/*
 * Copyright (C) 2010. All rights reserved.
 */
package ro.isdc.wro.model.factory;

import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.io.InputStream;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

import ro.isdc.wro.WroRuntimeException;
import ro.isdc.wro.config.Context;


/**
 * Test class for {@link FallbackAwareXmlModelFactory}.
 * 
 * @author Alex Objelean
 */
public class TestFallbackAwareWroModelFactory {
  private WroModelFactory xmlModelFactory;
  private WroModelFactory fallbackAwareModelFactory;
  /**
   * Used to simulate that a resource stream used to build the model is not available.
   */
  private boolean flag = false;
  
  @BeforeClass
  public static void onBeforeClass() {
    assertEquals(0, Context.countActive());
  }
  
  @AfterClass
  public static void onAfterClass() {
    assertEquals(0, Context.countActive());
  }
  
  @Before
  public void setUp() {
    // initialize the context
    Context.set(Context.standaloneContext());
    fallbackAwareModelFactory = new FallbackAwareWroModelFactory(new XmlModelFactory() {
      @Override
      protected InputStream getModelResourceAsStream()
          throws IOException {
        flag = !flag;
        if (flag) {
          return TestXmlModelFactory.class.getResourceAsStream("wro.xml");
        }
        return null;
      }
    });
    xmlModelFactory = new XmlModelFactory() {
      @Override
      protected InputStream getModelResourceAsStream()
          throws IOException {
        if (flag) {
          return super.getModelResourceAsStream();
        }
        flag = !flag;
        return null;
      }
    };
  }
  
  @After
  public void tearDown() {
    Context.unset();
    fallbackAwareModelFactory.destroy();
    xmlModelFactory.destroy();
  }
  
  @Test
  public void testLastValidIsOK() {
    Assert.assertNotNull(fallbackAwareModelFactory.create());
    fallbackAwareModelFactory.destroy();
    Assert.assertNotNull(fallbackAwareModelFactory.create());
  }
  
  @Test(expected = WroRuntimeException.class)
  public void testWithoutLastValidThrowsException() {
    Assert.assertNotNull(xmlModelFactory.create());
  }
}