PlotSquared/PlotSquared/src/main/java/com/intellectualcrafters/json/JSONArray.java

////////////////////////////////////////////////////////////////////////////////////////////////////
// PlotSquared - A plot manager and world generator for the Bukkit API                             /
// Copyright (c) 2014 IntellectualSites/IntellectualCrafters                                       /
//                                                                                                 /
// This program is free software; you can redistribute it and/or modify                            /
// it under the terms of the GNU General Public License as published by                            /
// the Free Software Foundation; either version 3 of the License, or                               /
// (at your option) any later version.                                                             /
//                                                                                                 /
// This program is distributed in the hope that it will be useful,                                 /
// but WITHOUT ANY WARRANTY; without even the implied warranty of                                  /
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                   /
// GNU General Public License for more details.                                                    /
//                                                                                                 /
// You should have received a copy of the GNU General Public License                               /
// along with this program; if not, write to the Free Software Foundation,                         /
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA                               /
//                                                                                                 /
// You can contact us via: support@intellectualsites.com                                           /
////////////////////////////////////////////////////////////////////////////////////////////////////

package com.intellectualcrafters.json;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;

/**
 * A JSONArray is an ordered sequence of values. Its external text form is a
 * string wrapped in square brackets with commas separating the values. The
 * internal form is an object having <code>get</code> and <code>opt</code>
 * methods for accessing the values by index, and <code>put</code> methods for
 * adding or replacing values. The values can be any of these types:
 * <code>Boolean</code>, <code>JSONArray</code>, <code>JSONObject</code>,
 * <code>Number</code>, <code>String</code>, or the
 * <code>JSONObject.NULL object</code>.
 * <p/>
 * The constructor can convert a JSON text into a Java object. The
 * <code>toString</code> method converts to JSON text.
 * <p/>
 * A <code>get</code> method returns a value if one can be found, and throws an
 * exception if one cannot be found. An <code>opt</code> method returns a
 * default value instead of throwing an exception, and so is useful for
 * obtaining optional values.
 * <p/>
 * The generic <code>get()</code> and <code>opt()</code> methods return an
 * object which you can cast or query for type. There are also typed
 * <code>get</code> and <code>opt</code> methods that do type checking and type
 * coercion for you.
 * <p/>
 * The texts produced by the <code>toString</code> methods strictly conform to
 * JSON syntax rules. The constructors are more forgiving in the texts they will
 * accept:
 * <ul>
 * <li>An extra <code>,</code>&nbsp;<small>(comma)</small> may appear just
 * before the closing bracket.</li>
 * <li>The <code>null</code> value will be inserted when there is <code>,</code>
 * &nbsp;<small>(comma)</small> elision.</li>
 * <li>Strings may be quoted with <code>'</code>&nbsp;<small>(single
 * quote)</small>.</li>
 * <li>Strings do not need to be quoted at all if they do not begin with a quote
 * or single quote, and if they do not contain leading or trailing spaces, and
 * if they do not contain any of these characters:
 * <code>{ } [ ] / \ : , #</code> and if they do not look like numbers and if
 * they are not the reserved words <code>true</code>, <code>false</code>, or
 * <code>null</code>.</li>
 * </ul>
 *
 * @author JSON.org
 * @version 2014-05-03
 */
public class JSONArray {

    /**
     * The arrayList where the JSONArray's properties are kept.
     */
    private final ArrayList<Object> myArrayList;

    /**
     * Construct an empty JSONArray.
     */
    public JSONArray() {
        this.myArrayList = new ArrayList<Object>();
    }

    /**
     * Construct a JSONArray from a JSONTokener.
     *
     * @param x
     *            A JSONTokener
     * @throws JSONException
     *             If there is a syntax error.
     */
    public JSONArray(final JSONTokener x) throws JSONException {
        this();
        if (x.nextClean() != '[') {
            throw x.syntaxError("A JSONArray text must start with '['");
        }
        if (x.nextClean() != ']') {
            x.back();
            for (;;) {
                if (x.nextClean() == ',') {
                    x.back();
                    this.myArrayList.add(JSONObject.NULL);
                }
                else {
                    x.back();
                    this.myArrayList.add(x.nextValue());
                }
                switch (x.nextClean()) {
                    case ',':
                        if (x.nextClean() == ']') {
                            return;
                        }
                        x.back();
                        break;
                    case ']':
                        return;
                    default:
                        throw x.syntaxError("Expected a ',' or ']'");
                }
            }
        }
    }

