/*******************************************************************************
* Copyright 2012 University of Southern California
*
* 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.
*
* This code was developed by the Information Integration Group as part
* of the Karma project at the Information Sciences Institute of the
* University of Southern California. For more information, publications,
* and related projects, please see: http://www.isi.edu/integration
******************************************************************************/
package edu.isi.karma.controller.command;
import java.io.PrintWriter;
import org.json.JSONException;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import edu.isi.karma.controller.update.AbstractUpdate;
import edu.isi.karma.controller.update.ErrorUpdate;
import edu.isi.karma.controller.update.UpdateContainer;
import edu.isi.karma.er.helper.TripleStoreUtil;
import edu.isi.karma.rep.Worksheet;
import edu.isi.karma.rep.Workspace;
import edu.isi.karma.view.VWorkspace;
/**
* Class responsible for fetching all the graphs in the tripleStore
*/
public class GetUniqueGraphUrlCommand extends WorksheetCommand {
private String tripleStoreUrl;
private String graphUriTobeValidated;
private enum JsonKeys {
updateType, graphUri, worksheetId
}
private static Logger logger = LoggerFactory.getLogger(GetUniqueGraphUrlCommand.class);
protected GetUniqueGraphUrlCommand(String id, String worksheetId, String url, String context ){
super(id, worksheetId);
this.tripleStoreUrl=url;
this.graphUriTobeValidated = context;
}
@Override
public String getCommandName() {
return this.getClass().getSimpleName();
}
@Override
public String getTitle() {
return "GetUniqueGraphUrl";
}
@Override
public String getDescription() {
return null;
}
@Override
public CommandType getCommandType() {
return CommandType.notInHistory;
}
@Override
public UpdateContainer doIt(Workspace workspace) throws CommandException {
TripleStoreUtil utilObj = new TripleStoreUtil();
// get the source name for this work sheet
Worksheet worksheet = workspace.getWorksheet(this.worksheetId);
// prepare the graph url if graphUri is not provided
if(this.graphUriTobeValidated == null || this.graphUriTobeValidated.isEmpty()) {
String title = worksheet.getTitle();
title = title.replace(".", "_");
this.graphUriTobeValidated = "http://localhost.com/worksheets/"+title;
}
// check for uniqueness with the existing contexts
if(!utilObj.isUniqueGraphUri(this.tripleStoreUrl, this.graphUriTobeValidated)) {
// modify the url if required
if(this.graphUriTobeValidated.charAt(this.graphUriTobeValidated.length()-1) != '/') {
this.graphUriTobeValidated += "/";
}
this.graphUriTobeValidated += String.valueOf(System.nanoTime());
}
final String graphUri = this.graphUriTobeValidated;
logger.info("GraphUri generated : " + graphUri);
try {
return new UpdateContainer(new AbstractUpdate() {
@Override
public void generateJson(String prefix, PrintWriter pw, VWorkspace vWorkspace) {
JSONObject obj = new JSONObject();
try {
obj.put(JsonKeys.updateType.name(), "GetUniqueGraphUrl");
obj.put(JsonKeys.graphUri.name(), graphUri);
pw.println(obj.toString());
} catch (JSONException e) {
logger.error("Error occurred while creating unique graphUri !", e);
}
}
});
} catch (Exception e) {
logger.error("Error occurred while fetching graphs!", e);
return new UpdateContainer(new ErrorUpdate("Error occurred while fetching graphs!"));
}
}
@Override
public UpdateContainer undoIt(Workspace workspace) {
return null;
}
}