com.tasktop.c2c.server.profile.web.ui.client.place.AppPlaceController.java Source code

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Here is the source code for com.tasktop.c2c.server.profile.web.ui.client.place.AppPlaceController.java

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/*******************************************************************************
 * Copyright (c) 2010, 2012 Tasktop Technologies
 * Copyright (c) 2010, 2011 SpringSource, a division of VMware
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Tasktop Technologies - initial API and implementation
 ******************************************************************************/
package com.tasktop.c2c.server.profile.web.ui.client.place;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.place.shared.Place;
import com.google.gwt.place.shared.PlaceChangeEvent;
import com.google.gwt.place.shared.PlaceChangeRequestEvent;
import com.google.gwt.place.shared.PlaceController;
import com.google.gwt.place.shared.PlaceHistoryMapper;
import com.google.gwt.user.client.History;
import com.google.inject.Inject;
import com.tasktop.c2c.server.common.profile.web.client.place.IPlace;
import com.tasktop.c2c.server.profile.web.ui.client.gin.AppGinjector;

/**
 * @author straxus (Tasktop Technologies Inc.)
 * @author cmorgan
 * 
 */
public class AppPlaceController extends PlaceController {

    private final EventBus eventBus;
    private final Delegate delegate;
    private Place where = Place.NOWHERE;
    private Place goingTo = null;

    private PlaceHistoryMapper placeHistoryMapper;

    @Inject
    public AppPlaceController(EventBus eventBus) {
        this(eventBus, (Delegate) GWT.create(DefaultDelegate.class));
    }

    public AppPlaceController(EventBus eventBus, Delegate delegate) {
        super(eventBus, delegate);
        this.eventBus = eventBus;
        this.delegate = delegate;
        placeHistoryMapper = AppGinjector.get.instance().getPlaceHistoryMapper();
    }

    /**
     * Returns the current place.
     * 
     * @return a {@link Place} instance
     */
    @Override
    public Place getWhere() {
        return where;
    }

    @Override
    public void goTo(Place newPlace) {

        // NOTE : In contrast to the super impl, we will go to places we are already at. This is because places fetch
        // data so the same place may be different on subsequent views.

        boolean willContinue = maybeGoTo(newPlace);

        if (willContinue) {
            goingTo = newPlace;
            continueGo(newPlace);
        }
    }

    private void continueGo(Place newPlace) {
        if (newPlace instanceof IPlace) {
            IPlace place = (IPlace) newPlace;

            if (place.isReadyToGo()) {
                finishGo(newPlace);
            } else {
                place.go();
            }
        } else {
            finishGo(newPlace);
        }
    }

    public void finishGo(Place newPlace) {
        goingTo = null;
        where = newPlace;
        eventBus.fireEvent(new PlaceChangeEvent(newPlace));
    }

    private boolean maybeGoTo(Place newPlace) {
        if (goingTo != null && goingTo == newPlace) {
            return true;
        }

        PlaceChangeRequestEvent willChange = new PlaceChangeRequestEvent(newPlace);
        eventBus.fireEvent(willChange);
        String warning = willChange.getWarning();

        if (warning == null || delegate.confirm(warning)) {
            return true;
        } else {
            // Keep url in sync when cancled
            History.newItem(placeHistoryMapper.getToken(getWhere()), false);
            return false;
        }
    }
}