0;
			double[] r = new double[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = ((Number) e).doubleValue();
			return r;
		}
	};

	public static JsonReaderI MAPPER_DOUBLE = new ArraysMapper(null) {
		@Override
		public Double[] convert(Object current) {
			int p = 0;
			Double[] r = new Double[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				if (e instanceof Double)
					r[p] = ((Double) e);
				else
					r[p] = ((Number) e).doubleValue();
				p++;
			}
			return r;
		}
	};

	public static JsonReaderI MAPPER_PRIM_BOOL = new ArraysMapper(null) {
		@Override
		public boolean[] convert(Object current) {
			int p = 0;
			boolean[] r = new boolean[((List) current).size()];
			for (Object e : ((List) current))
				r[p++] = ((Boolean) e).booleanValue();
			return r;
		}
	};

	public static JsonReaderI MAPPER_BOOL = new ArraysMapper(null) {
		@Override
		public Boolean[] convert(Object current) {
			int p = 0;
			Boolean[] r = new Boolean[((List) current).size()];
			for (Object e : ((List) current)) {
				if (e == null)
					continue;
				if (e instanceof Boolean)
					r[p] = ((Boolean) e).booleanValue();
				else if (e instanceof Number)
					r[p] = ((Number) e).intValue() != 0;
				else
					throw new RuntimeException("can not convert " + e + " toBoolean");
				p++;
			}
			return r;
		}
	};
}
 















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