package org.simantics.document.server.request;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.simantics.db.ReadGraph;
import org.simantics.db.common.request.UnaryRead;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.variable.Variable;
import org.simantics.db.layer0.variable.Variables;
import org.simantics.document.server.JSONObject;

public class URIDocumentRequest extends UnaryRead<String, List<JSONObject>> {

    public URIDocumentRequest(String var) {
        super(var);
	}

	@Override
	public List<JSONObject> perform(ReadGraph graph) throws DatabaseException {
		
		Variable var = Variables.getPossibleVariable(graph, parameter);
		if(var == null) {
			Variables.getPossibleVariable(graph, parameter);
			return Collections.emptyList();
		}
		
		ArrayList<JSONObject> result = new ArrayList<JSONObject>(graph.syncRequest(new DocumentRequest(var)));
		Collections.sort(result, new Comparator<JSONObject>() {

			@Override
			public int compare(JSONObject o1, JSONObject o2) {
				return o1.id.compareTo(o2.id);
			}
			
		});
		return result;
				
	}
	
}