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package
org
.
json
.
stream
;
/*
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
org
.
json
.
JSONException
;
import
org
.
json
.
JSONObject
;
import
org
.
json
.
JSONParseException
;
import
org
.
json
.
ParsePosition
;
import
org
.
json
.
stream
.
JSONLexer
.
Token
;
import
org
.
json
.
util
.
ALStack
;
import
org
.
json
.
util
.
BufferedAppendable
;
import
java
.
io
.
IOException
;
import
java
.
io
.
InputStream
;
import
java
.
io
.
Reader
;
import
java
.
math
.
BigDecimal
;
import
java
.
math
.
BigInteger
;
import
java
.
nio
.
charset
.
Charset
;
/**
* Reads a JSON document as a stream of JSON events. Uses an iterator model
* to produce each event. Similar to a StAX event model in XML processing.
* <p>
* For a streaming equivalent for writing JSON data, see the {@link org.json.JSONWriter}
* and {@link org.json.JSONStringer} classes.</p>
* <p>
* A simple example of how to use this class:</p>
* <pre>
* JSONStreamReader reader = new JSONStreamReader(JSON_TEXT);
*
* while(reader.hasNext()) {
* ParseState state = reader.nextState();
* switch(state) {
* case KEY:
* System.out.println("KEY = " + reader.nextKey() );
* break;
* case NULL_VALUE:
* case BOOLEAN_VALUE:
* case NUMBER_VALUE:
* case STRING_VALUE:
* System.out.println(state + " = " + reader.nextValue());
* break;
* default:
* System.out.println(state);
* }
* }
* </pre>
* <p>
* A more complete example can be found by reading the {@link JSONObjectBuilder}
* source code.</p>
*
* @author JSON.org
* @version 2016-06-26
*/
public
class
JSONStreamReader
{
private
static
final
int
NONE
=
0
;
private
static
final
int
INTERNAL
=
1
;
private
static
final
int
VALUE
=
2
;
private
static
final
int
TEXT
=
4
;
private
static
final
int
BEGIN_STRUCTURE
=
8
;
private
static
final
int
END_STRUCTURE
=
16
;
private
static
final
int
DOCUMENT_DELIMITER
=
32
;
private
static
final
int
ARRAY_DELIMITER
=
64
;
private
static
final
int
OBJECT_DELIMITER
=
128
;
private
static
final
int
SEPARATOR
=
256
;
/**
* States of the internal state machine. Tokens returned from the
* {@link JSONStreamReader#nextState() nextState()} loop are a subset of
* these states.
* <p>
* The states are similar in convention to the write methods in
* {@code JSONWriter}, such as pairing {@code OBJECT} with {@code END_OBJECT},
* and {@code ARRAY} with {@code END_ARRAY}.
* </p>
*/
public
enum
ParseState
{
/** <em>Internal state</em> -- before the DOCUMENT state */
INIT
(
INTERNAL
),
/** Start a JSON document */
DOCUMENT
(
BEGIN_STRUCTURE
|
DOCUMENT_DELIMITER
),
/** Start a JSON object */
OBJECT
(
BEGIN_STRUCTURE
|
OBJECT_DELIMITER
),
/** End a JSON object */
END_OBJECT
(
END_STRUCTURE
|
OBJECT_DELIMITER
),
/** Start a JSON array */
ARRAY
(
BEGIN_STRUCTURE
|
ARRAY_DELIMITER
),
/** End a JSON array */
END_ARRAY
(
END_STRUCTURE
|
ARRAY_DELIMITER
),
/** <em>Internal state</em> -- between a KEY and *_VALUE states */
KEY_SEPARATOR
(
INTERNAL
|
SEPARATOR
),
/** <em>Internal state</em> -- after a *_VALUE state */
VALUE_SEPARATOR
(
INTERNAL
|
SEPARATOR
),
/** A key of a JSON object */
KEY
(
TEXT
),
/** The {@code JSONObject.Null} value */
NULL_VALUE
(
VALUE
),
/** The {@code Boolean.TRUE} or {@code Boolean.FALSE} value */
BOOLEAN_VALUE
(
VALUE
),
/** A {@code Number} value */
NUMBER_VALUE
(
VALUE
),
/** A {@code String} value */
STRING_VALUE
(
VALUE
|
TEXT
),
/** End a JSON document */
END_DOCUMENT
(
END_STRUCTURE
|
DOCUMENT_DELIMITER
);
private
final
int
type
;
ParseState
(
int
type
) {
this
.
type
=
type
;
}
/**
* Is this state an internal state -- that is, one that would not
* be returned from the {@link JSONStreamReader#nextState() nextState()}
* method.
