Package: org.grails.web.json

## [Java] Class JSONWriter

- org.grails.web.json.JSONWriter

-     public class JSONWriter
      extends java.lang.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.
  Authors:
    JSON.org
  Version:
    2

- - ### Nested Class Summary

    Nested classes
    Modifiers | Name | Description
    --- | --- | ---
    `protected enum` | `JSONWriter.Mode` | Enumeration of the possible modes of the JSONWriter
    `private static class` | `JSONWriter.NullWritable` |
    `private static class` | `JSONWriter.QuotedWritable` |
    `private static class` | `JSONWriter.WritableString` |

  - ### Field Summary

    Fields
    Modifiers | Name | Description
    --- | --- | ---
    `protected boolean` | `comma` | The comma flag determines if a comma should be output before the next value.
    `protected Mode` | `mode` | The current mode.
    `static groovy.lang.Writable` | `nullWritable` |
    `private java.util.Stack<Mode>` | `stack` | The Mode stack.
    `protected java.io.Writer` | `writer` | The writer that will receive the output.

  - ### Constructor Summary

    Constructors
    Constructor and description
    `JSONWriter (java.io.Writer w)` Make a fresh JSONWriter.

  - ### Methods Summary

    Methods
    Type Params | Return Type | Name and description
    --- | --- | ---
    `` | `protected JSONWriter` | `append(java.lang.String s)` Append a value.
    `` | `protected JSONWriter` | `append(groovy.lang.Writable writableValue)`
    `` | `public JSONWriter` | `array()` Begin appending a new array.
    `` | `protected void` | `comma()`
    `` | `protected JSONWriter` | `end(Mode m, char c)` End something.
    `` | `public JSONWriter` | `endArray()` End an array.
    `` | `public JSONWriter` | `endObject()` End an object.
    `` | `public JSONWriter` | `key(java.lang.String s)` Append a key.
    `` | `public JSONWriter` | `object()` Begin appending a new object.
    `` | `protected void` | `pop(Mode c)` Pop an array or object scope.
    `` | `protected void` | `push(Mode c)` Push an array or object scope.
    `` | `public JSONWriter` | `value(boolean b)` Append either the value `true` or the value `false`.
    `` | `public JSONWriter` | `value(double d)` Append a double value.
    `` | `public JSONWriter` | `value(long l)` Append a long value.
    `` | `public JSONWriter` | `value(java.lang.Number number)` Append a number value
    `` | `public JSONWriter` | `value(java.lang.Object o)` Append an object value.
    `` | `public JSONWriter` | `valueNull()`

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `class java.lang.Object` | `java.lang.Object#wait(long), java.lang.Object#wait(long, int), java.lang.Object#wait(), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll()`

- - ### Field Detail

    - #### protected boolean comma

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

    - #### protected Mode mode

      The current mode. Values:

    - #### static groovy.lang.Writable nullWritable

    - #### private java.util.Stack<Mode> stack

      The Mode stack.

    - #### protected java.io.Writer writer

      The writer that will receive the output.

  - ### Constructor Detail

    - #### public JSONWriter(java.io.Writer w)

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

  - ### Method Detail

    - #### protected JSONWriter append(java.lang.String s)

      Append a value.

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

    - #### protected JSONWriter append(groovy.lang.Writable writableValue)

    - #### 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

    - #### protected void comma()

    - #### protected JSONWriter end(Mode m, char c)

      End something.

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

    - #### public JSONWriter endArray()

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

      Returns:
        this

    - #### public JSONWriter endObject()

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

      Returns:
        this

    - #### public JSONWriter key(java.lang.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

    - #### 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

    - #### protected void pop(Mode c)

      Pop an array or object scope.

      Parameters:
        `c` - The scope to close.

    - #### protected void push(Mode c)

      Push an array or object scope.

      Parameters:
        `c` - The scope to open.

    - #### public JSONWriter value(boolean b)

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

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

    - #### public JSONWriter value(double d)

      Append a double value.

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

    - #### public JSONWriter value(long l)

      Append a long value.

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

    - #### public JSONWriter value(java.lang.Number number)

      Append a number value

      Parameters:
        number
      Returns:

    - #### public JSONWriter value(java.lang.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

    - #### public JSONWriter valueNull()