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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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  * 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

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  * Contributor(s):

  *

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

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

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  * However, if you add GPL Version 2 code and therefore, elected the GPL

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 package org.apidesign.html.json.spi;

 import java.util.Collection;

 import java.util.List;

 import net.java.html.BrwsrCtx;

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

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

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

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

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

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  * @since 0.7

  */

 public final class Proto {

     private final Object obj;

     private final Type type;

     private final net.java.html.BrwsrCtx context;

     private boolean locked;

     private org.netbeans.html.json.impl.Bindings ko;

     Proto(Object obj, Type type, BrwsrCtx context) {

         this.obj = obj;

         this.type = type;

         this.context = context;

     }

     public BrwsrCtx getContext() {

         return context;

     }

     public void acquireLock() throws IllegalStateException {

         if (locked) throw new IllegalStateException();

         locked = true;

     }

     public void checkLock() throws IllegalStateException {

         if (locked) throw new IllegalStateException();

     }

     public void releaseLock() {

         locked = false;

     }

     public void valueHasMutated(String propName) {

         if (ko != null) {

             ko.valueHasMutated(propName);

         }

     }

     public void applyBindings() {

         initBindings().applyBindings();

     }

     public void runInBrowser(Runnable run) {

         JSON.runInBrowser(context, run);

     }

     public void initTo(Collection<?> to, Object array) {

         if (ko != null) {

             throw new IllegalStateException();

         }

         if (to instanceof JSONList) {

            ((JSONList)to).init(array);

         } else {

             JSONList.init(to, array);

         }

     }

     public void extract(Object json, String[] props, Object[] values) {

         JSON.extract(context, json, props, values);

     }

     public <T> T read(Class<T> modelClass, Object data) {

         return JSON.read(context, modelClass, data);

     }

     // XXX: Don't expose internal type

     public Bindings initBindings() {

         if (ko == null) {

             Bindings b = Bindings.apply(context, obj);

             PropertyBinding[] pb = new PropertyBinding[type.propertyNames.length];

             for (int i = 0; i < pb.length; i++) {

                 pb[i] = b.registerProperty(

                     type.propertyNames[i], i, obj, type, type.propertyReadOnly[i]

                 );

             }

             FunctionBinding[] fb = new FunctionBinding[type.functions.length];

             for (int i = 0; i < fb.length; i++) {

                 fb[i] = FunctionBinding.registerFunction(

                     type.functions[i], i, obj, type

                 );

             }

             ko = b;

             b.finish(obj, pb, fb);

         }

         return ko;

     }

     // XXX: Don't expose internal type

     public Bindings getBindings() {

         return ko;

     }

     // XXX: Can be hidden too

     public void onChange(int index) {

         type.onChange(obj, index);

     }

     public void loadJSON(final int index, 

         String urlBefore, String urlAfter, String method,

         final Object data

     ) {

         class Rcvr extends RcvrJSON {

             @Override

             protected void onMessage(MsgEvnt msg) {

                 type.onMessage(obj, index, 1, msg.getValues());

             }

             @Override

             protected void onError(MsgEvnt msg) {

                 type.onMessage(obj, index, 2, msg.getException());

             }

         }

         JSON.loadJSON(context, new Rcvr(), urlBefore, urlAfter, method, data);

     }

     public String toString(Object data, String propName) {

         return JSON.toString(context, data, propName);

     }

     public Number toNumber(Object data, String propName) {

         return JSON.toNumber(context, data, propName);

     }

     public <T> T toModel(Class<T> type, Object data, String propName) {

         return JSON.toModel(context, type, data, propName);

     }

     public <T> List<T> createList(String propName, int onChange, String... dependingProps) {

         return new JSONList<T>(this, propName, onChange, dependingProps);

     }

     public <T> void cloneList(Collection<T> to, BrwsrCtx ctx, Collection<T> from) {

         Boolean isModel = null;

         for (T t : from) {

             if (isModel == null) {

                 isModel = JSON.isModel(t.getClass());

             }

             if (isModel) {

                 to.add(JSON.bindTo(t, ctx));

             } else {

                 to.add(t);

             }

         }

     }

     /** Functionality used by the code generated by annotation

      * processor for the {@link net.java.html.json.Model} annotation.

