json/src/main/java/net/java/html/json/Property.java
author Jaroslav Tulach <jtulach@netbeans.org>
Mon, 22 Feb 2016 06:09:33 +0100
branchNonMutable258088
changeset 1054 4c40ceb185e5
parent 831 e37388a5f7d1
permissions -rw-r--r--
#258088: Introducing @Property(mutable=false) and making sure the generated Java code yields exceptions when such properties are modified after their use by the technology
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/**
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
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 * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.
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 *
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 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
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 * Other names may be trademarks of their respective owners.
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 *
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 * The contents of this file are subject to the terms of either the GNU
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 * General Public License Version 2 only ("GPL") or the Common
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 * Development and Distribution License("CDDL") (collectively, the
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 * "License"). You may not use this file except in compliance with the
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 * License. You can obtain a copy of the License at
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 * http://www.netbeans.org/cddl-gplv2.html
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 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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 * specific language governing permissions and limitations under the
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 * License.  When distributing the software, include this License Header
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 * Notice in each file and include the License file at
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 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the GPL Version 2 section of the License file that
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 * accompanied this code. If applicable, add the following below the
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 * License Header, with the fields enclosed by brackets [] replaced by
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 * your own identifying information:
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 * "Portions Copyrighted [year] [name of copyright owner]"
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 *
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 * Contributor(s):
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 *
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 * The Original Software is NetBeans. The Initial Developer of the Original
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 * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.
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 *
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 * If you wish your version of this file to be governed by only the CDDL
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 * or only the GPL Version 2, indicate your decision by adding
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 * "[Contributor] elects to include this software in this distribution
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 * under the [CDDL or GPL Version 2] license." If you do not indicate a
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 * single choice of license, a recipient has the option to distribute
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 * your version of this file under either the CDDL, the GPL Version 2 or
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 * to extend the choice of license to its licensees as provided above.
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 * However, if you add GPL Version 2 code and therefore, elected the GPL
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 * Version 2 license, then the option applies only if the new code is
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 * made subject to such option by the copyright holder.
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 */
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package net.java.html.json;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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import java.util.List;
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import org.netbeans.html.context.spi.Contexts;
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import org.netbeans.html.json.spi.Technology;
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/** Represents a property in a class defined with {@link Model} annotation.
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 *
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 * @author Jaroslav Tulach
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 */
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@Retention(RetentionPolicy.SOURCE)
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@Target({})
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public @interface Property {
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    /** Name of the property. Will be used to define proper getter and setter
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     * in the associated class.
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     * 
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     * @return valid java identifier
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     */
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    String name();
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    /** Type of the property. Can either be primitive type (like <code>int.class</code>,
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     * <code>double.class</code>, etc.), {@link String}, {@link Enum enum} or complex model
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     * class (defined by {@link Model} property).
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     * 
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     * @return the class of the property
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     */
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    Class<?> type();
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    /** Is this property an array of the {@link #type()} or a single value?
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     * If the property is an array, only its getter (returning mutable {@link List} of
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     * the boxed {@link #type()}) is generated.
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     * 
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     * @return true, if this property is supposed to represent an array of values
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     */
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    boolean array() default false;
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    /** Can the value of the property be mutated without restriction or not.
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     * If a property is defined as <em>not mutable</em>, it defines
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     * semi-immutable value that can only be changed in construction time
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     * before the object is passed to underlying {@link Technology}. 
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     * Attempts to modify the object later yield {@link IllegalStateException}.
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     *
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     * Technologies may decide to represent such non-mutable
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     * property in more effective way - for
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     * example Knockout Java Bindings technology (with {@link Contexts.Id id} "ko4j")
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     * uses plain JavaScript value (number, string, array, boolean) rather
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     * than classical observable.
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     *
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     * @return false if the value cannot change after its <em>first use</em>
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     * @since 1.3
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     */
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    boolean mutable() default true;
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}