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org.wicketstuff.whiteboard.WhiteboardBehavior Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.wicketstuff.whiteboard;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.BlockingDeque;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.LinkedBlockingDeque;
import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AbstractDefaultAjaxBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.json.JSONArray;
import org.apache.wicket.ajax.json.JSONException;
import org.apache.wicket.ajax.json.JSONObject;
import org.apache.wicket.markup.head.CssHeaderItem;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.markup.head.PriorityHeaderItem;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.protocol.ws.WebSocketSettings;
import org.apache.wicket.protocol.ws.api.IWebSocketConnection;
import org.apache.wicket.protocol.ws.api.registry.IWebSocketConnectionRegistry;
import org.apache.wicket.request.Url;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.http.WebRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wicketstuff.whiteboard.elements.CircleGeneral;
import org.wicketstuff.whiteboard.elements.Circle_3p;
import org.wicketstuff.whiteboard.elements.ClipArt;
import org.wicketstuff.whiteboard.elements.Element;
import org.wicketstuff.whiteboard.elements.Element.Type;
import org.wicketstuff.whiteboard.elements.LineGeneral;
import org.wicketstuff.whiteboard.elements.Line_2p;
import org.wicketstuff.whiteboard.elements.PencilArrow;
import org.wicketstuff.whiteboard.elements.PencilCircle;
import org.wicketstuff.whiteboard.elements.PencilCurve;
import org.wicketstuff.whiteboard.elements.PencilFreeLine;
import org.wicketstuff.whiteboard.elements.PencilPointAtRect;
import org.wicketstuff.whiteboard.elements.PencilPointer;
import org.wicketstuff.whiteboard.elements.PencilRect;
import org.wicketstuff.whiteboard.elements.PencilUnderline;
import org.wicketstuff.whiteboard.elements.PointAtCircle;
import org.wicketstuff.whiteboard.elements.PointAtLine;
import org.wicketstuff.whiteboard.elements.PointFree;
import org.wicketstuff.whiteboard.elements.Point_2c;
import org.wicketstuff.whiteboard.elements.Point_2l;
import org.wicketstuff.whiteboard.elements.Point_lc;
import org.wicketstuff.whiteboard.elements.Segment;
import org.wicketstuff.whiteboard.elements.Text;
import org.wicketstuff.whiteboard.resource.GoogStyleSheetResourceReference;
import org.wicketstuff.whiteboard.resource.TranslateJavaScriptResourceReference;
import org.wicketstuff.whiteboard.resource.WhiteboardHelperJavaScriptResourceReference;
import org.wicketstuff.whiteboard.resource.WhiteboardJavaScriptResourceReference;
import org.wicketstuff.whiteboard.resource.WhiteboardStyleSheetResourceReference;
import org.wicketstuff.whiteboard.settings.WhiteboardLibrarySettings;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
/**
* This class is the behaviour handler of the whiteboard. All the server-side functionality of whiteboard is handled
* here
*
* @author andunslg
*/
public class WhiteboardBehavior extends AbstractDefaultAjaxBehavior {
private static final Map whiteboardMap = new ConcurrentHashMap();
private static final Logger log = LoggerFactory.getLogger(WhiteboardBehavior.class);
private static final long serialVersionUID = 1L;
private String whiteboardMarkupId;
private String whiteboardObjectId;
private Map elementMap;
private Map loadedElementMap;
private BlockingDeque> undoSnapshots;
private BlockingDeque> undoSnapshotCreationList;
private List snapShot = null;
private List snapShotCreation = null;
private DateFormat dateFormat = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
private ArrayList clipArts;
private String clipArtFolder;
private Map> docMap;
private String documentFolder;
private Background background;
private BlockingDeque undoSnapshots_Background;
private BlockingDeque undoSnapshotCreationList_Background;
private BlockingDeque isElementSnapshotList;
private String loadedContent = "";
/**
* Creating the behaviour using whiteboard's html element id
*
* @param whiteboardMarkupId
*/
public WhiteboardBehavior(String whiteboardObjectId, String whiteboardMarkupId) {
