tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/NatureTest.java - platform/eclipse.platform.resources - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2015 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.tests.resources;

 import java.io.*;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 import org.eclipse.core.filesystem.EFS;
 import org.eclipse.core.filesystem.IFileStore;
 import org.eclipse.core.internal.resources.CheckMissingNaturesListener;
 import org.eclipse.core.internal.resources.File;
 import org.eclipse.core.internal.resources.PreferenceInitializer;
 import org.eclipse.core.internal.utils.FileUtil;
 import org.eclipse.core.resources.*;
 import org.eclipse.core.runtime.*;
 import org.eclipse.core.runtime.jobs.IJobManager;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.core.runtime.preferences.InstanceScope;
 import org.eclipse.core.tests.internal.resources.SimpleNature;
 import org.junit.Assert;

 /**
  * Tests all aspects of project natures.  These tests only
  * exercise API classes and methods.  Note that the nature-related
  * APIs on IWorkspace are tested by IWorkspaceTest.
  */
 public class NatureTest extends ResourceTest {
 	IProject project;

 	/**
 	 * Constructor for NatureTest.
 	 */
 	public NatureTest() {
 		super();
 	}

 	/**
 	 * Constructor for NatureTest.
 	 * @param name
 	 */
 	public NatureTest(String name) {
 		super(name);
 	}

 	public static Test suite() {
 		return new TestSuite(NatureTest.class);
 	}

 	/**
 	 * Sets the given set of natures for the project.  If success
 	 * does not match the "shouldFail" argument, an assertion error
 	 * with the given message is thrown.
 	 */
 	protected void setNatures(String message, IProject project, String[] natures, boolean shouldFail) {
 		setNatures(message, project, natures, shouldFail, false);
 	}

 	/**
 	 * Sets the given set of natures for the project.  If success
 	 * does not match the "shouldFail" argument, an assertion error
 	 * with the given message is thrown.
 	 */
 	protected void setNatures(String message, IProject project, String[] natures, boolean shouldFail, boolean silent) {
 		try {
 			IProjectDescription desc = project.getDescription();
 			desc.setNatureIds(natures);
 			int flags = IResource.KEEP_HISTORY;
 			if (silent) {
 				flags |= IResource.AVOID_NATURE_CONFIG;
 			}
 			project.setDescription(desc, flags, getMonitor());
 			if (shouldFail) {
 				fail(message);
 			}
 		} catch (CoreException e) {
 			if (!shouldFail) {
 				fail(message, e);
 			}
 		}
 	}

 	@Override
 	protected void tearDown() throws Exception {
 		project.delete(true, null);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, PreferenceInitializer.PREF_MISSING_NATURE_MARKER_SEVERITY_DEFAULT);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
 		super.tearDown();
 		getWorkspace().getRoot().refreshLocal(IResource.DEPTH_INFINITE, null);
 		ensureDoesNotExistInWorkspace(getWorkspace().getRoot());
 	}

 	@Override
 	protected void setUp() throws Exception {
 		super.setUp();
 		this.project = ResourcesPlugin.getWorkspace().getRoot().getProject(getUniqueString());
 	}

 	/**
 	 * Tests invalid additions to the set of natures for a project.
 	 */
 	public void testInvalidAdditions() {
 		ensureExistsInWorkspace(project, true);
 		setNatures("1.0", project, new String[] {NATURE_SIMPLE}, false);

 		//Adding a nature that is not available.
 		setNatures("2.0", project, new String[] {NATURE_SIMPLE, NATURE_MISSING}, true);
 		try {
 			assertTrue("2.1", project.hasNature(NATURE_SIMPLE));
 			assertTrue("2.2", !project.hasNature(NATURE_MISSING));
 			assertTrue("2.3", project.isNatureEnabled(NATURE_SIMPLE));
 			assertTrue("2.4", !project.isNatureEnabled(NATURE_MISSING));
 		} catch (CoreException e) {
 			fail("2.99", e);
 		}
 		//Adding a nature that has a missing prerequisite.
 		setNatures("3.0", project, new String[] {NATURE_SIMPLE, NATURE_SNOW}, true);
 		try {
 			assertTrue("3.1", project.hasNature(NATURE_SIMPLE));
 			assertTrue("3.2", !project.hasNature(NATURE_SNOW));
 			assertTrue("3.3", project.isNatureEnabled(NATURE_SIMPLE));
 			assertTrue("3.4", !project.isNatureEnabled(NATURE_SNOW));
 		} catch (CoreException e) {
 			fail("3.99", e);
 		}
 		//Adding a nature that creates a duplicated set member.
 		setNatures("4.0", project, new String[] {NATURE_EARTH}, false);
 		setNatures("4.1", project, new String[] {NATURE_EARTH, NATURE_WATER}, true);
 		try {
 			assertTrue("3.1", project.hasNature(NATURE_EARTH));
 			assertTrue("3.2", !project.hasNature(NATURE_WATER));
 			assertTrue("3.3", project.isNatureEnabled(NATURE_EARTH));
 			assertTrue("3.4", !project.isNatureEnabled(NATURE_WATER));
 		} catch (CoreException e) {
 			fail("3.99", e);
 		}
 	}

