org.waveprotocol.box.webclient.contact.FetchContactsBuilder.java Source code

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Here is the source code for org.waveprotocol.box.webclient.contact.FetchContactsBuilder.java

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/**
 * 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.waveprotocol.box.webclient.contact;

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 org.waveprotocol.box.contact.ContactRequest;
import org.waveprotocol.box.contact.jso.ContactRequestJsoImpl;
import org.waveprotocol.box.contact.jso.ContactResponseJsoImpl;
import org.waveprotocol.box.webclient.contact.FetchContactsService.Callback;
import org.waveprotocol.wave.client.account.impl.AbstractContactManager;
import org.waveprotocol.wave.client.debug.logger.DomLogger;
import org.waveprotocol.wave.common.logging.LoggerBundle;
import org.waveprotocol.wave.communication.gwt.JsonMessage;
import org.waveprotocol.wave.communication.json.JsonException;

/**
 * Helper class to fetch contacts.
 *
 * @author akaplanov@gmail.com (Andrew Kaplanov)
 */
public final class FetchContactsBuilder {
    private static final LoggerBundle LOG = new DomLogger("FetchContactsBuilder");

    /** The base contact URL. */
    private static final String CONTACT_URL_BASE = "/contact";

    /** Holds contact request data. */
    private ContactRequest contactRequest;

    private FetchContactsBuilder() {
    }

    public FetchContactsBuilder setTimestamp(long timestamp) {
        contactRequest.setTimestamp(timestamp);
        return this;
    }

    /** Static factory method */
    public static FetchContactsBuilder create() {
        return new FetchContactsBuilder();
    }

    public FetchContactsBuilder newFetchContactsRequest() {
        contactRequest = ContactRequestJsoImpl.create();
        return this;
    }

    public FetchContactsBuilder setContactsManager(AbstractContactManager contactManager) {
        return this;
    }

    public void fetchContacts(final Callback callback) {
        String url = getUrl(contactRequest);
        LOG.trace().log("Fetching contacts, timestamp " + contactRequest.getTimestamp());

        RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET, url);
        requestBuilder.setCallback(new RequestCallback() {
            @Override
            public void onResponseReceived(Request request, Response response) {
                LOG.trace().log("Contact response received: ", response.getText());
                if (response.getStatusCode() != Response.SC_OK) {
                    callback.onFailure("Got back status code " + response.getStatusCode());
                } else if (!response.getHeader("Content-Type").startsWith("application/json")) {
                    callback.onFailure("Contact service did not return json");
                } else {
                    ContactResponseJsoImpl contactResponse;
                    try {
                        contactResponse = JsonMessage.parse(response.getText());
                    } catch (JsonException e) {
                        callback.onFailure(e.getMessage());
                        return;
                    }
                    callback.onSuccess(contactResponse);
                }
            }

            @Override
            public void onError(Request request, Throwable e) {
                callback.onFailure(e.getMessage());
            }
        });

        try {
            requestBuilder.send();
        } catch (RequestException e) {
            LOG.error().log(e.getMessage());
        }
    }

    private static String getUrl(ContactRequest contactRequest) {
        String params = "?timestamp=" + contactRequest.getTimestamp();
        return CONTACT_URL_BASE + "/" + URL.encode(params);
    }
}