this(whiteboardObjectId, whiteboardMarkupId, null, null, null);
}
/**
* This is the constructor which used to create a whiteboard behaviour with more features
*
* @param whiteboardMarkupId
* html element id which holds the whiteboard
* @param whiteboardContent
* If loading from a saved whiteboard file, content should be provided as a string. Otherwise null
* @param clipArtFolder
* Path of the folder which holds clipArts which can be added to whiteboard. Relative to context root
* @param documentFolder
* Path of the folder which holds docs images which can be added to whiteboard. Relative to context root
*/
public WhiteboardBehavior(String whiteboardObjectId, String whiteboardMarkupId, String whiteboardContent,
String clipArtFolder, String documentFolder) {
super();
this.whiteboardObjectId = whiteboardObjectId;
this.whiteboardMarkupId = whiteboardMarkupId;
if (!whiteboardMap.containsKey(whiteboardObjectId)) {
elementMap = new ConcurrentHashMap();
loadedElementMap = new ConcurrentHashMap();
undoSnapshots = new LinkedBlockingDeque>(20);
undoSnapshotCreationList = new LinkedBlockingDeque>(20);
undoSnapshots_Background = new LinkedBlockingDeque(20);
undoSnapshotCreationList_Background = new LinkedBlockingDeque(20);
isElementSnapshotList = new LinkedBlockingDeque(20);
clipArts = new ArrayList();
docMap = new ConcurrentHashMap>();
loadedContent = whiteboardContent;
WhiteboardData whiteboardData = new WhiteboardData(elementMap, loadedElementMap, undoSnapshots,
undoSnapshotCreationList, undoSnapshots_Background, undoSnapshotCreationList_Background,
isElementSnapshotList, clipArts, null, docMap, null, null, whiteboardContent);
whiteboardMap.put(whiteboardObjectId, whiteboardData);
} else {
WhiteboardData whiteboardData = whiteboardMap.get(whiteboardObjectId);
elementMap = whiteboardData.getElementMap();
loadedElementMap = whiteboardData.getLoadedElementMap();
undoSnapshots = whiteboardData.getUndoSnapshots();
undoSnapshotCreationList = whiteboardData.getUndoSnapshotCreationList();
clipArts = whiteboardData.getClipArts();
docMap = whiteboardData.getDocMap();
this.clipArtFolder = whiteboardData.getClipArtFolder();
this.documentFolder = whiteboardData.getDocumentFolder();
background = whiteboardData.getBackground();
loadedContent = whiteboardData.getLoadedContent();
undoSnapshots_Background = whiteboardData.getUndoSnapshots_Background();
undoSnapshotCreationList_Background = whiteboardData.getUndoSnapshotCreationList_Background();
isElementSnapshotList = whiteboardData.getIsElementSnapshotList();
}
if (!"".equals(loadedContent)) {
whiteboardMap.get(whiteboardObjectId).setLoadedContent(loadedContent);
if (whiteboardContent != null && !whiteboardContent.equals("")) {
try {
JSONObject savedContent = new JSONObject(whiteboardContent);
JSONArray elementList = (JSONArray) savedContent.get("elements");
snapShot = new ArrayList();
snapShotCreation = new ArrayList();
for (int i = 0; i < elementList.length(); i++) {
JSONObject jElement = (JSONObject) elementList.get(i);
Element element = getElementObject(jElement);
if (element != null) {
elementMap.put(element.getId(), element);
loadedElementMap.put(element.getId(), element);
snapShot.add(element);
snapShotCreation.add(true);
}
}
if (undoSnapshots.isEmpty()) {
undoSnapshots.addLast(snapShot);
undoSnapshotCreationList.addLast(snapShotCreation);
isElementSnapshotList.addLast(true);
}
snapShot = null;
snapShotCreation = null;
if (savedContent.has("background")) {
JSONObject backgroundJSON = (JSONObject) savedContent.get("background");
background = new Background(backgroundJSON);
whiteboardMap.get(whiteboardObjectId).setBackground(background);
undoSnapshots_Background.addLast(new Background("Background", "", 0.0, 0.0, 0.0, 0.0));
undoSnapshotCreationList_Background.addLast(true);
isElementSnapshotList.addLast(false);
}
} catch (JSONException e) {
log.error("Unexpected error while constructing WhiteboardBehavior", e);
}
}
}
// Setting the path to clipArt folder
if (clipArtFolder != null && !clipArtFolder.equals("")) {
this.clipArtFolder = clipArtFolder;
whiteboardMap.get(whiteboardObjectId).setClipArtFolder(clipArtFolder);
this.loadClipArts();
}
// Setting the path to documents folder
