org.aksw.TripleCheckMate.shared.sparql.JsonSparqlResult.java Source code

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Here is the source code for org.aksw.TripleCheckMate.shared.sparql.JsonSparqlResult.java

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/*******************************************************************************
 * Copyright 2013 Agile Knowledge Engineering and Semantic Web (AKSW) Group
 *
 * 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.
 ******************************************************************************/
package org.aksw.TripleCheckMate.shared.sparql;

import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONValue;

import java.util.ArrayList;
import java.util.List;

public class JsonSparqlResult {

    // TODO create an object for this not string!
    public List<List<ResultItem>> data = new ArrayList<List<ResultItem>>();
    public List<String> head = new ArrayList<String>();

    public JsonSparqlResult(String json) throws Exception {
        try {
            // Parse json and get the Object
            JSONValue value = JSONParser.parseLenient(json);
            JSONObject obj = value.isObject();

            //First we need to take the description
            //{ "head": { "link": [], "vars": ["p", "o"] },
            JSONObject headObj = obj.get("head").isObject();
            JSONArray headVars = headObj.get("vars").isArray();
            if (headVars != null) {
                for (int i = 0; i < headVars.size(); i++) {
                    String varName = headVars.get(i).isString().stringValue();
                    head.add(varName);
                }
            }

            // "results": { "distinct": false, "ordered": true, "bindings": [ ... ]
            JSONObject resultsObj = obj.get("results").isObject();
            JSONArray bindings = resultsObj.get("bindings").isArray();
            if (bindings != null) {
                for (int i = 0; i < bindings.size(); i++) {

                    JSONObject current = bindings.get(i).isObject();
                    List<ResultItem> item = new ArrayList<ResultItem>();
                    for (int j = 0; j < head.size(); j++) {
                        JSONObject rowItem = current.get(head.get(j)).isObject();
                        String sValue = "";
                        if (rowItem.get("value") != null)
                            sValue = rowItem.get("value").isString().stringValue().trim();
                        String sType = "";
                        if (rowItem.get("type") != null)
                            sType = rowItem.get("type").isString().stringValue().trim();
                        String sLang = "";
                        if (rowItem.get("xml:lang") != null)
                            sLang = rowItem.get("xml:lang").isString().stringValue().trim();
                        String sDatatype = "";
                        if (rowItem.get("datatype") != null)
                            sDatatype = rowItem.get("datatype").isString().stringValue().trim();
                        item.add(new ResultItem(sValue, sType, sLang, sDatatype));
                    }
                    data.add(item);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception();
        }

    }

    public String getFirstResult() {
        if (data.size() > 0 && data.get(0).size() > 0)
            return data.get(0).get(0).value;
        return "";

    }
}