      * 

      * @param <Model> the generated class

      * @since 0.7

      */

     public static abstract class Type<Model> {

         private final Class<Model> clazz;

         private final String[] propertyNames;

         private final boolean[] propertyReadOnly;

         private final String[] functions;

         protected Type(

             Class<Model> clazz, Class<?> modelFor, int properties, int functions

         ) {

             assert getClass().getName().endsWith("$Html4JavaType");

             assert getClass().getDeclaringClass() == clazz;

             this.clazz = clazz;

             this.propertyNames = new String[properties];

             this.propertyReadOnly = new boolean[properties];

             this.functions = new String[functions];

             JSON.register(clazz, this);

         }

         protected final void registerProperty(String name, int index, boolean readOnly) {

             assert propertyNames[index] == null;

             propertyNames[index] = name;

             propertyReadOnly[index] = readOnly;

         }

         protected final void registerFunction(String name, int index) {

             assert functions[index] == null;

             functions[index] = name;

         }

         public Proto protoFor(Object obj, BrwsrCtx context) {

             return new Proto(obj, this, context);

         }

         // XXX: should be protected

         public abstract void setValue(Model model, int index, Object value);

         public abstract Object getValue(Model model, int index);

         public abstract void call(Model model, int index, Object data, Object event);

         public abstract Model cloneTo(Object model, BrwsrCtx ctx);

         public abstract Model read(BrwsrCtx c, Object json);

         public abstract void onChange(Model model, int index);

         public abstract Proto protoFor(Object object);

         /**

          * 

          * @param model

          * @param index

          * @param type 0 - onOpen, 1 - onMessage, 2 - onError, 3 - onClose

          * @param data 

          */

         public abstract void onMessage(Model model, int index, int type, Object data);

         public <T> void copyJSON(BrwsrCtx context, Object[] src, Class<T> destType, T[] dest) {

             for (int i = 0; i < src.length && i < dest.length; i++) {

                 dest[i] = org.netbeans.html.json.impl.JSON.read(context, destType, src[i]);

             }

         }

         //

         // Various support methods the generated classes use

         //

         /** Compares two objects that can be converted to integers.

          * @return true if they are the same

          */

         public final boolean isSame(int a, int b) {

             return a == b;

         }

         /** Compares two objects that can be converted to (floating point)

          * numbers.

          * @return  true if they are the same

          */

         public final boolean isSame(double a, double b) {

             return a == b;

         }

         /** Compares two objects for being the same - e.g. either <code>==</code>

          * or <code>equals</code>.

          * @return true if they are equals

          */ 

         public final boolean isSame(Object a, Object b) {

             if (a == b) {

                 return true;

             }

             if (a == null || b == null) {

                 return false;

             }

             return a.equals(b);

         }

         /** Cumulative hash function. Adds hashcode of the object to the

          * previous value.

          * @param o the object (or <code>null</code>)

          * @param h the previous value of the hash

          * @return new hash - the old one xor the object's one

          */

         public final int hashPlus(Object o, int h) {

             return o == null ? h : h ^ o.hashCode();

         }

         /** Converts an object to its JSON value.

          * 

          * @param obj the object to convert

          * @return JSON representation of the object

          */

         public final String toJSON(Object obj) {

             return JSON.toJSON(obj);

         }

         /** Converts the value to string.

          * 

          * @param val the value

          * @return the converted value

          */

         public final String stringValue(Object val) {

             return JSON.stringValue(val);

         }

         /** Converts the value to number.

          * 

          * @param val the value

          * @return the converted value

          */

         public final Number numberValue(Object val) {

             return JSON.numberValue(val);

         }

         /** Converts the value to character.

          * 

          * @param val the value

          * @return the converted value

          */

         public final Character charValue(Object val) {

             return JSON.charValue(val);

         }

         /** Converts the value to boolean.

          * 

          * @param val the value

          * @return the converted value

          */

         public final Boolean boolValue(Object val) {

             return JSON.boolValue(val);

         }

         /** Extracts value of specific type from given object.

          * 

          * @param <T> the type of object one is interested in

          * @param type the type

          * @param val the object to convert to type

          * @return the converted value

          */

         public final <T> T extractValue(Class<T> type, Object val) {

             if (Number.class.isAssignableFrom(type)) {

                 val = numberValue(val);

             }

             if (Boolean.class == type) {

                 val = boolValue(val);

             }

             if (String.class == type) {

                 val = stringValue(val);

             }

             if (Character.class == type) {

                 val = charValue(val);

             }

             if (Integer.class == type) {

                 val = val instanceof Number ? ((Number) val).intValue() : 0;

             }

             if (Long.class == type) {

                 val = val instanceof Number ? ((Number) val).longValue() : 0;

             }

             if (Short.class == type) {

                 val = val instanceof Number ? ((Number) val).shortValue() : 0;

             }

             if (Byte.class == type) {

                 val = val instanceof Number ? ((Number) val).byteValue() : 0;

             }

             if (Double.class == type) {

                 val = val instanceof Number ? ((Number) val).doubleValue() : Double.NaN;

             }

             if (Float.class == type) {

                 val = val instanceof Number ? ((Number) val).floatValue() : Float.NaN;

             }

             return type.cast(val);

         }

     }

 }