Remove deprecated Repository.mapTree

The mapTree() routines have been deprecated for a long time, and their
sibilings for mapCommit() and mapTag() were already removed from the
main Repository API.

Remove mapTree().  Application callers who only need the tree's name
can use resolve("^{tree}") syntax to resolve to the tree ObjectId, or
fail if the input is not a tree.

Applications that want to read a tree should use DirCache or TreeWalk.

Change-Id: I85726413790fc87721271c482f6636f81baf8b82
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit.test/exttst/org/eclipse/jgit/lib/T0007_GitIndexTest.java

 		assertEquals("c696abc3ab8e091c665f49d00eb8919690b3aec3", id.name());
 		GitIndex index2 = new GitIndex(db);
 
-		index2.readTree(db.mapTree(ObjectId.fromString(
-				"c696abc3ab8e091c665f49d00eb8919690b3aec3")));
+		index2.readTree(mapTree("c696abc3ab8e091c665f49d00eb8919690b3aec3"));
 		Entry[] members = index2.getMembers();
 		assertEquals(3, members.length);
 		assertEquals("a.b", members[0].getName());
 		assertEquals("ba78e065e2c261d4f7b8f42107588051e87e18e9", id.name());
 		GitIndex index2 = new GitIndex(db);
 
-		index2.readTree(db.mapTree(ObjectId.fromString(
-				"ba78e065e2c261d4f7b8f42107588051e87e18e9")));
+		index2.readTree(mapTree("ba78e065e2c261d4f7b8f42107588051e87e18e9"));
 		Entry[] members = index2.getMembers();
 		assertEquals(6, members.length);
 		assertEquals("a.b", members[0].getName());
 		GitIndex index2 = new GitIndex(db);
 		assertEquals(0, index2.getMembers().length);
 
-		index2.readTree(db.mapTree(ObjectId.fromString(
-				"c696abc3ab8e091c665f49d00eb8919690b3aec3")));
+		index2.readTree(mapTree("c696abc3ab8e091c665f49d00eb8919690b3aec3"));
 
 		index2.checkout(trash);
 		assertEquals("data:a/b", read(aslashb));
 			index.filemode = Boolean.TRUE; // TODO: we need a way to set this using config
 			index.add(trash, execFile);
 			index.add(trash, nonexecFile);
-			Tree tree = db.mapTree(index.writeTree());
+			Tree tree = mapTree(index.writeTree().name());
 			assertEquals(FileMode.EXECUTABLE_FILE, tree.findBlobMember(execFile.getName()).getMode());
 			assertEquals(FileMode.REGULAR_FILE, tree.findBlobMember(nonexecFile.getName()).getMode());
 
 			index.filemode = Boolean.FALSE; // TODO: we need a way to set this using config
 			index.add(trash, execFile);
 			index.add(trash, nonexecFile);
-			Tree tree = db.mapTree(index.writeTree());
+			Tree tree = mapTree(index.writeTree().name());
 			assertEquals(FileMode.REGULAR_FILE, tree.findBlobMember(execFile.getName()).getMode());
 			assertEquals(FileMode.REGULAR_FILE, tree.findBlobMember(nonexecFile.getName()).getMode());
 
 		write(path, body);
 		return path;
 	}
+
+	private Tree mapTree(String name) throws IOException {
+		ObjectId id = db.resolve(name + "^{tree}");
+		return new Tree(db, id, db.open(id).getCachedBytes());
+	}
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/T0002_TreeTest.java

 
 	@Test
 	public void test009_SymlinkAndGitlink() throws IOException {
-		final Tree symlinkTree = db.mapTree("symlink");
+		final Tree symlinkTree = mapTree("symlink");
 		assertTrue("Symlink entry exists", symlinkTree.existsBlob("symlink.txt"));
-		final Tree gitlinkTree = db.mapTree("gitlink");
+		final Tree gitlinkTree = mapTree("gitlink");
 		assertTrue("Gitlink entry exists", gitlinkTree.existsBlob("submodule"));
 	}
+
+	private Tree mapTree(String name) throws IOException {
+		ObjectId id = db.resolve(name + "^{tree}");
+		return new Tree(db, id, db.open(id).getCachedBytes());
+	}
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/SimpleMergeTest.java

 		Merger ourMerger = MergeStrategy.OURS.newMerger(db);
 		boolean merge = ourMerger.merge(new ObjectId[] { db.resolve("a"), db.resolve("c") });
 		assertTrue(merge);
-		assertEquals(db.mapTree("a").getId(), ourMerger.getResultTreeId());
+		assertEquals(db.resolve("a^{tree}"), ourMerger.getResultTreeId());
 	}
 
 	@Test
 		Merger ourMerger = MergeStrategy.THEIRS.newMerger(db);
 		boolean merge = ourMerger.merge(new ObjectId[] { db.resolve("a"), db.resolve("c") });
 		assertTrue(merge);
-		assertEquals(db.mapTree("c").getId(), ourMerger.getResultTreeId());
+		assertEquals(db.resolve("c^{tree}"), ourMerger.getResultTreeId());
 	}
 
 	@Test
 		Merger ourMerger = MergeStrategy.SIMPLE_TWO_WAY_IN_CORE.newMerger(db);
 		boolean merge = ourMerger.merge(new ObjectId[] { db.resolve("a^0^0^0"), db.resolve("a^0^0^1") });
 		assertTrue(merge);
-		assertEquals(db.mapTree("a^0^0").getId(), ourMerger.getResultTreeId());
+		assertEquals(db.resolve("a^0^0^{tree}"), ourMerger.getResultTreeId());
 	}
 
 	@Test

org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java

 		return getObjectDatabase().open(objectId, typeHint);
 	}
 
-	/**
-	 * Access a Tree object using a symbolic reference. This reference may
-	 * be a SHA-1 or ref in combination with a number of symbols translating
-	 * from one ref or SHA1-1 to another, such as HEAD^{tree} etc.
-	 *
-	 * @param revstr a reference to a git commit object
-	 * @return a Tree named by the specified string
-	 * @throws IOException
-	 *
-	 * @see #resolve(String)
-	 * @deprecated Use {@link #resolve(String)} and pass its return value to
-	 * {@link org.eclipse.jgit.treewalk.TreeWalk#addTree(AnyObjectId)}.
-	 */
-	@Deprecated
-	public Tree mapTree(final String revstr) throws IOException {
-		final ObjectId id = resolve(revstr);
-		return id != null ? mapTree(id) : null;
-	}
-
-	/**
-	 * Access a Tree by SHA'1 id.
-	 * @param id
-	 * @return Tree or null
-	 * @throws IOException for I/O error or unexpected object type.
-	 * @deprecated Use {@link org.eclipse.jgit.treewalk.TreeWalk#addTree(AnyObjectId)}.
-	 */
-	@Deprecated
-	public Tree mapTree(final ObjectId id) throws IOException {
-		final ObjectLoader or;
-		try {
-			or = open(id);
-		} catch (MissingObjectException notFound) {
-			return null;
-		}
-		final byte[] raw = or.getCachedBytes();
-		switch (or.getType()) {
-		case Constants.OBJ_TREE:
-			return new Tree(this, id, raw);
-
-		case Constants.OBJ_COMMIT:
-			return mapTree(ObjectId.fromString(raw, 5));
-
-		default:
-			throw new IncorrectObjectTypeException(id, Constants.TYPE_TREE);
-		}
-	}
-
 	/**
 	 * Create a command to update, create or delete a ref in this repository.
 	 *