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JSONObject.java
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2266 lines (2064 loc) · 66.7 KB
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package processing.data;
// This code has been modified heavily to more closely match the rest of the
// Processing API. In the spirit of the rest of the project, where we try to
// keep the API as simple as possible, we have erred on the side of being
// conservative in choosing which functions to include, since we haven't yet
// decided what's truly necessary. Power users looking for a full-featured
// version can use the original version from json.org, or one of the many
// other APIs that are available. As with all Processing API, if there's a
// function that should be added, please let use know, and have others vote:
// http://code.google.com/p/processing/issues/list
/*
Copyright (c) 2002 JSON.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
The Software shall be used for Good, not Evil.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import processing.core.PApplet;
/**
* A JSONObject is an unordered collection of name/value pairs. Its external
* form is a string wrapped in curly braces with colons between the names and
* values, and commas between the values and names. The internal form is an
* object having <code>get</code> and <code>opt</code> methods for accessing the
* values by name, and <code>put</code> methods for adding or replacing values
* by name. 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</code> object. A JSONObject
* constructor can be used to convert an external form JSON text into an
* internal form whose values can be retrieved with the <code>get</code> and
* <code>opt</code> methods, or to convert values into a JSON text using the
* <code>put</code> and <code>toString</code> methods. 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. The opt methods differ from the get methods in that they do
* not throw. Instead, they return a specified value, such as null.
* <p>
* The <code>put</code> methods add or replace values in an object. For example,
*
* <pre>
* myString = new JSONObject().put("JSON", "Hello, World!").toString();
* </pre>
*
* produces the string <code>{"JSON": "Hello, World"}</code>.
* <p>
* The texts produced by the <code>toString</code> methods strictly conform to
* the JSON syntax rules. The constructors are more forgiving in the texts they
* will accept:
* <ul>
* <li>An extra <code>,</code> <small>(comma)</small> may appear just
* before the closing brace.</li>
* <li>Strings may be quoted with <code>'</code> <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>
* <li>Keys can be followed by <code>=</code> or <code>=></code> as well as by
* <code>:</code>.</li>
* <li>Values can be followed by <code>;</code> <small>(semicolon)</small> as
* well as by <code>,</code> <small>(comma)</small>.</li>
* </ul>
*
* @author JSON.org
* @version 2012-12-01
* @webref data:composite
* @see JSONArray
* @see PApplet#loadJSONObject(String)
* @see PApplet#loadJSONArray(String)
* @see PApplet#saveJSONObject(JSONObject, String)
* @see PApplet#saveJSONArray(JSONArray, String)
*/
public class JSONObject {
/**
* The maximum number of keys in the key pool.
*/
private static final int keyPoolSize = 100;
/**
* Key pooling is like string interning, but without permanently tying up
* memory. To help conserve memory, storage of duplicated key strings in
* JSONObjects will be avoided by using a key pool to manage unique key
* string objects. This is used by JSONObject.put(string, object).
*/
private static HashMap<String, Object> keyPool =
new HashMap<String, Object>(keyPoolSize);
// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
/**
* JSONObject.NULL is equivalent to the value that JavaScript calls null,
* whilst Java's null is equivalent to the value that JavaScript calls
* undefined.
*/
private static final class Null {
/**
* There is only intended to be a single instance of the NULL object,
* so the clone method returns itself.
* @return NULL.
*/
@Override
protected final Object clone() {
return this;
}
/**
* A Null object is equal to the null value and to itself.
* @param object An object to test for nullness.
* @return true if the object parameter is the JSONObject.NULL object
* or null.
*/
@Override
public boolean equals(Object object) {
return object == null || object == this;
}
/**
* Get the "null" string value.
* @return The string "null".
*/
@Override
public String toString() {
return "null";
}
@Override
public int hashCode() {
// TODO Auto-generated method stub
return super.hashCode();
}
}
// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
/**
* The map where the JSONObject's properties are kept.
