@Nullable
            @Override
            public <S> S coerce(Class<S> type) {
                throw new UnsupportedOperationException();
            }

            @Override
            public void appendToHasher(Hasher hasher) {
                hasher.putString(String.valueOf(value));
            }
        };
    }

                // Same serialized content - value has not changed
                return true;
            }
        }
        return false;
    }

    @Override
    public void appendToHasher(Hasher hasher) {
        if (implementationHash == null) {
            hasher.putNull();
        } else {
            hasher.putHash(implementationHash);
        }
        hasher.putBytes(serializedValue);
    }

        ValueSnapshot snapshot = snapshotter.snapshot(value);
        if (equals(snapshot)) {
            return this;
        }
        return snapshot;
    }

    @Override
    public void appendToHasher(Hasher hasher) {
        if (implementationHash == null) {
            hasher.putNull();
        } else {
            hasher.putHash(implementationHash);
        }
        hasher.putBytes(serializedValue);
    }

            return enumValue.name().equals(name) && enumValue.getDeclaringClass().getName().equals(className);
        }
        return false;
    }

    @Override
    public void appendToHasher(Hasher hasher) {
        hasher.putString(className);
        hasher.putString(name);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;

        this.rootHashes = rootHashes;
    }

    @Override
    public HashCode getHash() {
        if (hash == null) {
            Hasher hasher = Hashing.newHasher();
            hashingStrategy.appendToHasher(hasher, fingerprints.values());
            hash = hasher.hash();
        }
        return hash;
    }

    @Override
    public boolean isEmpty() {

            return -1;
        }
        return normalizedContentHash.compareTo(o.getNormalizedContentHash());
    }

    @Override
    public void appendToHasher(Hasher hasher) {
        hasher.putHash(normalizedContentHash);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

                return hash;
            default:
                throw new IllegalStateException("Unknown file type: " + fileType);
        }
    }

    @Override
    public final void appendToHasher(Hasher hasher) {
        hasher.putString(getNormalizedPath());
        hasher.putHash(getNormalizedContentHash());
    }

    @Override
    public FileType getType() {

    public UnknownImplementationSnapshot(String typeName, UnknownReason unknownReason) {
        super(typeName);
        this.unknownReason = unknownReason;
    }

    @Override
    public void appendToHasher(Hasher hasher) {
        throw new UnsupportedOperationException("Cannot hash an unknown implementation " + this);
    }

    @Override
    protected boolean isSameSnapshot(@Nullable Object o) {

    }

    def "cannot hash unknown implementation snapshot"() {
        def snapshot = ImplementationSnapshot.of("SomeClass", null)
        when:
        snapshot.appendToHasher(Mock(Hasher))

        then:
        thrown(UnsupportedOperationException)
        0 * _
    }

    def "implementation snapshots are equal for classes created #description"() {
        expect:

        this.implMethodName = implMethodName;
        this.implMethodSignature = implMethodSignature;
        this.implMethodKind = implMethodKind;
    }

    @Override
    public void appendToHasher(Hasher hasher) {
        hasher.putString(LambdaImplementationSnapshot.class.getName());
        hasher.putString(classIdentifier);
        hasher.putHash(classLoaderHash);
        hasher.putString(functionalInterfaceClass);