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package
org
.
json
;
/*
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
.
IOException
;
import
java
.
io
.
StringWriter
;
import
java
.
io
.
Writer
;
import
java
.
lang
.
reflect
.
Field
;
import
java
.
lang
.
reflect
.
Method
;
import
java
.
lang
.
reflect
.
Modifier
;
import
java
.
math
.
BigDecimal
;
import
java
.
math
.
BigInteger
;
import
java
.
util
.*;
import
java
.
util
.
Map
.
Entry
;
/**
* 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>
* </ul>
*
* @author JSON.org
* @version 2016-03-05
*/
public
class
JSONObject
{
/**
* 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".
*/
public
String
toString
() {
return
"null"
;
}
}
/**
* The map where the JSONObject's properties are kept.
*/
private
final
Map
<
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.
*/
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.
*/
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
) {
}
}
}
/**
* 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.
*/
public
JSONObject
(
JSONTokener
x
)
throws
JSONException
{
this
();
char
c
;
String
key
;
if
(
x
.
nextClean
() !=
'{'
) {
throw
x
.
syntaxError
(
"A JSONObject text must begin with '{'"
);
}
for
(;;) {
c
=
x
.
nextClean
();
switch
(
c
) {
case
0
:
throw
x
.
syntaxError
(
"A JSONObject text must end with '}'"
);
case
'}'
:
return
;
default
:
x
.
back
();
key
=
x
.
nextValue
().
toString
();
}
// The key is followed by ':'.
c
=
x
.
nextClean
();
if
(
c
!=
':'
) {
throw
x
.
syntaxError
(
"Expected a ':' after a key"
);
}
this
.
putOnce
(
key
,
x
.
nextValue
());
// Pairs are separated by ','.
switch
(
x
.
nextClean
()) {
case
';'
:
case
','
:
if
(
x
.
nextClean
() ==
'}'
) {
return
;
}
x
.
back
();
break
;
case
'}'
:
return
;
default
:
throw
x
.
syntaxError
(
"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.
*/
public
JSONObject
(
Map
<?, ?>
map
) {
this
.
map
=
new
HashMap
<
String
,
Object
>();
if
(
map
!=
null
) {
for
(
final
Entry
<?, ?>
e
:
map
.
entrySet
()) {
final
Object
value
=
e
.
getValue
();
if
(
value
!=
null
) {
this
.
map
.
put
(
String
.
valueOf
(
e
.
getKey
()),
wrap
(
value
));
}
}
}
}
/**
* 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.
*/
public
JSONObject
(
Object
bean
) {
this
();
this
.
populateMap
(
bean
);
}
/**
* 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.
*/
public
JSONObject
(
String
source
)
throws
JSONException
{
this
(
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
JSONObject
(
String
baseName
,
Locale
locale
)
throws
JSONException
{
this
();
ResourceBundle
bundle
=
ResourceBundle
.
getBundle
(
baseName
,
locale
,
Thread
.
currentThread
().
getContextClassLoader
());
// Iterate through the keys in the bundle.
Enumeration
<
String
>
keys
=
bundle
.
getKeys
();
while
(
keys
.
hasMoreElements
()) {
Object
key
=
keys
.
nextElement
();
if
(
key
!=
null
) {
// 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
;
JSONObject
target
=
this
;
for
(
int
i
=
0
;
i
<
last
;
i
+=
1
) {
String
segment
=
path
[
i
];
JSONObject
nextTarget
=
target
.
optJSONObject
(
segment
);
if
(
nextTarget
==
null
) {
nextTarget
=
new
JSONObject
();
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.
*/
public
static
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.
*/
public
Object
get
(
String
key
)
throws
JSONException
{
if
(
key
==
null
) {
throw
new
JSONException
(
"Null key."
);
}
Object
object
=
this
.
opt
(
key
);
if
(
object
==
null
) {
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
) +
"] not found."
);
}
return
object
;
}
/**
* Get the enum value associated with a key.
*
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @return The enum value associated with the key
* @throws JSONException
* if the key is not found or if the value cannot be converted
* to an enum.
