package org.gcube.common.scope;

import static org.junit.Assert.*;

import java.net.URL;
import java.net.URLClassLoader;

import org.gcube.common.scope.api.ScopeProvider;
import org.junit.After;
import org.junit.Test;

public class ConfigurationTest {

	private ClassLoader loader = Thread.currentThread().getContextClassLoader();
	
	@Test
	public void alternativeProvidersCanBeConfigured() {
		
		addJarToClasspath("alternativeprovider.jar");
		
		assertEquals("AlternativeScopeProvider",ScopeProvider.instance.getClass().getSimpleName());
	}
	
	@Test
	public void multipleAlternativeProvidersCannotBeConfigured() {
		
		try {
			addJarToClasspath("multiplealternativeproviders.jar");
			ScopeProvider.instance.set("shouldfail");
			fail();
		}
		catch(Error e) {}
		
	}
	
	private void addJarToClasspath(String jar) {
		
		URL jarURL = loader.getResource(jar);
		
		URLClassLoader urlClassLoader
		 = new URLClassLoader(new URL[]{jarURL},loader);
		
		Thread.currentThread().setContextClassLoader(urlClassLoader);
		
	}
	
	@After
	public void teardown() {
		Thread.currentThread().setContextClassLoader(loader);
	}
}