*
* @return {@code true} to indicate an internal state, otherwise {@code false}
*/
public
boolean
isInternal
() {
return
(
this
.
type
&
INTERNAL
) !=
NONE
;
}
/**
* Is this state a value state -- that is, one of {@code NULL_VALUE},
* {@code BOOLEAN_VALUE}, {@code NUMBER_VALUE}, or {@code STRING_VALUE}
*
* @return {@code true} to indicate a value state, otherwise {@code false}
*/
public
boolean
isValue
() {
return
(
this
.
type
&
VALUE
) !=
NONE
;
}
/**
* Is this state a beginning of a JSON structure -- that is, one of
* {@code DOCUMENT}, {@code OBJECT}, or {@code ARRAY}.
*
* @return {@code true} to indicate a beginning of a JSON structure,
* otherwise {@code false}
*/
public
boolean
isBeginStructure
() {
return
(
this
.
type
&
BEGIN_STRUCTURE
) !=
NONE
;
}
/**
* Is this state an end of a JSON structure -- that is, one of
* {@code END_DOCUMENT}, {@code END_OBJECT}, or {@code END_ARRAY}.
*
* @return {@code true} to indicate an end of a JSON structure,
* otherwise {@code false}
*/
public
boolean
isEndStructure
() {
return
(
this
.
type
&
END_STRUCTURE
) !=
NONE
;
}
/**
* Is this state a text state -- that is, either a {@code KEY} or
* a {@code STRING_VALUE} state.
*
* @return {@code true} to indicate a text state, otherwise {@code false}
*/
public
boolean
isText
() {
return
(
this
.
type
&
TEXT
) !=
NONE
;
}
/**
* Is this state a document delimiter -- that is, either a
* {@code DOCUMENT} or an {@code END_DOCUMENT} state.
*
* @return {@code true} to indicate a document delimiter state,
* otherwise {@code false}
*/
public
boolean
isDocumentDelimiter
() {
return
(
this
.
type
&
DOCUMENT_DELIMITER
) !=
NONE
;
}
/**
* Is this state an object delimiter -- that is, either an
* {@code OBJECT} or an {@code END_OBJECT} state.
*
* @return {@code true} to indicate an object delimiter state,
* otherwise {@code false}
*/
public
boolean
isObjectDelimiter
() {
return
(
this
.
type
&
OBJECT_DELIMITER
) !=
NONE
;
}
/**
* Is this state an array delimiter -- that is, either an
* {@code ARRAY} or an {@code END_ARRAY} state.
*
* @return {@code true} to indicate an array delimiter state,
* otherwise {@code false}
*/
public
boolean
isArrayDelimiter
() {
return
(
this
.
type
&
ARRAY_DELIMITER
) !=
NONE
;
}
/**
* Is this state a separator -- that is, either a {@code KEY_SEPARATOR}
* or a {@code VALUE_SEPARATOR}.
*
* @return {@code true} to indicate a separator, otherwise {@code false}
*/
public
boolean
isSeparator
() {
return
(
this
.
type
&
SEPARATOR
) !=
NONE
;
}
}
protected
final
JSONLexer
lexer
;
protected
final
ALStack
<
Token
>
objectStack
=
new
ALStack
<
Token
>();
// START_ARRAY, START_OBJECT, or one of the _VALUEs
protected
final
BufferedAppendable
bufferedAppender
;
protected
ParseState
state
=
ParseState
.
INIT
;
/**
* Construct a {@code JSONStreamReader} from a {@code Reader}.
*
* @param reader A reader.
*/
public
JSONStreamReader
(
Reader
reader
) {
lexer
=
new
JSONLexer
(
reader
);
bufferedAppender
=
new
BufferedAppendable
();
}
/**
* Construct a {@code JSONStreamReader} from an {@code InputStream} and
* a supplied {@code Charset}.
*
* @param inputStream the input stream containing the JSON data
* @param charset the character set with which to interpret the
* input stream
*/
public
JSONStreamReader
(
InputStream
inputStream
,
Charset
charset
) {
lexer
=
new
JSONLexer
(
inputStream
,
charset
);
bufferedAppender
=
new
BufferedAppendable
();
}
/**
* Construct a {@code JSONStreamReader} from a {@code String}.
*
* @param s A source string.
