public class

JSONTokener

extends Object
java.lang.Object
   ↳ com.microstrategy.web.app.tasks.architect.json.JSONTokener
Known Direct Subclasses

Class Overview

A JSONTokener takes a source string and extracts characters and tokens from it. It is used by the JSONObject and JSONArray constructors to parse JSON source strings.

Summary

Public Constructors
JSONTokener(Reader reader)
Construct a JSONTokener from a Reader.
JSONTokener(InputStream inputStream)
Construct a JSONTokener from an InputStream.
JSONTokener(String s)
Construct a JSONTokener from a string.
Public Methods
void back()
Back up one character.
static int dehexchar(char c)
Get the hex value of a character (base16).
boolean end()
boolean more()
Determine if the source string still contains characters that next() can consume.
String next(int n)
Get the next n characters.
char next(char c)
Consume the next character, and check that it matches a specified character.
char next()
Get the next character in the source string.
char nextClean()
Get the next char in the string, skipping whitespace.
String nextString(char quote)
Return the characters up to the next close quote character.
String nextTo(char delimiter)
Get the text up but not including the specified character or the end of line, whichever comes first.
String nextTo(String delimiters)
Get the text up but not including one of the specified delimiter characters or the end of line, whichever comes first.
Object nextValue()
Get the next value.
char skipTo(char to)
Skip characters until the next character is the requested character.
JSONException syntaxError(String message)
Make a JSONException to signal a syntax error.
String toString()
Make a printable string of this JSONTokener.
[Expand]
Inherited Methods
From class java.lang.Object

Public Constructors

public JSONTokener (Reader reader)

Construct a JSONTokener from a Reader.

Parameters
reader A reader.

public JSONTokener (InputStream inputStream)

Construct a JSONTokener from an InputStream.

Throws
JSONException

public JSONTokener (String s)

Construct a JSONTokener from a string.

Parameters
s A source string.

Public Methods

public void back ()

Back up one character. This provides a sort of lookahead capability, so that you can test for a digit or letter before attempting to parse the next number or identifier.

Throws
JSONException

public static int dehexchar (char c)

Get the hex value of a character (base16).

Parameters
c A character between '0' and '9' or between 'A' and 'F' or between 'a' and 'f'.
Returns
  • An int between 0 and 15, or -1 if c was not a hex digit.

public boolean end ()

public boolean more ()

Determine if the source string still contains characters that next() can consume.

Returns
  • true if not yet at the end of the source.
Throws
JSONException

public String next (int n)

Get the next n characters.

Parameters
n The number of characters to take.
Returns
  • A string of n characters.
Throws
JSONException Substring bounds error if there are not n characters remaining in the source string.

public char next (char c)

Consume the next character, and check that it matches a specified character.

Parameters
c The character to match.
Returns
  • The character.
Throws
JSONException if the character does not match.

public char next ()

Get the next character in the source string.

Returns
  • The next character, or 0 if past the end of the source string.
Throws
JSONException

public char nextClean ()

Get the next char in the string, skipping whitespace.

Returns
  • A character, or 0 if there are no more characters.
Throws
JSONException
JSONException

public String nextString (char quote)

Return the characters up to the next close quote character. Backslash processing is done. The formal JSON format does not allow strings in single quotes, but an implementation is allowed to accept them.

Parameters
quote The quoting character, either " (double quote) or ' (single quote).
Returns
  • A String.
Throws
JSONException Unterminated string.

public String nextTo (char delimiter)

Get the text up but not including the specified character or the end of line, whichever comes first.

Parameters
delimiter A delimiter character.
Returns
  • A string.
Throws
JSONException

public String nextTo (String delimiters)

Get the text up but not including one of the specified delimiter characters or the end of line, whichever comes first.

Parameters
delimiters A set of delimiter characters.
Returns
  • A string, trimmed.
Throws
JSONException

public Object nextValue ()

Get the next value. The value can be a Boolean, Double, Integer, JSONArray, JSONObject, Long, or String, or the JSONObject.NULL object.

Returns
  • An object.
Throws
JSONException If syntax error.

public char skipTo (char to)

Skip characters until the next character is the requested character. If the requested character is not found, no characters are skipped.

Parameters
to A character to skip to.
Returns
  • The requested character, or zero if the requested character is not found.
Throws
JSONException

public JSONException syntaxError (String message)

Make a JSONException to signal a syntax error.

Parameters
message The error message.
Returns
  • A JSONException object, suitable for throwing

public String toString ()

Make a printable string of this JSONTokener.

Returns
  • " at {index} [character {character} line {line}]"