code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/client/rest/GetCommand.java

   1 /*
   2  * Copyright 2009 Electronic Business Systems Ltd.
   3  *
   4  * This file is part of GSS.
   5  *
   6  * GSS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GSS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 package gr.ebs.gss.client.rest;
  20
  21 import gr.ebs.gss.client.GSS;
  22 import gr.ebs.gss.client.rest.resource.FileResource;
  23 import gr.ebs.gss.client.rest.resource.FolderResource;
  24 import gr.ebs.gss.client.rest.resource.GroupResource;
  25 import gr.ebs.gss.client.rest.resource.GroupUserResource;
  26 import gr.ebs.gss.client.rest.resource.GroupsResource;
  27 import gr.ebs.gss.client.rest.resource.OtherUserResource;
  28 import gr.ebs.gss.client.rest.resource.OthersResource;
  29 import gr.ebs.gss.client.rest.resource.RestResource;
  30 import gr.ebs.gss.client.rest.resource.SearchResource;
  31 import gr.ebs.gss.client.rest.resource.SharedResource;
  32 import gr.ebs.gss.client.rest.resource.TagsResource;
  33 import gr.ebs.gss.client.rest.resource.TrashResource;
  34 import gr.ebs.gss.client.rest.resource.UploadStatusResource;
  35 import gr.ebs.gss.client.rest.resource.UserResource;
  36 import gr.ebs.gss.client.rest.resource.UserSearchResource;
  37
  38 import com.google.gwt.core.client.GWT;
  39 import com.google.gwt.http.client.Request;
  40 import com.google.gwt.http.client.Response;
  41
  42 /**
  43  * @author kman
  44  */
  45 public abstract class GetCommand<T extends RestResource> extends RestCommand{
  46
  47         boolean complete = false;
  48         T result = null;
  49         Class<T> aclass;
  50         private final String path;
  51         private String username;
  52         private boolean requestSent = false;
  53         T cached;
  54
  55         public GetCommand(Class<T> theclass, String pathToGet, T theCached){
  56                 this(theclass, pathToGet, true, theCached);
  57         }
  58
  59         public GetCommand(Class<T> theclass, String pathToGet, boolean showLoading, T theCached){
  60                 setShowLoadingIndicator(showLoading);
  61                 if(isShowLoadingIndicator())
  62                         GSS.get().showLoadingIndicator();
  63                 this.aclass = theclass;
  64                 if(pathToGet.indexOf("?") != -1)
  65                         path = pathToGet;
  66                 else
  67                         path =fixPath(pathToGet);
  68                 this.cached = theCached;
  69         }
  70
  71         public GetCommand(Class<T> theclass, String aUsername , String pathToGet, T theCached){
  72                 this(theclass, aUsername, pathToGet, true, theCached);
  73         }
  74
  75         public GetCommand(Class<T> theclass, String aUsername , String pathToGet, boolean showLoading, T theCached){
  76                 setShowLoadingIndicator(showLoading);
  77                 if(isShowLoadingIndicator())
  78                         GSS.get().showLoadingIndicator();
  79                 this.aclass = theclass;
  80                 path = fixPath(pathToGet);
  81                 this.username = aUsername;
  82                 this.cached = theCached;
  83         }
  84
  85         private void sendRequest(){
  86                 if(requestSent)
  87                         return;
  88                 requestSent=true;
  89                 RestRequestBuilder builder = new RestRequestBuilder("GET", path);
  90                 if(cached!=null && cached.getLastModifiedSince() != null)
  91                         builder.setHeader("If-Modified-Since", cached.getLastModifiedSince());
  92                 try {
  93                         if(username == null)
  94                                 handleHeaders(builder, path);
  95                         else
  96                                 handleHeaders(username, builder, path);
  97                         builder.sendRequest("", new RestCallback(path) {
  98
  99                                 @Override
 100                                 public Object deserialize(Response response) {
 101                                         return deserializeResponse(path, response);
 102                                 }
 103
 104                                 @Override
 105                                 public void handleError(Request request, Throwable exception) {
 106                                         if(exception instanceof RestException)
 107                                                 if(((RestException)exception).getHttpStatusCode() == 304 && cached != null){
 108                                                         GWT.log("Using cache:"+cached.getUri(), null);
 109                                                         handleSuccess(cached);
 110                                                         return;
 111                                                 }
 112                                         complete = true;
