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  * 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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  * 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.ko4j;

 import net.java.html.js.JavaScriptBody;

 import net.java.html.js.JavaScriptResource;

 import net.java.html.json.Model;

 import org.apidesign.html.json.spi.FunctionBinding;

 import org.apidesign.html.json.spi.PropertyBinding;

 /** This is an implementation package - just

  * include its JAR on classpath and use official {@link Context} API

  * to access the functionality.

  * <p>

  * Provides binding between {@link Model models} and knockout.js running

  * inside a JavaFX WebView. 

  *

  * @author Jaroslav Tulach

  */

 @JavaScriptResource("knockout-2.2.1.js")

 final class Knockout {

     @JavaScriptBody(args = { "model", "prop", "oldValue", "newValue" }, 

         wait4js = false,

         body =

           "if (model) {\n"

         + "  var koProp = model[prop];\n"

         + "  if (koProp && koProp['valueHasMutated']) {\n"

         + "    if ((oldValue !== null || newValue !== null)) {\n"

         + "      koProp['valueHasMutated'](newValue);\n"

         + "    } else if (koProp['valueHasMutated']) {\n"

         + "      koProp['valueHasMutated']();\n"

         + "    }\n"

         + "  }\n"

         + "}\n"

     )

     public native static void valueHasMutated(

         Object model, String prop, Object oldValue, Object newValue

     );

     @JavaScriptBody(args = { "bindings" }, wait4js = false, body = 

         "ko.applyBindings(bindings);\n"

     )

     native static void applyBindings(Object bindings);

     @JavaScriptBody(args = { "cnt" }, body = 

         "var arr = new Array(cnt);\n" +

         "for (var i = 0; i < cnt; i++) arr[i] = new Object();\n" +

         "return arr;\n"

     )

     native static Object[] allocJS(int cnt);

     @JavaScriptBody(

         javacall = true,

         wait4js = false,

         args = {"ret", "model", "propNames", "propReadOnly", "propValues", "propArr", "funcNames", "funcArr"},

         body = 

           "ret['ko-fx.model'] = model;\n"

         + "function koComputed(name, readOnly, value, prop) {\n"

         + "  function realGetter() {\n"

         + "    try {\n"

         + "      var v = prop.@org.apidesign.html.json.spi.PropertyBinding::getValue()();\n"

         + "      return v;\n"

         + "    } catch (e) {\n"

         + "      alert(\"Cannot call getValue on \" + model + \" prop: \" + name + \" error: \" + e);\n"

         + "    }\n"

         + "  }\n"

         + "  var activeGetter = function() { return value; };\n"

         + "  var bnd = {\n"

         + "    'read': function() {\n"

         + "      var r = activeGetter();\n"

         + "      activeGetter = realGetter;\n"

         + "      if (r) try { var br = r.valueOf(); } catch (err) {}\n"

         + "      return br === undefined ? r: br;\n"

         + "    },\n"

         + "    'owner': ret\n"

         + "  };\n"

         + "  if (!readOnly) {\n"

         + "    bnd['write'] = function(val) {\n"

         + "      prop.@org.apidesign.html.json.spi.PropertyBinding::setValue(Ljava/lang/Object;)(val);\n"

         + "    };\n"

         + "  };\n"

         + "  var cmpt = ko['computed'](bnd);\n"

         + "  var vhm = cmpt['valueHasMutated'];\n"

         + "  cmpt['valueHasMutated'] = function(val) {\n"

         + "    if (arguments.length === 1) activeGetter = function() { return val; };\n"

         + "    vhm();\n"

         + "  };\n"

         + "  ret[name] = cmpt;\n"

         + "}\n"

         + "for (var i = 0; i < propNames.length; i++) {\n"

         + "  koComputed(propNames[i], propReadOnly[i], propValues[i], propArr[i]);\n"

         + "}\n"

         + "function koExpose(name, func) {\n"

         + "  ret[name] = function(data, ev) {\n"

         + "    func.@org.apidesign.html.json.spi.FunctionBinding::call(Ljava/lang/Object;Ljava/lang/Object;)(data, ev);\n"

         + "  };\n"

         + "}\n"

         + "for (var i = 0; i < funcNames.length; i++) {\n"

         + "  koExpose(funcNames[i], funcArr[i]);\n"

         + "}\n"

         )

     static native void wrapModel(

         Object ret, Object model,

         String[] propNames, boolean[] propReadOnly, Object propValues, PropertyBinding[] propArr,

         String[] funcNames, FunctionBinding[] funcArr

     );

     @JavaScriptBody(args = { "o" }, body = "return o['ko-fx.model'] ? o['ko-fx.model'] : o;")

     private static native Object toModelImpl(Object wrapper);

     static Object toModel(Object wrapper) {

         return toModelImpl(wrapper);

     }

     @JavaScriptBody(args = {}, body = "if (window.WebSocket) return true; else return false;")

     static final boolean areWebSocketsSupported() {

         return false;

     }

 }