*/
public
<
E
extends
Enum
<
E
>>
E
getEnum
(
Class
<
E
>
clazz
,
String
key
)
throws
JSONException
{
E
val
=
optEnum
(
clazz
,
key
);
if
(
val
==
null
) {
// JSONException should really take a throwable argument.
// If it did, I would re-implement this with the Enum.valueOf
// method and place any thrown exception in the JSONException
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] is not an enum of type "
+
quote
(
clazz
.
getSimpleName
())
+
"."
);
}
return
val
;
}
/**
* Get 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".
*/
public
boolean
getBoolean
(
String
key
)
throws
JSONException
{
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
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] is not a Boolean."
);
}
/**
* Get the BigInteger 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 cannot
* be converted to BigInteger.
*/
public
BigInteger
getBigInteger
(
String
key
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
try
{
return
new
BigInteger
(
object
.
toString
());
}
catch
(
Exception
e
) {
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] could not be converted to BigInteger."
);
}
}
/**
* Get the BigDecimal 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
* cannot be converted to BigDecimal.
*/
public
BigDecimal
getBigDecimal
(
String
key
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
try
{
return
new
BigDecimal
(
object
.
toString
());
}
catch
(
Exception
e
) {
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] could not be converted to BigDecimal."
);
}
}
/**
* 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
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
try
{
return
object
instanceof
Number
? ((
Number
)
object
).
doubleValue
()
:
Double
.
parseDouble
((
String
)
object
);
}
catch
(
Exception
e
) {
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] is not a number."
);
}
}
/**
* Get 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.
*/
public
int
getInt
(
String
key
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
try
{
return
object
instanceof
Number
? ((
Number
)
object
).
intValue
()
:
Integer
.
parseInt
((
String
)
object
);
}
catch
(
Exception
e
) {
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] is not an int."
);
}
}
/**
* Get 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.
*/
public
JSONArray
getJSONArray
(
String
key
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
if
(
object
instanceof
JSONArray
) {
return
(
JSONArray
)
object
;
}
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] is not a JSONArray."
);
}
/**
* Get 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.
*/
public
JSONObject
getJSONObject
(
String
key
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
if
(
object
instanceof
JSONObject
) {
return
(
JSONObject
)
object
;
}
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] is not a JSONObject."
);
}
/**
* 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
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
try
{
return
object
instanceof
Number
? ((
Number
)
object
).
longValue
()
:
Long
.
parseLong
((
String
)
object
);
}
catch
(
Exception
e
) {
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
)
+
"] is not a long."
);
}
}
/**
* 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
<
String
>
iterator
=
jo
.
keys
();
String
[]
names
=
new
String
[
length
];
int
i
=
0
;
while
(
iterator
.
hasNext
()) {
names
[
i
] =
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
;
}
/**
* Get the string 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.
*/
public
String
getString
(
String
key
)
throws
JSONException
{
Object
object
=
this
.
get
(
key
);
if
(
object
instanceof
String
) {
return
(
String
)
object
;
}
throw
new
JSONException
(
"JSONObject["
+
quote
(
key
) +
"] not a string."
);
}
/**
* Determine if the JSONObject contains a specific key.
*
* @param key
* A key string.
* @return true if the key exists in the JSONObject.
*/
public
boolean
has
(
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
JSONObject
increment
(
String
key
)
throws
JSONException
{
Object
value
=
this
.
opt
(
key
);
if
(
value
==
null
) {
this
.
put
(
key
,
1
);
}
else
if
(
value
instanceof
BigInteger
) {
this
.
put
(
key
, ((
BigInteger
)
value
).
add
(
BigInteger
.
ONE
));
}
else
if
(
value
instanceof
BigDecimal
) {
this
.
put
(
key
, ((
BigDecimal
)
value
).
add
(
BigDecimal
.
