il.ac.bgu.cs.bp.bpjs.model.ResourceBProgram Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of BPjs Show documentation

Provides runtime and analysis for behavioral programs written in JavaScript. It can run stand-alone (from the commmandline) or be embedded in larger JVM-based systems.

The newest version!

/*
 *  Author: Michael Bar-Sinai
 */
package il.ac.bgu.cs.bp.bpjs.model;

import il.ac.bgu.cs.bp.bpjs.model.eventselection.EventSelectionStrategy;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import static java.util.stream.Collectors.joining;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;

/**
 * Convenience class for BPrograms that consist of JavaScript file stored as
 * resources in the application.
 * 
 * @author michael
 */
public class ResourceBProgram extends BProgram {
    
    private Collection resourceNames;

    public ResourceBProgram(String aResourceName, String aName, EventSelectionStrategy ess) {
        this( Collections.singletonList(aResourceName), aName, ess);
    }
    
    public ResourceBProgram(String aResourceName, EventSelectionStrategy ess) {
        this( Collections.singletonList(aResourceName), aResourceName, ess);
    }
    
    public ResourceBProgram( String... resourceNames ) {
        this( Arrays.asList(resourceNames), resourceNames[0]+"+", null );
    }
    
    public ResourceBProgram(Collection someResourceNames) {
        this(someResourceNames, someResourceNames.stream().collect(joining("+")), null);
    }
    
    public ResourceBProgram(Collection someResourceNames, String aName, EventSelectionStrategy ess) {
        super(aName, ess);        
        resourceNames = someResourceNames;
        resourceNames.forEach(this::verifyResourceExists);
    }
    
    @Override
    protected void setupProgramScope(Scriptable scope) {
        resourceNames.forEach(name->{
            try (InputStream resource = Thread.currentThread().getContextClassLoader().getResourceAsStream(name)) {
                if (resource == null) {
                    throw new RuntimeException("Resource '" + name + "' not found.");
                }
                evaluate(resource, name, Context.getCurrentContext());
            } catch (IOException ex) {
                throw new RuntimeException("Error reading resource: '" + name + "': " + ex.getMessage(), ex);
            }
        });
        
        resourceNames = null; // free memory
    }
    
    private void verifyResourceExists( String resName ) {
        URL resUrl = Thread.currentThread().getContextClassLoader().getResource(resName);
            
        if ( resUrl == null ) {
            throw new IllegalArgumentException( "Cannot find resource '" + resName + "'");    
        }
    }
    
}