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 String errorMessageTemplate,
        @Nullable Object... errorMessageArgs)

Source Link

Document

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

Usage

From source file:org.apache.curator.test.DirectoryUtils.java

public static void deleteDirectoryContents(File directory) throws IOException {
    Preconditions.checkArgument(directory.isDirectory(), "Not a directory: %s", directory);
    File[] files = directory.listFiles();
    if (files == null) {
        throw new IOException("Error listing files for " + directory);
    }/*  ww  w. j  a  v  a  2 s  . co  m*/
    for (File file : files) {
        deleteRecursively(file);
    }
}

From source file:org.opendaylight.protocol.pcep.impl.tls.SslKeyStore.java

/**
 * InputStream instance of key - key location is on classpath or specific path
 *
 * @param filename/*from  w ww  .  j av a  2 s  .  c  o m*/
 *          keystore location
 * @param pathType
 *          keystore location type - "classpath" or "path"
 *
 * @return key as InputStream
 */
public static InputStream asInputStream(final String filename, final PathType pathType) {
    InputStream in;
    switch (pathType) {
    case CLASSPATH:
        in = SslKeyStore.class.getResourceAsStream(filename);
        Preconditions.checkArgument(in != null, "KeyStore file not found: %s", filename);
        break;
    case PATH:
        LOG.debug("Current dir using System: {}", System.getProperty("user.dir"));
        final File keystorefile = new File(filename);
        try {
            in = new FileInputStream(keystorefile);
        } catch (final FileNotFoundException e) {
            throw new IllegalStateException("KeyStore file not found: " + filename, e);
        }
        break;
    default:
        throw new IllegalArgumentException("Unknown path type: " + pathType);
    }
    return in;
}

From source file:net.myrrix.common.LangUtils.java

/**
 * Parses a {@code float} from a {@link String} as if by {@link Float#valueOf(String)}, but disallows special
 * values like {@link Float#NaN}, {@link Float#POSITIVE_INFINITY} and {@link Float#NEGATIVE_INFINITY}.
 *
 * @param s {@link String} to parse//from ww  w  .  j a v  a2  s. c  om
 * @return floating-point value in the {@link String}
 * @throws NumberFormatException if input does not parse as a floating-point value
 * @throws IllegalArgumentException if input is infinite or {@link Float#NaN}
 * @see #parseDouble(String)
 */
public static float parseFloat(String s) {
    float value = Float.parseFloat(s);
    Preconditions.checkArgument(isFinite(value), "Bad value: %s", value);
    return value;
}

From source file:com.cloudera.oryx.common.LangUtils.java

/**
 * Parses a {@code float} from a {@link String} as if by {@link Float#valueOf(String)}, but disallows special
 * values like {@link Float#NaN}, {@link Float#POSITIVE_INFINITY} and {@link Float#NEGATIVE_INFINITY}.
 *
 * @param s {@link String} to parse/*from  www  .jav a 2s .  com*/
 * @return floating-point value in the {@link String}
 * @throws NumberFormatException if input does not parse as a floating-point value
 * @throws IllegalArgumentException if input is infinite or {@link Float#NaN}
 * @see #parseDouble(String)
 */
public static float parseFloat(String s) {
    float value = Float.parseFloat(s);
    Preconditions.checkArgument(Floats.isFinite(value), "Bad value: %s", value);
    return value;
}

From source file:org.asoem.greyfish.utils.math.ApproximationMath.java

/**
 * Gaussian function using {@link #exp}/*w  ww .ja va  2s .  co  m*/
 *
 * @param x x
 * @param norm the normalization factor
 * @param mean the mean
 * @param sigma the standard deviation
 * @return norm * e ^ -((x - mean)^2 / 2 * sigma^2)
 */
public static double gaussian(final double x, final double norm, final double mean, final double sigma) {
    Preconditions.checkArgument(sigma > 0, "Sigma must be strictly positive, but was %s", sigma);
    return gaussianHelper(x - mean, norm, i2s2(sigma));
}

From source file:org.gradle.caching.internal.CompositeBuildCacheService.java

public static BuildCacheService create(@Nullable BuildCacheService pushToCache,
        List<BuildCacheService> pullFromCaches) {
    if (pushToCache != null) {
        Preconditions.checkArgument(pullFromCaches.contains(pushToCache),
                "pushToCache %s must be contained in pullFromCaches", pushToCache.getDescription());
    }//  w w w .  j a  v a 2  s. c o m
    if (pullFromCaches.size() == 1) {
        return CollectionUtils.single(pullFromCaches);
    }
    return new CompositeBuildCacheService(pushToCache, pullFromCaches);
}

From source file:org.opendaylight.controller.cluster.datastore.node.utils.stream.PathArgumentTypes.java

public static byte getSerializablePathArgumentType(YangInstanceIdentifier.PathArgument pathArgument) {
    final Byte type = CLASS_TO_ENUM_MAP.get(pathArgument.getClass());
    Preconditions.checkArgument(type != null, "Unknown type of PathArgument = %s", pathArgument);
    return type;//from  ww w . j  av  a2  s .  co  m
}

From source file:com.atoito.please.core.util.Environment.java

public static void initializeWithHome(File home) {
    // M.info("=========  initializeWithHome '%s'", home.getAbsolutePath());
    if (current != null) {
        throw new PleaseException("environment already initialized");
    }//from   www. j a v a 2  s.c  o m
    File cleanHome = Preconditions.checkNotNull(home, "home directory cannot be null");
    Preconditions.checkArgument(cleanHome.exists(), "home '%s' not found", cleanHome.getAbsolutePath());
    Preconditions.checkArgument(cleanHome.isDirectory(), "home '%s' is not a directory",
            cleanHome.getAbsolutePath());
    current = new Environment(cleanHome);
}