*/
public
JSONStreamReader
(
String
s
) {
lexer
=
new
JSONLexer
(
s
);
bufferedAppender
=
new
BufferedAppendable
();
}
/**
* Are there more parse states remaining in the source stream.
*
* @return {@code true} if there are more parse states remaining, otherwise
* {@code false}
*/
public
boolean
hasNext
() {
return
state
!=
ParseState
.
END_DOCUMENT
;
}
/**
* An assertive form of {@link #nextState()}, where the intended next state
* is validated against the state that was found.
*
* @param assertState the expected next state
* @throws JSONException an unexpected state was parsed, or there was a
* problem with the source stream
*/
public
void
assertNextState
(
ParseState
assertState
)
throws
JSONException
{
ParseState
token
=
nextState
();
if
(
token
!=
assertState
) {
throw
new
JSONParseException
(
"Expected "
+
assertState
+
", got "
+
token
,
lexer
.
parsePosition
());
}
}
/**
* Advance the parser onto the next state in the source stream, and
* return a {@link ParseState} representing the state that was encountered.
*
* @return one of the ParseState values
* @throws JSONException there was a problem with the source stream
*/
public
ParseState
nextState
()
throws
JSONException
{
Token
token
;
do
{
switch
(
state
) {
case
INIT
:
state
=
ParseState
.
DOCUMENT
;
break
;
case
DOCUMENT
:
parseStartValue
();
break
;
case
ARRAY
:
token
=
lexer
.
nextTokenType
();
switch
(
token
) {
case
END_ARRAY
:
objectStack
.
pop
();
state
=
ParseState
.
END_ARRAY
;
break
;
case
START_ARRAY
:
objectStack
.
push
(
token
);
state
=
ParseState
.
ARRAY
;
break
;
case
START_OBJECT
:
objectStack
.
push
(
token
);
state
=
ParseState
.
OBJECT
;
break
;
case
NULL_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
NULL_VALUE
;
break
;
case
TRUE_VALUE
:
case
FALSE_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
BOOLEAN_VALUE
;
break
;
case
NUMBER_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
NUMBER_VALUE
;
break
;
case
STRING_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
STRING_VALUE
;
break
;
default
:
throw
new
JSONParseException
(
"Unexpected token"
,
lexer
.
parsePosition
());
}
break
;
case
OBJECT
:
token
=
lexer
.
nextTokenType
();
switch
(
token
) {
case
END_OBJECT
:
objectStack
.
pop
();
state
=
ParseState
.
END_OBJECT
;
break
;
case
STRING_VALUE
:
state
=
ParseState
.
KEY
;
break
;
default
:
throw
new
JSONParseException
(
"Unexpected token"
,
lexer
.
parsePosition
());
}
break
;
case
KEY
:
if
(
objectStack
.
isEmpty
()) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
lexer
.
skipString
();
state
=
ParseState
.
KEY_SEPARATOR
;
if
(
lexer
.
nextTokenType
() !=
Token
.
KEY_SEPARATOR
) {
throw
new
JSONParseException
(
"Expected key separator"
,
lexer
.
parsePosition
());
}
break
;
case
KEY_SEPARATOR
:
parseStartValue
();
break
;
case
NULL_VALUE
:
case
BOOLEAN_VALUE
:
case
NUMBER_VALUE
:
case
STRING_VALUE
:
skipValue
();
break
;
case
VALUE_SEPARATOR
:
case
END_ARRAY
:
case
END_OBJECT
:
if
(
objectStack
.
isEmpty
()) {
consumePostfix
();
state
=
ParseState
.
END_DOCUMENT
;
break
;
}
token
=
lexer
.
nextTokenType
();
switch
(
token
) {
case
VALUE_SEPARATOR
:
switch
(
objectStack
.
peek
()) {
case
START_OBJECT
:
token
=
lexer
.
nextTokenType
();
if
(
token
==
Token
.
STRING_VALUE
) {
state
=
ParseState
.
KEY
;
}
else
{
throw
new
JSONParseException
(
"Unexpected token"
,
lexer
.
parsePosition
());
}
break
;
case
START_ARRAY
:
parseStartValue
();
break
;
default
:
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
break
;
case
END_ARRAY
:
if
(
objectStack
.
pop
() ==
Token
.
START_ARRAY
) {
state
=
ParseState
.
END_ARRAY
;
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
break
;
case
END_OBJECT
:
if
(
objectStack
.
pop
() ==
Token
.
START_OBJECT
) {
state
=
ParseState
.