ONE
));
}
else
if
(
value
instanceof
Integer
) {
this
.
put
(
key
, (
Integer
)
value
+
1
);
}
else
if
(
value
instanceof
Long
) {
this
.
put
(
key
, (
Long
)
value
+
1
);
}
else
if
(
value
instanceof
Double
) {
this
.
put
(
key
, (
Double
)
value
+
1
);
}
else
if
(
value
instanceof
Float
) {
this
.
put
(
key
, (
Float
)
value
+
1
);
}
else
{
throw
new
JSONException
(
"Unable to increment ["
+
quote
(
key
) +
"]."
);
}
return
this
;
}
/**
* Determine if the value associated with the key is null or if there is no
* value.
*
* @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
<
String
>
keys
() {
return
this
.
keySet
().
iterator
();
}
/**
* Get a set of keys of the JSONObject.
*
* @return A keySet.
*/
public
Set
<
String
>
keySet
() {
return
this
.
map
.
keySet
();
}
/**
* Get the number of keys stored in the JSONObject.
*
* @return The number of keys in the JSONObject.
*/
public
int
length
() {
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
<
String
>
keys
=
this
.
keys
();
while
(
keys
.
hasNext
()) {
ja
.
put
(
keys
.
next
());
}
return
ja
.
length
() ==
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.
*/
public
static
String
numberToString
(
Number
number
)
throws
JSONException
{
if
(
number
==
null
) {
throw
new
JSONException
(
"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.
*/
public
Object
opt
(
String
key
) {
return
key
==
null
?
null
:
this
.
map
.
get
(
key
);
}
/**
* Get the enum value associated with a key.
*
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @return The enum value associated with the key or null if not found
*/
public
<
E
extends
Enum
<
E
>>
E
optEnum
(
Class
<
E
>
clazz
,
String
key
) {
return
this
.
optEnum
(
clazz
,
key
,
null
);
}
/**
* Get the enum value associated with a key.
*
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @param defaultValue
* The default in case the value is not found
* @return The enum value associated with the key or defaultValue
* if the value is not found or cannot be assigned to clazz
*/
public
<
E
extends
Enum
<
E
>>
E
optEnum
(
Class
<
E
>
clazz
,
String
key
,
E
defaultValue
) {
try
{
Object
val
=
this
.
opt
(
key
);
if
(
NULL
.
equals
(
val
)) {
return
defaultValue
;
}
if
(
clazz
.
isAssignableFrom
(
val
.
getClass
())) {
// we just checked it!
@
SuppressWarnings
(
"unchecked"
)
E
myE
= (
E
)
val
;
return
myE
;
}
return
Enum
.
valueOf
(
clazz
,
val
.
toString
());
}
catch
(
IllegalArgumentException
e
) {
return
defaultValue
;
}
catch
(
NullPointerException
e
) {
return
defaultValue
;
}
}
/**
* Get an optional boolean associated with a key. It returns false if there
* is no such key, or if the value is not Boolean.TRUE or the String "true".
*
* @param key
* A key string.
* @return The truth.
*/
public
boolean
optBoolean
(
String
key
) {
return
this
.
optBoolean
(
key
,
false
);
}
/**
* 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
optBoolean
(
String
key
,
boolean
defaultValue
) {
try
{
return
this
.
getBoolean
(
key
);
}
catch
(
Exception
e
) {
return
defaultValue
;
}
}
/**
* Get an optional double associated with a key, or NaN 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 string which is the key.
* @return An object which is the value.
*/
public
double
optDouble
(
String
key
) {
return
this
.
optDouble
(
key
,
Double
.
NaN
);
}
/**
* Get an optional BigInteger 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
BigInteger
optBigInteger
(
String
key
,
BigInteger
defaultValue
) {
try
{
return
this
.
getBigInteger
(
key
);
}
catch
(
Exception
e
) {
return
defaultValue
;
}
}
/**
* Get an optional BigDecimal 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
BigDecimal
optBigDecimal
(
String
key
,
BigDecimal
defaultValue
) {
try
{
return
this
.
getBigDecimal
(
key
);
}
catch
(
Exception
e
) {
return
defaultValue
;
}
}
/**
* 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
optDouble
(
String
key
,
double
defaultValue
) {
try
{
return
this
.
getDouble
(
key
);
}
catch
(
Exception
e
) {
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