    /**
     * Construct a JSONArray from a source JSON text.
     *
     * @param source
     *            A string that begins with <code>[</code>&nbsp;<small>(left
     *            bracket)</small> and ends with <code>]</code>
     *            &nbsp;<small>(right bracket)</small>.
     * @throws JSONException
     *             If there is a syntax error.
     */
    public JSONArray(final String source) throws JSONException {
        this(new JSONTokener(source));
    }

    /**
     * Construct a JSONArray from a Collection.
     *
     * @param collection
     *            A Collection.
     */
    public JSONArray(final Collection<Object> collection) {
        this.myArrayList = new ArrayList<Object>();
        if (collection != null) {
            for (final Object aCollection : collection) {
                this.myArrayList.add(JSONObject.wrap(aCollection));
            }
        }
    }

    /**
     * Construct a JSONArray from an array
     *
     * @throws JSONException
     *             If not an array.
     */
    public JSONArray(final Object array) throws JSONException {
        this();
        if (array.getClass().isArray()) {
            final int length = Array.getLength(array);
            for (int i = 0; i < length; i += 1) {
                this.put(JSONObject.wrap(Array.get(array, i)));
            }
        }
        else {
            throw new JSONException("JSONArray initial value should be a string or collection or array.");
        }
    }

    /**
     * Get the object value associated with an index.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return An object value.
     * @throws JSONException
     *             If there is no value for the index.
     */
    public Object get(final int index) throws JSONException {
        final Object object = this.opt(index);
        if (object == null) {
            throw new JSONException("JSONArray[" + index + "] not found.");
        }
        return object;
    }

    /**
     * Get the boolean value associated with an index. The string values "true"
     * and "false" are converted to boolean.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The truth.
     * @throws JSONException
     *             If there is no value for the index or if the value is not
     *             convertible to boolean.
     */
    public boolean getBoolean(final int index) throws JSONException {
        final Object object = this.get(index);
        if (object.equals(Boolean.FALSE) || ((object instanceof String) && ((String) object).equalsIgnoreCase("false"))) {
            return false;
        }
        else if (object.equals(Boolean.TRUE) || ((object instanceof String) && ((String) object).equalsIgnoreCase("true"))) {
            return true;
        }
        throw new JSONException("JSONArray[" + index + "] is not a boolean.");
    }

    /**
     * Get the double value associated with an index.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The value.
     * @throws JSONException
     *             If the key is not found or if the value cannot be converted
     *             to a number.
     */
    public double getDouble(final int index) throws JSONException {
        final Object object = this.get(index);
        try {
            return object instanceof Number ? ((Number) object).doubleValue() : Double.parseDouble((String) object);
        }
        catch (final Exception e) {
            throw new JSONException("JSONArray[" + index + "] is not a number.");
        }
    }

    /**
     * Get the int value associated with an index.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The value.
     * @throws JSONException
     *             If the key is not found or if the value is not a number.
     */
    public int getInt(final int index) throws JSONException {
        final Object object = this.get(index);
        try {
            return object instanceof Number ? ((Number) object).intValue() : Integer.parseInt((String) object);
        }
        catch (final Exception e) {
            throw new JSONException("JSONArray[" + index + "] is not a number.");
        }
    }

    /**
     * Get the JSONArray associated with an index.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return A JSONArray value.
     * @throws JSONException
     *             If there is no value for the index. or if the value is not a
     *             JSONArray
     */
    public JSONArray getJSONArray(final int index) throws JSONException {
        final Object object = this.get(index);
        if (object instanceof JSONArray) {
            return (JSONArray) object;
        }
        throw new JSONException("JSONArray[" + index + "] is not a JSONArray.");
    }

    /**
     * Get the JSONObject associated with an index.
     *
     * @param index
     *            subscript
     * @return A JSONObject value.
     * @throws JSONException
     *             If there is no value for the index or if the value is not a
     *             JSONObject
     */
    public JSONObject getJSONObject(final int index) throws JSONException {
        final Object object = this.get(index);
        if (object instanceof JSONObject) {
            return (JSONObject) object;
        }
        throw new JSONException("JSONArray[" + index + "] is not a JSONObject.");
    }

