path: root/src/org/json/simple/JSONArray.java

/*
 * $Id: JSONArray.java,v 1.1 2006/04/15 14:10:48 platform Exp $
 * Created on 2006-4-10
 */
package org.json.simple;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import rejava.io.StringWriter;
import rejava.io.Writer;

/**
 * A JSON array. JSONObject supports java.util.List interface.
 * 
 * @author FangYidong<fangyidong@yahoo.com.cn>
 */
public class JSONArray extends ArrayList<Object> implements JSONAware, JSONStreamAware {
	private static final long serialVersionUID = 3957988303675231981L;

	/**
	 * Constructs an empty JSONArray.
	 */
	public JSONArray() {
		super();
	}

	/**
	 * Constructs a JSONArray containing the elements of the specified
	 * collection, in the order they are returned by the collection's iterator.
	 * 
	 * @param c
	 *            the collection whose elements are to be placed into this
	 *            JSONArray
	 */
	public JSONArray(final Collection<?> c) {
		super(c);
	}

	/**
	 * Encode a list into JSON text and write it to out. If this list is also a
	 * JSONStreamAware or a JSONAware, JSONStreamAware and JSONAware specific
	 * behaviours will be ignored at this top level.
	 * 
	 * @see org.json.simple.JSONValue#writeJSONString(Object, Writer)
	 * 
	 * @param collection
	 * @param out
	 */
	public static void writeJSONString(final Collection<?> collection, final Writer out) throws IOException {
		if (collection == null) {
			out.write("null");
			return;
		}

		boolean first = true;
		final Iterator<?> iter = collection.iterator();

		out.write('[');
		while (iter.hasNext()) {
			if (first) {
				first = false;
			} else {
				out.write(',');
			}

			final Object value = iter.next();
			if (value == null) {
				out.write("null");
				continue;
			}

			JSONValue.writeJSONString(value, out);
		}
		out.write(']');
	}

	@Override
	public void writeJSONString(final Writer out) throws IOException {
		JSONArray.writeJSONString(this, out);
	}

	/**
	 * Convert a list to JSON text. The result is a JSON array. If this list is
	 * also a JSONAware, JSONAware specific behaviours will be omitted at this
	 * top level.
	 * 
	 * @see org.json.simple.JSONValue#toJSONString(Object)
	 * 
	 * @param collection
	 * @return JSON text, or "null" if list is null.
	 */
	public static String toJSONString(final Collection<?> collection) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(collection, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final byte[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				out.write(String.valueOf(array[i]));
			}

			out.write("]");
		}
	}

	public static String toJSONString(final byte[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final short[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				out.write(String.valueOf(array[i]));
			}

			out.write("]");
		}
	}

	public static String toJSONString(final short[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final int[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				out.write(String.valueOf(array[i]));
			}

			out.write("]");
		}
	}

	public static String toJSONString(final int[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final long[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				out.write(String.valueOf(array[i]));
			}

			out.write("]");
		}
	}

	public static String toJSONString(final long[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final float[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				out.write(String.valueOf(array[i]));
			}

			out.write("]");
		}
	}

	public static String toJSONString(final float[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final double[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				out.write(String.valueOf(array[i]));
			}

			out.write("]");
		}
	}

	public static String toJSONString(final double[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final boolean[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				out.write(String.valueOf(array[i]));
			}

			out.write("]");
		}
	}

	public static String toJSONString(final boolean[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final char[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[\"");
			out.write(String.valueOf(array[0]));

			for (int i = 1; i < array.length; i++) {
				out.write("\",\"");
				out.write(String.valueOf(array[i]));
			}

			out.write("\"]");
		}
	}

	public static String toJSONString(final char[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	public static void writeJSONString(final Object[] array, final Writer out) throws IOException {
		if (array == null) {
			out.write("null");
		} else if (array.length == 0) {
			out.write("[]");
		} else {
			out.write("[");
			JSONValue.writeJSONString(array[0], out);

			for (int i = 1; i < array.length; i++) {
				out.write(",");
				JSONValue.writeJSONString(array[i], out);
			}

			out.write("]");
		}
	}

	public static String toJSONString(final Object[] array) {
		final StringWriter writer = new StringWriter();

		try {
			JSONArray.writeJSONString(array, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	@Override
	public String toJSONString() {
		return JSONArray.toJSONString(this);
	}

	/**
	 * Returns a string representation of this array. This is equivalent to
	 * calling {@link JSONArray#toJSONString()}.
	 */
	@Override
	public String toString() {
		return this.toJSONString();
	}
}