LoadPrologCode.java

package eu.play_project.dcep.distributedetalis.configurations.helpers;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Serializable;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Pattern;

import eu.play_project.dcep.distributedetalis.PlayJplEngineWrapper;
import eu.play_project.dcep.distributedetalis.api.DistributedEtalisException;

/**
 * Load prolog code form files in class path and add it to engine.
 * @author Stefan Obermeier
 *
 */
public class LoadPrologCode implements Serializable {
	
	private static final long serialVersionUID = 100L;

	public LoadPrologCode(){}
	
	public void loadCode(String fliename, PlayJplEngineWrapper engine) throws IOException, DistributedEtalisException {
		List<String> methods= getPrologMethods(fliename);
		
		//Add methods to engine.
		for (String code : methods) {
			engine.execute("assert((" + code + "))");
		}
	}
	
	// Get code from file and seperate different methods.
	private  List<String> getPrologMethods(String methodFile) throws IOException{
		List<String> result = new LinkedList<String>();

			InputStream is = this.getClass().getClassLoader().getResourceAsStream(methodFile);
			BufferedReader br =new BufferedReader(new InputStreamReader(is));
			StringBuffer sb = new StringBuffer();
			String line;
			
			while (null != (line = br.readLine())) {
				if (!(line.equals(" "))) {
					if (!line.startsWith("%")) { // Ignore comments
						sb.append(line.split("%")[0]); //Ignore rest of the line if comment starts.
					}
				}
			}

			br.close();
			is.close();
			
			String[] methods = sb.toString().split(Pattern.quote( "." ) ); // Dot defines a new method.
			for (String m : methods) {
				if(!m.trim().equals("")){ // Do not add empty lines.
					result.add(m);
				}
			}
			return result;
	}


}