nl.pdok.shapeprocessing.data.shapes.FeatureToTableLoader Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of pdok-shapeprocessing Show documentation
PDOK shape processing tools
The newest version!
package nl.pdok.shapeprocessing.data.shapes;

import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

public class FeatureToTableLoader{

private final static String FEATURETOTABLE = "featureToTable";
		
	@SuppressWarnings("unchecked")
	public static FeatureToTable LoadFeatureToTableFromJSON(Path featuresToTablesPath) throws Exception {
		FeatureToTable featuresToTables = new FeatureToTable();
	   	JSONObject featuresToTableJson = getJSONObject(featuresToTablesPath);    
	  	if (featuresToTableJson == null) {
	   		return featuresToTables;
	   	}
	   	try {
	   		JSONObject featuresToTablesData = (JSONObject) featuresToTableJson.get(FEATURETOTABLE);
	   		Set sources = featuresToTablesData.keySet();
	   		for(String source : sources) {
	   				Object list = featuresToTablesData.get(source);
						List tables = (List)list;
					
	   				featuresToTables.getFeatureToTables().put(source, tables);
	   		}
	   		
		   	for(Iterator iterator = featuresToTableJson.keySet().iterator(); iterator.hasNext();) {
		   	    String key = (String) iterator.next();
		   	    if(key.equals(FEATURETOTABLE)) {	
		   	    	continue;
		   	    }
		   	    
		   	    Map table = simpleJsonMapToJavaMap((JSONObject)featuresToTableJson.get(key));
		   	    featuresToTables.getTableDefinitions().put(key, table);
		   	}
	   	}
	   	catch (ClassCastException e) {
	   		throw new Exception("Invalid data");
	   	}   
	   	return  featuresToTables;
	}
	
    @SuppressWarnings("unchecked")
    private static Map simpleJsonMapToJavaMap(JSONObject featureAttributesJson) {        
    	if(featureAttributesJson == null){
    		return null;
    	}
        Map featureAttributesMap = new HashMap();
        Set types = featureAttributesJson.keySet();

        for (String type : types) {
            featureAttributesMap.put(type, (String) featureAttributesJson.get(type));
        }
        return featureAttributesMap;
    }
        
    private static JSONObject getJSONObject(Path featuresToTablesFile) throws Exception {
        JSONObject featuresToTableJson = (JSONObject) (new JSONParser()).parse(Files.newBufferedReader(featuresToTablesFile, StandardCharsets.UTF_8));
        if(featuresToTableJson == null || !featuresToTableJson.containsKey(FEATURETOTABLE)) {
        	return null;
        }
        return featuresToTableJson;
    }
    

	    

	


}