/*
* Ext GWT 2.2.4 - Ext for GWT
* Copyright(c) 2007-2010, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
package com.extjs.gxt.ui.client.js;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.extjs.gxt.ui.client.data.ModelData;
import com.extjs.gxt.ui.client.util.Params;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.user.client.Element;
/**
* JavaScript related methods.
*/
public class JsUtil {
/**
* Creates a new javascript object from the JSON text.
*
* @param code the JSON text
* @return the new javascript object
*/
public static native JavaScriptObject eval(String code) /*-{
var x = eval(code);
return x[0];
}-*/;
/**
* Returns <code>true</code> if the value is a integer.
*
* @param value the value to test
* @return the integer state
*/
public static boolean isInteger(String value) {
try {
Integer.parseInt(value);
return true;
} catch (Exception e) {
return false;
}
}
/**
* Returns a section of the given list.
*
* @param list the list
* @param start the start index
* @param end the end index
* @return the sub list
*/
public static <X> List<X> subList(List<X> list, int start, int end) {
List<X> temp = new ArrayList<X>();
for (int i = start; i < end; i++) {
temp.add(list.get(i));
}
return temp;
}
/**
* Converts a native javascript array to an element array.
*
* @param jsArray the array to be converted
* @return the element array
*/
public static Element[] toElementArray(JavaScriptObject jsArray) {
Element[] elems = new Element[getLength(jsArray)];
for (int i = 0; i < elems.length; i++) {
elems[i] = getElement(jsArray, i);
}
return elems;
}
/**
* Converts a object array to a javascript array.
*
* @param array the java array
* @return the new javascript array
*/
public static JavaScriptObject toJavaScriptArray(Object[] array) {
JsArray jsArray = new JsArray();
for (int i = 0; i < array.length; i++) {
jsArray.add(array[i]);
}
return jsArray.getJsObject();
}
/**
* Converts a map into a javascript object, setting all values as properties.
* Map keys must be strings.
*
* @param params the parameters
* @return the new javascript object
*/
public static <V> JavaScriptObject toJavaScriptObject(Map<String, V> params) {
JsObject obj = new JsObject();
Iterator<String> keys = params.keySet().iterator();
while (keys.hasNext()) {
String k = keys.next();
Object v = params.get(k);
if (v instanceof Params) {
v = ((Params) v).getValues();
} else if (v instanceof ModelData) {
v = new Params(((ModelData) v).getProperties()).getValues();
}
obj.set(k, v);
}
return obj.getJsObject();
}
/**
* Returns the element at the specified index.
*
* @param jsArray the javascript array
* @param index the index
* @return the element
*/
private static native Element getElement(JavaScriptObject jsArray, int index) /*-{
return jsArray[index];
}-*/;
/**
* Returns the length of a javascript array.
*
* @param jsArray the natvie element
*
* @return the array length
*/
private static native int getLength(JavaScriptObject jsArray) /*-{
return jsArray.length;
}-*/;
}