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Added Use Cases functionalities
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@NuriaGarcia
NuriaGarcia committed Feb 24, 2015
1 parent 6b0b6db commit 21d1243
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Showing 5 changed files with 428 additions and 107 deletions.
214 changes: 146 additions & 68 deletions src/com/expertsystem/lab/lov/LOVConnector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,11 @@
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import org.json.JSONArray;
import org.json.JSONObject;

/**
Expand All @@ -25,17 +28,27 @@

public class LOVConnector implements Constants {

public int total_results;

public LOVConnector(){
this.total_results = 0;
}

public int getTotal_results() {
return total_results;
}

public void setTotal_results(int total_results) {
this.total_results = total_results;
}

/**
* Method to search a term through LOV API
* @param q: Query string
* @param type: Type of the term [class, property, datatype, instance]
* @return JSONObject: Results from the query in json format
*/

/*
* Maybe instead returning a JSON object, we could make a POJO class with general
* data that we need and filling the information parsing the JSON string
*/

public JSONObject searchTerm(String q, String type){
HttpURLConnection connection;
JSONObject json = null;
Expand All @@ -59,9 +72,10 @@ public JSONObject searchTerm(String q, String type){
response.append(str);
}
rd.close();

System.out.println(response.toString());


json = new JSONObject(response.toString());
//System.out.println(response.toString());

} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
Expand All @@ -71,7 +85,68 @@ public JSONObject searchTerm(String q, String type){
}
return json;
}


public List<ResultsListItem> parseTerms(JSONObject json){
List<ResultsListItem> results = new ArrayList<ResultsListItem>();

this.total_results = json.getInt("total_results");
//System.out.println(total_results);

if(total_results > 0){
JSONArray terms = (JSONArray) json.get("results");
for (int i=0; i < terms.length(); i++) {
JSONObject data = (JSONObject) terms.get(i);

//Local Name
String prefixName = data.getJSONArray("prefixedName").get(0).toString();
String local_name = prefixName.substring(prefixName.lastIndexOf(':') + 1);
//System.out.println(local_name);

//Prefix
String prefix = data.getJSONArray("vocabulary.prefix").get(0).toString();
//System.out.println(prefix);

//Occurrences
String ocurrences = data.getJSONArray("metrics.occurrencesInDatasets").get(0).toString();
//System.out.println(ocurrences);

//Datasets
String datasets = data.getJSONArray("metrics.reusedByDatasets").get(0).toString();
//System.out.println(datasets);

//Uri
String uri = data.getJSONArray("uri").get(0).toString();
//System.out.println(uri);

//Confidence
double score = data.getDouble("score");
//System.out.println(score);

JSONObject highlight = data.getJSONObject("highlight");
//Comment
String comment = "";
if(!highlight.isNull("http://www.w3.org/2000/01/rdf-schema#comment")){
comment = highlight.getJSONArray("http://www.w3.org/2000/01/rdf-schema#comment").get(0).toString();
//comment = comment.replaceAll("\"", " ");
//comment = comment.replace('"', '\"');
//System.out.println(comment);

}

//Label
String label = "";
if(!highlight.isNull("http://www.w3.org/2000/01/rdf-schema#label")){
label = highlight.getJSONArray("http://www.w3.org/2000/01/rdf-schema#label").get(0).toString();
//System.out.println(label);
}

ResultsListItem item = new ResultsListItem(local_name, prefix, uri, ocurrences, datasets, comment, label, score);
results.add(item);
}
}
return results;
}

/*
* ex:http://lov.okfn.org/dataset/lov/api/v2/term/autocomplete?q=foaf:p&type=property
* string = URI or prefixed URI to complete (from 1 character).
Expand Down Expand Up @@ -100,67 +175,66 @@ public JSONObject autocompleteTerm(String q, String type){
response.append(str);
}
rd.close();

System.out.println(response.toString());

} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}


return json;
}







/* listing all the vocabularies
* in LOV ecosystem. Results composed of {titles[{lang,value}], nsp, prefix, uri}
*
*/
public JSONObject listVocab() throws Exception
{
{
JSONObject obj = null;

// build the string and URL
String s = LOV_API_VOCAB + "list";
//s += URLEncoder.encode("UTF-8");
s += URLEncoder.encode(s, "UTF-8");
URL url = new URL(s);
// read from the URL
Scanner scan = new Scanner(url.openStream());
String str = new String();
while (scan.hasNext())
str += scan.nextLine();
scan.close();
// build a JSON object
obj = new JSONObject(str);
if (! obj.getString("status").equals("OK"))
return null;
//s += URLEncoder.encode("UTF-8");
s += URLEncoder.encode(s, "UTF-8");
URL url = new URL(s);

// read from the URL
Scanner scan = new Scanner(url.openStream());
String str = new String();
while (scan.hasNext())
str += scan.nextLine();
scan.close();

// build a JSON object
obj = new JSONObject(str);
if (! obj.getString("status").equals("OK"))
return null;
/* todo: parse the result prefix, title + uri + description
JSONArray arr = obj.getJSONArray("titles");
for (int i = 0; i < arr.length(); i++)
// print the result
System.out.println(arr.getJSONObject(i));
*/
return obj;
*/

return obj;
}



/*get http://lov.okfn.org/dataset/lov/api/v2/vocabulary/info?vocab={string}
*example: http://lov.okfn.org/dataset/lov/api/v2/vocabulary/info?vocab=skos
* input: string representing Prefix, URI or Namespace of a vocabulary in LOV.
* This parameter is mandatory
*output: uri, titles, descriptions, tags (domaine)
*/
*example: http://lov.okfn.org/dataset/lov/api/v2/vocabulary/info?vocab=skos
* input: string representing Prefix, URI or Namespace of a vocabulary in LOV.
* This parameter is mandatory
*output: uri, titles, descriptions, tags (domaine)
*/
public JSONObject infoVocab(String vocab) throws Exception{
JSONObject result = null;
// build the string and URL
Expand All @@ -169,33 +243,37 @@ public JSONObject infoVocab(String vocab) throws Exception{
//st += URLEncoder.encode("UTF-8");
st += URLEncoder.encode(st, "UTF-8");
URL url = new URL(st);

// read from the URL
Scanner scan = new Scanner(url.openStream());
String str = new String();
while (scan.hasNext())
str += scan.nextLine();
scan.close();
// build a JSON object
result = new JSONObject(str);
if (! result.getString("status").equals("OK"))
return null;
Scanner scan = new Scanner(url.openStream());
String str = new String();
while (scan.hasNext())
str += scan.nextLine();
scan.close();

// build a JSON object
result = new JSONObject(str);
if (! result.getString("status").equals("OK"))
return null;


return result;



}

/*
* Any other necessary method to get data from the LOV API ? Maybe for agent
*/


/*public static void main(String[] args){
LOVApi lovapi = new LOVApi();
lovapi.searchTerm("Person", "class");
} */


public static void main(String[] args){
//LOVConnector lovapi = new LOVConnector();
//lovapi.searchTerm("Scale", "class");
//lovapi.parseTerms(lovapi.searchTerm("Scale", "class"));

/*String uri = "http://www.aktors.org/ontology/portal#Person";
String name = "Person";
String base_uri = uri.substring(0, uri.length() - name.length());
System.out.println(base_uri);*/
}
}
4 changes: 2 additions & 2 deletions src/com/expertsystem/lab/lov/ResultsListItem.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,8 @@ public ResultsListItem(String name){
this.name = name;
this.prefix = "";
this.url_vocab = "";
this.num_ocurrences = "";
this.num_datasets = "";
this.num_ocurrences = "0";
this.num_datasets = "0";
this.comment = "";
this.label = "";
this.confidence = 0.0;
Expand Down
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