if (documentFolder != null && !documentFolder.equals("")) {
this.documentFolder = documentFolder;
whiteboardMap.get(whiteboardObjectId).setDocumentFolder(documentFolder);
this.loadDocuments();
}
}
/**
* This method handles all the Ajax calls coming from whiteboard
*
* @param target
*/
protected void respond(final AjaxRequestTarget target) {
RequestCycle cycle = RequestCycle.get();
WebRequest webRequest = (WebRequest) cycle.getRequest();
// If geometric element is drawn of edited on whiteboard, message will be sent and this if clause handles that
if (webRequest.getQueryParameters().getParameterNames().contains("editedElement")) {
String editedElement = webRequest.getQueryParameters().getParameterValue("editedElement").toString();
handleEditedElement(editedElement);
}
// If undo button is clicked on whiteboard, message will be sent and this if clause handles that
else if (webRequest.getQueryParameters().getParameterNames().contains("undo")) {
handleUndo();
}
// If eraseAll button is clicked on whiteboard, message will be sent and this if clause handles that
else if (webRequest.getQueryParameters().getParameterNames().contains("eraseAll")) {
handleEraseAll();
}
// If save button is clicked on whiteboard, message will be sent and this if clause handles that
else if (webRequest.getQueryParameters().getParameterNames().contains("save")) {
handleSave();
}
// If addClipArt button is clicked on whiteboard, message will be sent and this if clause handles that
else if (webRequest.getQueryParameters().getParameterNames().contains("clipArt")) {
handleClipArts();
}
// If addDocument button is clicked on whiteboard, message will be sent and this if clause handles that
else if (webRequest.getQueryParameters().getParameterNames().contains("docList")) {
handleDocs();
;
}
// If document page navigation buttons are clicked on whiteboard, message will be sent and this if clause
// handles that
else if (webRequest.getQueryParameters().getParameterNames().contains("docComponents")) {
String docBaseName = webRequest.getQueryParameters().getParameterValue("docBaseName").toString();
handleDocComponents(docBaseName);
}
// If document is added to whiteboard, message will be sent and this if clause handles that
else if (webRequest.getQueryParameters().getParameterNames().contains("background")) {
String backgroundString = webRequest.getQueryParameters().getParameterValue("background").toString();
handleBackground(backgroundString);
}
}
/**
* Mapping JSON String to Objects and Adding to the Element List
*
* @param editedElement
* @return
*/
private boolean handleEditedElement(String editedElement) {
try {
JSONObject jsonEditedElement = new JSONObject(editedElement);
Element element = getElementObject(jsonEditedElement);
boolean isLoaded = false;
if (!elementMap.isEmpty() && loadedElementMap.get(element.getId()) != null && !loadedElementMap.isEmpty()) {
isLoaded = isEqual(element.getJSON(), loadedElementMap.get(element.getId()).getJSON());
}
// If the edited element is not from file loaded content this clause executes
if (!isLoaded) {
// Adding the element creation/editing is add to the undo snapshots
if (snapShot == null && snapShotCreation == null) {
snapShot = new ArrayList();
snapShotCreation = new ArrayList();
}
if (elementMap.containsKey(element.getId()) && !elementMap.isEmpty()) {
snapShot.add(elementMap.get(element.getId()));
snapShotCreation.add(false);
} else {
snapShot.add(element);
snapShotCreation.add(true);
}
if (Type.PointFree != element.getType()) {
if (undoSnapshots.size() == 20) {
undoSnapshots.pollFirst();
undoSnapshotCreationList.pollFirst();
}
if (Type.PencilCurve == element.getType()) {
List lastElementSnapshot = undoSnapshots.peekLast();
if (lastElementSnapshot != null) {
Element lastSnapshotElement = lastElementSnapshot.get(lastElementSnapshot.size() - 1);
if ((lastSnapshotElement instanceof PencilCurve) && (lastSnapshotElement.getId() == element.getId())) {
List lastCreationSnapshot = undoSnapshotCreationList.getLast();
for (int i = 0; i < snapShot.size(); i++) {
lastElementSnapshot.add(snapShot.get(i));
lastCreationSnapshot.add(snapShotCreation.get(i));
}
} else {
undoSnapshots.addLast(snapShot);
undoSnapshotCreationList.addLast(snapShotCreation);
