RDFImport.java

/*******************************************************************************
 * 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.imp.rdf;

import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import edu.isi.karma.rep.HNode;
import edu.isi.karma.rep.HTable;
import edu.isi.karma.rep.RepFactory;
import edu.isi.karma.rep.Worksheet;
import edu.isi.karma.rep.Workspace;

public class RDFImport {

	private final RepFactory factory;
	private final Worksheet worksheet;
	PrintWriter pw = null;
	private JSONArray confArr = new JSONArray();
	public static int jj = 0;

	public RDFImport(JSONArray inputSpecs, Workspace workspace,
			Worksheet worksheet) {
		super();
		this.confArr = inputSpecs;
		this.factory = workspace.getFactory();
		this.worksheet = worksheet;

	}

	private HTable addNestedHTable(HNode hNode, String key) {
		HTable ht = hNode.getNestedTable();
		if (ht == null) {
			ht = hNode.addNestedTable(createNestedTableName(key), worksheet,
					factory);
		}
		return ht;
	}

	private Map<String, String> sub(HTable headers,
			ArrayList<String> headersList, JSONArray propertyArr,
			String propertyName, String properties, Map<String, String> map) {
		HNode hNode = null;
		for (int j = 0; j < propertyArr.length(); j++) {
			JSONObject obj = propertyArr.optJSONObject(j);
			if (obj.has(propertyName)) {

				String pName = obj.optString(propertyName).toString();
				hNode = headers.addHNode(pName, worksheet, factory);

				headersList.add(hNode.getId());
				map.put(pName, hNode.getId());
			}

			if (obj.has(properties)) {
				JSONArray subArr = obj.optJSONArray(properties);
				HTable hTable = addNestedHTable(hNode, "nestedTable");
				System.out.println("nestedTable is"
						+ hNode.getNestedTable().getId());
				sub(hTable, headersList, subArr, propertyName, properties, map);
			}
		}
		return map;
	}

	public ArrayList<String> generateWorksheetFromGeneralJSON(
			Map<String, String> map) throws JSONException {

		/** Add the headers **/
		HTable headers = worksheet.getHeaders();
		ArrayList<String> headersList = new ArrayList<String>();

		String properties = "properties";
		String propertyName = "propertyName";

		for (int i = 0; i < this.confArr.length(); i++) {
			try {
				JSONArray propertyArr = this.confArr.getJSONObject(i)
						.getJSONArray(properties);
				sub(headers, headersList, propertyArr, propertyName,
						properties, map);
			} catch (JSONException e) {
				e.printStackTrace();
			}
		}

		this.pw = new PrintWriter(System.out, true);
		System.out.println("PRINTING THE HTABLE SCHEMA:");
		worksheet.getHeaders().prettyPrint("", pw, factory);// show the HTable
															// schema;
		return headersList;
	}

	private String createNestedTableName(String key) {
		return "Table for " + key;
	}

}