Examples with HashCode com.google.common.hash.HashCode used on opensource projects

Example 96 with HashCode

use of com.google.common.hash.HashCode in project buck by facebook.

the class DefaultFileHashCacheTest method whenJarMemberWithHashInManifestIsQueriedThenCacheCorrectlyObtainsIt.

@Test
public void whenJarMemberWithHashInManifestIsQueriedThenCacheCorrectlyObtainsIt() throws IOException {
    ProjectFilesystem filesystem = new FakeProjectFilesystem();
    DefaultFileHashCache cache = new DefaultFileHashCache(filesystem, Optional.empty());
    Path abiJarPath = Paths.get("test-abi.jar");
    Path memberPath = Paths.get("SomeClass.class");
    String memberContents = "Some contents";
    try (HashingDeterministicJarWriter jar = new HashingDeterministicJarWriter(new JarOutputStream(filesystem.newFileOutputStream(abiJarPath)))) {
        jar.writeEntry(memberPath.toString(), new ByteArrayInputStream(memberContents.getBytes(StandardCharsets.UTF_8)));
    }
    HashCode actual = cache.get(ArchiveMemberPath.of(abiJarPath, memberPath));
    HashCode expected = Hashing.murmur3_128().hashString(memberContents, StandardCharsets.UTF_8);
    assertEquals(expected, actual);
}

Example 97 with HashCode

use of com.google.common.hash.HashCode in project buck by facebook.

the class HashInputJarsToDexStep method execute.

@Override
public StepExecutionResult execute(final ExecutionContext context) {
    ImmutableList.Builder<Path> allInputs = ImmutableList.builder();
    allInputs.addAll(primaryInputsToDex.get());
    if (secondaryOutputToInputs.isPresent()) {
        allInputs.addAll(secondaryOutputToInputs.get().get().values());
    }
    final Map<String, HashCode> classNamesToHashes = classNamesToHashesSupplier.get();
    for (Path path : allInputs.build()) {
        try {
            final Hasher hasher = Hashing.sha1().newHasher();
            new DefaultClasspathTraverser().traverse(new ClasspathTraversal(Collections.singleton(path), filesystem) {

                @Override
                public void visit(FileLike fileLike) throws IOException {
                    String className = fileLike.getRelativePath().replaceAll("\\.class$", "");
                    if (classNamesToHashes.containsKey(className)) {
                        HashCode classHash = Preconditions.checkNotNull(classNamesToHashes.get(className));
                        hasher.putBytes(classHash.asBytes());
                    }
                }
            });
            dexInputsToHashes.put(path, Sha1HashCode.fromHashCode(hasher.hash()));
        } catch (IOException e) {
            context.logError(e, "Error hashing smart dex input: %s", path);
            return StepExecutionResult.ERROR;
        }
    }
    stepFinished = true;
    return StepExecutionResult.SUCCESS;
}

Example 98 with HashCode

use of com.google.common.hash.HashCode in project buck by facebook.

the class DefaultProjectFilesystemDelegate method computeSha1.

@Override
public Sha1HashCode computeSha1(Path pathRelativeToProjectRootOrJustAbsolute) throws IOException {
    final Path fileToHash = getPathForRelativePath(pathRelativeToProjectRootOrJustAbsolute);
    // Normally, we would just use `Files.hash(fileToHash.toFile(), Hashing.sha1())`, but if
    // fileToHash is backed by Jimfs, its toFile() method throws an UnsupportedOperationException.
    // Creating the input stream via java.nio.file.Files.newInputStream() avoids this issue.
    ByteSource source = new ByteSource() {

        @Override
        public InputStream openStream() throws IOException {
            // which already buffers.
            return Files.newInputStream(fileToHash);
        }
    };
    HashCode hashCode = source.hash(Hashing.sha1());
    return Sha1HashCode.fromHashCode(hashCode);
}

Example 99 with HashCode

use of com.google.common.hash.HashCode in project buck by facebook.

the class FilePathHashLoaderTest method doesNotCareAboutFileContents.

@Test
public void doesNotCareAboutFileContents() throws IOException {
    FilePathHashLoader loader = new FilePathHashLoader(cellRoot, ImmutableSet.of());
    HashCode hashBefore = loader.get(file);
    Files.write(file, "Goodbye!".getBytes());
    HashCode hashAfter = loader.get(file);
    assertThat(hashBefore, equalTo(hashAfter));
}

Example 100 with HashCode

use of com.google.common.hash.HashCode in project buck by facebook.

the class FilePathHashLoaderTest method cellRootPathDoesNotInfluenceTheHashes.

@Test
public void cellRootPathDoesNotInfluenceTheHashes() throws IOException {
    FilePathHashLoader baseLoader = new FilePathHashLoader(cellRoot, ImmutableSet.of(fileInDirectory));
    HashCode fileHashCode = baseLoader.get(file);
    HashCode fileInDirectoryHashCode = baseLoader.get(fileInDirectory);
    HashCode directoryHashCode = baseLoader.get(directory);
    Path newCellRoot = vfs.getPath("/different");
    Files.move(cellRoot, newCellRoot);
    file = newCellRoot.resolve("a.txt");
    directory = newCellRoot.resolve("dir");
    fileInDirectory = directory.resolve("a.txt");
    FilePathHashLoader newLoader = new FilePathHashLoader(newCellRoot, ImmutableSet.of(fileInDirectory));
    assertThat(newLoader.get(file), equalTo(fileHashCode));
    assertThat(newLoader.get(fileInDirectory), equalTo(fileInDirectoryHashCode));
    assertThat(newLoader.get(directory), equalTo(directoryHashCode));
}