n3phele.client.presenter.AccountListActivity.java Source code

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Here is the source code for n3phele.client.presenter.AccountListActivity.java

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/**
 * @author Nigel Cook
 *
 * (C) Copyright 2010-2012. Nigel Cook. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Licensed under the terms described in LICENSE file that accompanied this code, (the "License"); you may not use this file
 * except in compliance with the License. 
 * 
 *  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 n3phele.client.presenter;

import java.util.List;

import n3phele.client.AppPlaceHistoryMapper;
import n3phele.client.CacheManager;
import n3phele.client.ClientFactory;
import n3phele.client.model.Account;
import n3phele.client.model.Collection;
import n3phele.client.presenter.helpers.AuthenticatedRequestFactory;
import n3phele.client.view.AccountListView;

import com.google.gwt.activity.shared.AbstractActivity;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.ui.AcceptsOneWidget;

public class AccountListActivity extends AbstractActivity {
    private EventBus eventBus;
    private final AppPlaceHistoryMapper historyMapper;
    private final AccountListView display;
    private List<Account> accountList = null;
    private final CacheManager cacheManager;
    private String accountCollection;
    private HandlerRegistration handlerRegistration;

    public AccountListActivity(String accountUri, ClientFactory factory) {

        this.historyMapper = factory.getHistoryMapper();
        this.display = factory.getAccountListView();
        this.cacheManager = factory.getCacheManager();
        this.accountCollection = URL.encode(factory.getCacheManager().ServiceAddress + "account");
    }

    @Override
    public void start(AcceptsOneWidget panel, EventBus eventBus) {
        this.eventBus = eventBus;
        handlerRegistration(eventBus);
        display.setPresenter(this);
        panel.setWidget(display);
        display.setDisplayList(this.accountList);
        //      getClouds();
        getAccountList();
    }

    @Override
    public String mayStop() {
        return null;
    }

    @Override
    public void onCancel() {
        unregister();
    }

    @Override
    public void onStop() {
        this.display.setDisplayList(null);
        unregister();
    }

    //   protected void updateClouds(List<Cloud> list) {
    //      display.setClouds(list); 
    //   }

    protected void updateAccountList(List<Account> list) {
        this.accountList = list;
        display.refresh(this.accountList);
    }

    public void goToPrevious() {
        History.back();
    }

    public void handlerRegistration(EventBus eventBus) {
        this.handlerRegistration = this.eventBus.addHandler(AccountListUpdate.TYPE,
                new AccountListUpdateEventHandler() {
                    @Override
                    public void onMessageReceived(AccountListUpdate event) {
                        getAccountList();
                    }
                });
        CacheManager.EventConstructor change = new CacheManager.EventConstructor() {
            @Override
            public AccountListUpdate newInstance(String key) {
                return new AccountListUpdate();
            }
        };
        cacheManager.register(cacheManager.ServiceAddress + "account", "accountList", change);

    }

    protected void unregister() {
        cacheManager.unregister(cacheManager.ServiceAddress + "account", "accountList");
    }

    /*
     * Data Handling
     * -------------
     */

    public void getAccountList() {
        // Send request to server and catch any errors.
        RequestBuilder builder = AuthenticatedRequestFactory.newRequest(RequestBuilder.GET, accountCollection);
        try {
            Request request = builder.sendRequest(null, new RequestCallback() {
                public void onError(Request request, Throwable exception) {
                    // displayError("Couldn't retrieve JSON "+exception.getMessage());
                }

                public void onResponseReceived(Request request, Response response) {
                    GWT.log("Got reply");
                    if (200 == response.getStatusCode()) {
                        Collection<Account> account = Account.asCollection(response.getText());
                        updateAccountList(account.getElements());
                    } else {

                    }
                }

            });
        } catch (RequestException e) {
            //displayError("Couldn't retrieve JSON "+e.getMessage());
        }
    }

    //   protected void getClouds() {
    //      this.eventBus.addHandler(CacheManager.CloudListUpdate.TYPE, new CacheManager.CloudListUpdateEventHandler() {
    //         @Override
    //         public void onMessageReceived(CacheManager.CloudListUpdate event) {
    //            updateClouds(cacheManager.getClouds());
    //         }
    //      });
    //      updateClouds(cacheManager.getClouds());
    //   }

    public void onSelect(Account selected) {
        History.newItem(historyMapper.getToken(new AccountPlace(selected.getUri())));

    }

    /*
     * Event Definition
     * ----------------
     */
    public interface AccountListUpdateEventHandler extends EventHandler {
        void onMessageReceived(AccountListUpdate commandListUpdate);
    }

    public static class AccountListUpdate extends GwtEvent<AccountListUpdateEventHandler> {
        public static Type<AccountListUpdateEventHandler> TYPE = new Type<AccountListUpdateEventHandler>();

        public AccountListUpdate() {
        }

        @Override
        public com.google.gwt.event.shared.GwtEvent.Type<AccountListUpdateEventHandler> getAssociatedType() {
            return TYPE;
        }

        @Override
        protected void dispatch(AccountListUpdateEventHandler handler) {
            handler.onMessageReceived(this);
        }
    }

}