com.google.web.bindery.autobean.gwt.client.impl.JsniCreatorMap.java Source code

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Here is the source code for com.google.web.bindery.autobean.gwt.client.impl.JsniCreatorMap.java

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/*
 * Copyright 2011 Google Inc.
 * 
 * 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.
 */
package com.google.web.bindery.autobean.gwt.client.impl;

import com.google.web.bindery.autobean.shared.AutoBean;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;

/**
 * Used in prod-mode code to create instances of generated AutoBean subtypes via
 * JSNI references to their constructor methods.
 */
public final class JsniCreatorMap extends JavaScriptObject {
    public static JsniCreatorMap createMap() {
        return JavaScriptObject.createObject().cast();
    }

    /*
     * Structure is a string map of class literal names to the no-arg and one-arg
     * constructors of a generated AutoBean subtype.
     */
    protected JsniCreatorMap() {
    }

    public void add(Class<?> clazz, JsArray<JavaScriptObject> constructors) {
        assert constructors.length() == 2 : "Expecting two constructor references";
        set(clazz.getName(), constructors);
    }

    public <T> AutoBean<T> create(Class<T> clazz, AbstractAutoBeanFactory factory) {
        JsArray<JavaScriptObject> arr = get(clazz.getName());
        if (arr != null && arr.get(0) != null) {
            return invoke(arr.get(0), factory, null);
        }
        return null;
    }

    public <T> AutoBean<T> create(Class<T> clazz, AbstractAutoBeanFactory factory, Object delegate) {
        JsArray<JavaScriptObject> arr = get(clazz.getName());
        if (arr != null) {
            assert arr.get(1) != null : "No delegate-based constructor";
            return invoke(arr.get(1), factory, delegate);
        }
        return null;
    }

    private native JsArray<JavaScriptObject> get(String key) /*-{
                                                             return this[key];
                                                             }-*/;

    private native <T> AutoBean<T> invoke(JavaScriptObject fn, Object arg1, Object arg2)/*-{
                                                                                        return fn(arg1, arg2);
                                                                                        }-*/;

    private native void set(String key, JsArray<JavaScriptObject> arr) /*-{
                                                                       this[key] = arr;
                                                                       }-*/;
}