appendCollectionToHasherKeepingOrder(hasher, sortedFingerprints);
        }
    },
    KEEP_ORDER {
        @Override
        public void appendToHasher(Hasher hasher, Collection<FileSystemLocationFingerprint> fingerprints) {
            appendCollectionToHasherKeepingOrder(hasher, fingerprints);
        }
    };

    public abstract void appendToHasher(Hasher hasher, Collection<FileSystemLocationFingerprint> fingerprints);

        Hasher hasher = Hashing.newHasher();
        addToHash(hasher, spec.getClassNames());
        addToHash(hasher, spec.getPackageNames());
        addToHash(hasher, spec.getPackagePrefixes());
        addToHash(hasher, spec.getResourcePrefixes());
        addToHash(hasher, spec.getResourceNames());
        addToHash(hasher, spec.getDisallowedClassNames());

        HashCode dependenciesHash
    ) {
        Hasher hasher = Hashing.newHasher();
        hasher.putString(normalizedInputArtifactPath);
        hasher.putString(producerBuildTreePath);
        hasher.put(secondaryInputsSnapshot);
        hasher.putHash(dependenciesHash);
        return new TransformWorkspaceIdentity(secondaryInputsSnapshot, hasher.hash());
    }

            hasher.putInt(bytes.length);
            hasher.putBytes(bytes);
        }

        @Override
        public void putBytes(byte[] bytes, int off, int len) {
            hasher.putInt(len);
            hasher.putBytes(bytes, off, len);
        }

        @Override
        public void putHash(HashCode hashCode) {
            hasher.putInt(hashCode.length());
            hasher.putHash(hashCode);

        0 * delegate.hash(_)

        and:
        hash == null
    }

    def "delegate configuration is added to hasher"() {
        def configurationHasher = Mock(Hasher)

        when:
        hasher.appendConfigurationToHasher(configurationHasher)

        then:
        1 * delegate.appendConfigurationToHasher(configurationHasher)
    }

        transform.applyConfigurationTo(hasher);
        return hasher.hash();
    }

    private static ClasspathFileHasher createFileHasherWithConfig(HashCode configHash, ClasspathFileHasher fileHasher) {
        return sourceSnapshot -> {
            Hasher hasher = Hashing.newHasher();
            hasher.putHash(configHash);
            hasher.putHash(fileHasher.hashOf(sourceSnapshot));

        when:
        hasher.hash(zipEntry('META-INF/foo'))
        hasher.hash(zipEntry('META-INF/foo/MANIFEST.MF'))
        hasher.hash(zipEntry('META-INF/properties'))
        hasher.hash(zipEntry('META-INF/build.propertiesX'))
        hasher.hash(zipEntry('bar.properties'))
        hasher.hash(zipEntry('resources/foo.properties'))
        hasher.hash(zipEntry('foo'))
        hasher.hash(zipEntry('org/gradle/foo.class'))

  private final ByteBuffer scratch = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);

  /** Updates this hasher with the given byte. */
  protected abstract void update(byte b);

  /** Updates this hasher with the given bytes. */
  protected void update(byte[] b) {
    update(b, 0, b.length);
  }

  /** Updates this hasher with {@code len} bytes starting at {@code off} in the given buffer. */

        def file = file('foo') << contents
        def delegate = Mock(ResourceHasher)
        def hasher = LineEndingNormalizingResourceHasher.wrap(delegate, LineEndingSensitivity.NORMALIZE_LINE_ENDINGS)

        when:
        hasher.hash(snapshotContext(file))

        then:
        0 * delegate._

        when:
        hasher.hash(zipContext(file))

        then:
        0 * delegate._

        where:

        def hasher = Hashing.newHasher()
        strings.each { hasher.putString(it) }
        hasher.hash()
    }

    def hashKey(List<List<Integer>> bytes) {
        def hasher = Hashing.newHasher()
        bytes.each {
            if (it.size() == 1) {
                hasher.putByte(it[0] as byte)
            } else {
                hasher.putBytes(it as byte[])
            }