*/
// private final Map map;
private final HashMap<String, Object> map;
/**
* It is sometimes more convenient and less ambiguous to have a
* <code>NULL</code> object than to use Java's <code>null</code> value.
* <code>JSONObject.NULL.equals(null)</code> returns <code>true</code>.
* <code>JSONObject.NULL.toString()</code> returns <code>"null"</code>.
*/
public static final Object NULL = new Null();
/**
* Construct an empty JSONObject.
* @nowebref
*/
public JSONObject() {
this.map = new HashMap<String, Object>();
}
// /**
// * Construct a JSONObject from a subset of another JSONObject.
// * An array of strings is used to identify the keys that should be copied.
// * Missing keys are ignored.
// * @param jo A JSONObject.
// * @param names An array of strings.
// * @throws JSONException
// * @exception JSONException If a value is a non-finite number or if a name is duplicated.
// */
// public JSONObject(JSONObject jo, String[] names) {
// this();
// for (int i = 0; i < names.length; i += 1) {
// try {
// this.putOnce(names[i], jo.opt(names[i]));
// } catch (Exception ignore) {
// }
// }
// }
/**
* @nowebref
*/
public JSONObject(Reader reader) {
this(new JSONTokener(reader));
}
/**
* Construct a JSONObject from a JSONTokener.
* @param x A JSONTokener object containing the source string.
* @throws JSONException If there is a syntax error in the source string
* or a duplicated key.
*/
protected JSONObject(JSONTokener x) {
this();
char c;
String key;
if (x.nextClean() != '{') {
throw new RuntimeException("A JSONObject text must begin with '{'");
}
for (;;) {
c = x.nextClean();
switch (c) {
case 0:
throw new RuntimeException("A JSONObject text must end with '}'");
case '}':
return;
default:
x.back();
key = x.nextValue().toString();
}
// The key is followed by ':'. We will also tolerate '=' or '=>'.
c = x.nextClean();
if (c == '=') {
if (x.next() != '>') {
x.back();
}
} else if (c != ':') {
throw new RuntimeException("Expected a ':' after a key");
}
this.putOnce(key, x.nextValue());
// Pairs are separated by ','. We will also tolerate ';'.
switch (x.nextClean()) {
case ';':
case ',':
if (x.nextClean() == '}') {
return;
}
x.back();
break;
case '}':
return;
default:
throw new RuntimeException("Expected a ',' or '}'");
}
}
}
/**
* Construct a JSONObject from a Map.
*
* @param map A map object that can be used to initialize the contents of
* the JSONObject.
* @throws JSONException
*/
protected JSONObject(HashMap<String, Object> map) {
this.map = new HashMap<String, Object>();
if (map != null) {
Iterator i = map.entrySet().iterator();
while (i.hasNext()) {
Map.Entry e = (Map.Entry) i.next();
Object value = e.getValue();
if (value != null) {
map.put((String) e.getKey(), wrap(value));
}
}
}
}
/**
* @nowebref
*/
public JSONObject(IntDict dict) {
map = new HashMap<String, Object>();
for (int i = 0; i < dict.size(); i++) {
setInt(dict.key(i), dict.value(i));
}
}
/**
* @nowebref
*/
public JSONObject(FloatDict dict) {
map = new HashMap<String, Object>();
for (int i = 0; i < dict.size(); i++) {
setFloat(dict.key(i), dict.value(i));
}
}
/**
* @nowebref
*/
public JSONObject(StringDict dict) {
map = new HashMap<String, Object>();
for (int i = 0; i < dict.size(); i++) {
setString(dict.key(i), dict.value(i));
}
}
/**
* Construct a JSONObject from an Object using bean getters.
* It reflects on all of the public methods of the object.
* For each of the methods with no parameters and a name starting
* with <code>"get"</code> or <code>"is"</code> followed by an uppercase letter,
* the method is invoked, and a key and the value returned from the getter method
* are put into the new JSONObject.
