twitter4j

Class JSONTokener

java.lang.Object

twitter4j.JSONTokener

public class JSONTokener
extends java.lang.Object

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.

Version:

2010-12-24

Author:

JSON.org

Field Summary

Fields

Modifier and Type	Field and Description
private int	character
private boolean	eof
private int	index
private int	line
private char	previous
private java.io.Reader	reader
private boolean	usePrevious

Constructor Summary

Constructors

Constructor and Description
JSONTokener(java.io.InputStream inputStream) Construct a JSONTokener from an InputStream.
JSONTokener(java.io.Reader reader) Construct a JSONTokener from a Reader.
JSONTokener(java.lang.String s) Construct a JSONTokener from a string.

Method Summary

Methods

Modifier and Type	Method and Description
void	back() Back up one character.
boolean	end()
boolean	more() Determine if the source string still contains characters that next() can consume.
char	next() Get the next character in the source string.
char	next(char c) Consume the next character, and check that it matches a specified character.
java.lang.String	next(int n) Get the next n characters.
char	nextClean() Get the next char in the string, skipping whitespace.
java.lang.String	nextString(char quote) Return the characters up to the next close quote character.
java.lang.Object	nextValue() Get the next value.
JSONException	syntaxError(java.lang.String message) Make a JSONException to signal a syntax error.
java.lang.String	toString() Make a printable string of this JSONTokener.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

character

private int character

eof

private boolean eof

index

private int index

line

private int line

previous

private char previous

reader

private final java.io.Reader reader

usePrevious

private boolean usePrevious

Constructor Detail

JSONTokener

public JSONTokener(java.io.Reader reader)

Construct a JSONTokener from a Reader.

Parameters:

reader - A reader.

JSONTokener

public JSONTokener(java.io.InputStream inputStream)
            throws JSONException

Construct a JSONTokener from an InputStream.

Throws:

JSONException

JSONTokener

public JSONTokener(java.lang.String s)

Construct a JSONTokener from a string.

Parameters:

s - A source string.

Method Detail

back

public void back()
          throws JSONException

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

end

public boolean end()

more

public boolean more()
             throws JSONException

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

next

public char next()
          throws JSONException

Get the next character in the source string.

Returns:

The next character, or 0 if past the end of the source string.

Throws:

JSONException

next

public char next(char c)
          throws JSONException

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.

next

public java.lang.String next(int n)
                      throws JSONException

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.

nextClean

public char nextClean()
               throws JSONException

Get the next char in the string, skipping whitespace.

Returns:

A character, or 0 if there are no more characters.

Throws:

JSONException

nextString

public java.lang.String nextString(char quote)
                            throws JSONException

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.

nextValue

public java.lang.Object nextValue()
                           throws JSONException

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.

syntaxError

public JSONException syntaxError(java.lang.String message)

Make a JSONException to signal a syntax error.

Parameters:

message - The error message.

Returns:

A JSONException object, suitable for throwing

toString

public java.lang.String toString()

Make a printable string of this JSONTokener.

Overrides:

toString in class java.lang.Object

Returns:

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