Example usage for com.google.common.base Preconditions checkArgument

Introduction

In this page you can find the example usage for com.google.common.base Preconditions checkArgument.

Prototype

public static void checkArgument(boolean expression, @Nullable Object errorMessage)

Source Link

Document

Ensures the truth of an expression involving one or more parameters to the calling method.

Usage

From source file:com.palantir.atlasdb.keyvalue.api.TableReference.java

public static TableReference createFromFullyQualifiedName(String fullTableName) {
    int index = fullTableName.indexOf('.');
    Preconditions.checkArgument(index > 0, "Table name %s is not a fully qualified table name.");
    return create(Namespace.create(fullTableName.substring(0, index), Namespace.UNCHECKED_NAME),
            fullTableName.substring(index + 1));
}

From source file:com.facebook.stats.cardinality.HyperLogLogUtil.java

public static long estimateCardinality(int[] bucketValues) {
    Preconditions.checkArgument(Numbers.isPowerOf2(bucketValues.length),
            "number of buckets must be a power of 2");

    int zeroBuckets = 0;
    double sum = 0;
    for (Integer value : bucketValues) {
        sum += 1.0 / (1L << value);
        if (value == 0) {
            ++zeroBuckets;/*from  w w  w.ja  v  a2  s.co m*/
        }
    }

    double alpha = computeAlpha(bucketValues.length);
    double result = alpha * bucketValues.length * bucketValues.length / sum;

    if (result <= 2.5 * bucketValues.length) {
        // adjust for small cardinalities
        if (zeroBuckets > 0) {
            // baselineCount is the number of buckets with value 0
            result = bucketValues.length * Math.log(bucketValues.length * 1.0 / zeroBuckets);
        }
    }

    return Math.round(result);
}

From source file:org.bozzo.ipplan.tools.Netmask.java

/**
 * Return the netmask from the number of hosts
 * @param number the number of hosts//  w w  w . j av a 2  s .  co m
 * @return the netmask
 */
public static Integer fromNumberHosts(Long number) {
    Preconditions.checkArgument(number != null, "Hosts number shouldn't be null");
    Preconditions.checkArgument(number > 0, "Hosts number should be a positive integer");
    if (number >= (1L << 32)) {
        return 0;
    } else if (number >= (1L << 31)) {
        return 1;
    }
    return 1 + Integer.numberOfLeadingZeros(number.intValue());
}

From source file:com.spotify.helios.client.ClientCertificatePath.java

private static Path checkExists(Path path) {
    Preconditions.checkNotNull(path);/*from   w w w  . j a va  2s  .com*/
    Preconditions.checkArgument(path.toFile().canRead(), path + " does not exist or cannot be read");
    return path;
}

From source file:org.opendaylight.genius.itm.cli.ItmCliUtils.java

/**
 * Construct dpn id list./*from   w  w w.  ja v  a  2s . c o  m*/
 *
 * @param dpnIds
 *            the dpn ids
 * @return the list
 */
public static List<BigInteger> constructDpnIdList(final String dpnIds) {
    final List<BigInteger> lstDpnIds = new ArrayList<>();
    if (StringUtils.isNotBlank(dpnIds)) {
        final String[] arrDpnIds = StringUtils.split(dpnIds, ',');
        for (String dpn : arrDpnIds) {
            if (StringUtils.isNumeric(StringUtils.trim(dpn))) {
                lstDpnIds.add(new BigInteger(StringUtils.trim(dpn)));
            } else {
                Preconditions.checkArgument(false, String.format("DPN ID [%s] is not a numeric value.", dpn));
            }
        }
    }
    return lstDpnIds;
}

From source file:minium.internal.Paths.java

public static URL toURL(String urlPath) {
    Preconditions.checkArgument(!urlPath.startsWith(CLASSPATH_WILDCARD_PROTOCOL),
            "path starts with classpath*, use toURLs instead");
    return Iterables.getFirst(toURLs(urlPath), null);
}

From source file:org.janusgraph.graphdb.configuration.validator.CompatibilityValidator.java

public static void validateBackwardCompatibilityWithTitan(String version,
        String localConfigurationIdsStoreName) {

