UpdatingContentEditWidget.java

package com.psddev.cms.tool;

import java.io.IOException;
import java.util.Collection;

public abstract class UpdatingContentEditWidget extends ContentEditWidget {

    /**
     * @return Nullable.
     */
    public Collection<Class<? extends UpdatingContentEditWidget>> getUpdateDependencies() {
        return null;
    }

    /**
     * @param page Nonnull.
     * @param content Nonnull.
     * @param placement {@code null} on update.
     */
    public abstract void displayOrUpdate(ToolPageContext page, Object content, ContentEditWidgetPlacement placement) throws IOException;

    @Override
    public final void display(ToolPageContext page, Object content, ContentEditWidgetPlacement placement) throws IOException {
        displayOrUpdate(page, content, placement);
    }
}