END_OBJECT
;
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
break
;
default
:
throw
new
JSONParseException
(
"Invalid token"
,
lexer
.
parsePosition
());
}
break
;
case
END_DOCUMENT
:
break
;
}
}
while
(
state
.
isInternal
());
return
state
;
}
private
void
parseStartValue
()
throws
JSONException
{
Token
token
=
lexer
.
nextTokenType
();
switch
(
token
) {
case
START_ARRAY
:
objectStack
.
push
(
token
);
state
=
ParseState
.
ARRAY
;
break
;
case
START_OBJECT
:
objectStack
.
push
(
token
);
state
=
ParseState
.
OBJECT
;
break
;
case
NULL_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
NULL_VALUE
;
break
;
case
TRUE_VALUE
:
case
FALSE_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
BOOLEAN_VALUE
;
break
;
case
NUMBER_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
NUMBER_VALUE
;
break
;
case
STRING_VALUE
:
objectStack
.
push
(
token
);
state
=
ParseState
.
STRING_VALUE
;
break
;
case
END
:
if
(
objectStack
.
isEmpty
()) {
state
=
ParseState
.
END_DOCUMENT
;
break
;
}
default
:
throw
new
JSONParseException
(
"Invalid token"
,
lexer
.
parsePosition
());
}
}
private
void
skipValue
() {
if
(
objectStack
.
isEmpty
()) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
switch
(
token
) {
case
NULL_VALUE
:
case
TRUE_VALUE
:
case
FALSE_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
break
;
case
STRING_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
lexer
.
skipString
();
break
;
case
NUMBER_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
lexer
.
skipNumber
();
break
;
default
:
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* Scan the remaining content of the stream to ensure there is no illegal
* postfix data. Some strict definitions of JSON insist that the stream
* must be scanned to the end.
*/
private
void
consumePostfix
() {
if
(!
objectStack
.
isEmpty
() ||
state
==
ParseState
.
INIT
) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
if
(
lexer
.
nextTokenType
() !=
Token
.
END
) {
throw
new
JSONParseException
(
"Invalid token"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#KEY}, return the text
* of the key name.
* <p>
* This method advances the parser onto the next state.</p>
*
* @return the parsed text of the key
* @throws JSONException there was a problem with the source stream
*/
public
String
nextKey
()
throws
JSONException
{
if
(
state
!=
ParseState
.
KEY
) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
StringBuilder
builder
=
lexer
.
nextString
(
new
StringBuilder
());
state
=
ParseState
.
KEY_SEPARATOR
;
if
(
lexer
.
nextTokenType
() !=
Token
.
KEY_SEPARATOR
) {
throw
new
JSONParseException
(
"Expected key separator"
,
lexer
.
parsePosition
());
}
return
builder
.
toString
();
}
/**
* If the {@code ParseState} was {@link ParseState#NULL_VALUE},
* {@link ParseState#BOOLEAN_VALUE}, {@link ParseState#NUMBER_VALUE}, or
* {@link ParseState#STRING_VALUE}, return the value as an {@code Object}.
* The values that can be returned here are:
* <ul>
* <li>{@code JSONObject.NULL}</li>
* <li>{@code Boolean.TRUE} or {@code Boolean.FALSE}</li>
* <li>A {@code Double}, {@code Long}, {@code Integer},
* {@code BigInteger}, or {@code BigDecimal}</li>
* <li>A {@code String}</li>
* </ul>
* <p>
* This method advances the parser onto the next state.</p>
*
* @return an Object of the type described above
*/
public
Object
nextValue
()
throws
JSONException
{
if
(
objectStack
.
isEmpty
() || !
state
.
isValue
()) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
switch
(
token
) {
case
NULL_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
return
decodeNull
();
case
TRUE_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
return
Boolean
.
TRUE
;
case
FALSE_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
return
Boolean
.
FALSE
;
case
STRING_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
return
lexer
.
nextString
(
new
StringBuilder
()).
toString
();
case
NUMBER_VALUE
: {
state
=
ParseState
.
VALUE_SEPARATOR
;
StringBuilder
sb
=
new
StringBuilder
();
boolean
isDbl
=
lexer
.
nextNumber
(
sb
);
return
decodeNumber
(
sb
.
toString
(),
isDbl
);
}
default
:
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#STRING_VALUE},
* return the value as a {@code String}.