isElementSnapshotList.addLast(true);
}
}
} else if (Type.ClipArt == element.getType()) {
List snapShotTemp = undoSnapshots.pollLast();
List snapShotCreationTemp = undoSnapshotCreationList.pollLast();
for (int i = 0; i < snapShotTemp.size(); i++) {
snapShot.add(snapShotTemp.get(i));
snapShotCreation.add(snapShotCreationTemp.get(i));
}
undoSnapshots.addLast(snapShot);
undoSnapshotCreationList.addLast(snapShotCreation);
isElementSnapshotList.addLast(true);
} else {
undoSnapshots.addLast(snapShot);
undoSnapshotCreationList.addLast(snapShotCreation);
isElementSnapshotList.addLast(true);
}
snapShot = null;
snapShotCreation = null;
}
// Synchronizing newly added/edited element between whiteboard clients
if (element != null) {
elementMap.put(element.getId(), element);
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
JSONObject jsonObject = new JSONObject(editedElement);
c.sendMessage(getAddElementMessage(jsonObject).toString());
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
}
}
return true;
} catch (JSONException e) {
log.error("Unexpected error while editing element", e);
}
return false;
}
/**
* Synchronizing newly added/edited background between whiteboard clients
*
* @param backgroundString
* @return
*/
private boolean handleBackground(String backgroundString) {
try {
JSONObject backgroundJSON = new JSONObject(backgroundString);
Background backgroundObject = new Background(backgroundJSON);
background = backgroundObject;
Background previousBackground = new Background("Background", "", 0.0, 0.0, 0.0, 0.0);
if (whiteboardMap.get(whiteboardObjectId).getBackground() != null) {
previousBackground = whiteboardMap.get(whiteboardObjectId).getBackground();
}
whiteboardMap.get(whiteboardObjectId).setBackground(background);
undoSnapshotCreationList_Background.addLast(previousBackground == null);
undoSnapshots_Background.addLast(previousBackground);
isElementSnapshotList.addLast(false);
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
JSONObject jsonObject = new JSONObject(backgroundString);
c.sendMessage(getAddBackgroundMessage(jsonObject).toString());
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
return true;
} catch (JSONException e) {
e.printStackTrace();
}
return false;
}
/**
* Undo one step and synchronizing undo between whiteboard clients
*
* @return
*/
private boolean handleUndo() {
if (!isElementSnapshotList.isEmpty()) {
if (isElementSnapshotList.pollLast()) {
List undoCreationList = undoSnapshotCreationList.pollLast();
List undoElement = undoSnapshots.pollLast();
String deleteList = "";
JSONArray changeList = new JSONArray();
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (int i = 0; i < undoElement.size(); i++) {
if (undoCreationList.get(i)) {
elementMap.remove(undoElement.get(i).getId());
if (loadedElementMap.containsKey(undoElement.get(i).getId())) {
loadedContent = "";
whiteboardMap.get(whiteboardObjectId).setLoadedContent("");
loadedElementMap.remove(undoElement.get(i).getId());
}
if ("".equals(deleteList)) {
deleteList = "" + undoElement.get(i).getId();
} else {
deleteList += "," + undoElement.get(i).getId();
}
} else {
elementMap.put(undoElement.get(i).getId(), undoElement.get(i));
try {
changeList.put(undoElement.get(i).getJSON());
} catch (JSONException e) {
log.error("Unexpected error while getting JSON", e);
}
}
}
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
c.sendMessage(getUndoMessage(changeList, deleteList).toString());
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
} else {
Background previousBackground = undoSnapshots_Background.pollLast();
background = previousBackground;
whiteboardMap.get(whiteboardObjectId).setBackground(previousBackground);
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
if (previousBackground != null) {
c.sendMessage(getAddBackgroundMessage(previousBackground.getJSON()).toString());
} else {
c.sendMessage(getAddBackgroundMessage(new JSONObject()).toString());
}
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
}
return true;
}
return false;
}
/**
* Synchronizing eraseAll request between whiteboard clients
*
* @return
*/
private boolean handleEraseAll() {
elementMap.clear();
