TJSONData class

In unit fpJson

Base (abstract) object for all JSON based data types.

Declaration

pascal

TJSONData = class(TObject)

Inheritance

TJSONData
TObject

Descends from it: TJSONArray TJSONBoolean TJSONNull TJSONNumber TJSONObject TJSONString

Description

TJSONData is an abstract class which introduces all properties and methods needed to work with JSON-based data. It should never be instantiated. Based on the type of data that must be represented one of the following descendents must be instantiated instead.

Numbers: must be represented using one of TJSONIntegerNumber, TJSONFloatNumber or TJSONInt64Number, depending on the type of the number.
Strings: can be represented with TJSONString.
Boolean: can be represented with TJSONBoolean.
null: is supported using TJSONNull
Array: data can be represented using TJSONArray
Object: data can be supported using TJSONObject

Properties

`CompressedJSON`	public	Compress JSON - skip whitespace.
`Count`	public	Number of sub-items for this data element.
`Items`	public	Indexed access to sub-items.
`Value`	public	The value of this data object as a variant.
`AsString`	public	Access the raw JSON value as a string.
`AsUnicodeString`	public	Return the value as a Unicode string.
`AsInt64`	public	Access the raw JSON value as an 64-bit integer.
`AsQWord`	public	Access the raw JSON value as an 64-bit unsigned integer.
`AsLargeInt`	public	Access to data as largeint.
`AsFloat`	public	Access the raw JSON value as a float.
`AsInteger`	public	Access the raw JSON value as an 32-bit integer.
`AsBoolean`	public	Access the raw JSON value as a boolean.
`IsNull`	public	Is the data a null value ?
`AsJSON`	public	Return a JSON representation of the value.

Methods

`DoError`	protected
`DoFindPath`	protected
`GetAsBoolean`	protected
`GetAsFloat`	protected
`GetAsInteger`	protected
`GetIsNull`	protected
`GetAsInt64`	protected
`GetAsQWord`	protected
`GetAsUnicodeString`	protected
`SetAsInt64`	protected
`SetAsQword`	protected
`SetAsUnicodeString`	protected
`SetAsBoolean`	protected
`SetAsFloat`	protected
`SetAsInteger`	protected
`GetAsJSON`	protected
`GetAsString`	protected
`SetAsString`	protected
`GetValue`	protected
`SetValue`	protected
`GetItem`	protected
`SetItem`	protected
`DoFormatJSON`	protected
`GetCount`	protected
`JSONType`	public	The native JSON data type represented by this object.
`Create`	public	Create a new instance of TJSONData.
`Clear`	public	Clear the raw value of this data object.
`DumpJSON`	public	Fast, memory efficient dump of JSON in stream.
`GetEnumerator`	public	Return an enumerator for the data.
`FindPath`	public	Find data by name.
`GetPath`	public	Get data by name.
`Clone`	public	Duplicate the value of the JSON data.
`FormatJSON`	public	Return a formatted JSON representation of the data.

Types and constants

TFormatJSONContext protected

Inherited

From TObject (41)

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An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.