    /**
     * Get the long value associated with an index.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The value.
     * @throws JSONException
     *             If the key is not found or if the value cannot be converted
     *             to a number.
     */
    public long getLong(final int index) throws JSONException {
        final Object object = this.get(index);
        try {
            return object instanceof Number ? ((Number) object).longValue() : Long.parseLong((String) object);
        }
        catch (final Exception e) {
            throw new JSONException("JSONArray[" + index + "] is not a number.");
        }
    }

    /**
     * Get the string associated with an index.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return A string value.
     * @throws JSONException
     *             If there is no string value for the index.
     */
    public String getString(final int index) throws JSONException {
        final Object object = this.get(index);
        if (object instanceof String) {
            return (String) object;
        }
        throw new JSONException("JSONArray[" + index + "] not a string.");
    }

    /**
     * Determine if the value is null.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return true if the value at the index is null, or if there is no value.
     */
    public boolean isNull(final int index) {
        return JSONObject.NULL.equals(this.opt(index));
    }

    /**
     * Make a string from the contents of this JSONArray. The
     * <code>separator</code> string is inserted between each element. Warning:
     * This method assumes that the data structure is acyclical.
     *
     * @param separator
     *            A string that will be inserted between the elements.
     * @return a string.
     * @throws JSONException
     *             If the array contains an invalid number.
     */
    public String join(final String separator) throws JSONException {
        final int len = this.length();
        final StringBuilder sb = new StringBuilder();

        for (int i = 0; i < len; i += 1) {
            if (i > 0) {
                sb.append(separator);
            }
            sb.append(JSONObject.valueToString(this.myArrayList.get(i)));
        }
        return sb.toString();
    }

    /**
     * Get the number of elements in the JSONArray, included nulls.
     *
     * @return The length (or size).
     */
    public int length() {
        return this.myArrayList.size();
    }

    /**
     * Get the optional object value associated with an index.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return An object value, or null if there is no object at that index.
     */
    public Object opt(final int index) {
        return ((index < 0) || (index >= this.length())) ? null : this.myArrayList.get(index);
    }

    /**
     * Get the optional boolean value associated with an index. It returns false
     * if there is no value at that index, or if the value is not Boolean.TRUE
     * or the String "true".
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The truth.
     */
    public boolean optBoolean(final int index) {
        return this.optBoolean(index, false);
    }

    /**
     * Get the optional boolean value associated with an index. It returns the
     * defaultValue if there is no value at that index or if it is not a Boolean
     * or the String "true" or "false" (case insensitive).
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @param defaultValue
     *            A boolean default.
     * @return The truth.
     */
    public boolean optBoolean(final int index, final boolean defaultValue) {
        try {
            return this.getBoolean(index);
        }
        catch (final Exception e) {
            return defaultValue;
        }
    }

    /**
     * Get the optional double value associated with an index. NaN is returned
     * if there is no value for the index, or if the value is not a number and
     * cannot be converted to a number.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The value.
     */
    public double optDouble(final int index) {
        return this.optDouble(index, Double.NaN);
    }

    /**
     * Get the optional double value associated with an index. The defaultValue
     * is returned if there is no value for the index, or if the value is not a
     * number and cannot be converted to a number.
     *
     * @param index
     *            subscript
     * @param defaultValue
     *            The default value.
     * @return The value.
     */
    public double optDouble(final int index, final double defaultValue) {
        try {
            return this.getDouble(index);
        }
        catch (final Exception e) {
            return defaultValue;
        }
    }

    /**
     * Get the optional int value associated with an index. Zero is returned if
     * there is no value for the index, or if the value is not a number and
     * cannot be converted to a number.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The value.
     */
    public int optInt(final int index) {
        return this.optInt(index, 0);
    }

    /**
     * Get the optional int value associated with an index. The defaultValue is
     * returned if there is no value for the index, or if the value is not a
     * number and cannot be converted to a number.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @param defaultValue
     *            The default value.
     * @return The value.
     */
    public int optInt(final int index, final int defaultValue) {
        try {
            return this.getInt(index);
        }
        catch (final Exception e) {
            return defaultValue;
        }
    }