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
JSONArray jsonArray = new JSONArray();
c.sendMessage(getEraseAllMessage(jsonArray).toString());
return true;
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
return false;
}
/**
* Save the whiteboard content to a file
*
* @return
*/
private boolean handleSave() {
ServletContext servletContext = WebApplication.get().getServletContext();
String saveFolderPath = servletContext.getRealPath("") + "/Saved_Whiteboards";
File saveFolder = new File(saveFolderPath);
if (!saveFolder.exists()) {
saveFolder.mkdir();
}
boolean result = false;
JSONObject saveObject = new JSONObject();
JSONArray elementArray = new JSONArray();
for (int elementID : elementMap.keySet()) {
try {
elementArray.put(elementMap.get(elementID).getJSON());
} catch (JSONException e) {
log.error("Unexpected error while getting JSON", e);
}
}
JSONObject backgroundJSON = null;
if (background != null) {
try {
backgroundJSON = background.getJSON();
} catch (JSONException e) {
log.error("Unexpected error while getting JSON", e);
}
}
try {
saveObject.put("elements", elementArray);
if (backgroundJSON != null) {
saveObject.put("background", backgroundJSON);
}
} catch (JSONException e) {
log.error("Unexpected error while getting JSON", e);
}
File whiteboardFile = new File(saveFolderPath + "/Whiteboard_" + dateFormat.format(new Date()) + ".json");
FileWriter writer = null;
try {
whiteboardFile.createNewFile();
log.debug("Going to dump WB to file: " + whiteboardFile.getAbsolutePath());
writer = new FileWriter(whiteboardFile);
writer.write(saveObject.toString());
writer.flush();
result = true;
} catch (IOException e) {
log.debug("Unexpected error during dumping WB to file ", e);
} finally {
if (writer != null) {
try {
writer.close();
log.debug("Dumped WB to file: " + whiteboardFile.getAbsolutePath());
} catch (IOException e) {
log.debug("Unexpected error during closing WB file ", e);
result = false;
}
}
}
return result;
}
/**
* Load the clipArts list from the clipArt folder and synchronizing the list between whiteboard clients
*/
private void handleClipArts() {
loadClipArts();
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
JSONArray jsonArray = new JSONArray();
for (String clipArtURL : clipArts) {
jsonArray.put(clipArtURL);
}
c.sendMessage(getClipArtListMessage(jsonArray).toString());
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
}
/**
* Load the documents list from the documents folder and synchronizing the list between whiteboard clients
*/
private void handleDocs() {
loadDocuments();
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
JSONArray jsonArray = new JSONArray();
Set keySet = docMap.keySet();
for (String key : keySet) {
jsonArray.put(docMap.get(key).get(0));
}
c.sendMessage(getDocumentListMessage(jsonArray).toString());
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
}
/**
* Load the components of a particular document from the documents folder and synchronizing the list between
* whiteboard clients
*
* @param docBaseName
*/
private void handleDocComponents(String docBaseName) {
loadDocuments();
IWebSocketConnectionRegistry reg = WebSocketSettings.Holder.get(Application.get()).getConnectionRegistry();
for (IWebSocketConnection c : reg.getConnections(Application.get())) {
try {
JSONArray jsonArray = new JSONArray();
for (String url : docMap.get(docBaseName)) {
jsonArray.put(url);
}
c.sendMessage(getDocumentComponentListMessage(jsonArray).toString());
} catch (Exception e) {
log.error("Unexpected error while sending message through the web socket", e);
}
}
}
private JSONObject getAddElementMessage(JSONObject element) throws JSONException {
return new JSONObject().put("type", "addElement").put("json", element);
}
private JSONObject getAddBackgroundMessage(JSONObject element) throws JSONException {
return new JSONObject().put("type", "addBackground").put("json", element);
}
private JSONObject getUndoMessage(JSONArray changeList, String deleteList) throws JSONException {
return new JSONObject().put("type", "undoList").put("changeList", changeList).put("deleteList", deleteList);
}
/* commented for now
private JSONObject getWhiteboardMessage(JSONArray array) throws JSONException {