*
* The key is formed by removing the <code>"get"</code> or <code>"is"</code> prefix.
* If the second remaining character is not upper case, then the first
* character is converted to lower case.
*
* For example, if an object has a method named <code>"getName"</code>, and
* if the result of calling <code>object.getName()</code> is <code>"Larry Fine"</code>,
* then the JSONObject will contain <code>"name": "Larry Fine"</code>.
*
* @param bean An object that has getter methods that should be used
* to make a JSONObject.
*/
protected JSONObject(Object bean) {
this();
this.populateMap(bean);
}
// holding off on this method until we decide on how to handle reflection
// /**
// * Construct a JSONObject from an Object, using reflection to find the
// * public members. The resulting JSONObject's keys will be the strings
// * from the names array, and the values will be the field values associated
// * with those keys in the object. If a key is not found or not visible,
// * then it will not be copied into the new JSONObject.
// * @param object An object that has fields that should be used to make a
// * JSONObject.
// * @param names An array of strings, the names of the fields to be obtained
// * from the object.
// */
// public JSONObject(Object object, String names[]) {
// this();
// Class c = object.getClass();
// for (int i = 0; i < names.length; i += 1) {
// String name = names[i];
// try {
// this.putOpt(name, c.getField(name).get(object));
// } catch (Exception ignore) {
// }
// }
// }
/**
* Construct a JSONObject from a source JSON text string.
* This is the most commonly used JSONObject constructor.
* @param source A string beginning
* with <code>{</code> <small>(left brace)</small> and ending
* with <code>}</code> <small>(right brace)</small>.
* @exception JSONException If there is a syntax error in the source
* string or a duplicated key.
*/
static public JSONObject parse(String source) {
return new JSONObject(new JSONTokener(source));
}
// /**
// * Construct a JSONObject from a ResourceBundle.
// * @param baseName The ResourceBundle base name.
// * @param locale The Locale to load the ResourceBundle for.
// * @throws JSONException If any JSONExceptions are detected.
// */
// public JSON(String baseName, Locale locale) {
// this();
// ResourceBundle bundle = ResourceBundle.getBundle(baseName, locale,
// Thread.currentThread().getContextClassLoader());
//
// // Iterate through the keys in the bundle.
//
// Enumeration keys = bundle.getKeys();
// while (keys.hasMoreElements()) {
// Object key = keys.nextElement();
// if (key instanceof String) {
//
// // Go through the path, ensuring that there is a nested JSONObject for each
// // segment except the last. Add the value using the last segment's name into
// // the deepest nested JSONObject.
//
// String[] path = ((String)key).split("\\.");
// int last = path.length - 1;
// JSON target = this;
// for (int i = 0; i < last; i += 1) {
// String segment = path[i];
// JSON nextTarget = target.optJSONObject(segment);
// if (nextTarget == null) {
// nextTarget = new JSON();
// target.put(segment, nextTarget);
// }
// target = nextTarget;
// }
// target.put(path[last], bundle.getString((String)key));
// }
// }
// }
// /**
// * Accumulate values under a key. It is similar to the put method except
// * that if there is already an object stored under the key then a
// * JSONArray is stored under the key to hold all of the accumulated values.
// * If there is already a JSONArray, then the new value is appended to it.
// * In contrast, the put method replaces the previous value.
// *
// * If only one value is accumulated that is not a JSONArray, then the
// * result will be the same as using put. But if multiple values are
// * accumulated, then the result will be like append.
// * @param key A key string.
// * @param value An object to be accumulated under the key.
// * @return this.
// * @throws JSONException If the value is an invalid number
// * or if the key is null.
// */
// public JSONObject accumulate(
// String key,
// Object value
// ) throws JSONException {
// testValidity(value);
// Object object = this.opt(key);
// if (object == null) {
// this.put(key, value instanceof JSONArray
// ? new JSONArray().put(value)
// : value);
// } else if (object instanceof JSONArray) {
// ((JSONArray)object).put(value);
// } else {
// this.put(key, new JSONArray().put(object).put(value));
// }
// return this;
// }
// /**
// * Append values to the array under a key. If the key does not exist in the
// * JSONObject, then the key is put in the JSONObject with its value being a
// * JSONArray containing the value parameter. If the key was already
// * associated with a JSONArray, then the value parameter is appended to it.
