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

Example 86 with Hasher

use of com.google.common.hash.Hasher in project gitiles by GerritCodeReview.

the class Renderer method computeTemplateHash.

HashCode computeTemplateHash(String soyFile) {
    URL u = templates.get(soyFile);
    checkState(u != null, "Missing Soy template %s", soyFile);
    Hasher h = Hashing.murmur3_128().newHasher();
    try (InputStream is = u.openStream();
        OutputStream os = Funnels.asOutputStream(h)) {
        ByteStreams.copy(is, os);
    } catch (IOException e) {
        throw new IllegalStateException("Missing Soy template " + soyFile, e);
    }
    return h.hash();
}

Example 87 with Hasher

use of com.google.common.hash.Hasher in project dsl-devkit by dsldevkit.

the class DefaultInferredElementFragmentProvider method computeHash.

/**
 * Computes a hash code for the given {@link #getEClass(EObject) EClass} and {@link #getQualifiedName(EObject) qualified name}.
 *
 * @param eClass
 *          EClass to base hash on, must not be {@code null}
 * @param name
 *          qualified name of inferred model element, can be {@code null}
 * @return hash code, never {@code null}
 */
protected HashCode computeHash(final EClass eClass, final QualifiedName name) {
    byte[] eClassUriBytes = eClassToUriBytesMap.get(eClass);
    if (eClassUriBytes == null) {
        eClassUriBytes = EcoreUtil.getURI(eClass).toString().getBytes(Charsets.UTF_8);
        eClassToUriBytesMap.put(eClass, eClassUriBytes);
    }
    Hasher hasher = hashFunction.newHasher(HASHER_CAPACITY);
    hasher.putBytes(eClassUriBytes);
    if (name != null) {
        hasher.putChar('/');
        for (int j = 0; j < name.getSegmentCount(); j++) {
            hasher.putUnencodedChars(name.getSegment(j)).putChar('.');
        }
    }
    return hasher.hash();
}

Example 88 with Hasher

use of com.google.common.hash.Hasher in project dsl-devkit by dsldevkit.

the class AbstractStreamingFingerprintComputer method computeFingerprint.

/**
 * Computes a fingerprint for a collection of {@link EObject}.
 * <p>
 * The collection of eobjects to fingerprint is specified by an {@link Iterable}. When determining how to compute the fingerprint the first item of the
 * Iterable supplies the context for all eobjects in the collection. The collection is fingerprinted as {@link #FingerprintOrder}.{@link #UNORDERED} and each
 * eobject in the collection is fingerprinted as {@link #FingerprintIndirection}.{@link #INDIRECT}.
 * </p>
 *
 * @see #fingerprintIndirection(EObject, EObject, EReference, Hasher)
 * @see #fingerprintIterable(Iterable, EObject, FingerprintOrder, FingerprintIndirection, Hasher)
 * @param objects
 *          an {@link Iterable} that specifies the collection of {@link EObject}s to be fingerprinted, may be {@code null}
 * @return the fingerprint for the collection of {@code objects} or {@code null} if {@code objects} is {@code null} or empty.
 */
protected String computeFingerprint(final Iterable<? extends EObject> objects) {
    if (objects == null || Iterables.isEmpty(objects)) {
        return null;
    }
    Hasher hasher = HASH_FUNCTION.newHasher();
    fingerprintIterable(objects, Iterables.get(objects, 0), FingerprintOrder.UNORDERED, FingerprintIndirection.INDIRECT, hasher);
    return hasher.hash().toString();
}

Example 89 with Hasher

use of com.google.common.hash.Hasher in project dsl-devkit by dsldevkit.

the class AbstractStreamingFingerprintComputer method computeFingerprint.

/**
 * {@inheritDoc}
 */
@Override
public String computeFingerprint(final EObject object) {
    if (object == null) {
        return null;
    }
    Hasher hasher = HASH_FUNCTION.newHasher();
    fingerprint(object, hasher);
    HashCode export = hasher.hash();
    if (export.equals(NO_EXPORT)) {
        return null;
    }
    return export.toString();
}

Example 90 with Hasher

use of com.google.common.hash.Hasher in project OpenTripPlanner by opentripplanner.

the class StopPattern method semanticHash.

/**
 * In most cases we want to use identity equality for StopPatterns. There is a single StopPattern instance for each
 * semantic StopPattern, and we don't want to calculate complicated hashes or equality values during normal
 * execution. However, in some cases we want a way to consistently identify trips across versions of a GTFS feed, when the
 * feed publisher cannot ensure stable trip IDs. Therefore we define some additional hash functions.
 */
public HashCode semanticHash(HashFunction hashFunction) {
    Hasher hasher = hashFunction.newHasher();
    for (int s = 0; s < size; s++) {
        Stop stop = stops[s];
        // Truncate the lat and lon to 6 decimal places in case they move slightly between feed versions
        hasher.putLong((long) (stop.getLat() * 1000000));
        hasher.putLong((long) (stop.getLon() * 1000000));
    }
    // and have changed between OTP versions.
    for (int hop = 0; hop < size - 1; hop++) {
        hasher.putInt(pickups[hop]);
        hasher.putInt(dropoffs[hop + 1]);
    }
    return hasher.hash();
}