    /**
     * Get the optional JSONArray associated with an index.
     *
     * @param index
     *            subscript
     * @return A JSONArray value, or null if the index has no value, or if the
     *         value is not a JSONArray.
     */
    public JSONArray optJSONArray(final int index) {
        final Object o = this.opt(index);
        return o instanceof JSONArray ? (JSONArray) o : null;
    }

    /**
     * Get the optional JSONObject associated with an index. Null is returned if
     * the key is not found, or null if the index has no value, or if the value
     * is not a JSONObject.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return A JSONObject value.
     */
    public JSONObject optJSONObject(final int index) {
        final Object o = this.opt(index);
        return o instanceof JSONObject ? (JSONObject) o : null;
    }

    /**
     * Get the optional long value associated with an index. Zero is returned if
     * there is no value for the index, or if the value is not a number and
     * cannot be converted to a number.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return The value.
     */
    public long optLong(final int index) {
        return this.optLong(index, 0);
    }

    /**
     * Get the optional long value associated with an index. The defaultValue is
     * returned if there is no value for the index, or if the value is not a
     * number and cannot be converted to a number.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @param defaultValue
     *            The default value.
     * @return The value.
     */
    public long optLong(final int index, final long defaultValue) {
        try {
            return this.getLong(index);
        }
        catch (final Exception e) {
            return defaultValue;
        }
    }

    /**
     * Get the optional string value associated with an index. It returns an
     * empty string if there is no value at that index. If the value is not a
     * string and is not null, then it is coverted to a string.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @return A String value.
     */
    public String optString(final int index) {
        return this.optString(index, "");
    }

    /**
     * Get the optional string associated with an index. The defaultValue is
     * returned if the key is not found.
     *
     * @param index
     *            The index must be between 0 and length() - 1.
     * @param defaultValue
     *            The default value.
     * @return A String value.
     */
    public String optString(final int index, final String defaultValue) {
        final Object object = this.opt(index);
        return JSONObject.NULL.equals(object) ? defaultValue : object.toString();
    }

    /**
     * Append a boolean value. This increases the array's length by one.
     *
     * @param value
     *            A boolean value.
     * @return this.
     */
    public JSONArray put(final boolean value) {
        this.put(value ? Boolean.TRUE : Boolean.FALSE);
        return this;
    }

    /**
     * Put a value in the JSONArray, where the value will be a JSONArray which
     * is produced from a Collection.
     *
     * @param value
     *            A Collection value.
     * @return this.
     */
    public JSONArray put(final Collection<Object> value) {
        this.put(new JSONArray(value));
        return this;
    }

    /**
     * Append a double value. This increases the array's length by one.
     *
     * @param value
     *            A double value.
     * @return this.
     * @throws JSONException
     *             if the value is not finite.
     */
    public JSONArray put(final double value) throws JSONException {
        final Double d = value;
        JSONObject.testValidity(d);
        this.put(d);
        return this;
    }

    /**
     * Append an int value. This increases the array's length by one.
     *
     * @param value
     *            An int value.
     * @return this.
     */
    public JSONArray put(final int value) {
        this.put(new Integer(value));
        return this;
    }

    /**
     * Append an long value. This increases the array's length by one.
     *
     * @param value
     *            A long value.
     * @return this.
     */
    public JSONArray put(final long value) {
        this.put(new Long(value));
        return this;
    }

    /**
     * Put a value in the JSONArray, where the value will be a JSONObject which
     * is produced from a Map.
     *
     * @param value
     *            A Map value.
     * @return this.
     */
    public JSONArray put(final Map<String, Object> value) {
        this.put(new JSONObject(value));
        return this;
    }

    /**
     * Append an object value. This increases the array's length by one.
     *
     * @param value
     *            An object value. The value should be a Boolean, Double,
     *            Integer, JSONArray, JSONObject, Long, or String, or the
     *            JSONObject.NULL object.
     * @return this.
     */
    public JSONArray put(final Object value) {
        this.myArrayList.add(value);
        return this;
    }