 	/**
 	 * Tests invalid removals from the set of natures for a project.
 	 */
 	public void testInvalidRemovals() {
 		ensureExistsInWorkspace(project, true);

 		//Removing a nature that still has dependents.
 		setNatures("1.0", project, new String[] {NATURE_WATER, NATURE_SNOW}, false);
 		setNatures("2.0", project, new String[] {NATURE_SNOW}, true);
 		try {
 			assertTrue("2.1", project.hasNature(NATURE_WATER));
 			assertTrue("2.2", project.hasNature(NATURE_SNOW));
 			assertTrue("2.3", project.isNatureEnabled(NATURE_WATER));
 			assertTrue("2.4", project.isNatureEnabled(NATURE_SNOW));
 		} catch (CoreException e) {
 			fail("2.99", e);
 		}
 	}

 	public void testNatureLifecyle() {
 		ensureExistsInWorkspace(project, true);

 		//add simple nature
 		setNatures("1.0", project, new String[] {NATURE_SIMPLE}, false);
 		SimpleNature instance = SimpleNature.getInstance();
 		assertTrue("1.1", instance.wasConfigured);
 		assertTrue("1.2", !instance.wasDeconfigured);
 		instance.reset();

 		//remove simple nature
 		setNatures("1.3", project, new String[0], false);
 		instance = SimpleNature.getInstance();
 		assertTrue("1.4", !instance.wasConfigured);
 		assertTrue("1.5", instance.wasDeconfigured);

 		//add with AVOID_NATURE_CONFIG
 		instance.reset();
 		setNatures("2.0", project, new String[] {NATURE_SIMPLE}, false, true);
 		instance = SimpleNature.getInstance();
 		assertTrue("2.1", !instance.wasConfigured);
 		assertTrue("2.2", !instance.wasDeconfigured);
 		try {
 			assertTrue("2.3", project.hasNature(NATURE_SIMPLE));
 		} catch (CoreException e) {
 			fail("1.99", e);
 		}

 		//remove with AVOID_NATURE_CONFIG
 		instance.reset();
 		setNatures("2.3", project, new String[0], false, true);
 		instance = SimpleNature.getInstance();
 		assertTrue("2.4", !instance.wasConfigured);
 		assertTrue("2.5", !instance.wasDeconfigured);
 		try {
 			assertTrue("2.6", !project.hasNature(NATURE_SIMPLE));
 		} catch (CoreException e) {
 			fail("2.99", e);
 		}
 	}

 	/**
 	 * Test simple addition and removal of natures.
 	 */
 	public void testSimpleNature() {
 		ensureExistsInWorkspace(project, true);

 		String[][] valid = getValidNatureSets();
 		for (int i = 0; i < valid.length; i++) {
 			setNatures("valid: " + i, project, valid[i], false);
 		}
 		//configure a valid nature before starting invalid tests
 		String[] currentSet = new String[] {NATURE_SIMPLE};
 		setNatures("1.0", project, currentSet, false);

 		//now do invalid tests and ensure simple nature is still configured
 		String[][] invalid = getInvalidNatureSets();
 		for (int i = 0; i < invalid.length; i++) {
 			setNatures("invalid: " + i, project, invalid[i], true);
 			try {
 				assertTrue("2.0", project.hasNature(NATURE_SIMPLE));
 				assertTrue("2.1", !project.hasNature(NATURE_EARTH));
 				assertTrue("2.2", project.isNatureEnabled(NATURE_SIMPLE));
 				assertTrue("2.3", !project.isNatureEnabled(NATURE_EARTH));
 				assertEquals("2.4", project.getDescription().getNatureIds(), currentSet);
 			} catch (CoreException e) {
 				fail("2.99", e);
 			}
 		}
 	}

 	/**
 	 * Test addition of nature that requires the workspace root.
 	 * See bugs 127562 and  128709.
 	 */
 	public void testBug127562Nature() {
 		ensureExistsInWorkspace(project, true);
 		IWorkspace ws = project.getWorkspace();