 113                                         GetCommand.this.onError(exception);
 114                                 }
 115
 116                                 @Override
 117                                 public void handleSuccess(Object object) {
 118                                         result = (T) object;
 119                                         complete = true;
 120                                 }
 121
 122                         });
 123                 } catch (Exception ex) {
 124                         complete = true;
 125                         onError(ex);
 126                 }
 127         }
 128         public boolean isComplete() {
 129                 return complete;
 130         }
 131
 132         public T getResult(){
 133                 return result;
 134         }
 135
 136         public boolean execute() {
 137                 if(!requestSent)
 138                         sendRequest();
 139                 boolean com = isComplete();
 140                 if(com){
 141                         if(isShowLoadingIndicator())
 142                                 GSS.get().hideLoadingIndicator();
 143                         if(getResult() != null)
 144                                 onComplete();
 145                         return false;
 146                 }
 147                 return true;
 148         }
 149
 150         public Object deserializeResponse(String aPath, Response response) {
 151                 RestResource result1 = null;
 152                 if(aclass.equals(FolderResource.class)){
 153                         result1 = new FolderResource(aPath);
 154                         result1.createFromJSON(response.getText());
 155                 }
 156                 else if(aclass.equals(FileResource.class)){
 157                         result1 = new FileResource(aPath);
 158                         result1.createFromJSON(response.getHeader("X-GSS-Metadata"));
 159                 }
 160                 else if(aclass.equals(GroupsResource.class)){
 161                         result1 = new GroupsResource(aPath);
 162                         result1.createFromJSON(response.getText());
 163                 }
 164                 else if(aclass.equals(TrashResource.class)){
 165                         result1 = new TrashResource(aPath);
 166                         result1.createFromJSON(response.getText());
 167                 }
 168                 else if(aclass.equals(SharedResource.class)){
 169                         result1 = new SharedResource(aPath);
 170                         result1.createFromJSON(response.getText());
 171                 }
 172                 else if(aclass.equals(OthersResource.class)){
 173                         result1 = new OthersResource(aPath);
 174                         result1.createFromJSON(response.getText());
 175                 }
 176                 else if(aclass.equals(OtherUserResource.class)){
 177                         result1 = new OtherUserResource(aPath);
 178                         result1.createFromJSON(response.getText());
 179                 }
 180                 else if(aclass.equals(GroupResource.class)){
 181                         result1 = new GroupResource(aPath);
 182                         result1.createFromJSON(response.getText());
 183                 }
 184                 else if(aclass.equals(GroupUserResource.class)){
 185                         result1 = new GroupUserResource(aPath);
 186                         result1.createFromJSON(response.getText());
 187                 }
 188                 else if(aclass.equals(UserResource.class)){
 189                         result1 = new UserResource(aPath);
 190                         result1.createFromJSON(response.getText());
 191                 }
 192                 else if(aclass.equals(TagsResource.class)){
 193                         result1 = new TagsResource(aPath);
 194                         result1.createFromJSON(response.getText());
 195                 }
 196                 else if(aclass.equals(SearchResource.class)){
 197                         result1 = new SearchResource(aPath);
 198                         result1.createFromJSON(response.getText());
 199                 }
 200                 else if(aclass.equals(UserSearchResource.class)){
 201                         result1 = new UserSearchResource(aPath);
 202                         result1.createFromJSON(response.getText());
 203                 }
 204                 else if(aclass.equals(UploadStatusResource.class)){
 205                         result1 = new UploadStatusResource(aPath);
 206                         result1.createFromJSON(response.getText());
 207                 }
 208                 return result1;
 209         }
 210
 211         public T getCached() {
 212                 return cached;
 213         }
 214
 215         public void setCached(T theCached) {
 216                 this.cached = theCached;
 217         }
 218 }