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package javax.json;
/**
* JsonValue represents an immutable JSON value.
*
*
* 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 = Json.createObjectBuilder().build();
/**
* The empty JSON array.
*
* @since 1.1
*/
static final JsonArray EMPTY_JSON_ARRAY = Json.createArrayBuilder().build();
/**
* 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();
}