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package org.scijava.annotations;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.scijava.test.TestUtils.createTemporaryDirectory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLClassLoader;

import org.junit.Test;

/**
 * Verifies that the {@link EclipseHelper} does its job correctly.
 * 
 * @author Johannes Schindelin
 */
public class EclipseHelperTest {

	@Test
	public void testSkipIndexGeneration() throws Exception {
		final File dir = createTemporaryDirectory("eclipse-test-");
		copyClasses(dir, Complex.class, Simple.class);
		final File jsonDir = new File(dir, Index.INDEX_PREFIX);
		assertFalse(jsonDir.exists());
		final URLClassLoader loader =
			new URLClassLoader(new URL[] { dir.toURI().toURL() }, getClass()
				.getClassLoader().getParent());
		EclipseHelper.indexed.clear();
		EclipseHelper.updateAnnotationIndex(loader);
		assertFalse(jsonDir.exists());
	}

	@Test
	public void testIndexing() throws Exception {
		final File dir = createTemporaryDirectory("eclipse-test-");
		copyClasses(dir, Complex.class, Simple.class, Fruit.class,
			AnnotatedA.class, AnnotatedB.class, AnnotatedC.class, AnnotatedD.class);
		final File jsonDir = new File(dir, Index.INDEX_PREFIX);
		for (final Class<?> clazz : new Class<?>[] { Complex.class, Simple.class })
		{
			assertFalse(new File(jsonDir, clazz.getName()).exists());
		}
		final URLClassLoader loader =
			new URLClassLoader(new URL[] { dir.toURI().toURL() }, getClass()
				.getClassLoader().getParent())
			{

				@Override
				public Class<?> loadClass(final String className)
					throws ClassNotFoundException
				{
					if (className.equals(Indexable.class.getName())) {
						return Indexable.class;
					}
					return super.loadClass(className);
				}
			};
		EclipseHelper.indexed.clear();
		EclipseHelper.updateAnnotationIndex(loader);
		for (final Class<?> clazz : new Class<?>[] { Complex.class, Simple.class })
		{
			assertTrue(new File(jsonDir, clazz.getName()).exists());
		}
		assertEquals(2, jsonDir.list().length);

		// delete the .class files and verify that the annotation indexes are
		// deleted
		jsonDir.setLastModified(123456789);
		for (final Class<?> clazz : new Class<?>[] { AnnotatedA.class,
			AnnotatedB.class, AnnotatedC.class, AnnotatedD.class })
		{
			assertTrue(new File(dir, DirectoryIndexerTest.getResourcePath(clazz))
				.delete());
		}
		long now = System.currentTimeMillis();
		EclipseHelper.indexed.clear();
		EclipseHelper.updateAnnotationIndex(loader);
		assertEquals(0, jsonDir.list().length);
		/*
		 * Most file systems provide the mtime at second granularity, not
		 * milli-second granularity. Hence "now" might be as much as 999
		 * milliseconds ahead of the stored mtime.
		 */
		assertTrue(jsonDir.lastModified() >= now - 999);
	}

	private void copyClasses(final File dir, final Class<?>... classes)
		throws IOException
	{
		final byte[] buffer = new byte[16384];
		for (final Class<?> clazz : classes) {
			final String classPath = DirectoryIndexerTest.getResourcePath(clazz);
			final InputStream in =
				getClass().getResource("/" + classPath).openStream();
			final File outFile = new File(dir, classPath);
			final File parent = outFile.getParentFile();
			assertTrue(parent.isDirectory() || parent.mkdirs());
			final OutputStream out = new FileOutputStream(outFile);
			for (;;) {
				int count = in.read(buffer);
				if (count < 0) {
					break;
				}
				out.write(buffer, 0, count);
			}
			in.close();
			out.close();
		}
	}

}