 		String[][] valid = getValidNatureSets();
 		for (int i = 0; i < valid.length; i++) {
 			setNatures("valid: " + i, project, valid[i], false);
 		}

 		// add with AVOID_NATURE_CONFIG
 		String[] currentSet = new String[] {NATURE_127562};
 		setNatures("1.0", project, currentSet, false, true);

 		// configure the nature using a conflicting scheduling rule
 		IJobManager manager = Job.getJobManager();
 		try {
 			manager.beginRule(ws.getRuleFactory().modifyRule(project), null);
 			project.getNature(NATURE_127562).configure();
 			fail("2.0");
 		} catch (CoreException ex) {
 			fail("2.1");
 		} catch (IllegalArgumentException ex) {
 			// should throw this kind of exception
 		} finally {
 			manager.endRule(ws.getRuleFactory().modifyRule(project));
 		}

 		// configure the nature using a non-conflicting scheduling rule
 		try {
 			manager.beginRule(ws.getRoot(), null);
 			project.getNature(NATURE_127562).configure();
 		} catch (CoreException ex) {
 			fail("3.0");
 		} finally {
 			manager.endRule(ws.getRoot());
 		}
 	}

 	public void testBug297871() {
 		ensureExistsInWorkspace(project, true);

 		java.io.File desc = null;
 		try {
 			IFileStore descStore = ((File) project.getFile(IProjectDescription.DESCRIPTION_FILE_NAME)).getStore();
 			desc = descStore.toLocalFile(EFS.NONE, getMonitor());
 		} catch (CoreException e) {
 			fail("1.0");
 		}

 		java.io.File descTmp = new java.io.File(desc.getPath() + ".tmp");
 		try {
 			copy(desc, descTmp);
 		} catch (IOException e) {
 			fail("2.0", e);
 		}

 		setNatures("valid ", project, new String[] {NATURE_EARTH}, false);

 		try {
 			assertNotNull(project.getNature(NATURE_EARTH));
 		} catch (CoreException e) {
 			fail("3.0", e);
 		}

 		try {
 			assertTrue(project.hasNature(NATURE_EARTH));
 		} catch (CoreException e) {
 			fail("4.0", e);
 		}

 		try {
 			// Make sure enough time has past to bump file's
 			// timestamp during the copy
 			Thread.sleep(1000);
 		} catch (InterruptedException e) {
 			fail("5.0", e);
 		}

 		try {
 			copy(descTmp, desc);
 		} catch (IOException e) {
 			fail("6.0", e);
 		}

 		try {
 			project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
 		} catch (CoreException e) {
 			fail("7.0", e);
 		}

 		try {
 			assertNull(project.getNature(NATURE_EARTH));
 		} catch (CoreException e) {
 			fail("8.0", e);
 		}

 		try {
 			assertFalse(project.hasNature(NATURE_EARTH));
 		} catch (CoreException e) {
 			fail("9.0", e);
 		}
 	}

 	private void copy(java.io.File src, java.io.File dst) throws IOException {
 		InputStream in = new FileInputStream(src);
 		OutputStream out = new FileOutputStream(dst);

 		byte[] buffer = new byte[1024];
 		int read;
 		while ((read = in.read(buffer)) > 0) {
 			out.write(buffer, 0, read);
 		}
 		in.close();
 		out.close();
 	}

 	/**
 	 * Changes project description and parallel checks {@link IProject#isNatureEnabled(String)},
 	 * to check if natures value is cached properly.
 	 *
 	 * See Bug 338055.
 	 * @throws Exception
 	 */
 	public void testBug338055() throws Exception {
 		final boolean finished[] = new boolean[] {false};
 		ensureExistsInWorkspace(project, true);

 		new Job("CheckNatureJob") {
 			@Override
 			protected IStatus run(IProgressMonitor monitor) {
 				try {
 					if (finished[0] == false) {
 						if (project.exists() && project.isOpen()) {
 							project.isNatureEnabled(NATURE_SIMPLE);
 						}
 						schedule();
 					}
 				} catch (CoreException e) {
 					fail("CheckNatureJob failed", e);
 				}
 				return Status.OK_STATUS;
 			}
 		}.schedule();

 		try {
 			// Make sure enough time has past to bump file's
 			// timestamp during the copy
 			Thread.sleep(1000);
 		} catch (InterruptedException e) {
 			fail("2.0", e);
 		}

 		IFileStore descStore = ((File) project.getFile(IProjectDescription.DESCRIPTION_FILE_NAME)).getStore();

