/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
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 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
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 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package org.scijava.io.handle;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URI;

import org.junit.Test;
import org.scijava.Context;
import org.scijava.io.location.FileLocation;
import org.scijava.io.location.Location;
import org.scijava.util.PlatformUtils;

/**
 * Tests {@link FileHandle}.
 *
 * @author Curtis Rueden
 */
public class FileHandleTest extends DataHandleTest {

	@Override
	public Class<? extends DataHandle<?>> getExpectedHandleType() {
		return FileHandle.class;
	}

	@Override
	public Location createLocation() throws IOException {
		// create and populate a temp file
		final File tmpFile = File.createTempFile("FileHandleTest", "test-file");
		tmpFile.deleteOnExit();
		populateData(new FileOutputStream(tmpFile));
		return new FileLocation(tmpFile);
	}

	@Test
	public void testExists() throws IOException {
		final Context ctx = new Context();
		final DataHandleService dhs = ctx.service(DataHandleService.class);

		final File nonExistentFile = //
			File.createTempFile("FileHandleTest", "nonexistent-file");
		final boolean deleted = delete(nonExistentFile);

		final FileLocation loc = new FileLocation(nonExistentFile);
		try (final DataHandle<?> handle = dhs.create(loc)) {
			assertTrue(handle instanceof FileHandle);
			if (deleted) {
				assertFalse(handle.exists());
				assertEquals(-1, handle.length());
			}

			handle.writeBoolean(true);
			assertTrue(handle.exists());
			assertEquals(1, handle.length());			
		}

		// Clean up.
		delete(nonExistentFile);
	}

	@Test
	public void testNotCreatedByClose() throws IOException {
		final Context ctx = new Context();
		final DataHandleService dhs = ctx.service(DataHandleService.class);

		final File nonExistentFile = //
			File.createTempFile("FileHandleTest", "nonexistent-file");
		assertTrue(nonExistentFile.delete());
		assertFalse(nonExistentFile.exists());

		final FileLocation loc = new FileLocation(nonExistentFile);
		try (final DataHandle<?> handle = dhs.create(loc)) {
			assertTrue(handle instanceof FileHandle);
			assertFalse(handle.exists());
		}
		assertFalse(nonExistentFile.exists());
	}

	@Test
	public void testNotCreatedByRead() throws IOException {
		final Context ctx = new Context();
		final DataHandleService dhs = ctx.service(DataHandleService.class);

		final File nonExistentFile = //
			File.createTempFile("FileHandleTest", "none xistent file");
		final URI uri = nonExistentFile.toURI();
		delete(nonExistentFile);

		final FileLocation loc = new FileLocation(uri);
		try (final DataHandle<?> handle = dhs.create(loc)) {
			assertFalse(handle.exists());
			handle.read(); // this will fail as there is no underlying file!
			fail("Read successfully from non-existing file!");
		}
		catch (final IOException exc) {
			// should be thrown
		}
		assertFalse(nonExistentFile.exists());
		// reading from the non-existing file should not create it!
	}

	/** A workaround for Windows being bad at deleting files. */
	private boolean delete(final File file) {
		final boolean success = file.delete();
		if (!success) file.deleteOnExit();
		if (!PlatformUtils.isWindows()) {
			assertTrue(success);
			assertFalse(file.exists());
		}
		return success;
	}
}

@@ -2065,47 +2065,8 @@
 ion;
-%0Aimport org.scijava.util.PlatformUtils;
 %0A%0A/*
@@ -2844,37 +2844,58 @@
 ;%0A%09%09
-final boolean deleted = delet
+assertTrue(nonExistentFile.delete());%0A%09%09assertFals
 e(no
@@ -2899,32 +2899,41 @@
 (nonExistentFile
+.exists()
 );%0A%0A%09%09final File
@@ -3086,27 +3086,8 @@
 e);%0A
-%09%09%09if (deleted) %7B%0A%09
 %09%09%09a
@@ -3118,17 +3118,16 @@
 ());%0A%09%09%09
-%09
 assertEq
@@ -3156,13 +3156,8 @@
 ());
-%0A%09%09%09%7D
 %0A%0A%09%09
@@ -3278,21 +3278,25 @@
 n up.%0A%09%09
-delet
+assertTru
 e(nonExi
@@ -3300,24 +3300,33 @@
 ExistentFile
+.delete()
 );%0A%09%7D%0A%0A%09@Tes
@@ -4229,21 +4229,66 @@
 RI();%0A%09%09
-delet
+assertTrue(nonExistentFile.delete());%0A%09%09assertFals
 e(nonExi
@@ -4296,16 +4296,25 @@
 tentFile
+.exists()
 );%0A%0A%09%09fi
@@ -4675,16 +4675,16 @@
 sts());%0A
+
 %09%09// rea
@@ -4743,307 +4743,7 @@
 !%0A%09%7D
-%0A%0A%09/** A workaround for Windows being bad at deleting files. */%0A%09private boolean delete(final File file) %7B%0A%09%09final boolean success = file.delete();%0A%09%09if (!success) file.deleteOnExit();%0A%09%09if (!PlatformUtils.isWindows()) %7B%0A%09%09%09assertTrue(success);%0A%09%09%09assertFalse(file.exists());%0A%09%09%7D%0A%09%09return success;%0A%09%7D
 %0A%7D%0A

Revert commit f436b7d3 (Work around Windows file deletion problems)