// * @param key A key string.
// * @param value An object to be accumulated under the key.
// * @return this.
// * @throws JSONException If the key is null or if the current value
// * associated with the key is not a JSONArray.
// */
// public JSONObject append(String key, Object value) throws JSONException {
// testValidity(value);
// Object object = this.opt(key);
// if (object == null) {
// this.put(key, new JSONArray().put(value));
// } else if (object instanceof JSONArray) {
// this.put(key, ((JSONArray)object).put(value));
// } else {
// throw new JSONException("JSONObject[" + key +
// "] is not a JSONArray.");
// }
// return this;
// }
/**
* Produce a string from a double. The string "null" will be returned if
* the number is not finite.
* @param d A double.
* @return A String.
*/
static protected String doubleToString(double d) {
if (Double.isInfinite(d) || Double.isNaN(d)) {
return "null";
}
// Shave off trailing zeros and decimal point, if possible.
String string = Double.toString(d);
if (string.indexOf('.') > 0 && string.indexOf('e') < 0 &&
string.indexOf('E') < 0) {
while (string.endsWith("0")) {
string = string.substring(0, string.length() - 1);
}
if (string.endsWith(".")) {
string = string.substring(0, string.length() - 1);
}
}
return string;
}
/**
* Get the value object associated with a key.
*
* @param key A key string.
* @return The object associated with the key.
* @throws JSONException if the key is not found.
*/
private Object get(String key) {
if (key == null) {
throw new RuntimeException("Null key.");
}
Object object = this.opt(key);
if (object == null) {
throw new RuntimeException("JSONObject[" + quote(key) + "] not found.");
}
return object;
}
/**
* Gets the String associated with a key
*
* @webref jsonobject:method
* @brief Gets the string value associated with a key
* @param key a key string
* @return A string which is the value.
* @throws JSONException if there is no string value for the key.
* @see JSONObject#getInt(String)
* @see JSONObject#getFloat(String)
* @see JSONObject#getBoolean(String)
*/
public String getString(String key) {
Object object = this.get(key);
if (object instanceof String) {
return (String)object;
}
throw new RuntimeException("JSONObject[" + quote(key) + "] not a string.");
}
/**
* Get an optional string associated with a key.
* It returns the defaultValue if there is no such key.
*
* @param key A key string.
* @param defaultValue The default.
* @return A string which is the value.
*/
public String getString(String key, String defaultValue) {
Object object = this.opt(key);
return NULL.equals(object) ? defaultValue : object.toString();
}
/**
* Gets the int value associated with a key
*
* @webref jsonobject:method
* @brief Gets the int value associated with a key
* @param key A key string.
* @return The integer value.
* @throws JSONException if the key is not found or if the value cannot
* be converted to an integer.
* @see JSONObject#getFloat(String)
* @see JSONObject#getString(String)
* @see JSONObject#getBoolean(String)
*/
public int getInt(String key) {
Object object = this.get(key);
try {
return object instanceof Number
? ((Number)object).intValue()
: Integer.parseInt((String)object);
} catch (Exception e) {
throw new RuntimeException("JSONObject[" + quote(key) + "] is not an int.");
}
}
/**
* Get an optional int value associated with a key,
* or the default if there is no such key or if the value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @param defaultValue The default.
* @return An object which is the value.
*/
public int getInt(String key, int defaultValue) {
try {
return this.getInt(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get the long value associated with a key.
*
* @param key A key string.
* @return The long value.
* @throws JSONException if the key is not found or if the value cannot
* be converted to a long.