 		// create a description with many natures, this will make updating description longer
 		StringBuilder description = new StringBuilder();
 		description.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?><projectDescription><name></name><comment></comment><projects></projects><buildSpec></buildSpec><natures>");
 		description.append("<nature>" + NATURE_SIMPLE + "</nature>");
 		for (int i = 0; i < 100; i++) {
 			description.append("<nature>nature" + i + "</nature>");
 		}
 		description.append("</natures></projectDescription>\n");

 		// write the description
 		OutputStream output = null;
 		try {
 			output = descStore.openOutputStream(EFS.NONE, getMonitor());
 			output.write(description.toString().getBytes());
 		} catch (CoreException e) {
 			fail("1.0");
 		} finally {
 			FileUtil.safeClose(output);
 		}

 		try {
 			project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
 		} catch (CoreException e) {
 			fail("3.0", e);
 		}

 		finished[0] = true;

 		assertTrue("4.0", project.hasNature(NATURE_SIMPLE));
 		assertTrue("5.0", project.isNatureEnabled(NATURE_SIMPLE));
 	}

 	public void testMissingNatureAddsMarker() throws Exception {
 		ensureExistsInWorkspace(project, true);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_WARNING);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
 		IProjectDescription desc = project.getDescription();
 		desc.setNatureIds(new String[] {NATURE_MISSING});
 		project.setDescription(desc, IResource.FORCE | IResource.AVOID_NATURE_CONFIG, getMonitor());
 		project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
 		project.build(IncrementalProjectBuilder.FULL_BUILD, getMonitor());
 		Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
 		IMarker[] markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
 		Assert.assertEquals(1, markers.length);
 		IMarker marker = markers[0];
 		Assert.assertEquals(NATURE_MISSING, marker.getAttribute("natureId"));
 		Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_START, -42));
 		Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_END, -42));
 		try (ByteArrayOutputStream bos = new ByteArrayOutputStream(); InputStream input = ((IFile) marker.getResource()).getContents()) {
 			FileUtil.transferStreams(input, bos, "whatever", getMonitor());
 			String marked = bos.toString().substring(marker.getAttribute(IMarker.CHAR_START, -42), marker.getAttribute(IMarker.CHAR_END, -42) + 1);
 			Assert.assertEquals(NATURE_MISSING, marked);
 		}
 	}

 	public void testMissingNatureWithWhitespacesSetChars() throws Exception {
 		ensureExistsInWorkspace(project, true);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_WARNING);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
 		IFile dotProjectFile = project.getFile(IProjectDescription.DESCRIPTION_FILE_NAME);
 		dotProjectFile.setContents(new ByteArrayInputStream(("<projectDescription><name>" + project.getName() + "</name><natures><nature> " + NATURE_MISSING + "  </nature></natures></projectDescription>").getBytes()), false, false, getMonitor());
 		project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
 		project.build(IncrementalProjectBuilder.FULL_BUILD, getMonitor());
 		Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
 		IMarker[] markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
 		Assert.assertEquals(1, markers.length);
 		IMarker marker = markers[0];
 		Assert.assertEquals(NATURE_MISSING, marker.getAttribute("natureId"));
 		Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_START, -42));
 		Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_END, -42));
 		try (ByteArrayOutputStream bos = new ByteArrayOutputStream(); InputStream input = ((IFile) marker.getResource()).getContents()) {
 			FileUtil.transferStreams(input, bos, "whatever", getMonitor());
 			String marked = bos.toString().substring(marker.getAttribute(IMarker.CHAR_START, -42), marker.getAttribute(IMarker.CHAR_END, -42) + 1);
 			Assert.assertEquals(NATURE_MISSING, marked);
 		}
 	}

 	public void testKnownNatureDoesntAddMarker() throws Exception {
 		ensureExistsInWorkspace(project, true);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_WARNING);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
 		IProjectDescription desc = project.getDescription();
 		desc.setNatureIds(new String[] {NATURE_SIMPLE});
 		project.setDescription(desc, getMonitor());
 		project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
 		project.build(IncrementalProjectBuilder.FULL_BUILD, getMonitor());
 		Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
 		Assert.assertEquals(0, project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE).length);
 	}

 	public void testListenToPreferenceChange() throws Exception {
 		testMissingNatureAddsMarker();
 		// to INFO
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_INFO);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
 		Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
 		IMarker[] markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
 		Assert.assertEquals(1, markers.length);
 		Assert.assertEquals(IMarker.SEVERITY_INFO, markers[0].getAttribute(IMarker.SEVERITY, -42));
 		// to IGNORE
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, -1);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
 		Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
 		markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
 		Assert.assertEquals(0, markers.length);
 		// to ERROR
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_ERROR);
 		InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
 		Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
 		markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
 		Assert.assertEquals(1, markers.length);
 		Assert.assertEquals(IMarker.SEVERITY_ERROR, markers[0].getAttribute(IMarker.SEVERITY, -42));
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2015 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.core.tests.resources;

