jgit/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/PostOrderTreeWalkTest.java

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package org.eclipse.jgit.treewalk;

import java.io.ByteArrayInputStream;

import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheBuilder;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.dircache.DirCacheIterator;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectWriter;
import org.eclipse.jgit.lib.RepositoryTestCase;

import static org.eclipse.jgit.lib.FileMode.REGULAR_FILE;
import static org.eclipse.jgit.lib.FileMode.TREE;

public class PostOrderTreeWalkTest extends RepositoryTestCase {
	public void testInitialize_NoPostOrder() throws Exception {
		final TreeWalk tw = new TreeWalk(db);
		assertFalse(tw.isPostOrderTraversal());
	}

	public void testInitialize_TogglePostOrder() throws Exception {
		final TreeWalk tw = new TreeWalk(db);
		assertFalse(tw.isPostOrderTraversal());
		tw.setPostOrderTraversal(true);
		assertTrue(tw.isPostOrderTraversal());
		tw.setPostOrderTraversal(false);
		assertFalse(tw.isPostOrderTraversal());
	}

	public void testResetDoesNotAffectPostOrder() throws Exception {
		final TreeWalk tw = new TreeWalk(db);
		tw.setPostOrderTraversal(true);
		assertTrue(tw.isPostOrderTraversal());
		tw.reset();
		assertTrue(tw.isPostOrderTraversal());

		tw.setPostOrderTraversal(false);
		assertFalse(tw.isPostOrderTraversal());
		tw.reset();
		assertFalse(tw.isPostOrderTraversal());
	}

	public void testNoPostOrder() throws Exception {
		final DirCache tree = DirCache.read(db);
		{
			final DirCacheBuilder b = tree.builder();

			b.add(makeFile("a"));
			b.add(makeFile("b/c"));
			b.add(makeFile("b/d"));
			b.add(makeFile("q"));

			b.finish();
			assertEquals(4, tree.getEntryCount());
		}

		final TreeWalk tw = new TreeWalk(db);
		tw.reset();
		tw.setPostOrderTraversal(false);
		tw.addTree(new DirCacheIterator(tree));

		assertModes("a", REGULAR_FILE, tw);
		assertModes("b", TREE, tw);
		assertTrue(tw.isSubtree());
		assertFalse(tw.isPostChildren());
		tw.enterSubtree();
		assertModes("b/c", REGULAR_FILE, tw);
		assertModes("b/d", REGULAR_FILE, tw);
		assertModes("q", REGULAR_FILE, tw);
	}

	public void testWithPostOrder_EnterSubtree() throws Exception {
		final DirCache tree = DirCache.read(db);
		{
			final DirCacheBuilder b = tree.builder();

			b.add(makeFile("a"));
			b.add(makeFile("b/c"));
			b.add(makeFile("b/d"));
			b.add(makeFile("q"));

			b.finish();
			assertEquals(4, tree.getEntryCount());
		}

		final TreeWalk tw = new TreeWalk(db);
		tw.reset();
		tw.setPostOrderTraversal(true);
		tw.addTree(new DirCacheIterator(tree));

		assertModes("a", REGULAR_FILE, tw);

		assertModes("b", TREE, tw);
		assertTrue(tw.isSubtree());
		assertFalse(tw.isPostChildren());
		tw.enterSubtree();
		assertModes("b/c", REGULAR_FILE, tw);
		assertModes("b/d", REGULAR_FILE, tw);

		assertModes("b", TREE, tw);
		assertTrue(tw.isSubtree());
		assertTrue(tw.isPostChildren());

		assertModes("q", REGULAR_FILE, tw);
	}

	public void testWithPostOrder_NoEnterSubtree() throws Exception {
		final DirCache tree = DirCache.read(db);
		{
			final DirCacheBuilder b = tree.builder();

			b.add(makeFile("a"));
			b.add(makeFile("b/c"));
			b.add(makeFile("b/d"));
			b.add(makeFile("q"));

			b.finish();
			assertEquals(4, tree.getEntryCount());
		}

		final TreeWalk tw = new TreeWalk(db);
		tw.reset();
		tw.setPostOrderTraversal(true);
		tw.addTree(new DirCacheIterator(tree));

		assertModes("a", REGULAR_FILE, tw);

		assertModes("b", TREE, tw);
		assertTrue(tw.isSubtree());
		assertFalse(tw.isPostChildren());

		assertModes("q", REGULAR_FILE, tw);
	}

	private DirCacheEntry makeFile(final String path) throws Exception {
		final byte[] pathBytes = Constants.encode(path);
		final DirCacheEntry ent = new DirCacheEntry(path);
		ent.setFileMode(REGULAR_FILE);
		ent.setObjectId(new ObjectWriter(db).computeBlobSha1(pathBytes.length,
				new ByteArrayInputStream(pathBytes)));
		return ent;
	}

	private static void assertModes(final String path, final FileMode mode0,
			final TreeWalk tw) throws Exception {
		assertTrue("has " + path, tw.next());
		assertEquals(path, tw.getPathString());
		assertEquals(mode0, tw.getFileMode(0));
	}
}