    /**
     * Put or replace a boolean value in the JSONArray. If the index is greater
     * than the length of the JSONArray, then null elements will be added as
     * necessary to pad it out.
     *
     * @param index
     *            The subscript.
     * @param value
     *            A boolean value.
     * @return this.
     * @throws JSONException
     *             If the index is negative.
     */
    public JSONArray put(final int index, final boolean value) throws JSONException {
        this.put(index, value ? Boolean.TRUE : Boolean.FALSE);
        return this;
    }

    /**
     * Put a value in the JSONArray, where the value will be a JSONArray which
     * is produced from a Collection.
     *
     * @param index
     *            The subscript.
     * @param value
     *            A Collection value.
     * @return this.
     * @throws JSONException
     *             If the index is negative or if the value is not finite.
     */
    public JSONArray put(final int index, final Collection<Object> value) throws JSONException {
        this.put(index, new JSONArray(value));
        return this;
    }

    /**
     * Put or replace a double value. If the index is greater than the length of
     * the JSONArray, then null elements will be added as necessary to pad it
     * out.
     *
     * @param index
     *            The subscript.
     * @param value
     *            A double value.
     * @return this.
     * @throws JSONException
     *             If the index is negative or if the value is not finite.
     */
    public JSONArray put(final int index, final double value) throws JSONException {
        this.put(index, new Double(value));
        return this;
    }

    /**
     * Put or replace an int value. If the index is greater than the length of
     * the JSONArray, then null elements will be added as necessary to pad it
     * out.
     *
     * @param index
     *            The subscript.
     * @param value
     *            An int value.
     * @return this.
     * @throws JSONException
     *             If the index is negative.
     */
    public JSONArray put(final int index, final int value) throws JSONException {
        this.put(index, new Integer(value));
        return this;
    }

    /**
     * Put or replace a long value. If the index is greater than the length of
     * the JSONArray, then null elements will be added as necessary to pad it
     * out.
     *
     * @param index
     *            The subscript.
     * @param value
     *            A long value.
     * @return this.
     * @throws JSONException
     *             If the index is negative.
     */
    public JSONArray put(final int index, final long value) throws JSONException {
        this.put(index, new Long(value));
        return this;
    }

    /**
     * Put a value in the JSONArray, where the value will be a JSONObject that
     * is produced from a Map.
     *
     * @param index
     *            The subscript.
     * @param value
     *            The Map value.
     * @return this.
     * @throws JSONException
     *             If the index is negative or if the the value is an invalid
     *             number.
     */
    public JSONArray put(final int index, final Map<String, Object> value) throws JSONException {
        this.put(index, new JSONObject(value));
        return this;
    }

    /**
     * Put or replace an object value in the JSONArray. If the index is greater
     * than the length of the JSONArray, then null elements will be added as
     * necessary to pad it out.
     *
     * @param index
     *            The subscript.
     * @param value
     *            The value to put into the array. The value should be a
     *            Boolean, Double, Integer, JSONArray, JSONObject, Long, or
     *            String, or the JSONObject.NULL object.
     * @return this.
     * @throws JSONException
     *             If the index is negative or if the the value is an invalid
     *             number.
     */
    public JSONArray put(final int index, final Object value) throws JSONException {
        JSONObject.testValidity(value);
        if (index < 0) {
            throw new JSONException("JSONArray[" + index + "] not found.");
        }
        if (index < this.length()) {
            this.myArrayList.set(index, value);
        }
        else {
            while (index != this.length()) {
                this.put(JSONObject.NULL);
            }
            this.put(value);
        }
        return this;
    }

    /**
     * Remove an index and close the hole.
     *
     * @param index
     *            The index of the element to be removed.
     * @return The value that was associated with the index, or null if there
     *         was no value.
     */
    public Object remove(final int index) {
        return (index >= 0) && (index < this.length()) ? this.myArrayList.remove(index) : null;
    }