	import java.io.*;
	import junit.framework.Test;
	import junit.framework.TestSuite;
	import org.eclipse.core.filesystem.EFS;
	import org.eclipse.core.filesystem.IFileStore;
	import org.eclipse.core.internal.resources.CheckMissingNaturesListener;
	import org.eclipse.core.internal.resources.File;
	import org.eclipse.core.internal.resources.PreferenceInitializer;
	import org.eclipse.core.internal.utils.FileUtil;
	import org.eclipse.core.resources.*;
	import org.eclipse.core.runtime.*;
	import org.eclipse.core.runtime.jobs.IJobManager;
	import org.eclipse.core.runtime.jobs.Job;
	import org.eclipse.core.runtime.preferences.InstanceScope;
	import org.eclipse.core.tests.internal.resources.SimpleNature;
	import org.junit.Assert;

	/**
	* Tests all aspects of project natures. These tests only
	* exercise API classes and methods. Note that the nature-related
	* APIs on IWorkspace are tested by IWorkspaceTest.
	*/
	public class NatureTest extends ResourceTest {
	IProject project;

	/**
	* Constructor for NatureTest.
	*/
	public NatureTest() {
	super();
	}

	/**
	* Constructor for NatureTest.
	* @param name
	*/
	public NatureTest(String name) {
	super(name);
	}

	public static Test suite() {
	return new TestSuite(NatureTest.class);
	}

	/**
	* Sets the given set of natures for the project. If success
	* does not match the "shouldFail" argument, an assertion error
	* with the given message is thrown.
	*/
	protected void setNatures(String message, IProject project, String[] natures, boolean shouldFail) {
	setNatures(message, project, natures, shouldFail, false);
	}

	/**
	* Sets the given set of natures for the project. If success
	* does not match the "shouldFail" argument, an assertion error
	* with the given message is thrown.
	*/
	protected void setNatures(String message, IProject project, String[] natures, boolean shouldFail, boolean silent) {
	try {
	IProjectDescription desc = project.getDescription();
	desc.setNatureIds(natures);
	int flags = IResource.KEEP_HISTORY;
	if (silent) {
	flags \|= IResource.AVOID_NATURE_CONFIG;
	}
	project.setDescription(desc, flags, getMonitor());
	if (shouldFail) {
	fail(message);
	}
	} catch (CoreException e) {
	if (!shouldFail) {
	fail(message, e);
	}
	}
	}

	@Override
	protected void tearDown() throws Exception {
	project.delete(true, null);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, PreferenceInitializer.PREF_MISSING_NATURE_MARKER_SEVERITY_DEFAULT);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
	super.tearDown();
	getWorkspace().getRoot().refreshLocal(IResource.DEPTH_INFINITE, null);
	ensureDoesNotExistInWorkspace(getWorkspace().getRoot());
	}

	@Override
	protected void setUp() throws Exception {
	super.setUp();
	this.project = ResourcesPlugin.getWorkspace().getRoot().getProject(getUniqueString());
	}

	/**
	* Tests invalid additions to the set of natures for a project.
	*/
	public void testInvalidAdditions() {
	ensureExistsInWorkspace(project, true);
	setNatures("1.0", project, new String[] {NATURE_SIMPLE}, false);

	//Adding a nature that is not available.
	setNatures("2.0", project, new String[] {NATURE_SIMPLE, NATURE_MISSING}, true);
	try {
	assertTrue("2.1", project.hasNature(NATURE_SIMPLE));
	assertTrue("2.2", !project.hasNature(NATURE_MISSING));
	assertTrue("2.3", project.isNatureEnabled(NATURE_SIMPLE));
	assertTrue("2.4", !project.isNatureEnabled(NATURE_MISSING));
	} catch (CoreException e) {
	fail("2.99", e);
	}
	//Adding a nature that has a missing prerequisite.
	setNatures("3.0", project, new String[] {NATURE_SIMPLE, NATURE_SNOW}, true);
	try {
	assertTrue("3.1", project.hasNature(NATURE_SIMPLE));
	assertTrue("3.2", !project.hasNature(NATURE_SNOW));
	assertTrue("3.3", project.isNatureEnabled(NATURE_SIMPLE));
	assertTrue("3.4", !project.isNatureEnabled(NATURE_SNOW));
	} catch (CoreException e) {
	fail("3.99", e);
	}
	//Adding a nature that creates a duplicated set member.
	setNatures("4.0", project, new String[] {NATURE_EARTH}, false);
	setNatures("4.1", project, new String[] {NATURE_EARTH, NATURE_WATER}, true);
	try {
	assertTrue("3.1", project.hasNature(NATURE_EARTH));
	assertTrue("3.2", !project.hasNature(NATURE_WATER));
	assertTrue("3.3", project.isNatureEnabled(NATURE_EARTH));
	assertTrue("3.4", !project.isNatureEnabled(NATURE_WATER));
	} catch (CoreException e) {
	fail("3.99", e);
	}
	}

