JavaScriptObjectHelper.java

package com.cast.gwt.receiver.client;

import java.util.List;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * This class originally from algaforge GWT wrapper around the Google Map API.
 * It has been extended to handle float attributes and other API
 * 
 */
public class JavaScriptObjectHelper
{

	private JavaScriptObjectHelper()
	{

	}

	public static native String getAttribute(JavaScriptObject elem, String attr) /*-{
		var ret = elem[attr];
		return (ret === undefined) ? null : String(ret);
	}-*/;

	public static native void setAttribute(JavaScriptObject elem, String attr,
			String value) /*-{
		elem[attr] = value;
	}-*/;

	public static native JavaScriptObject getAttributeAsJavaScriptObject(
			JavaScriptObject elem, String attr) /*-{
		var ret = elem[attr];
		return (ret === undefined) ? null : ret;
	}-*/;

	public static native JavaScriptObject[] getAttributeAsJavaScriptObjectArray(
			JavaScriptObject elem, String attr) /*-{
		var ret = elem[attr];
		return (ret === undefined) ? null : ret;
	}-*/;

	public static native void setAttribute(JavaScriptObject elem, String attr,
			JavaScriptObject[] value) /*-{
		elem[attr] = value;
	}-*/;

	public static native void setAttribute(JavaScriptObject elem, String attr,
			JavaScriptObject value) /*-{
		elem[attr] = value;
	}-*/;

	public static native void setAttribute(JavaScriptObject elem, String attr,
			int value) /*-{
		elem[attr] = value;
	}-*/;

	public static native void setAttribute(JavaScriptObject elem, String attr,
			boolean value) /*-{
		elem[attr] = value;
	}-*/;

	public static native void setAttribute(JavaScriptObject elem, String attr,
			float value) /*-{
		elem[attr] = value;
	}-*/;

	public static native int getAttributeAsInt(JavaScriptObject elem, String attr) /*-{
		var ret = elem[attr];
		return (ret === undefined) ? null : ret;
	}-*/;

	public static native float getAttributeAsFloat(JavaScriptObject elem,
			String attr) /*-{
		var ret = elem[attr];
		return (ret === undefined) ? null : ret;
	}-*/;

	public static int[] getAttributeAsIntArray(JavaScriptObject elem, String attr)
	{
		int[] rtn = null;
		JavaScriptObject hold = getAttributeAsJavaScriptObject(elem, attr);
		if (hold != null)
		{
			rtn = new int[getJavaScriptObjectArraySize(hold)];

			for (int i = 0; i < rtn.length; i++)
			{
				rtn[i] = getIntValueFromJavaScriptObjectArray(hold, i);
			}
		}

		return rtn;
	}

	public static native int getJavaScriptObjectArraySize(JavaScriptObject elem) /*-{
		if (elem)
			return elem.length;
		return 0;
	}-*/;

	public static native int getIntValueFromJavaScriptObjectArray(
			JavaScriptObject elem, int i) /*-{
		return elem[i];
	}-*/;

	public static native void setAttributeAsIntArray(JavaScriptObject elem,
			String attr, int[] value) /*-{
		elem[attr] = value;
	}-*/;

	public static native boolean getAttributeAsBoolean(JavaScriptObject elem,
			String attr) /*-{
		var ret = elem[attr];
		return (ret === undefined) ? null : ret;
	}-*/;

	/**
	 * Helper function to create [] array from List.
	 * 
	 * @param list
	 * 
	 * @return array of objects
	 */
	public static JavaScriptObject[] listToArray(List list)
	{
		JavaScriptObject[] array = new JavaScriptObject[list.size()];

		for (int i = 0; i < array.length; i++)
		{
			array[i] = (JavaScriptObject) list.get(i);
		}

		return array;
	}

	public static JavaScriptObject arrayConvert(Object[] array)
	{
		JavaScriptObject result = newJSArray(array.length);
		for (int i = 0; i < array.length; i++)
		{
			arraySet(result, i, array[i]);
		}
		return result;
	}

	public static JavaScriptObject arrayConvert(JavaScriptObject[] array)
	{
		JavaScriptObject result = newJSArray(array.length);
		for (int i = 0; i < array.length; i++)
		{
			arraySet(result, i, array[i]);
		}
		return result;
	}

	private static native JavaScriptObject newJSArray(int length) /*-{
		if (length < 0) {
			return new Array();
		} else {
			return new Array(length);
		}
	}-*/;

	public static native int arrayLength(JavaScriptObject array) /*-{
		return array.length;
	}-*/;

	public static native Object arrayGetObject(JavaScriptObject array, int index) /*-{
		return array[index];
	}-*/;

	public static native void arraySet(JavaScriptObject array, int index,
			Object value) /*-{
		array[index] = value;

	}-*/;

	public static native void arraySet(JavaScriptObject array, int index,
			JavaScriptObject value) /*-{
		array[index] = value;

	}-*/;
}