*/
public long getLong(String key) {
Object object = this.get(key);
try {
return object instanceof Number
? ((Number)object).longValue()
: Long.parseLong((String)object);
} catch (Exception e) {
throw new RuntimeException("JSONObject[" + quote(key) + "] is not a long.", e);
}
}
/**
* Get an optional long value associated with a key,
* or the default if there is no such key or if the value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @param defaultValue The default.
* @return An object which is the value.
*/
public long getLong(String key, long defaultValue) {
try {
return this.getLong(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* @webref jsonobject:method
* @brief Gets the float value associated with a key
* @param key a key string
* @see JSONObject#getInt(String)
* @see JSONObject#getString(String)
* @see JSONObject#getBoolean(String)
*/
public float getFloat(String key) {
return (float) getDouble(key);
}
public float getFloat(String key, float defaultValue) {
try {
return getFloat(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get the double value associated with a key.
* @param key A key string.
* @return The numeric value.
* @throws JSONException if the key is not found or
* if the value is not a Number object and cannot be converted to a number.
*/
public double getDouble(String key) {
Object object = this.get(key);
try {
return object instanceof Number
? ((Number)object).doubleValue()
: Double.parseDouble((String)object);
} catch (Exception e) {
throw new RuntimeException("JSONObject[" + quote(key) + "] is not a number.");
}
}
/**
* Get an optional double associated with a key, or the
* defaultValue if there is no such key or if its value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @param defaultValue The default.
* @return An object which is the value.
*/
public double getDouble(String key, double defaultValue) {
try {
return this.getDouble(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get the boolean value associated with a key.
*
* @webref jsonobject:method
* @brief Gets the boolean value associated with a key
* @param key a key string
* @return The truth.
* @throws JSONException if the value is not a Boolean or the String "true" or "false".
* @see JSONObject#getInt(String)
* @see JSONObject#getFloat(String)
* @see JSONObject#getString(String)
*/
public boolean getBoolean(String key) {
Object object = this.get(key);
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 RuntimeException("JSONObject[" + quote(key) + "] is not a Boolean.");
}
/**
* Get an optional boolean associated with a key.
* It returns the defaultValue if there is no such key, or if it is not
* a Boolean or the String "true" or "false" (case insensitive).
*
* @param key A key string.
* @param defaultValue The default.
* @return The truth.
*/
public boolean getBoolean(String key, boolean defaultValue) {
try {
return this.getBoolean(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get the JSONArray value associated with a key.
*
* @webref jsonobject:method
* @brief Gets the JSONArray value associated with a key
* @param key a key string
* @return A JSONArray which is the value.
* @throws JSONException if the key is not found or if the value is not a JSONArray.
* @see JSONObject#getJSONObject(String)
* @see JSONObject#setJSONObject(String, JSONObject)
* @see JSONObject#setJSONArray(String, JSONArray)
*/
public JSONArray getJSONArray(String key) {
Object object = this.get(key);
if (object instanceof JSONArray) {
return (JSONArray)object;
}
throw new RuntimeException("JSONObject[" + quote(key) + "] is not a JSONArray.");
}
/**
* Get the JSONObject value associated with a key.
*
* @webref jsonobject:method
* @brief Gets the JSONObject value associated with a key
* @param key a key string
* @return A JSONObject which is the value.
* @throws JSONException if the key is not found or if the value is not a JSONObject.
* @see JSONObject#getJSONArray(String)
* @see JSONObject#setJSONObject(String, JSONObject)
* @see JSONObject#setJSONArray(String, JSONArray)
*/
public JSONObject getJSONObject(String key) {
Object object = this.get(key);
if (object instanceof JSONObject) {
return (JSONObject)object;
}
throw new RuntimeException("JSONObject[" + quote(key) + "] is not a JSONObject.");
}
// /**
// * Get an array of field names from a JSONObject.
// *
// * @return An array of field names, or null if there are no names.
