Package org.codehaus.jettison.json
Class JSONTokener
- java.lang.Object
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- org.codehaus.jettison.json.JSONTokener
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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:
- 2
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Field Summary
Fields Modifier and Type Field Description private int
myIndex
The index of the next character.private java.lang.String
mySource
The source string being tokenized.private int
recursionDepth
private int
threshold
static boolean
USE_BIGDECIMAL_JSONTOKENER
private static java.lang.String
USE_BIGDECIMAL_JSONTOKENER_KEY
protected boolean
useBigDecimal
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Constructor Summary
Constructors Constructor Description JSONTokener(java.lang.String s)
Construct a JSONTokener from a string.JSONTokener(java.lang.String s, int threshold)
Construct a JSONTokener from a string.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
back()
Back up one character.private void
checkRecursionDepth()
static int
dehexchar(char c)
Get the hex value of a character (base16).int
getThreshold()
boolean
more()
Determine if the source string still contains characters that next() can consume.protected JSONArray
newJSONArray()
protected JSONObject
newJSONObject()
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 and comments (slashslash, slashstar, and hash).java.lang.String
nextString(char quote)
Return the characters up to the next close quote character.java.lang.String
nextTo(char d)
Get the text up but not including the specified character or the end of line, whichever comes first.java.lang.String
nextTo(java.lang.String delimiters)
Get the text up but not including one of the specified delimeter characters or the end of line, whichever comes first.java.lang.Object
nextValue()
Get the next value.void
skipPast(java.lang.String to)
Skip characters until past the requested string.char
skipTo(char to)
Skip characters until the next character is the requested character.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.
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Field Detail
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USE_BIGDECIMAL_JSONTOKENER_KEY
private static final java.lang.String USE_BIGDECIMAL_JSONTOKENER_KEY
- See Also:
- Constant Field Values
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USE_BIGDECIMAL_JSONTOKENER
public static final boolean USE_BIGDECIMAL_JSONTOKENER
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useBigDecimal
protected boolean useBigDecimal
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myIndex
private int myIndex
The index of the next character.
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mySource
private java.lang.String mySource
The source string being tokenized.
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threshold
private int threshold
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recursionDepth
private int recursionDepth
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Constructor Detail
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JSONTokener
public JSONTokener(java.lang.String s)
Construct a JSONTokener from a string.- Parameters:
s
- A source string.
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JSONTokener
public JSONTokener(java.lang.String s, int threshold)
Construct a JSONTokener from a string.- Parameters:
s
- A source string.threshold
- A source threshold.
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Method Detail
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getThreshold
public int getThreshold()
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back
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.
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dehexchar
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.
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more
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.
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next
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.
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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.
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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.
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nextClean
public char nextClean() throws JSONException
Get the next char in the string, skipping whitespace and comments (slashslash, slashstar, and hash).- Returns:
- A character, or 0 if there are no more characters.
- Throws:
JSONException
- JSONException
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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.
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nextTo
public java.lang.String nextTo(char d)
Get the text up but not including the specified character or the end of line, whichever comes first.- Parameters:
d
- A delimiter character.- Returns:
- A string.
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nextTo
public java.lang.String nextTo(java.lang.String delimiters)
Get the text up but not including one of the specified delimeter characters or the end of line, whichever comes first.- Parameters:
delimiters
- A set of delimiter characters.- Returns:
- A string, trimmed.
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nextValue
public java.lang.Object nextValue() throws JSONException
Get the next value. The value can be a Boolean, Double/BigDecimal (depending on -Djettison.json.jsontokener.use_bigdecimal), Integer, JSONArray, JSONObject, Long, or String, or the JSONObject.NULL object.- Returns:
- An object.
- Throws:
JSONException
- If syntax error.
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newJSONObject
protected JSONObject newJSONObject() throws JSONException
- Throws:
JSONException
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newJSONArray
protected JSONArray newJSONArray() throws JSONException
- Throws:
JSONException
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checkRecursionDepth
private void checkRecursionDepth() throws JSONException
- Throws:
JSONException
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skipTo
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.
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skipPast
public void skipPast(java.lang.String to)
Skip characters until past the requested string. If it is not found, we are left at the end of the source.- Parameters:
to
- A string to skip past.
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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
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toString
public java.lang.String toString()
Make a printable string of this JSONTokener.- Overrides:
toString
in classjava.lang.Object
- Returns:
- " at character [this.myIndex] of [this.mySource]"
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