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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2011-2017 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://oss.oracle.com/licenses/CDDL+GPL-1.1
* or LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
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();
}