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.aerofs.baseline.http.HttpUtils.java

public static String readResponseEntityToString(HttpResponse response) throws IOException {
    Preconditions.checkArgument(response.getEntity().getContentLength() > 0,
            "entity must have non-zero content length");
    return readStreamToString(response.getEntity().getContent());
}

From source file:org.haiku.haikudepotserver.dataobjects.PkgScreenshot.java

public static Optional<PkgScreenshot> tryGetByCode(ObjectContext context, String code) {
    Preconditions.checkArgument(null != context, "the context must be supplied");
    Preconditions.checkArgument(!Strings.isNullOrEmpty(code), "the code must be supplied");
    return Optional.ofNullable(ObjectSelect.query(PkgScreenshot.class).where(CODE.eq(code)).selectOne(context));
}

From source file:com.metamx.common.RetryUtils.java

public static <T> T retry(final Callable<T> f, Predicate<Throwable> shouldRetry, final int maxTries)
        throws Exception {
    Preconditions.checkArgument(maxTries > 0, "maxTries > 0");
    int nTry = 0;
    while (true) {
        try {//  w  w  w. j a  v a2 s  .  c  o  m
            nTry++;
            return f.call();
        } catch (Throwable e) {
            if (nTry < maxTries && shouldRetry.apply(e)) {
                awaitNextRetry(e, nTry);
            } else {
                Throwables.propagateIfInstanceOf(e, Exception.class);
                throw Throwables.propagate(e);
            }
        }
    }
}

From source file:org.apache.mahout.classifier.df.ErrorEstimate.java

public static double errorRate(double[] labels, double[] predictions) {
    Preconditions.checkArgument(labels.length == predictions.length, "labels.length != predictions.length");
    double nberrors = 0; // number of instance that got bad predictions
    double datasize = 0; // number of classified instances

    for (int index = 0; index < labels.length; index++) {
        if (predictions[index] == -1) {
            continue; // instance not classified
        }/*from  ww w. j a  va 2s . co  m*/

        if (predictions[index] != labels[index]) {
            nberrors++;
        }

        datasize++;
    }

    return nberrors / datasize;
}

From source file:com.android.builder.internal.packaging.zip.AlignmentRules.java

/**
 * A rule that defines a constant alignment for all files.
 *
 * @param alignment the alignment/*from   ww w  . ja  va  2  s .co  m*/
 * @return the rule
 */
public static AlignmentRule constant(int alignment) {
    Preconditions.checkArgument(alignment > 0, "alignment <= 0");

    return (String path) -> alignment;
}

From source file:com.digitalpetri.opcua.stack.core.util.ArrayUtil.java

/**
 * Flatten a multi-dimensional array into a one-dimensional array.
 *
 * @param array the array to flatten.//  w  ww . j  a v  a2 s  .co  m
 * @return a 1-dimensional array.
 */
public static Object flatten(Object array) {
    Preconditions.checkArgument(array.getClass().isArray(), "array");

    Class<?> type = getType(array);
    int[] dimensions = getDimensions(array);
    int length = length(dimensions);

    Object flattened = Array.newInstance(type, length);

    flatten(array, flattened, dimensions, 0);

    return flattened;
}

From source file:com.palantir.lock.LockCollections.java

public static <T extends Comparable<T>> SortedLockCollection<T> of(SortedMap<T, LockMode> locks) {
    Preconditions.checkArgument(locks.comparator() == null || locks.comparator() == Ordering.natural(),
            "sorted lock collections must use naturally comparable keys");
    return new SortedLockCollection<T>(locks.entrySet());
}

From source file:it.ItEnvironment.java

public static Map<String, Object> getConfiguration() {
    final ObjectMapper mapper = new ObjectMapper();
    final Map<String, Object> configuration;
    final File src = new File("it.json");

    Preconditions.checkArgument(src.exists(), "it.json doesn't exist in the working directory!");
    try {//from  w  w  w .java  2 s .c  o m
        configuration = mapper.readValue(src, new TypeReference<Map<String, Object>>() {
        });
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
    return configuration;
}

From source file:org.apache.mahout.df.ErrorEstimate.java

public static double errorRate(int[] labels, int[] predictions) {
    Preconditions.checkArgument(labels.length == predictions.length, "labels.length != predictions.length");
    double nberrors = 0; // number of instance that got bad predictions
    double datasize = 0; // number of classified instances

    for (int index = 0; index < labels.length; index++) {
        if (predictions[index] == -1) {
            continue; // instance not classified
        }/* www .ja  va2  s  .  c  o  m*/

        if (predictions[index] != labels[index]) {
            nberrors++;
        }

        datasize++;
    }

    return nberrors / datasize;
}

From source file:rus.cpuinfo.Util.ConverterUtil.java

public static int convertFromKHzToMHz(final int KHz) {

    Preconditions.checkArgument(KHz > 0, "KHz must be greater than zero");
    return KHz / 1000;
}