FormPanelPatcher.java

package com.googlecode.gwt.test.internal.patchers;

import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
import com.google.gwt.user.client.ui.impl.FormPanelImpl;
import com.googlecode.gwt.test.exceptions.GwtTestException;
import com.googlecode.gwt.test.exceptions.GwtTestPatchException;
import com.googlecode.gwt.test.patchers.PatchClass;
import com.googlecode.gwt.test.patchers.PatchMethod;
import com.googlecode.gwt.test.utils.GwtReflectionUtils;

import java.lang.reflect.Constructor;

@PatchClass(FormPanel.class)
class FormPanelPatcher {

    @PatchMethod
    static void submit(FormPanel formPanel) {
        FormPanel.SubmitEvent event = new FormPanel.SubmitEvent();
        formPanel.fireEvent(event);
        if (!event.isCanceled()) {
            FormPanelImpl impl = GwtReflectionUtils.getPrivateFieldValue(formPanel, "impl");
            Element synthesizedFrame = GwtReflectionUtils.getPrivateFieldValue(formPanel,
                    "synthesizedFrame");
            FormPanel.SubmitCompleteEvent completeEvent = createCompleteSubmitEvent(getResultsHtml(impl, synthesizedFrame));
            formPanel.fireEvent(completeEvent);
        }

    }

    private static SubmitCompleteEvent createCompleteSubmitEvent(String resultsHtml) {
        try {
            Constructor<SubmitCompleteEvent> ctor = SubmitCompleteEvent.class.getDeclaredConstructor(String.class);
            return GwtReflectionUtils.instantiateClass(ctor, resultsHtml);
        } catch (Exception e) {
            if (GwtTestException.class.isInstance(e)) {
                throw (GwtTestException) e;
            } else {
                throw new GwtTestPatchException("Error while trying to instanciate "
                        + SubmitCompleteEvent.class.getName() + " class", e);
            }
        }
    }

    private static String getResultsHtml(FormPanelImpl impl, Element synthesizedFrame) {
        if (synthesizedFrame != null) {
            return impl.getContents(synthesizedFrame);
        } else {
            return null;
        }
    }

}