Java tutorial
/* * Copyright 2013~2014 Dan Haywood * * 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 org.isisaddons.wicket.gmap3.cpt.ui; import java.util.List; import javax.inject.Inject; import com.google.common.base.Optional; import com.google.common.collect.Iterables; import com.google.common.collect.Lists; import org.apache.wicket.AttributeModifier; import org.apache.wicket.Page; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.behavior.AttributeAppender; import org.apache.wicket.markup.ComponentTag; import org.apache.wicket.markup.head.IHeaderResponse; import org.apache.wicket.request.mapper.parameter.PageParameters; import org.apache.wicket.request.resource.ResourceReference; import org.wicketstuff.gmap.GMap; import org.wicketstuff.gmap.api.GEvent; import org.wicketstuff.gmap.api.GEventHandler; import org.wicketstuff.gmap.api.GIcon; import org.wicketstuff.gmap.api.GLatLng; import org.wicketstuff.gmap.api.GMarker; import org.wicketstuff.gmap.api.GMarkerOptions; import org.apache.isis.core.metamodel.adapter.ObjectAdapter; import org.apache.isis.core.runtime.system.context.IsisContext; import org.apache.isis.viewer.wicket.model.models.EntityCollectionModel; import org.apache.isis.viewer.wicket.model.models.EntityModel; import org.apache.isis.viewer.wicket.model.models.ImageResourceCache; import org.apache.isis.viewer.wicket.model.models.PageType; import org.apache.isis.viewer.wicket.ui.pages.PageClassRegistry; import org.apache.isis.viewer.wicket.ui.panels.PanelAbstract; import org.apache.isis.viewer.wicket.ui.panels.PanelUtil; import org.isisaddons.wicket.gmap3.cpt.applib.Locatable; import org.isisaddons.wicket.gmap3.cpt.applib.Location; import org.isisaddons.wicket.gmap3.cpt.applib.LocationDereferencingService; public class CollectionOfEntitiesAsLocatables extends PanelAbstract<EntityCollectionModel> { private static final long serialVersionUID = 1L; private static final String INVISIBLE_CLASS = "collection-contents-as-locatables-invisible"; private static final String ID_MAP = "map"; private final String apiKey; public CollectionOfEntitiesAsLocatables(final String id, final String apiKey, final EntityCollectionModel model) { super(id, model); this.apiKey = apiKey; buildGui(); } private void buildGui() { final EntityCollectionModel model = getModel(); final List<ObjectAdapter> adapterList = model.getObject(); final Optional<ObjectAdapter> firstIfAny = Iterables.tryFind(adapterList, input -> { GLatLng latLng = asGLatLng((Locatable) input.getObject()); return latLng != null; }); final boolean visible = firstIfAny.isPresent(); final GMap map = new GMap(ID_MAP, apiKey) { @Override protected void onComponentTag(final ComponentTag tag) { super.onComponentTag(tag); if (!visible) { final AttributeModifier modifier = new AttributeAppender("class", " " + INVISIBLE_CLASS); tag.addBehavior(modifier); } } }; map.setStreetViewControlEnabled(true); map.setScaleControlEnabled(true); map.setPanControlEnabled(true); map.setDoubleClickZoomEnabled(true); if (firstIfAny.isPresent()) { // centre the map on the first object that has a location. final ObjectAdapter first = firstIfAny.get(); map.setCenter(asGLatLng((Locatable) first.getObject())); } addOrReplace(map); addMarkers(map, adapterList); } private void addMarkers(final GMap map, List<ObjectAdapter> adapterList) { List<GLatLng> glatLngsToShow = Lists.newArrayList(); for (ObjectAdapter adapter : adapterList) { ObjectAdapter dereferencedAdapter = dereference(adapter); final GMarker gMarker = createGMarker(map, adapter, dereferencedAdapter); if (gMarker != null) { map.addOverlay(gMarker); addClickListener(gMarker, dereferencedAdapter); glatLngsToShow.add(gMarker.getLatLng()); } } map.fitMarkers(glatLngsToShow); } private ObjectAdapter dereference(final ObjectAdapter adapterForLocatable) { final LocationDereferencingService locationDereferencingService = IsisContext.getSessionFactory() .getServicesInjector().lookupService(LocationDereferencingService.class); if (locationDereferencingService == null) { return adapterForLocatable; } final Object dereferencedObject = locationDereferencingService.dereference(adapterForLocatable.getObject()); return IsisContext.getSessionFactory().getCurrentSession().getPersistenceSession() .adapterFor(dereferencedObject); } private GMarker createGMarker(GMap map, ObjectAdapter adapter, final ObjectAdapter dereferencedAdapter) { GMarkerOptions markerOptions = buildMarkerOptions(map, adapter, dereferencedAdapter); if (markerOptions == null) return null; return new GMarker(markerOptions); } private GMarkerOptions buildMarkerOptions(GMap map, ObjectAdapter adapter, final ObjectAdapter dereferencedAdapter) { final Locatable locatable = (Locatable) adapter.getObject(); final ResourceReference imageResource = determineImageResource(adapter); final String urlFor = (String) urlFor(imageResource, new PageParameters()); @SuppressWarnings("unused") final GIcon gicon = new GIcon(urlFor); GLatLng gLatLng = asGLatLng(locatable); if (gLatLng == null) { return null; } final GMarkerOptions markerOptions = new GMarkerOptions(map, gLatLng, dereferencedAdapter.titleString(null)) .draggable(false); return markerOptions; } private GLatLng asGLatLng(Locatable locatable) { final Location location = locatable.getLocation(); return location != null ? new GLatLng(location.getLatitude(), location.getLongitude()) : null; } private ResourceReference determineImageResource(ObjectAdapter adapter) { ResourceReference imageResource = null; if (adapter != null) { imageResource = imageResourceCache.resourceReferenceFor(adapter); } return imageResource; } private void addClickListener(final GMarker gMarker, ObjectAdapter adapter) { final Class<? extends Page> pageClass = pageClassRegistry.getPageClass(PageType.ENTITY); final PageParameters pageParameters = EntityModel.createPageParameters(adapter); gMarker.addListener(GEvent.click, new GEventHandler() { private static final long serialVersionUID = 1L; @Override public void onEvent(AjaxRequestTarget target) { setResponsePage(pageClass, pageParameters); } }); } @Override protected void onModelChanged() { buildGui(); } @Override public void renderHead(IHeaderResponse response) { super.renderHead(response); PanelUtil.renderHead(response, CollectionOfEntitiesAsLocatables.class); } @Inject ImageResourceCache imageResourceCache; @Inject PageClassRegistry pageClassRegistry; }