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package com.googlecode.gwt.test.uibinder;

import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.googlecode.gwt.test.GwtCreateHandler;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

/**
 * GwtCreateHandler in charge of creating UiBinder objects through deferred binding, parsing .ui.xml
 * files and binding to java {@link UiField}. For internal use only.
 *
 * @author Gael Lazzari
 */
public class UiBinderCreateHandler implements GwtCreateHandler {

    private static final UiBinderCreateHandler INSTANCE = new UiBinderCreateHandler();

    public static UiBinderCreateHandler get() {
        return INSTANCE;
    }

    private UiBinderCreateHandler() {

    }

    /*
     * (non-Javadoc)
     *
     * @see com.googlecode.gwt.test.GwtCreateHandler#create(java.lang.Class)
     */
    @SuppressWarnings("unchecked")
    public Object create(Class classLiteral) throws Exception {
        if (UiBinder.class.isAssignableFrom(classLiteral)) {
            return createProxy((Class>) classLiteral);
        } else {
            return null;
        }
    }

    private Object createProxy(Class> uiBinderClass) {
        InvocationHandler ih = new UiBinderInvocationHandler(uiBinderClass);

        return Proxy.newProxyInstance(this.getClass().getClassLoader(),
                new Class[]{uiBinderClass}, ih);
    }
}