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package javax.json;
/**
* <code>JsonValue</code> represents an immutable JSON value.
*
*
* <p>A JSON value is one of the following:
* an object ({@link JsonObject}), an array ({@link JsonArray}),
* a number ({@link JsonNumber}), a string ({@link JsonString}),
* {@code true} ({@link JsonValue#TRUE JsonValue.TRUE}), {@code false}
* ({@link JsonValue#FALSE JsonValue.FALSE}),
* or {@code null} ({@link JsonValue#NULL JsonValue.NULL}).
*/
public interface
JsonValue {
/**
* The empty JSON object.
*
* @since 1.1
*/
static final
JsonObject EMPTY_JSON_OBJECT = new
EmptyObject();
/**
* The empty JSON array.
*
* @since 1.1
*/
static final
JsonArray EMPTY_JSON_ARRAY = new
EmptyArray();
/**
* Indicates the type of a {@link JsonValue} object.
*/
enum
ValueType {
/**
* JSON array.
*/
ARRAY,
/**
* JSON object.
*/
OBJECT,
/**
* JSON string.
*/
STRING,
/**
* JSON number.
*/
NUMBER,
/**
* JSON true.
*/
TRUE,
/**
* JSON false.
*/
FALSE,
/**
* JSON null.
*/
NULL
}
/**
* JSON null value.
*/
static final
JsonValue NULL = new
JsonValueImpl(
ValueType.
NULL);
/**
* JSON true value.
*/
static final
JsonValue TRUE = new
JsonValueImpl(
ValueType.
TRUE);
/**
* JSON false value.
*/
static final
JsonValue FALSE = new
JsonValueImpl(
ValueType.
FALSE);
/**
* Returns the value type of this JSON value.
*
* @return JSON value type
*/
ValueType getValueType();
/**
* Return the JsonValue as a JsonObject
*
* @return the JsonValue as a JsonObject
* @throws ClassCastException if the JsonValue is not a JsonObject
*
* @since 1.1
*/
default
JsonObject asJsonObject() {
return
JsonObject.class.
cast(this);
}
/**
* Return the JsonValue as a JsonArray
*
* @return the JsonValue as a JsonArray
* @throws ClassCastException if the JsonValue is not a JsonArray
*
* @since 1.1
*/
default
JsonArray asJsonArray() {
return
JsonArray.class.
cast(this);
}
/**
* Returns JSON text for this JSON value.
*
* @return JSON text
*/
@
Override
String toString();
}