Summary: Ctors | Methods | Inherited Methods | [Expand All]

public class

JSONTokener

extends Object

java.lang.Object
↳	org.json.JSONTokener

Class Overview

Parses a JSON (RFC 4627) encoded string into the corresponding object. Most clients of this class will use only need the constructor and nextValue() method. Example usage:

 String json = "{"
         + "  \"query\": \"Pizza\", "
         + "  \"locations\": [ 94043, 90210 ] "
         + "}";

 JSONObject object = (JSONObject) new JSONTokener(json).nextValue();
 String query = object.getString("query");
 JSONArray locations = object.getJSONArray("locations");

For best interoperability and performance use JSON that complies with RFC 4627, such as that generated by JSONStringer. For legacy reasons this parser is lenient, so a successful parse does not indicate that the input string was valid JSON. All of the following syntax errors will be ignored:

End of line comments starting with // or # and ending with a newline character.
C-style comments starting with /* and ending with */. Such comments may not be nested.
Strings that are unquoted or 'single quoted'.
Hexadecimal integers prefixed with 0x or 0X.
Octal integers prefixed with 0.
Array elements separated by ;.
Unnecessary array separators. These are interpretted as if null was the omitted value.
Key-value pairs separated by = or =>.
Key-value pairs separated by ;.

Each tokener may be used to parse a single JSON string. Instances of this class are not thread safe. Although this class is nonfinal, it was not designed for inheritance and should not be subclassed. In particular, self-use by overridable methods is not specified. See Effective Java Item 17, "Design and Document or inheritance or else prohibit it" for further information.

Summary

Public Constructors
	JSONTokener(String in)

Public Methods
void	back() Unreads the most recent character of input.
static int	dehexchar(char hex) Returns the integer [0..15] value for the given hex character, or -1 for non-hex input.
boolean	more() Returns true until the input has been exhausted.
char	next() Returns the next available character, or the null character '\0' if all input has been exhausted.
char	next(char c) Returns the next available character if it equals `c`.
String	next(int length) Returns the next `length` characters of the input.
char	nextClean() Returns the next character that is not whitespace and does not belong to a comment.
String	nextString(char quote) Returns the string up to but not including `quote`, unescaping any character escape sequences encountered along the way.
String	nextTo(String excluded) Returns the `trimmed` string holding the characters up to but not including the first of: any character in `excluded` a newline character '\n' a carriage return '\r' The returned string shares its backing character array with this tokener's input string.
String	nextTo(char excluded) Equivalent to `nextTo(String.valueOf(excluded))`.
Object	nextValue() Returns the next value from the input.
void	skipPast(String thru) Advances past all input up to and including the next occurrence of `thru`.
char	skipTo(char to) Advances past all input up to but not including the next occurrence of `to`.
JSONException	syntaxError(String message) Returns an exception containing the given message plus the current position and the entire input string.
String	toString() Returns the current position and the entire input string.

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Is called before the object's memory is being reclaimed by the VM.
final Class<? extends Object>	getClass() Returns the unique instance of `Class` which represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.

Public Constructors

public JSONTokener (String in)

Since: API Level 1

Parameters

in	JSON encoded string. Null is not permitted and will yield a tokener that throws `NullPointerExceptions` when methods are called.

Public Methods

public void back ()

Since: API Level 1

Unreads the most recent character of input. If no input characters have been read, the input is unchanged.

public static int dehexchar (char hex)

Since: API Level 1

Returns the integer [0..15] value for the given hex character, or -1 for non-hex input.

Parameters

hex	a character in the ranges [0-9], [A-F] or [a-f]. Any other character will yield a -1 result.

public boolean more ()

Since: API Level 1

Returns true until the input has been exhausted.

public char next ()

Since: API Level 1

Returns the next available character, or the null character '\0' if all input has been exhausted. The return value of this method is ambiguous for JSON strings that contain the character '\0'.

public char next (char c)

Since: API Level 1

Returns the next available character if it equals c. Otherwise an exception is thrown.

Throws

JSONException

public String next (int length)

Since: API Level 1

Returns the next length characters of the input.

The returned string shares its backing character array with this tokener's input string. If a reference to the returned string may be held indefinitely, you should use new String(result) to copy it first to avoid memory leaks.

Throws

JSONException	if the remaining input is not long enough to satisfy this request.

public char nextClean ()

Since: API Level 1

Returns the next character that is not whitespace and does not belong to a comment. If the input is exhausted before such a character can be found, the null character '\0' is returned. The return value of this method is ambiguous for JSON strings that contain the character '\0'.

Throws

JSONException

public String nextString (char quote)

Since: API Level 1

Returns the string up to but not including quote, unescaping any character escape sequences encountered along the way. The opening quote should have already been read. This consumes the closing quote, but does not include it in the returned string.

Parameters

quote	either ' or ".

Throws

NumberFormatException	if any unicode escape sequences are malformed.
JSONException

public String nextTo (String excluded)

Since: API Level 1

Returns the trimmed string holding the characters up to but not including the first of:

any character in excluded
a newline character '\n'
a carriage return '\r'

The returned string shares its backing character array with this tokener's input string. If a reference to the returned string may be held indefinitely, you should use new String(result) to copy it first to avoid memory leaks.

Returns

a possibly-empty string

public String nextTo (char excluded)

Since: API Level 1

Equivalent to nextTo(String.valueOf(excluded)).

public Object nextValue ()

Since: API Level 1

Returns the next value from the input.

Returns

a JSONObject, JSONArray, String, Boolean, Integer, Long, Double or NULL.

Throws

JSONException	if the input is malformed.

public void skipPast (String thru)

Since: API Level 1

Advances past all input up to and including the next occurrence of thru. If the remaining input doesn't contain thru, the input is exhausted.

public char skipTo (char to)

Since: API Level 1

Advances past all input up to but not including the next occurrence of to. If the remaining input doesn't contain to, the input is unchanged.

public JSONException syntaxError (String message)

Since: API Level 1

Returns an exception containing the given message plus the current position and the entire input string.

public String toString ()

Since: API Level 1

Returns the current position and the entire input string.

Returns

a printable representation of this object.

Classes

Exceptions

JSONTokener

Class Overview

Summary

Public Constructors

public JSONTokener (String in)

Parameters

Public Methods

public void back ()

public static int dehexchar (char hex)

Parameters

public boolean more ()

public char next ()

public char next (char c)

Throws

public String next (int length)

Throws

public char nextClean ()

Throws

public String nextString (char quote)

Parameters

Throws

public String nextTo (String excluded)

Returns

public String nextTo (char excluded)

public Object nextValue ()

Returns

Throws

public void skipPast (String thru)

public char skipTo (char to)

public JSONException syntaxError (String message)

public String toString ()

Returns