	/**
	* Tests invalid removals from the set of natures for a project.
	*/
	public void testInvalidRemovals() {
	ensureExistsInWorkspace(project, true);

	//Removing a nature that still has dependents.
	setNatures("1.0", project, new String[] {NATURE_WATER, NATURE_SNOW}, false);
	setNatures("2.0", project, new String[] {NATURE_SNOW}, true);
	try {
	assertTrue("2.1", project.hasNature(NATURE_WATER));
	assertTrue("2.2", project.hasNature(NATURE_SNOW));
	assertTrue("2.3", project.isNatureEnabled(NATURE_WATER));
	assertTrue("2.4", project.isNatureEnabled(NATURE_SNOW));
	} catch (CoreException e) {
	fail("2.99", e);
	}
	}

	public void testNatureLifecyle() {
	ensureExistsInWorkspace(project, true);

	//add simple nature
	setNatures("1.0", project, new String[] {NATURE_SIMPLE}, false);
	SimpleNature instance = SimpleNature.getInstance();
	assertTrue("1.1", instance.wasConfigured);
	assertTrue("1.2", !instance.wasDeconfigured);
	instance.reset();

	//remove simple nature
	setNatures("1.3", project, new String[0], false);
	instance = SimpleNature.getInstance();
	assertTrue("1.4", !instance.wasConfigured);
	assertTrue("1.5", instance.wasDeconfigured);

	//add with AVOID_NATURE_CONFIG
	instance.reset();
	setNatures("2.0", project, new String[] {NATURE_SIMPLE}, false, true);
	instance = SimpleNature.getInstance();
	assertTrue("2.1", !instance.wasConfigured);
	assertTrue("2.2", !instance.wasDeconfigured);
	try {
	assertTrue("2.3", project.hasNature(NATURE_SIMPLE));
	} catch (CoreException e) {
	fail("1.99", e);
	}

	//remove with AVOID_NATURE_CONFIG
	instance.reset();
	setNatures("2.3", project, new String[0], false, true);
	instance = SimpleNature.getInstance();
	assertTrue("2.4", !instance.wasConfigured);
	assertTrue("2.5", !instance.wasDeconfigured);
	try {
	assertTrue("2.6", !project.hasNature(NATURE_SIMPLE));
	} catch (CoreException e) {
	fail("2.99", e);
	}
	}

	/**
	* Test simple addition and removal of natures.
	*/
	public void testSimpleNature() {
	ensureExistsInWorkspace(project, true);

	String[][] valid = getValidNatureSets();
	for (int i = 0; i < valid.length; i++) {
	setNatures("valid: " + i, project, valid[i], false);
	}
	//configure a valid nature before starting invalid tests
	String[] currentSet = new String[] {NATURE_SIMPLE};
	setNatures("1.0", project, currentSet, false);

	//now do invalid tests and ensure simple nature is still configured
	String[][] invalid = getInvalidNatureSets();
	for (int i = 0; i < invalid.length; i++) {
	setNatures("invalid: " + i, project, invalid[i], true);
	try {
	assertTrue("2.0", project.hasNature(NATURE_SIMPLE));
	assertTrue("2.1", !project.hasNature(NATURE_EARTH));
	assertTrue("2.2", project.isNatureEnabled(NATURE_SIMPLE));
	assertTrue("2.3", !project.isNatureEnabled(NATURE_EARTH));
	assertEquals("2.4", project.getDescription().getNatureIds(), currentSet);
	} catch (CoreException e) {
	fail("2.99", e);
	}
	}
	}

	/**
	* Test addition of nature that requires the workspace root.
	* See bugs 127562 and 128709.
	*/
	public void testBug127562Nature() {
	ensureExistsInWorkspace(project, true);
	IWorkspace ws = project.getWorkspace();

	String[][] valid = getValidNatureSets();
	for (int i = 0; i < valid.length; i++) {
	setNatures("valid: " + i, project, valid[i], false);
	}

	// add with AVOID_NATURE_CONFIG
	String[] currentSet = new String[] {NATURE_127562};
	setNatures("1.0", project, currentSet, false, true);