    Preconditions.checkArgument(version != null,
            "JanusGraph version nor Titan compatibility have not been initialized");

    if (!JanusGraphConstants.TITAN_COMPATIBLE_VERSIONS.contains(version)) {
        throw new JanusGraphException(
                String.format(INCOMPATIBLE_VERSION_EXCEPTION, version, JanusGraphConstants.VERSION));
    }//ww  w.  j  av a 2s.c om

    // When connecting to a store created by Titan the ID store name will not be in the
    // global configuration as it was not something which was configurable with Titan.
    // So to ensure compatibility override the default to titan_ids.
    boolean localIdStoreIsDefault = JanusGraphConstants.JANUSGRAPH_ID_STORE_NAME
            .equals(localConfigurationIdsStoreName);

    boolean usingTitanIdStore = localIdStoreIsDefault
            || JanusGraphConstants.TITAN_ID_STORE_NAME.equals(localConfigurationIdsStoreName);

    Preconditions.checkArgument(usingTitanIdStore,
            "ID store for Titan compatibility has not been initialized to: "
                    + JanusGraphConstants.TITAN_ID_STORE_NAME);
}

From source file:com.google.cloud.hadoop.gcsio.GoogleCloudStorageExceptions.java

/**
 * Creates FileNotFoundException with suitable message for a GCS bucket or object.
 *///www .j  a  v  a  2s .  c o  m
public static FileNotFoundException getFileNotFoundException(String bucketName, String objectName) {
    Preconditions.checkArgument(!Strings.isNullOrEmpty(bucketName), "bucketName must not be null or empty");
    if (objectName == null) {
        objectName = "";
    }
    return new FileNotFoundException(String.format("Item not found: %s/%s", bucketName, objectName));
}

From source file:org.haiku.haikudepotserver.support.URLHelper.java

public static long payloadLength(URL url) throws IOException {
    Preconditions.checkArgument(null != url, "the url must be supplied");

    long result = -1;
    HttpURLConnection connection = null;

    switch (url.getProtocol()) {

    case "http":
    case "https":

        try {//from www  .j a v  a2  s  . c  o m
            connection = (HttpURLConnection) url.openConnection();

            connection.setConnectTimeout(PAYLOAD_LENGTH_CONNECT_TIMEOUT);
            connection.setReadTimeout(PAYLOAD_LENGTH_READ_TIMEOUT);
            connection.setRequestMethod(HttpMethod.HEAD.name());
            connection.connect();

            String contentLengthHeader = connection.getHeaderField(HttpHeaders.CONTENT_LENGTH);

            if (!Strings.isNullOrEmpty(contentLengthHeader)) {
                long contentLength;

                try {
                    contentLength = Long.parseLong(contentLengthHeader);

                    if (contentLength > 0) {
                        result = contentLength;
                    } else {
                        LOGGER.warn("bad content length; {}", contentLength);
                    }
                } catch (NumberFormatException nfe) {
                    LOGGER.warn("malformed content length; {}", contentLengthHeader);
                }
            } else {
                LOGGER.warn("unable to get the content length header");
            }

        } finally {
            if (null != connection) {
                connection.disconnect();
            }
        }
        break;

    case "file":
        File file = new File(url.getPath());

        if (file.exists() && file.isFile()) {
            result = file.length();
        } else {
            LOGGER.warn("unable to find the local file; {}", url.getPath());
        }
        break;

    }

    LOGGER.info("did obtain length for url; {} - {}", url, result);

    return result;
}

From source file:com.facebook.presto.sql.planner.DomainUtils.java

public static <T> Map<Symbol, T> columnHandleToSymbol(Map<ColumnHandle, T> columnMap,
        Map<Symbol, ColumnHandle> assignments) {
    Map<ColumnHandle, Symbol> inverseAssignments = ImmutableBiMap.copyOf(assignments).inverse();
    Preconditions.checkArgument(inverseAssignments.keySet().containsAll(columnMap.keySet()),
            "assignments does not contain all required column handles");
    ImmutableMap.Builder<Symbol, T> builder = ImmutableMap.builder();
    for (Map.Entry<ColumnHandle, T> entry : columnMap.entrySet()) {
        builder.put(inverseAssignments.get(entry.getKey()), entry.getValue());
    }// www  .  j a  va 2 s  .c  om
    return builder.build();
}