org.spiffyui.spsample.client.rest.VersionInfo.java Source code

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Here is the source code for org.spiffyui.spsample.client.rest.VersionInfo.java

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/*******************************************************************************
 *
 * Copyright 2011 Spiffy UI Team   
 * 
 * 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.spiffyui.spsample.client.rest;

import org.spiffyui.client.JSONUtil;
import org.spiffyui.client.MessageUtil;
import org.spiffyui.client.rest.RESTCallback;
import org.spiffyui.client.rest.RESTException;
import org.spiffyui.client.rest.RESTObjectCallBack;
import org.spiffyui.client.rest.RESTility;

import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONValue;

/**
 * A bean for holding version info
 */
public final class VersionInfo {
    private static VersionInfo g_versionInfo;

    private String m_version;
    private String m_user;
    private String m_rev;
    private String m_date;
    private String m_revDate;

    private VersionInfo() {

    }

    /**
     * Gets the version
     *
     * @return the version
     */
    public String getVersion() {
        return m_version;
    }

    public String getUser() {
        return m_user;
    }

    public String getRevision() {
        return m_rev;
    }

    public String getDate() {
        return m_date;
    }

    public String getRevDate() {
        return m_revDate;
    }

    private static void createVersionInfo(JSONValue val, RESTObjectCallBack<VersionInfo> callback) {
        JSONObject bi = val.isObject();
        if (bi == null) {
            MessageUtil.showError("An error occurred trying to get version info.");
            return;
        }
        g_versionInfo = new VersionInfo();

        g_versionInfo.m_version = JSONUtil.getStringValue(bi, "version");
        g_versionInfo.m_user = JSONUtil.getStringValue(bi, "user");
        g_versionInfo.m_rev = JSONUtil.getStringValue(bi, "rev");
        g_versionInfo.m_date = JSONUtil.getStringValue(bi, "date");
        g_versionInfo.m_revDate = JSONUtil.getStringValue(bi, "revdate");

        callback.success(g_versionInfo);
    }

    /**
     * Gets the version info from the server
     *
     * @param callback the REST callback
     */
    public static void getVersionInfo(final RESTObjectCallBack<VersionInfo> callback) {
        if (g_versionInfo != null) {
            /*
             The version info doesn't change while the page is still running
             so we can cache it and save an HTTP call.
             */
            callback.success(g_versionInfo);
            return;
        }

        RESTility.callREST("version", new RESTCallback() {
            @Override
            public void onSuccess(JSONValue val) {
                createVersionInfo(val, callback);
            }

            @Override
            public void onError(int statusCode, String errorResponse) {
                callback.error(errorResponse);
            }

            @Override
            public void onError(RESTException e) {
                callback.error(e);
            }
        });
    }
}