return new JSONObject().put("type", "parseWB").put("json", array);
}
*/
private JSONObject getEraseAllMessage(JSONArray array) throws JSONException {
return new JSONObject().put("type", "eraseElements").put("json", array);
}
private JSONObject getClipArtListMessage(JSONArray array) throws JSONException {
return new JSONObject().put("type", "clipArtList").put("json", array);
}
private JSONObject getDocumentListMessage(JSONArray array) throws JSONException {
return new JSONObject().put("type", "documentList").put("json", array);
}
private JSONObject getDocumentComponentListMessage(JSONArray array) throws JSONException {
return new JSONObject().put("type", "documentComponentList").put("json", array);
}
public void renderHead(Component component, IHeaderResponse response) {
super.renderHead(component, response);
initReferences(response);
try {
// Synchronizing existing content between clients
JSONArray elements = null;
if (!elementMap.isEmpty()) {
Map sortedElementList = new TreeMap(elementMap);
elements = new JSONArray();
for (Element e : sortedElementList.values()) {
elements.put(e.getJSON());
}
}
response.render(OnDomReadyHeaderItem.forScript(String.format("initWB('%s', '%s', %s, %s);", getCallbackUrl(), whiteboardMarkupId
, elements, background == null ? null : background.getJSON())));
} catch (JSONException e) {
log.error("Unexpected error while getting JSON", e);
}
}
/**
* Loading default resources which need to whiteboard
*
* @param response
*/
private void initReferences(IHeaderResponse response) {
WhiteboardLibrarySettings settings = getLibrarySettings();
// Whiteboard.css
if (settings != null && settings.getWhiteboardStyleSheetReference() != null) {
response.render(new PriorityHeaderItem(CssHeaderItem.forReference(settings.getWhiteboardStyleSheetReference())));
} else {
response.render(new PriorityHeaderItem(CssHeaderItem.forReference(WhiteboardStyleSheetResourceReference.get())));
}
// Goog.css
if (settings != null && settings.getGoogStyleSheetReference() != null) {
response.render(new PriorityHeaderItem(CssHeaderItem.forReference(settings.getGoogStyleSheetReference())));
} else {
response.render(new PriorityHeaderItem(CssHeaderItem.forReference(GoogStyleSheetResourceReference.get())));
}
// translate.js
if (settings != null && settings.getTranslateJavaScriptReference() != null) {
response.render(new PriorityHeaderItem(JavaScriptHeaderItem.forReference(settings.getTranslateJavaScriptReference())));
} else {
response.render(new PriorityHeaderItem(JavaScriptHeaderItem.forReference(TranslateJavaScriptResourceReference.get())));
}
// whiteboard.js
if (settings != null && settings.getWhiteboardJavaScriptReference() != null) {
response.render(new PriorityHeaderItem(JavaScriptHeaderItem.forReference(settings.getWhiteboardJavaScriptReference())));
} else {
response.render(new PriorityHeaderItem(JavaScriptHeaderItem.forReference(WhiteboardJavaScriptResourceReference.get())));
}
// wb-helper.js
if (settings != null && settings.getWhiteboardHelperJavaScriptReference() != null) {
response.render(new PriorityHeaderItem(JavaScriptHeaderItem.forReference(settings.getWhiteboardHelperJavaScriptReference())));
} else {
response.render(new PriorityHeaderItem(JavaScriptHeaderItem.forReference(WhiteboardHelperJavaScriptResourceReference.get())));
}
}
private static WhiteboardLibrarySettings getLibrarySettings() {
if (Application.exists() && (Application.get().getJavaScriptLibrarySettings() instanceof WhiteboardLibrarySettings)) {
return (WhiteboardLibrarySettings) Application.get().getJavaScriptLibrarySettings();
}
return null;
}
public Map getElementMap() {
return elementMap;
}
/**
* Give a Element object for given JSON object which represent a element
*
* @param obj
* @return
* @throws JSONException
*/
private Element getElementObject(JSONObject obj) throws JSONException {
Element element = null;
Type type = Type.valueOf(obj.getString("type"));
switch (type) {
case CircleGeneral:
element = new CircleGeneral(obj);
break;
case Circle_3p:
element = new Circle_3p(obj);
break;
case LineGeneral:
element = new LineGeneral(obj);
break;
case Line_2p:
element = new Line_2p(obj);
break;
case PencilArrow:
element = new PencilArrow(obj);
break;
