com.emuanalytics.vaadin.enhancedjavascript.client.EnhancedJavaScriptConnectorHelper.java Source code

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Here is the source code for com.emuanalytics.vaadin.enhancedjavascript.client.EnhancedJavaScriptConnectorHelper.java

Source

package com.emuanalytics.vaadin.enhancedjavascript.client;

/*
 * Copyright 2016 Emu Analytics Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.json.client.JSONValue;
import com.vaadin.client.*;
import elemental.json.JsonArray;
import elemental.json.JsonType;
import elemental.json.JsonValue;

public class EnhancedJavaScriptConnectorHelper extends JavaScriptConnectorHelper {

    private final EnhancedJavaScriptComponentConnector connector;
    private final JavaScriptObject stateDeltas = JavaScriptObject.createObject();
    private final JavaScriptObject combinedState = JavaScriptObject.createObject();

    public EnhancedJavaScriptConnectorHelper(EnhancedJavaScriptComponentConnector connector) {
        super(connector);
        this.connector = connector;
    }

    @Override
    protected void showInitProblem(java.util.ArrayList<String> attemptedNames) {
        connector.getWidget().showNoInitFound(attemptedNames);
    }

    @Override
    public JavaScriptObject getConnectorWrapper() {
        JavaScriptObject connWrapper = super.getConnectorWrapper();
        augmentConnectorWrapper(connWrapper, combinedState, stateDeltas, this);
        return connWrapper;
    }

    @Override
    public void setNativeState(JavaScriptObject state) {
        super.setNativeState(state);
        updateCombinedState(combinedState, stateDeltas, state);
    }

    private static native void updateCombinedState(JavaScriptObject combinedState, JavaScriptObject deltas,
            JavaScriptObject input)
    /*-{
      // Clear deltas
      for(var key in deltas) {
    if (deltas.hasOwnProperty(key)) {
      delete deltas[key];
    }
      }
        
      // Update combined state and deltas from input
      for(var key in input) {
    if (input.hasOwnProperty(key)) {
      combinedState[key] = input[key];
      deltas[key] = input[key];
    }
      }
    }-*/;

    private void setDeferredVariableImpl(String name, JsonValue value, boolean immediate) {
        if (value.getType() == JsonType.STRING) {
            connector.getConnection().updateVariable(connector.getConnectorId(), name, value.asString(), immediate);
        } else if (value.getType() == JsonType.BOOLEAN) {
            connector.getConnection().updateVariable(connector.getConnectorId(), name, value.asBoolean(),
                    immediate);
        } else if (value.getType() == JsonType.NUMBER) {
            connector.getConnection().updateVariable(connector.getConnectorId(), name, value.asNumber(), immediate);
        } else {
            // Other types (e.g. array, object) are transmitted to server as a JSON string
            connector.getConnection().updateVariable(connector.getConnectorId(), name, value.toJson(), immediate);
        }
    }

    private static native void augmentConnectorWrapper(JavaScriptObject obj, JavaScriptObject combinedState,
            JavaScriptObject stateDeltas, EnhancedJavaScriptConnectorHelper h)
    /*-{
       var nativeState = obj.getState();
       obj.getStateDeltas = function() { return stateDeltas; }
       obj.getState = function() { return combinedState; }
       obj.setDeferredVariable = function(name, value, immediate) {
    immediate = immediate || false;
    $entry(h.@com.emuanalytics.vaadin.enhancedjavascript.client.EnhancedJavaScriptConnectorHelper::setDeferredVariableImpl(*)).call(h, name, value, immediate);
       };
     }-*/;
}