    /**
     * Determine if two JSONArrays are similar.
     * They must contain similar sequences.
     *
     * @param other
     *            The other JSONArray
     * @return true if they are equal
     */
    public boolean similar(final Object other) {
        if (!(other instanceof JSONArray)) {
            return false;
        }
        final int len = this.length();
        if (len != ((JSONArray) other).length()) {
            return false;
        }
        for (int i = 0; i < len; i += 1) {
            final Object valueThis = this.get(i);
            final Object valueOther = ((JSONArray) other).get(i);
            if (valueThis instanceof JSONObject) {
                if (!((JSONObject) valueThis).similar(valueOther)) {
                    return false;
                }
            }
            else if (valueThis instanceof JSONArray) {
                if (!((JSONArray) valueThis).similar(valueOther)) {
                    return false;
                }
            }
            else if (!valueThis.equals(valueOther)) {
                return false;
            }
        }
        return true;
    }

    /**
     * Produce a JSONObject by combining a JSONArray of names with the values of
     * this JSONArray.
     *
     * @param names
     *            A JSONArray containing a list of key strings. These will be
     *            paired with the values.
     * @return A JSONObject, or null if there are no names or if this JSONArray
     *         has no values.
     * @throws JSONException
     *             If any of the names are null.
     */
    public JSONObject toJSONObject(final JSONArray names) throws JSONException {
        if ((names == null) || (names.length() == 0) || (this.length() == 0)) {
            return null;
        }
        final JSONObject jo = new JSONObject();
        for (int i = 0; i < names.length(); i += 1) {
            jo.put(names.getString(i), this.opt(i));
        }
        return jo;
    }

    /**
     * Make a JSON text of this JSONArray. For compactness, no unnecessary
     * whitespace is added. If it is not possible to produce a syntactically
     * correct JSON text then null will be returned instead. This could occur if
     * the array contains an invalid number.
     * <p/>
     * Warning: This method assumes that the data structure is acyclical.
     *
     * @return a printable, displayable, transmittable representation of the
     *         array.
     */
    @Override
    public String toString() {
        try {
            return this.toString(0);
        }
        catch (final Exception e) {
            return null;
        }
    }

    /**
     * Make a prettyprinted JSON text of this JSONArray. Warning: This method
     * assumes that the data structure is acyclical.
     *
     * @param indentFactor
     *            The number of spaces to add to each level of indentation.
     * @return a printable, displayable, transmittable representation of the
     *         object, beginning with <code>[</code>&nbsp;<small>(left
     *         bracket)</small> and ending with <code>]</code>
     *         &nbsp;<small>(right bracket)</small>.
     * @throws JSONException
     */
    public String toString(final int indentFactor) throws JSONException {
        final StringWriter sw = new StringWriter();
        synchronized (sw.getBuffer()) {
            return this.write(sw, indentFactor, 0).toString();
        }
    }

    /**
     * Write the contents of the JSONArray as JSON text to a writer. For
     * compactness, no whitespace is added.
     * <p/>
     * Warning: This method assumes that the data structure is acyclical.
     *
     * @return The writer.
     * @throws JSONException
     */
    public Writer write(final Writer writer) throws JSONException {
        return this.write(writer, 0, 0);
    }

    /**
     * Write the contents of the JSONArray as JSON text to a writer. For
     * compactness, no whitespace is added.
     * <p/>
     * Warning: This method assumes that the data structure is acyclical.
     *
     * @param indentFactor
     *            The number of spaces to add to each level of indentation.
     * @param indent
     *            The indention of the top level.
     * @return The writer.
     * @throws JSONException
     */
    Writer write(final Writer writer, final int indentFactor, final int indent) throws JSONException {
        try {
            boolean commanate = false;
            final int length = this.length();
            writer.write('[');

            if (length == 1) {
                JSONObject.writeValue(writer, this.myArrayList.get(0), indentFactor, indent);
            }
            else if (length != 0) {
                final int newindent = indent + indentFactor;

                for (int i = 0; i < length; i += 1) {
                    if (commanate) {
                        writer.write(',');
                    }
                    if (indentFactor > 0) {
                        writer.write('\n');
                    }
                    JSONObject.indent(writer, newindent);
                    JSONObject.writeValue(writer, this.myArrayList.get(i), indentFactor, newindent);
                    commanate = true;
                }
                if (indentFactor > 0) {
                    writer.write('\n');
                }
                JSONObject.indent(writer, indent);
            }
            writer.write(']');
            return writer;
        }
        catch (final IOException e) {
            throw new JSONException(e);
        }
    }
}