case PencilCircle:
element = new PencilCircle(obj);
break;
case PencilCurve:
element = new PencilCurve(obj);
break;
case PencilFreeLine:
element = new PencilFreeLine(obj);
break;
case PencilPointAtRect:
element = new PencilPointAtRect(obj);
break;
case PencilPointer:
element = new PencilPointer(obj);
break;
case PencilRect:
element = new PencilRect(obj);
break;
case PencilUnderline:
element = new PencilUnderline(obj);
break;
case PointAtCircle:
element = new PointAtCircle(obj);
break;
case PointAtLine:
element = new PointAtLine(obj);
break;
case PointFree:
element = new PointFree(obj);
break;
case Point_2c:
element = new Point_2c(obj);
break;
case Point_2l:
element = new Point_2l(obj);
break;
case Point_lc:
element = new Point_lc(obj);
break;
case Segment:
element = new Segment(obj);
break;
case Text:
element = new Text(obj);
break;
case ClipArt:
element = new ClipArt(obj);
break;
default:
break;
}
return element;
}
/**
* Load clipArts from the clipArt folder and filling the clipArts list
*/
private void loadClipArts() {
List pictureExtensions = Arrays.asList(new String[] { "jpg", "bmp", "png", "jpeg", "gif" });
ServletContext servletContext = WebApplication.get().getServletContext();
HttpServletRequest httpReq = (HttpServletRequest) ((WebRequest) RequestCycle.get().getRequest())
.getContainerRequest();
Url relative = Url.parse(httpReq.getContextPath());
String basURL = RequestCycle.get().getUrlRenderer().renderFullUrl(relative);
String clipArtFolderPath = servletContext.getRealPath("") + "/" + clipArtFolder;
File folder = new File(clipArtFolderPath);
for (final File fileEntry : folder.listFiles()) {
if (!fileEntry.isDirectory()) {
String extension = "";
int i = fileEntry.getAbsolutePath().lastIndexOf('.');
if (i > 0) {
extension = fileEntry.getAbsolutePath().substring(i + 1);
}
if (pictureExtensions.contains(extension)) {
String clipArtURL = basURL + "/" + clipArtFolder + "/" + fileEntry.getName();
if (!clipArts.contains(clipArtURL)) {
clipArts.add(clipArtURL);
}
}
}
}
}
/**
* Load documents from the documents folder and filling the documents list
*/
private void loadDocuments() {
String pictureExtension = "jpg";
ServletContext servletContext = WebApplication.get().getServletContext();
HttpServletRequest httpReq = (HttpServletRequest) ((WebRequest) RequestCycle.get().getRequest()).getContainerRequest();
Url relative = Url.parse(httpReq.getContextPath());
String basURL = RequestCycle.get().getUrlRenderer().renderFullUrl(relative);
String clipArtFolderPath = servletContext.getRealPath("") + "/" + documentFolder;
File folder = new File(clipArtFolderPath);
for (final File fileEntry : folder.listFiles()) {
if (!fileEntry.isDirectory()) {
String extension = "";
int i = fileEntry.getAbsolutePath().lastIndexOf('.');
if (i > 0) {
extension = fileEntry.getAbsolutePath().substring(i + 1);
}
if (pictureExtension.equals(extension)) {
String docURL = basURL + "/" + documentFolder + "/" + fileEntry.getName();
String documentName = fileEntry.getName().substring(0, fileEntry.getName().lastIndexOf('.'));
if (-1 == documentName.lastIndexOf('_')) {
ArrayList docList = new ArrayList();
docList.add(docURL);
docMap.put(documentName, docList);
} else {
String documentBaseName = documentName.substring(0, documentName.lastIndexOf('_'));
if (docMap.containsKey(documentBaseName)) {
docMap.get(documentBaseName).add(docURL);
}
}
}
}
}
}
/**
* Check the equality of two elements on a whiteboard
*
* @param element1
* @param element2
* @return
*/
private boolean isEqual(JSONObject element1, JSONObject element2) {
for (String key : element1.keySet()) {
Object value = null;
try {
value = element2.get(key);
if (value == null) {
return false;
} else {
if (value instanceof String) {
if (!value.equals(element1.get(key))) {
return false;
}
} else if (value instanceof Integer) {
Integer x = (Integer) value;
Integer y = (Integer) element1.get(key);
if (x.intValue() != y.intValue()) {
return false;
}
} else if (value instanceof Double) {
Double x = (Double) value;
Double y = (Double) element1.get(key);
if (x.doubleValue() != y.doubleValue()) {
return false;
}
}
}
} catch (JSONException e) {
e.printStackTrace();
return false;
}
}
return true;
}
}
