## org.codehaus.groovy.grails.web.json
Class JSONWriter

    java.lang.Object
      org.codehaus.groovy.grails.web.json.JSONWriter

Direct Known Subclasses:
  PathCapturingJSONWriterWrapper, PrettyPrintJSONWriter

    public class JSONWriter

extends Object

JSONWriter provides a quick and convenient way of producing JSON text. The texts produced strictly conform to JSON syntax rules. No whitespace is added, so the results are ready for transmission or storage. Each instance of JSONWriter can produce one JSON text.

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.

Version:
  2
Author:
  JSON.org

Nested Class Summary
`protected static class` `JSONWriter.Mode` Enumeration of the possible modes of the JSONWriter

Field Summary
`protected boolean` `comma` The comma flag determines if a comma should be output before the next value.
`protected JSONWriter.Mode` `mode` The current mode.
`protected Writer` `writer` The writer that will receive the output.

Constructor Summary
`JSONWriter(Writer w)` Make a fresh JSONWriter.

Method Summary
`protected JSONWriter` `append(String s)` Append a value.
`JSONWriter` `array()` Begin appending a new array.
`protected void` `comma()`
`protected JSONWriter` `end(JSONWriter.Mode m, char c)` End something.
`JSONWriter` `endArray()` End an array.
`JSONWriter` `endObject()` End an object.
`JSONWriter` `key(String s)` Append a key.
`JSONWriter` `object()` Begin appending a new object.
`protected void` `pop(JSONWriter.Mode c)` Pop an array or object scope.
`protected void` `push(JSONWriter.Mode c)` 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(Object o)` Append an object value.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### comma

    protected boolean comma

  The comma flag determines if a comma should be output before the next value.

### mode

    protected JSONWriter.Mode mode

  The current mode. Values:

### writer

    protected Writer writer

  The writer that will receive the output.

Constructor Detail

### JSONWriter

    public JSONWriter(Writer w)

  Make a fresh JSONWriter. It can be used to build one JSON text.

Method Detail

### append

    protected JSONWriter append(String s)

  Append a value.

  Parameters:
    `s` - A string value.
  Returns:
    this

### comma

    protected void comma()

### array

    public JSONWriter array()

  Begin appending a new array. All values until the balancing `endArray` will be appended to this array. The `endArray` method must be called to mark the array's end.

  Returns:
    this

### end

    protected JSONWriter end(JSONWriter.Mode m,
                             char c)

  End something.

  Parameters:
    `m` - Mode
    `c` - Closing character
  Returns:
    this

### endArray

    public JSONWriter endArray()

  End an array. This method most be called to balance calls to `array`.

  Returns:
    this

### endObject

    public JSONWriter endObject()

  End an object. This method most be called to balance calls to `object`.

  Returns:
    this

### key

    public JSONWriter key(String s)

  Append a key. The key will be associated with the next value. In an object, every value must be preceded by a key.

  Parameters:
    `s` - A key string.
  Returns:
    this

### object

    public JSONWriter object()

  Begin appending a new object. All keys and values until the balancing `endObject` will be appended to this object. The `endObject` method must be called to mark the object's end.

  Returns:
    this

### pop

    protected void pop(JSONWriter.Mode c)

  Pop an array or object scope.

  Parameters:
    `c` - The scope to close.

### push

    protected void push(JSONWriter.Mode c)

  Push an array or object scope.

  Parameters:
    `c` - The scope to open.

### value

    public JSONWriter value(boolean b)

  Append either the value `true` or the value `false`.

  Parameters:
    `b` - A boolean.
  Returns:
    this

### value

    public JSONWriter value(double d)

  Append a double value.

  Parameters:
    `d` - A double.
  Returns:
    this

### value

    public JSONWriter value(long l)

  Append a long value.

  Parameters:
    `l` - A long.
  Returns:
    this

### value

    public JSONWriter value(Object o)

  Append an object value.

  Parameters:
    `o` - The object to append. It can be null, or a Boolean, Number, String, JSONObject, or JSONArray.
  Returns:
    this

Copyright (c) 2005-2009 The Grails project