* <p>
* This method advances the parser onto the next state.</p>
*
* @return a String value
*/
public
String
nextStringValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
STRING_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
STRING_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
return
lexer
.
nextString
(
new
StringBuilder
()).
toString
();
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#STRING_VALUE},
* append the decoded value to the given {@code Appendable}.
* <p>
* This method is suitable for cases where very long {@code String} data is
* expected, for instance for base-64 encoded data.</p>
* <p>
* This method advances the parser onto the next state.</p>
*
* @param <T> the type of Appendable, returned to the caller
* @param writer the writer to which the String value will be written
* @return the given Appendable object
*/
public
<
T
extends
Appendable
>
T
appendNextStringValue
(
T
writer
)
throws
JSONException
{
if
((
state
!=
ParseState
.
STRING_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
if
(
writer
==
null
) {
throw
new
JSONException
(
"writer is null"
);
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
STRING_VALUE
) {
try
{
state
=
ParseState
.
VALUE_SEPARATOR
;
BufferedAppendable
buff
=
bufferedAppender
.
with
(
writer
);
try
{
lexer
.
nextString
(
buff
);
}
finally
{
buff
.
close
();
}
return
writer
;
}
catch
(
IOException
e
) {
throw
new
JSONParseException
(
"Error parsing string value"
,
e
,
lexer
.
parsePosition
());
}
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#BOOLEAN_VALUE},
* return the value as a boolean.
* <p>
* If the JSON value is not parseable as a boolean, as defined by the JSON
* grammar, a JSONException will be thrown.</p>
* <p>
* This method advances the parser onto the next state.</p>
*
* @return a boolean value
*/
public
boolean
nextBooleanValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
BOOLEAN_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
switch
(
token
) {
case
TRUE_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
return
true
;
case
FALSE_VALUE
:
state
=
ParseState
.
VALUE_SEPARATOR
;
return
false
;
default
:
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NULL_VALUE},
* return the value as a NULL object.
* <p>
* If the JSON value is not parseable as a null, as defined by the JSON
* grammar, a JSONException will be thrown.</p>
* <p>
* This method advances the parser onto the next state.</p>
*
* @return the {@code JSONObject.NULL} value
*/
public
Object
nextNullValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
NULL_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NULL_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
return
decodeNull
();
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NUMBER_VALUE},
* return the value as a {@code Number}.
* <p>
* The number type returned is one of:</p>
* <ul>
* <li>A {@code Double}</li>
* <li>A {@code Long}</li>
* <li>An {@code Integer}</li>
* <li>A {@code BigDecimal}</li>
* <li>A {@code BigInteger}</li>
* </ul>
* <p>
* This method advances the parser onto the next state.</p>
*
* @return a value that is a subclass of the {@code Number} class
*/
public
Number
nextNumberValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
NUMBER_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NUMBER_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
StringBuilder
sb
=
new
StringBuilder
();
boolean
isDbl
=
lexer
.
nextNumber
(
sb
);
return
decodeNumber
(
sb
.
toString
(),
isDbl
);
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NUMBER_VALUE},
* append the number sequence to the given {@code Appendable}.
* <p>
* This method is suitable for cases where the caller wishes to perform
* their own conversion of number values into a corresponding Object type.
* </p>
* <p>
* This method advances the parser onto the next state.</p>
*
* @param <T> the type of Appendable, returned to the caller
* @param writer the writer to which the number sequence will be written
* @return the given Appendable object
*/
public
<
T
extends
Appendable
>
T
appendNextNumberValue
(
T
writer
)
throws
JSONException
{
if
((
state
!=
ParseState
.
NUMBER_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NUMBER_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
lexer
.
nextNumber
(
writer
);
return
writer
;
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NUMBER_VALUE},
* return the value as a {@code BigDecimal}.
* <p>
* This method advances the parser onto the next state.</p>
*
* @return a number value as a {@code BigDecimal} class
*/
public
BigDecimal
nextBigDecimalValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
NUMBER_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NUMBER_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
StringBuilder
sb
=
new
StringBuilder
();
lexer
.
nextNumber
(
sb
);
return
decodeBigDecimal
(
sb
.
toString
());
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NUMBER_VALUE},
* return the value as a {@code BigInteger}.
* <p>
* If the JSON value is not parseable as a big integer, as defined by the
* JSON grammar, a JSONException will be thrown.</p>
* <p>
* This method advances the parser onto the next state.</p>
*
* @return a number value as a {@code BigInteger} class
*/
public
BigInteger
nextBigIntegerValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
NUMBER_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NUMBER_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
StringBuilder
sb
=
new
StringBuilder
();
boolean
isDbl
=
lexer
.
nextNumber
(
sb
);
return
decodeBigInteger
(
sb
.
toString
(),
isDbl
);
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NUMBER_VALUE},
* return the value as a double.