	// configure the nature using a conflicting scheduling rule
	IJobManager manager = Job.getJobManager();
	try {
	manager.beginRule(ws.getRuleFactory().modifyRule(project), null);
	project.getNature(NATURE_127562).configure();
	fail("2.0");
	} catch (CoreException ex) {
	fail("2.1");
	} catch (IllegalArgumentException ex) {
	// should throw this kind of exception
	} finally {
	manager.endRule(ws.getRuleFactory().modifyRule(project));
	}

	// configure the nature using a non-conflicting scheduling rule
	try {
	manager.beginRule(ws.getRoot(), null);
	project.getNature(NATURE_127562).configure();
	} catch (CoreException ex) {
	fail("3.0");
	} finally {
	manager.endRule(ws.getRoot());
	}
	}

	public void testBug297871() {
	ensureExistsInWorkspace(project, true);

	java.io.File desc = null;
	try {
	IFileStore descStore = ((File) project.getFile(IProjectDescription.DESCRIPTION_FILE_NAME)).getStore();
	desc = descStore.toLocalFile(EFS.NONE, getMonitor());
	} catch (CoreException e) {
	fail("1.0");
	}

	java.io.File descTmp = new java.io.File(desc.getPath() + ".tmp");
	try {
	copy(desc, descTmp);
	} catch (IOException e) {
	fail("2.0", e);
	}

	setNatures("valid ", project, new String[] {NATURE_EARTH}, false);

	try {
	assertNotNull(project.getNature(NATURE_EARTH));
	} catch (CoreException e) {
	fail("3.0", e);
	}

	try {
	assertTrue(project.hasNature(NATURE_EARTH));
	} catch (CoreException e) {
	fail("4.0", e);
	}

	try {
	// Make sure enough time has past to bump file's
	// timestamp during the copy
	Thread.sleep(1000);
	} catch (InterruptedException e) {
	fail("5.0", e);
	}

	try {
	copy(descTmp, desc);
	} catch (IOException e) {
	fail("6.0", e);
	}

	try {
	project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
	} catch (CoreException e) {
	fail("7.0", e);
	}

	try {
	assertNull(project.getNature(NATURE_EARTH));
	} catch (CoreException e) {
	fail("8.0", e);
	}

	try {
	assertFalse(project.hasNature(NATURE_EARTH));
	} catch (CoreException e) {
	fail("9.0", e);
	}
	}

	private void copy(java.io.File src, java.io.File dst) throws IOException {
	InputStream in = new FileInputStream(src);
	OutputStream out = new FileOutputStream(dst);

	byte[] buffer = new byte[1024];
	int read;
	while ((read = in.read(buffer)) > 0) {
	out.write(buffer, 0, read);
	}
	in.close();
	out.close();
	}

	/**
	* Changes project description and parallel checks {@link IProject#isNatureEnabled(String)},
	* to check if natures value is cached properly.
	*
	* See Bug 338055.
	* @throws Exception
	*/
	public void testBug338055() throws Exception {
	final boolean finished[] = new boolean[] {false};
	ensureExistsInWorkspace(project, true);

	new Job("CheckNatureJob") {
	@Override
	protected IStatus run(IProgressMonitor monitor) {
	try {
	if (finished[0] == false) {
	if (project.exists() && project.isOpen()) {
	project.isNatureEnabled(NATURE_SIMPLE);
	}
	schedule();
	}
	} catch (CoreException e) {
	fail("CheckNatureJob failed", e);
	}
	return Status.OK_STATUS;
	}
	}.schedule();

	try {
	// Make sure enough time has past to bump file's
	// timestamp during the copy
	Thread.sleep(1000);
	} catch (InterruptedException e) {
	fail("2.0", e);
	}

	IFileStore descStore = ((File) project.getFile(IProjectDescription.DESCRIPTION_FILE_NAME)).getStore();

	// create a description with many natures, this will make updating description longer
	StringBuilder description = new StringBuilder();
	description.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?><projectDescription><name></name><comment></comment><projects></projects><buildSpec></buildSpec><natures>");
	description.append("<nature>" + NATURE_SIMPLE + "</nature>");
	for (int i = 0; i < 100; i++) {
	description.append("<nature>nature" + i + "</nature>");
	}
	description.append("</natures></projectDescription>\n");

