Java tutorial
/******************************************************************************* * * 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.spiffyforms.client; import java.util.ArrayList; import java.util.Date; 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.http.client.URL; import com.google.gwt.json.client.JSONArray; import com.google.gwt.json.client.JSONObject; import com.google.gwt.json.client.JSONString; import com.google.gwt.json.client.JSONValue; /** * This class is our RESTBean for managing users. It handles create, read, update, and * delete of users from the server. This class encapsulates all of the REST functions * of our application and is responsible for turning JSON data into a Java object. */ class User { private String m_firstName = ""; private String m_lastName = ""; private String m_email = ""; private String m_password = ""; private Date m_bDay = null; private String m_userDesc = ""; private String m_userId = ""; private String m_gender = "male"; private boolean m_isNew = true; public String getFirstName() { return m_firstName; } public void setFirstName(String s) { m_firstName = s; } public String getLastName() { return m_lastName; } public void setLastName(String s) { m_lastName = s; } public String getEmail() { return m_email; } public void setEmail(String s) { m_email = s; } public String getPassword() { return m_password; } public void setPassword(String s) { m_password = s; } public String getUserDesc() { return m_userDesc; } public void setUserDesc(String s) { m_userDesc = s; } public Date getBirthday() { return m_bDay; } public void setBirthday(Date d) { m_bDay = d; } public String getUserId() { return m_userId; } public void setUserId(String id) { m_userId = id; } public String getGender() { return m_gender; } public void setGender(String gender) { m_gender = gender; } public boolean isNew() { return m_isNew; } /** * Get the list of users from the server * * @param callback the callback for getting the list of users */ public static void getUsers(final RESTObjectCallBack<User[]> callback) { RESTility.callREST("api/users", new RESTCallback() { @Override public void onSuccess(JSONValue val) { JSONArray usersArray = val.isArray(); ArrayList<User> users = new ArrayList<User>(); for (int i = 0; i < usersArray.size(); i++) { if (usersArray.get(i).isNull() != null) { continue; } User u = new User(); u.setFirstName(JSONUtil.getStringValue(usersArray.get(i).isObject(), "firstName")); u.setLastName(JSONUtil.getStringValue(usersArray.get(i).isObject(), "lastName")); u.setPassword(JSONUtil.getStringValue(usersArray.get(i).isObject(), "password")); u.setUserId(JSONUtil.getStringValue(usersArray.get(i).isObject(), "userID")); u.setEmail(JSONUtil.getStringValue(usersArray.get(i).isObject(), "email")); u.setUserDesc(JSONUtil.getStringValue(usersArray.get(i).isObject(), "desc")); u.setGender(JSONUtil.getStringValue(usersArray.get(i).isObject(), "gender")); u.setBirthday(JSONUtil.getDateValue(usersArray.get(i).isObject(), "birthday")); u.m_isNew = false; users.add(u); } callback.success(users.toArray(new User[users.size()])); } @Override public void onError(int statusCode, String errorResponse) { callback.error(errorResponse); } @Override public void onError(RESTException e) { callback.error(e); } }); } /** * Save the specified user to the server. This method handles new users as well as updating * existing users. * * @param callback the callback to get the status of the save operation */ public void save(final RESTObjectCallBack<Boolean> callback) { JSONObject user = new JSONObject(); user.put("firstName", new JSONString(getFirstName())); user.put("lastName", new JSONString(getLastName())); user.put("email", new JSONString(getEmail())); user.put("birthday", new JSONString("" + getBirthday().getTime())); user.put("desc", new JSONString(getUserDesc())); user.put("gender", new JSONString(getGender())); user.put("password", new JSONString(getPassword())); user.put("userID", new JSONString(getUserId())); RESTility.HTTPMethod m = RESTility.PUT; if (m_isNew) { /* If this user has never been saved then we need to use a POST instead of a PUT */ m = RESTility.POST; } RESTility.callREST(getURIForID(getUserId()), user.toString(), m, new RESTCallback() { @Override public void onSuccess(JSONValue val) { m_isNew = false; callback.success(Boolean.TRUE); } @Override public void onError(int statusCode, String errorResponse) { callback.error(errorResponse); } @Override public void onError(RESTException e) { callback.error(e); } }); } /** * Delete this user from the server. * * @param callback the callback to indicate the success of the delete call */ public void delete(final RESTObjectCallBack<Boolean> callback) { RESTility.callREST(getURIForID(getUserId()), null, RESTility.DELETE, new RESTCallback() { @Override public void onSuccess(JSONValue val) { callback.success(Boolean.TRUE); } @Override public void onError(int statusCode, String errorResponse) { MessageUtil.showError("Error. Status Code: " + statusCode + " " + errorResponse); } @Override public void onError(RESTException e) { MessageUtil.showError(e.getReason()); } }); } /** * This is a helper function to determine if the specified username is in use. It makes * a GET call to get the specified user information and returns true if the username is * already used and false otherwise. * * @param callback the callback * @param username the username to check */ public static void isUsernameInUse(final RESTObjectCallBack<Boolean> callback, String username) { RESTility.callREST(getURIForID(username), new RESTCallback() { @Override public void onSuccess(JSONValue val) { callback.success(Boolean.TRUE); } @Override public void onError(int statusCode, String errorResponse) { callback.error(errorResponse); } @Override public void onError(RESTException e) { if (e.getCode().equals("Not Found")) { /* Then our username doesn't exist on the server which means the name isn't in use. */ callback.success(Boolean.FALSE); } else { callback.error(e); } } }); } private static String getURIForID(String userid) { return "api/users/" + URL.encodePathSegment(userid); } }