code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/client/rest/HeadCommand.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.exceptions.ObjectNotFoundException;
  23 import gr.ebs.gss.client.rest.resource.FileResource;
  24 import gr.ebs.gss.client.rest.resource.FolderResource;
  25 import gr.ebs.gss.client.rest.resource.GroupResource;
  26 import gr.ebs.gss.client.rest.resource.GroupUserResource;
  27 import gr.ebs.gss.client.rest.resource.GroupsResource;
  28 import gr.ebs.gss.client.rest.resource.RestResource;
  29 import gr.ebs.gss.client.rest.resource.SharedResource;
  30 import gr.ebs.gss.client.rest.resource.TrashResource;
  31 import gr.ebs.gss.client.rest.resource.UserResource;
  32
  33 import com.google.gwt.http.client.Request;
  34 import com.google.gwt.http.client.Response;
  35
  36
  37 /**
  38  * @author kman
  39  *
  40  */
  41 public  abstract class HeadCommand <T extends RestResource> extends RestCommand{
  42
  43         boolean complete = false;
  44         T result = null;
  45         Class<T> aclass;
  46
  47         public HeadCommand(Class<T> aclass, String pathToGet){
  48                 this(aclass, pathToGet, true);
  49         }
  50         public HeadCommand(Class<T> aclass, String pathToGet, boolean showLoading){
  51                 setShowLoadingIndicator(showLoading);
  52                 this.aclass = aclass;
  53                 if(isShowLoadingIndicator())
  54                         GSS.get().showLoadingIndicator();
  55                 final String path;
  56                 if(aclass.equals(FileResource.class))
  57                         path = pathToGet;
  58                 else
  59                         path = fixPath(pathToGet);
  60                 RestRequestBuilder builder = new RestRequestBuilder("HEAD", path);
  61
  62                 try {
  63                         handleHeaders(builder, path);
  64                         builder.sendRequest("", new RestCallback(path) {
  65
  66                                 public Object deserialize(Response response) {
  67                                         return deserializeResponse(path, response);
  68                                 }
  69
  70                                 public void handleError(Request request, Throwable exception) {
  71                                         complete = true;
  72                                         HeadCommand.this.onError(exception);
  73                                 }
  74
  75                                 public void handleSuccess(Object object) {
  76                                         result = (T) object;
  77                                         complete = true;
  78                                 }
  79
  80                         });
  81                 } catch (Exception ex) {
  82                         complete = true;
  83                         onError(ex);
  84                 }
  85         }
  86
  87
  88         public boolean isComplete() {
  89                 return complete;
  90         }
  91
  92         public T getResult(){
  93                 return result;
  94         }
  95
  96         public boolean execute() {
  97                 boolean com = isComplete();
  98                 if(com){
  99                         if(isShowLoadingIndicator())
 100                                 GSS.get().hideLoadingIndicator();
 101                         if(getResult() != null)
 102                                 onComplete();
 103                         else
 104                                 onError(new ObjectNotFoundException("Resource Not Found"));
 105                         return false;
 106                 }
 107                 return true;
 108         }
 109
 110         public  Object deserializeResponse(String path, Response response){
 111                 RestResource result1 = null;
 112                 if(aclass.equals(FolderResource.class)){
 113                         result1 = new FolderResource(path);
 114                         result1.createFromJSON(response.getText());
 115
 116                 }
 117                 else if(aclass.equals(FileResource.class)){
 118                         result1 = new FileResource(path);
 119                         result1.createFromJSON(response.getHeader("X-GSS-Metadata"));
 120                 }
 121                 else if(aclass.equals(GroupsResource.class)){
 122                         result1 = new GroupsResource(path);
 123                         result1.createFromJSON(response.getText());
 124                 }
 125                 else if(aclass.equals(TrashResource.class)){
 126                         result1 = new TrashResource(path);
 127                         result1.createFromJSON(response.getText());
 128
 129                 }
 130                 else if(aclass.equals(SharedResource.class)){
 131                         result1 = new SharedResource(path);
 132                         result1.createFromJSON(response.getText());
 133
 134                 }
 135                 else if(aclass.equals(GroupResource.class)){
 136                         result1 = new GroupResource(path);
 137                         result1.createFromJSON(response.getText());
 138
 139                 }
 140                 else if(aclass.equals(GroupUserResource.class)){
 141                         result1 = new GroupUserResource(path);
 142                         result1.createFromJSON(response.getText());
 143
 144                 }
 145                 else if(aclass.equals(UserResource.class)){
 146                         result1 = new UserResource(path);
 147                         result1.createFromJSON(response.getText());
 148
 149                 }
 150                 return result1;
 151
 152         }
 153
 154 }