public class JSONWriter
extends java.lang.Object
A JSONWriter instance provides a value
method for appending
values to the
text, and a key
method for adding keys before values in objects. There are array
and endArray
methods that make and bound array values, and
object
and endObject
methods which make and bound
object values. All of these methods return the JSONWriter instance,
permitting a cascade style. For example,
new JSONWriter(myWriter) .object() .key("JSON") .value("Hello, World!") .endObject();which writes
{"JSON":"Hello, World!"}
The first method called must be array
or object
.
There are no methods for adding commas or colons. JSONWriter adds them for
you. Objects and arrays can be nested up to 20 levels deep.
This can sometimes be easier than using a JSONObject to build a string.
Modifier and Type | Field and Description |
---|---|
private boolean |
comma
The comma flag determines if a comma should be output before the next
value.
|
private static int |
maxdepth |
protected char |
mode
The current mode.
|
private JSONObject[] |
stack
The object/array stack.
|
private int |
top
The stack top index.
|
protected java.io.Writer |
writer
The writer that will receive the output.
|
Constructor and Description |
---|
JSONWriter(java.io.Writer w)
Make a fresh JSONWriter.
|
Modifier and Type | Method and Description |
---|---|
private JSONWriter |
append(java.lang.String string)
Append a value.
|
JSONWriter |
array()
Begin appending a new array.
|
private JSONWriter |
end(char mode,
char c)
End something.
|
JSONWriter |
endArray()
End an array.
|
JSONWriter |
endObject()
End an object.
|
JSONWriter |
key(java.lang.String string)
Append a key.
|
JSONWriter |
object()
Begin appending a new object.
|
private void |
pop(char c)
Pop an array or object scope.
|
private void |
push(JSONObject jo)
Push an array or object scope.
|
JSONWriter |
value(boolean b)
Append either the value
true or the value
false . |
JSONWriter |
value(double d)
Append a double value.
|
JSONWriter |
value(long l)
Append a long value.
|
JSONWriter |
value(java.lang.Object object)
Append an object value.
|
private static final int maxdepth
private boolean comma
protected char mode
private final JSONObject[] stack
private int top
protected java.io.Writer writer
public JSONWriter(java.io.Writer w)
private JSONWriter append(java.lang.String string) throws JSONException
string
- A string value.JSONException
- If the value is out of sequence.public JSONWriter array() throws JSONException
endArray
will be appended to this array. The
endArray
method must be called to mark the array's end.JSONException
- If the nesting is too deep, or if the object is
started in the wrong place (for example as a key or after the end of the
outermost array or object).private JSONWriter end(char mode, char c) throws JSONException
mode
- Modec
- Closing characterJSONException
- If unbalanced.public JSONWriter endArray() throws JSONException
array
.JSONException
- If incorrectly nested.public JSONWriter endObject() throws JSONException
object
.JSONException
- If incorrectly nested.public JSONWriter key(java.lang.String string) throws JSONException
string
- A key string.JSONException
- If the key is out of place. For example, keys
do not belong in arrays or if the key is null.public JSONWriter object() throws JSONException
endObject
will be appended to this object. The
endObject
method must be called to mark the object's end.JSONException
- If the nesting is too deep, or if the object is
started in the wrong place (for example as a key or after the end of the
outermost array or object).private void pop(char c) throws JSONException
c
- The scope to close.JSONException
- If nesting is wrong.private void push(JSONObject jo) throws JSONException
jo
- The scope to open.JSONException
- If nesting is too deep.public JSONWriter value(boolean b) throws JSONException
true
or the value
false
.b
- A boolean.JSONException
public JSONWriter value(double d) throws JSONException
d
- A double.JSONException
- If the number is not finite.public JSONWriter value(long l) throws JSONException
l
- A long.JSONException
public JSONWriter value(java.lang.Object object) throws JSONException
object
- The object to append. It can be null, or a Boolean, Number,
String, JSONObject, or JSONArray, or an object that implements JSONString.JSONException
- If the value is out of sequence.