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.RequestBuilder;
  41 import com.google.gwt.http.client.Response;
  42
  43 /**
  44  * @author kman
  45  */
  46 public abstract class GetCommand<T extends RestResource> extends RestCommand{
  47
  48         boolean complete = false;
  49         T result = null;
  50         Class<T> aclass;
  51         private final String path;
  52         private String username;
  53         private boolean requestSent = false;
  54         T cached;
  55
  56         public GetCommand(Class<T> theclass, String pathToGet, T theCached){
  57                 this(theclass, pathToGet, true, theCached);
  58         }
  59
  60         public GetCommand(Class<T> theclass, String pathToGet, boolean showLoading, T theCached){
  61                 setShowLoadingIndicator(showLoading);
  62                 if(isShowLoadingIndicator())
  63                         GSS.get().showLoadingIndicator();
  64                 this.aclass = theclass;
  65                 if(pathToGet.indexOf("?") != -1)
  66                         path = pathToGet;
  67                 else
  68                         path =fixPath(pathToGet);
  69                 this.cached = theCached;
  70         }
  71
  72         public GetCommand(Class<T> theclass, String aUsername , String pathToGet, T theCached){
  73                 this(theclass, aUsername, pathToGet, true, theCached);
  74         }
  75
  76         public GetCommand(Class<T> theclass, String aUsername , String pathToGet, boolean showLoading, T theCached){
  77                 setShowLoadingIndicator(showLoading);
  78                 if(isShowLoadingIndicator())
  79                         GSS.get().showLoadingIndicator();
  80                 this.aclass = theclass;
  81                 path = fixPath(pathToGet);
  82                 this.username = aUsername;
  83                 this.cached = theCached;
  84         }
  85
  86         private void sendRequest(){
  87                 if(requestSent)
  88                         return;
  89                 requestSent=true;
  90                 RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, path);
  91                 if(cached!=null && cached.getLastModifiedSince() != null)
  92                         builder.setHeader("If-Modified-Since", cached.getLastModifiedSince());
  93                 try {
  94                         if(username == null)
  95                                 handleHeaders(builder, path);
  96                         else
  97                                 handleHeaders(username, builder, path);
  98                         builder.sendRequest("", new RestCallback(path) {
  99
 100                                 @Override
 101                                 public Object deserialize(Response response) {
 102                                         return deserializeResponse(path, response);
 103                                 }
 104
 105                                 @Override
 106                                 public void handleError(Request request, Throwable exception) {
 107                                         if(exception instanceof RestException)
 108                                                 if(((RestException)exception).getHttpStatusCode() == 304 && cached != null){
 109                                                         GWT.log("Using cache:"+cached.getUri(), null);
 110                                                         handleSuccess(cached);
 111                                                         return;
 112                                                 }
 113                                         complete = true;
 114                                         GetCommand.this.onError(exception);
 115                                 }
 116
 117                                 @Override
 118                                 public void handleSuccess(Object object) {
 119                                         result = (T) object;
 120                                         complete = true;
 121                                 }
 122
 123                         });
 124                 } catch (Exception ex) {
 125                         complete = true;
 126                         onError(ex);
 127                 }
 128         }
 129         public boolean isComplete() {
 130                 return complete;
 131         }
 132
 133         public T getResult(){
 134                 return result;
 135         }
 136
 137         @Override
 138         public boolean execute() {
 139                 if(!requestSent)
 140                         sendRequest();
 141                 boolean com = isComplete();
 142                 if(com){
 143                         if(isShowLoadingIndicator())
 144                                 GSS.get().hideLoadingIndicator();
 145                         if(getResult() != null)
 146                                 onComplete();
 147                         return false;
 148                 }
 149                 return true;
 150         }
 151
 152         public Object deserializeResponse(String aPath, Response response) {
 153                 RestResource result1 = null;
 154                 if(aclass.equals(FolderResource.class)){
 155                         result1 = new FolderResource(aPath);
 156                         result1.createFromJSON(response.getText());
 157                 }
 158                 else if(aclass.equals(FileResource.class)){
 159                         result1 = new FileResource(aPath);
 160                         result1.createFromJSON(response.getHeader("X-GSS-Metadata"));
 161                 }
 162                 else if(aclass.equals(GroupsResource.class)){
 163                         result1 = new GroupsResource(aPath);
 164                         result1.createFromJSON(response.getText());
 165                 }
 166                 else if(aclass.equals(TrashResource.class)){
 167                         result1 = new TrashResource(aPath);
 168                         result1.createFromJSON(response.getText());
 169                 }
 170                 else if(aclass.equals(SharedResource.class)){
 171                         result1 = new SharedResource(aPath);
 172                         result1.createFromJSON(response.getText());
 173                 }
 174                 else if(aclass.equals(OthersResource.class)){
 175                         result1 = new OthersResource(aPath);
 176                         result1.createFromJSON(response.getText());
 177                 }
 178                 else if(aclass.equals(OtherUserResource.class)){
 179                         result1 = new OtherUserResource(aPath);
 180                         result1.createFromJSON(response.getText());
 181                 }
 182                 else if(aclass.equals(GroupResource.class)){
 183                         result1 = new GroupResource(aPath);
 184                         result1.createFromJSON(response.getText());
 185                 }
 186                 else if(aclass.equals(GroupUserResource.class)){
 187                         result1 = new GroupUserResource(aPath);
 188                         result1.createFromJSON(response.getText());
 189                 }
 190                 else if(aclass.equals(UserResource.class)){
 191                         result1 = new UserResource(aPath);
 192                         result1.createFromJSON(response.getText());
 193                 }
 194                 else if(aclass.equals(TagsResource.class)){
 195                         result1 = new TagsResource(aPath);
 196                         result1.createFromJSON(response.getText());
 197                 }
 198                 else if(aclass.equals(SearchResource.class)){
 199                         result1 = new SearchResource(aPath);
 200                         result1.createFromJSON(response.getText());
 201                 }
 202                 else if(aclass.equals(UserSearchResource.class)){
 203                         result1 = new UserSearchResource(aPath);
 204                         result1.createFromJSON(response.getText());
 205                 }
 206                 else if(aclass.equals(UploadStatusResource.class)){
 207                         result1 = new UploadStatusResource(aPath);
 208                         result1.createFromJSON(response.getText());
 209                 }
 210                 return result1;
 211         }
 212
 213         public T getCached() {
 214                 return cached;
 215         }
 216
 217         public void setCached(T theCached) {
 218                 this.cached = theCached;
 219         }
 220 }