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.github.fommil.ff.Direction.java

/**
 * @param angle {@code [-PI, PI]} with 0 being NORTH.
 * @return/*from  www  .  jav a2s  . c o  m*/
 */
public static Direction valueOf(double angle) {
    if (Double.isNaN(angle))
        return null;
    Preconditions.checkArgument(angle <= Math.PI && angle >= -Math.PI, angle);
    angle = angle - Math.PI / 8; // tolerance
    if (angle <= -Math.PI) {
        return SOUTH;
    } else if (angle <= -3 * Math.PI / 4) {
        return SOUTH_WEST;
    } else if (angle <= -Math.PI / 2) {
        return WEST;
    } else if (angle <= -Math.PI / 4) {
        return NORTH_WEST;
    } else if (angle <= 0) {
        return NORTH;
    } else if (angle <= Math.PI / 4) {
        return NORTH_EAST;
    } else if (angle <= Math.PI / 2) {
        return EAST;
    } else if (angle <= 3 * Math.PI / 4) {
        return SOUTH_EAST;
    } else {
        return SOUTH;
    }
}

From source file:com.github.hilcode.versionator.misc.Either.java

public static final <T, L, R> Either<L, R> asRight(final Either<T, R> either) {
    Preconditions.checkArgument(either.isRight(), "Invalid cast, this Either represents a Left.");
    @SuppressWarnings("unchecked")
    final Either<L, R> either_ = (Either<L, R>) either;
    return either_;
}

From source file:de.jackwhite20.cobra.client.CobraClientFactory.java

public static CobraClient create(String baseUrl) {

    Preconditions.checkArgument(baseUrl != null, "baseUrl cannot be null");
    Preconditions.checkArgument(!baseUrl.isEmpty(), "baseUrl cannot be empty");

    return new CobraClientImpl(baseUrl);
}

From source file:com.cloudera.nav.sdk.model.HiveIdGenerator.java

public static String generateColumnId(String sourceId, String databaseName, String tableName,
        String columnName) {// ww  w  .  j a  v  a 2  s.  co  m
    Preconditions.checkArgument(
            !StringUtils.isEmpty(sourceId) && !StringUtils.isEmpty(databaseName)
                    && !StringUtils.isEmpty(tableName) && !StringUtils.isEmpty(columnName),
            "SourceId, database name, table name, and column name must be "
                    + "supplied to generate Hive column identity");
    return MD5IdGenerator.generateIdentity(sourceId, databaseName.toUpperCase(), tableName.toUpperCase(),
            columnName.toUpperCase());
}

From source file:com.github.hilcode.versionator.Result.java

public static final <ANY, F, S> Result<F, S> asFailure(final Result<F, ANY> result) {
    Preconditions.checkArgument(result.isFailure(), "Invalid cast, this Result represents a Success.");
    @SuppressWarnings("unchecked")
    final Result<F, S> result_ = (Result<F, S>) result;
    return result_;
}

From source file:org.terasology.cities.noise.Wave.java

/**
 * Creates a function that looks like this:
 * <pre>//w  w  w . j  a v  a 2  s  . co m
 *   /\    /\
 *  /  \  /  \
 * /    \/    \
 * </pre>
 * @param waveLength the width of one hat
 * @param multipliers the heights of the hats
 * @return an univariate function
 */
public static Wave getHat(final double waveLength, final double[] multipliers) {

    return new Wave() {

        public double get(double v) {
            Preconditions.checkArgument(v >= 0 && v <= 1, "Value must be in range [0..1]");

            double hpos = getWaveletPos(waveLength, v);
            int suppIdx = getIndex(v, waveLength);

            return multipliers[suppIdx] * hpos;
        }
    };
}

From source file:org.kitesdk.data.spi.predicates.RegisteredPredicate.java

public static void register(String name, Factory factory) {
    Preconditions.checkArgument(NAME.matcher(name).matches(),
            "Invalid name, must be alphanumeric (plus _): " + name);
    REGISTRY.put(name, factory);/* www . j a  v a  2s.co m*/
}

From source file:org.adridadou.ethereum.values.EthAddress.java

private EthAddress(byte[] address) {
    Preconditions.checkArgument(address.length <= 32,
            "byte array of the address cannot be bigger than 32.value:" + Hex.toHexString(address));
    this.address = address;
}

From source file:ch.ge.ve.commons.crypto.utils.SaltUtils.java

/**
 * Generates a salt using Java SecureRandom
 *
 * @param lengthInBits desired length of the salt
 * @return the salt//from   www.j a  va2  s .  c  o m
 */
public static byte[] generateSalt(int lengthInBits) {
    Preconditions.checkArgument(lengthInBits % 8 == 0,
            String.format("The salt length must be a multiple of 8, but was %d!", lengthInBits));
    byte[] salt = new byte[lengthInBits / 8];
    SECURE_RANDOM.nextBytes(salt);
    return salt;
}

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

public static Optional<PkgVersionLocalization> getForPkgVersionAndNaturalLanguageCode(ObjectContext context,
        PkgVersion pkgVersion, final String naturalLanguageCode) {

    Preconditions.checkArgument(null != context, "the context must be supplied");
    Preconditions.checkArgument(null != pkgVersion, "the pkg version must be supplied");
    Preconditions.checkArgument(!Strings.isNullOrEmpty(naturalLanguageCode),
            "the natural language code is required");
    return getForPkgVersion(context, pkgVersion).stream()
            .filter(pvl -> pvl.getNaturalLanguage().getCode().equals(naturalLanguageCode))
            .collect(SingleCollector.optional());
}