/*
 * Copyright 2000-2016 Vaadin Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.vaadin.server;

import java.util.EventObject;

import com.vaadin.shared.VaadinUriResolver;
import com.vaadin.ui.UI;

/**
 * Base class providing common functionality used in different bootstrap
 * modification events.
 *
 * @author Vaadin Ltd
 * @since 7.0.0
 */
public abstract class BootstrapResponse extends EventObject {
    private final VaadinRequest request;
    private final VaadinSession session;
    private final Class<? extends UI> uiClass;
    private final UIProvider uiProvider;
    private VaadinUriResolver uriResolver;

    /**
     * Creates a new bootstrap event.
     *
     * @param handler
     *            the bootstrap handler that is firing the event
     * @param request
     *            the Vaadin request for which the bootstrap page should be
     *            generated
     * @param session
     *            the session for which the bootstrap page should be generated
     * @param uiClass
     *            the class of the UI that will be displayed on the page
     * @param uiProvider
     *            the UI provider for the bootstrap
     */
    public BootstrapResponse(BootstrapHandler handler, VaadinRequest request,
            VaadinSession session, Class<? extends UI> uiClass,
            UIProvider uiProvider) {
        super(handler);
        this.request = request;
        this.session = session;
        this.uiClass = uiClass;
        this.uiProvider = uiProvider;
    }

    /**
     * Gets the bootstrap handler that fired this event.
     *
     * @return the bootstrap handler that fired this event
     */
    public BootstrapHandler getBootstrapHandler() {
        return (BootstrapHandler) getSource();
    }

    /**
     * Gets the request for which the generated bootstrap HTML will be the
     * response.
     *
     * This can be used to read request headers and other additional
     * information. Please note that {@link VaadinSession#getBrowser()} will not
     * be available because the bootstrap page is generated before the bootstrap
     * javascript has had a chance to send any information back to the server.
     *
     * @return the Vaadin request that is being handled
     */
    public VaadinRequest getRequest() {
        return request;
    }

    /**
     * Gets the service session to which the rendered view belongs.
     *
     * @return the Vaadin service session
     */
    public VaadinSession getSession() {
        return session;
    }

    /**
     * Gets the class of the UI that will be displayed on the generated
     * bootstrap page.
     *
     * @return the class of the UI
     */
    public Class<? extends UI> getUiClass() {
        return uiClass;
    }

    /**
     * Gets the UI provider that is used to provide information about the
     * bootstrapped UI.
     *
     * @return the UI provider
     */
    public UIProvider getUIProvider() {
        return uiProvider;
    }

    /**
     * Sets the URI resolver used in the bootstrap process.
     *
     * @param uriResolver
     *            the uri resolver which is used
     * @since 8.1
     */
    public void setUriResolver(VaadinUriResolver uriResolver) {
        assert this.uriResolver == null : "URI resolver should never be changed";
        assert uriResolver != null : "URI resolver should never be null";
        this.uriResolver = uriResolver;
    }

    /**
     * Gets the URI resolver used in the bootstrap process.
     *
     * @return the URI resolver
     * @since 8.1
     */
    public VaadinUriResolver getUriResolver() {
        return uriResolver;
    }

}