// */
// public static String[] getNames(JSONObject jo) {
// int length = jo.length();
// if (length == 0) {
// return null;
// }
// Iterator iterator = jo.keys();
// String[] names = new String[length];
// int i = 0;
// while (iterator.hasNext()) {
// names[i] = (String)iterator.next();
// i += 1;
// }
// return names;
// }
//
//
// /**
// * Get an array of field names from an Object.
// *
// * @return An array of field names, or null if there are no names.
// */
// public static String[] getNames(Object object) {
// if (object == null) {
// return null;
// }
// Class klass = object.getClass();
// Field[] fields = klass.getFields();
// int length = fields.length;
// if (length == 0) {
// return null;
// }
// String[] names = new String[length];
// for (int i = 0; i < length; i += 1) {
// names[i] = fields[i].getName();
// }
// return names;
// }
/**
* Determine if the JSONObject contains a specific key.
* @param key A key string.
* @return true if the key exists in the JSONObject.
*/
public boolean hasKey(String key) {
return this.map.containsKey(key);
}
// /**
// * Increment a property of a JSONObject. If there is no such property,
// * create one with a value of 1. If there is such a property, and if
// * it is an Integer, Long, Double, or Float, then add one to it.
// * @param key A key string.
// * @return this.
// * @throws JSONException If there is already a property with this name
// * that is not an Integer, Long, Double, or Float.
// */
// public JSON increment(String key) {
// Object value = this.opt(key);
// if (value == null) {
// this.put(key, 1);
// } else if (value instanceof Integer) {
// this.put(key, ((Integer)value).intValue() + 1);
// } else if (value instanceof Long) {
// this.put(key, ((Long)value).longValue() + 1);
// } else if (value instanceof Double) {
// this.put(key, ((Double)value).doubleValue() + 1);
// } else if (value instanceof Float) {
// this.put(key, ((Float)value).floatValue() + 1);
// } else {
// throw new RuntimeException("Unable to increment [" + quote(key) + "].");
// }
// return this;
// }
/**
* Determine if the value associated with the key is null or if there is
* no value.
*
* @webref
* @param key A key string.
* @return true if there is no value associated with the key or if
* the value is the JSONObject.NULL object.
*/
public boolean isNull(String key) {
return JSONObject.NULL.equals(this.opt(key));
}
/**
* Get an enumeration of the keys of the JSONObject.
*
* @return An iterator of the keys.
*/
public Iterator keyIterator() {
// return this.keySet().iterator();
return map.keySet().iterator();
}
/**
* Get a set of keys of the JSONObject.
*
* @return A keySet.
*/
public Set keys() {
return this.map.keySet();
}
/**
* Get the number of keys stored in the JSONObject.
*
* @return The number of keys in the JSONObject.
*/
public int size() {
return this.map.size();
}
// /**
// * Produce a JSONArray containing the names of the elements of this
// * JSONObject.
// * @return A JSONArray containing the key strings, or null if the JSONObject
// * is empty.
// */
// public JSONArray names() {
// JSONArray ja = new JSONArray();
// Iterator keys = this.keys();
// while (keys.hasNext()) {
// ja.append(keys.next());
// }
// return ja.size() == 0 ? null : ja;
// }
/**
* Produce a string from a Number.
* @param number A Number
* @return A String.
* @throws JSONException If n is a non-finite number.
*/
private static String numberToString(Number number) {
if (number == null) {
throw new RuntimeException("Null pointer");
}
testValidity(number);
// Shave off trailing zeros and decimal point, if possible.
String string = number.toString();
if (string.indexOf('.') > 0 && string.indexOf('e') < 0 &&
string.indexOf('E') < 0) {
while (string.endsWith("0")) {
string = string.substring(0, string.length() - 1);
}
if (string.endsWith(".")) {
string = string.substring(0, string.length() - 1);
}
}
return string;
}
/**
* Get an optional value associated with a key.
* @param key A key string.
* @return An object which is the value, or null if there is no value.
*/
private Object opt(String key) {
return key == null ? null : this.map.get(key);
}