/*
* Smart GWT (GWT for SmartClient)
* Copyright 2008 and beyond, Isomorphic Software, Inc.
*
* Smart GWT is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3
* is published by the Free Software Foundation. Smart GWT is also
* available under typical commercial license terms - see
* http://smartclient.com/license
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package com.smartgwt.client.bean.types;
import com.google.gwt.core.client.JavaScriptObject;
import com.smartgwt.client.bean.BeanValueType;
import com.smartgwt.client.bean.BeanValueType.Convertability;
import com.smartgwt.client.data.DataSource;
import com.smartgwt.client.bean.types.JsoWrapperValueType;
import java.util.Map;
// This value type is for DataSources and subclasses, which can be converted
// from Strings (where the String is expected to be the ID of the DataSource).
public abstract class DataSourceBaseValueType<ValueType extends DataSource> extends JsoWrapperValueType<ValueType> {
@Override
public Convertability convertabilityFrom (Object value) {
if (value instanceof String) {
return Convertability.SUPPORTED;
}
return super.convertabilityFrom(value);
}
@Override
public String getScClassName () {
// JavaScriptObjects must descend from DataSource to be wrapped
return "DataSource";
}
private native JavaScriptObject getJSDataSource (String id) /*-{
return $wnd.isc.DataSource.get(id);
}-*/;
@Override
public ValueType convertFrom (Object value) {
if (value instanceof String) {
// We could just call DataSource.get(value), and that would work
// fine for methods that literally take a DataSource. However, if
// there ever was a method that took a subclass of DataSource
// (which there won't be in SmartGWT itself, but could conceivably
// be in client code), then we wouldn't return the right subclass.
// So, we get the JavaScript datasource, and then recursively
// convert that ... since we do know how to produce the correct
// subclass given a JavaScriptObject.
return super.convertFrom(getJSDataSource((String) value));
} else {
return super.convertFrom(value);
}
}
}