* <p>
* This method advances the parser onto the next state.</p>
*
* @return a double value
*/
public
double
nextDoubleValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
NUMBER_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NUMBER_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
StringBuilder
sb
=
new
StringBuilder
();
boolean
isDbl
=
lexer
.
nextNumber
(
sb
);
return
decodeDouble
(
sb
.
toString
(),
isDbl
);
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NUMBER_VALUE},
* return the value as an int.
* <p>
* If the JSON value is not parseable as an int, as defined by the JSON
* grammar, a {@code JSONException} will be thrown.</p>
* <p>
* This method advances the parser onto the next state.</p>
*
* @return an int value
*/
public
int
nextIntValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
NUMBER_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NUMBER_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
StringBuilder
sb
=
new
StringBuilder
();
boolean
isDbl
=
lexer
.
nextNumber
(
sb
);
return
decodeInt
(
sb
.
toString
(),
isDbl
);
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* If the {@code ParseState} was {@link ParseState#NUMBER_VALUE},
* return the value as a long.
* <p>
* If the JSON value is not parseable as a long, as defined by the JSON
* grammar, a {@code JSONException} will be thrown.</p>
* <p>
* This method advances the parser onto the next state.</p>
*
* @return a long value
*/
public
long
nextLongValue
()
throws
JSONException
{
if
((
state
!=
ParseState
.
NUMBER_VALUE
) || (
objectStack
.
isEmpty
())) {
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
Token
token
=
objectStack
.
pop
();
if
(
token
==
Token
.
NUMBER_VALUE
) {
state
=
ParseState
.
VALUE_SEPARATOR
;
StringBuilder
sb
=
new
StringBuilder
();
boolean
isDbl
=
lexer
.
nextNumber
(
sb
);
return
decodeLong
(
sb
.
toString
(),
isDbl
);
}
else
{
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
/**
* Get the depth of nested objects, arrays, or values.
*
* @return the depth of nested objects, arrays, or values
*/
public
int
getStackDepth
() {
return
objectStack
.
size
();
}
/**
* Indicates the current position of the scanner.
*
* @return a {@code ParsePosition} representing the current location of
* the scanner
*/
public
ParsePosition
getParsePosition
() {
return
lexer
.
parsePosition
();
}
/**
* An assertive form of {@link #currentState()}, where the intended current
* state is validated against the state that was found.
*
* @param assertState the expected current state
* @throws JSONException an unexpected state was parsed, or there was a
* problem with the source stream
*/
public
void
assertCurrentState
(
ParseState
assertState
)
throws
JSONException
{
if
(
state
!=
assertState
) {
throw
new
JSONParseException
(
"Expected "
+
assertState
+
", got "
+
state
,
lexer
.
parsePosition
());
}
}
/**
* Return the <em>current</em> state of the parser, including any of the
* internal states. Only required in exceptional circumstances.
*
* @return the current {@link ParseState}
*/
public
ParseState
currentState
() {
return
state
;
}
/**
* Skip over the content of the current object or array, including any
* nested objects or arrays.
*
* @return the closing {@code ParseState} of the object or array
*/
public
ParseState
skipToEndStructure
()
throws
JSONException
{
if
(
state
.
isValue
()) {
skipValue
();
}
final
int
stackDepth
=
getStackDepth
();
if
(
stackDepth
==
0
) {
state
=
ParseState
.
END_DOCUMENT
;
}
else
{
switch
(
objectStack
.
peek
()) {
case
START_OBJECT
:
case
START_ARRAY
:
while
(
hasNext
() && (
objectStack
.
size
() >=
stackDepth
)) {
nextState
();
}
break
;
default
:
throw
new
JSONParseException
(
"Invalid state"
,
lexer
.
parsePosition
());
}
}
return
state
;
}
/**
* Decode a number strictly according to the JSON specification.
*
* @param val the String value to be decoded as a number
* @param isDbl {@code true} to indicate the value is a decimal or
* exponent value, otherwise {@code false}
* @return the number represented by the token sequence
*/
protected
Number
decodeNumber
(
String
val
,
boolean
isDbl
)
throws
JSONException
{
if
(
isDbl
) {
try
{
Double
d
=
Double
.
valueOf
(
val
);
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