	// write the description
	OutputStream output = null;
	try {
	output = descStore.openOutputStream(EFS.NONE, getMonitor());
	output.write(description.toString().getBytes());
	} catch (CoreException e) {
	fail("1.0");
	} finally {
	FileUtil.safeClose(output);
	}

	try {
	project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
	} catch (CoreException e) {
	fail("3.0", e);
	}

	finished[0] = true;

	assertTrue("4.0", project.hasNature(NATURE_SIMPLE));
	assertTrue("5.0", project.isNatureEnabled(NATURE_SIMPLE));
	}

	public void testMissingNatureAddsMarker() throws Exception {
	ensureExistsInWorkspace(project, true);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_WARNING);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
	IProjectDescription desc = project.getDescription();
	desc.setNatureIds(new String[] {NATURE_MISSING});
	project.setDescription(desc, IResource.FORCE \| IResource.AVOID_NATURE_CONFIG, getMonitor());
	project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
	project.build(IncrementalProjectBuilder.FULL_BUILD, getMonitor());
	Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
	IMarker[] markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
	Assert.assertEquals(1, markers.length);
	IMarker marker = markers[0];
	Assert.assertEquals(NATURE_MISSING, marker.getAttribute("natureId"));
	Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_START, -42));
	Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_END, -42));
	try (ByteArrayOutputStream bos = new ByteArrayOutputStream(); InputStream input = ((IFile) marker.getResource()).getContents()) {
	FileUtil.transferStreams(input, bos, "whatever", getMonitor());
	String marked = bos.toString().substring(marker.getAttribute(IMarker.CHAR_START, -42), marker.getAttribute(IMarker.CHAR_END, -42) + 1);
	Assert.assertEquals(NATURE_MISSING, marked);
	}
	}

	public void testMissingNatureWithWhitespacesSetChars() throws Exception {
	ensureExistsInWorkspace(project, true);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_WARNING);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
	IFile dotProjectFile = project.getFile(IProjectDescription.DESCRIPTION_FILE_NAME);
	dotProjectFile.setContents(new ByteArrayInputStream(("<projectDescription><name>" + project.getName() + "</name><natures><nature> " + NATURE_MISSING + " </nature></natures></projectDescription>").getBytes()), false, false, getMonitor());
	project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
	project.build(IncrementalProjectBuilder.FULL_BUILD, getMonitor());
	Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
	IMarker[] markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
	Assert.assertEquals(1, markers.length);
	IMarker marker = markers[0];
	Assert.assertEquals(NATURE_MISSING, marker.getAttribute("natureId"));
	Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_START, -42));
	Assert.assertNotEquals(-42, marker.getAttribute(IMarker.CHAR_END, -42));
	try (ByteArrayOutputStream bos = new ByteArrayOutputStream(); InputStream input = ((IFile) marker.getResource()).getContents()) {
	FileUtil.transferStreams(input, bos, "whatever", getMonitor());
	String marked = bos.toString().substring(marker.getAttribute(IMarker.CHAR_START, -42), marker.getAttribute(IMarker.CHAR_END, -42) + 1);
	Assert.assertEquals(NATURE_MISSING, marked);
	}
	}

	public void testKnownNatureDoesntAddMarker() throws Exception {
	ensureExistsInWorkspace(project, true);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_WARNING);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
	IProjectDescription desc = project.getDescription();
	desc.setNatureIds(new String[] {NATURE_SIMPLE});
	project.setDescription(desc, getMonitor());
	project.refreshLocal(IResource.DEPTH_INFINITE, getMonitor());
	project.build(IncrementalProjectBuilder.FULL_BUILD, getMonitor());
	Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
	Assert.assertEquals(0, project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE).length);
	}

	public void testListenToPreferenceChange() throws Exception {
	testMissingNatureAddsMarker();
	// to INFO
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_INFO);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
	Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
	IMarker[] markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
	Assert.assertEquals(1, markers.length);
	Assert.assertEquals(IMarker.SEVERITY_INFO, markers[0].getAttribute(IMarker.SEVERITY, -42));
	// to IGNORE
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, -1);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
	Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
	markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
	Assert.assertEquals(0, markers.length);
	// to ERROR
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).putInt(ResourcesPlugin.PREF_MISSING_NATURE_MARKER_SEVERITY, IMarker.SEVERITY_ERROR);
	InstanceScope.INSTANCE.getNode(ResourcesPlugin.PI_RESOURCES).flush();
	Job.getJobManager().join(CheckMissingNaturesListener.MARKER_TYPE, getMonitor());
	markers = project.findMarkers(CheckMissingNaturesListener.MARKER_TYPE, false, IResource.DEPTH_ONE);
	Assert.assertEquals(1, markers.length);
	Assert.assertEquals(IMarker.SEVERITY_ERROR, markers[0].getAttribute(IMarker.SEVERITY, -42));
	}
	}