/**

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

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  * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

  *

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  * 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

  * http://www.netbeans.org/cddl-gplv2.html

  * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

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  * nbbuild/licenses/CDDL-GPL-2-CP.  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. If applicable, add the following below the

  * License Header, with the fields enclosed by brackets [] replaced by

  * your own identifying information:

  * "Portions Copyrighted [year] [name of copyright owner]"

  *

  * Contributor(s):

  *

  * The Original Software is NetBeans. The Initial Developer of the Original

  * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.

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  * If you wish your version of this file to be governed by only the CDDL

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  * 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

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 package org.netbeans.html.json.spi;

 import java.lang.ref.Reference;

 import java.lang.ref.WeakReference;

 import net.java.html.BrwsrCtx;

 import net.java.html.json.ComputedProperty;

 import org.netbeans.html.json.impl.Bindings;

 import org.netbeans.html.json.impl.JSON;

 import org.netbeans.html.json.impl.PropertyBindingAccessor;

 import org.netbeans.html.json.impl.RcvrJSON;

 /** Describes a property when one is asked to

  * bind it

  *

  * @author Jaroslav Tulach

  */

 public abstract class PropertyBinding {

     PropertyBinding() {

     }

     static {

         new PropertyBindingAccessor() {

             @Override

             protected JSONCall newCall(BrwsrCtx ctx, RcvrJSON callback, String headers, String urlBefore, String urlAfter, String method, Object data) {

                 return new JSONCall(ctx, callback, headers, urlBefore, urlAfter, method, data);

             }

             @Override

             protected Bindings bindings(Proto proto, boolean initialize, Object copyFrom) {

                 return initialize ? proto.initBindings(copyFrom) : proto.getBindings();

             }

             @Override

             protected void notifyChange(Proto proto, int propIndex) {

                 proto.onChange(propIndex);

             }

             @Override

             protected Proto findProto(Proto.Type<?> type, Object object) {

                 return type.protoFor(object);

             }

             @Override

             protected <Model> Model cloneTo(Proto.Type<Model> type, Model model, BrwsrCtx c) {

                 return type.cloneTo(model, c);

             }

             @Override

             protected Object read(Proto.Type<?> from, BrwsrCtx c, Object data) {

                 return from.read(c, data);

             }

             @Override

             protected <M> PropertyBinding newBinding(

                 Proto.Type<M> access, Bindings<?> bindings, String name, int index, M model, byte propertyType) {

                 return new Impl(model, bindings, name, index, access, propertyType);

             }

         };

     }

     /** Name of the property this binding represents.

      * @return name of the property

      */

     public abstract String getPropertyName();

     /** Changes value of the property. Can be called only on dedicated

      * thread. See {@link Technology#runSafe(java.lang.Runnable)}.

      *

      * @param v new value of the property

      */

     public abstract void setValue(Object v);

     /** Obtains current value of the property this binding represents.

      * Can be called only on dedicated

      * thread. See {@link Technology#runSafe(java.lang.Runnable)}.

      *

      * @return the value or <code>null</code>

      */

     public abstract Object getValue();

     /** Is this property read only?. Or can one call {@link #setValue(java.lang.Object)}?

      * The property can still change, but only as a result of other

      * properties being changed, just like {@link ComputedProperty} can.

      *

      * @return true, if this property is read only

      */

     public abstract boolean isReadOnly();

     /** Is this property constant?. If a property is constant, than its

      * value cannot changed after it is read.

      *

      * @return true, if this property is constant

      * @since 1.3

      */

     public abstract boolean isConstant();

     /** Returns identical version of the binding, but one that holds on the

      * original model object via weak reference.

      *

      * @return binding that uses weak reference

      * @since 1.1

      */

     public abstract PropertyBinding weak();

     private static abstract class AImpl<M> extends PropertyBinding {

         public final String name;

         public final byte propertyType;

         final Proto.Type<M> access;

         final Bindings<?> bindings;

         final int index;

         public AImpl(Bindings<?> bindings, String name, int index, Proto.Type<M> access, byte propertyType) {

             this.bindings = bindings;

             this.name = name;

             this.index = index;

             this.access = access;

             this.propertyType = propertyType;

         }

         protected abstract M model();

         @Override

         public void setValue(Object v) {

             M model = model();

             if (model == null) {

                 return;

             }

             access.setValue(model, index, v);

         }

         @Override

         public Object getValue() {

             M model = model();

             if (model == null) {

                 return null;

             }

             Object v = access.getValue(model, index);

             Object r = JSON.find(v, bindings);

             return r == null ? v : r;

         }

         @Override

         public boolean isReadOnly() {

             return (propertyType & 1) != 0;

         }

         @Override

         public boolean isConstant() {

             return (propertyType & 2) != 0;

         }

         @Override

         public String getPropertyName() {

             return name;

         }

     } // end of PBData

     private static final class Impl<M> extends AImpl<M> {

         private final M model;

         public Impl(M model, Bindings<?> bindings, String name, int index, Proto.Type<M> access, byte propertyType) {

             super(bindings, name, index, access, propertyType);

             this.model = model;

         }

         @Override

         protected M model() {

             return model;

         }

         @Override

         public PropertyBinding weak() {

             return new Weak(model, bindings, name, index, access, propertyType);

         }

     }

     private static final class Weak<M> extends AImpl<M> {

         private final Reference<M> ref;

         public Weak(M model, Bindings<?> bindings, String name, int index, Proto.Type<M> access, byte propertyType) {

             super(bindings, name, index, access, propertyType);

             this.ref = new WeakReference<M>(model);

         }

         @Override

         protected M model() {

             return ref.get();

         }

         @Override

         public PropertyBinding weak() {

             return this;

         }

     }

 }