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

Introduction

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

Prototype

public static <T> T checkNotNull(T reference)

Source Link

Document

Ensures that an object reference passed as a parameter to the calling method is not null.

Usage

From source file:com.bennavetta.aeneas.zookeeper.Servers.java

/**
 * Generates suitable ZooKeeper configuration from a collection of server instances. The produced map is the parsed
 * equivalent of the {@code server.N} properties in ZooKeeper's dynamic configuration file.
 * @param servers the servers to include
 * @return a configuration chunk as a map
 *///  w  w  w  .java2s. c  o  m
public static Map<String, String> toServerSpecification(ZkServer... servers) {
    Preconditions.checkNotNull(servers);
    return Arrays.stream(servers)
            .collect(Collectors.toMap(s -> "server." + s.getId(), ZkServer::toConnectionSpec));
}

From source file:com.github.mike10004.jenkinsbbhook.ServletInitParamValueProvider.java

public ServletInitParamValueProvider(ServletContext servletContext) {
    this.servletContext = Preconditions.checkNotNull(servletContext);
}

From source file:com.davidbracewell.ml.classification.Classification.java

/**
 * Calculates the log likelihood of  the model give a set of data.
 *
 * @param model The model// ww  w. j a  va2s. c  om
 * @param data  The data
 * @return The log likelihood
 */
public static double logLikelihood(ClassificationModel model, List<Instance> data) {
    Preconditions.checkNotNull(model);
    Preconditions.checkNotNull(data);
    double ll = 0;
    for (Instance inst : data) {
        if (inst.hasTargetValue()) {
            ll += Math.log(model.estimate(inst).getConfidence(inst.getTargetValue()));
        }
    }
    return ll;
}

From source file:org.apache.shindig.common.util.HashUtil.java

/**
 * Produces a checksum for the given input data. Currently uses a hexified
 * message digest.//from   www.  j  a va2s.  c o m
 *
 * @param data
 * @return The checksum.
 */
public static String checksum(byte[] data) {
    byte[] hashBytes = getMessageDigest().digest(Preconditions.checkNotNull(data));
    char[] hex = new char[2 * hashBytes.length];

    // Convert to hex. possibly change to base64 in the future for smaller
    // signatures.

    int offset = 0;
    for (byte b : hashBytes) {
        hex[offset++] = HEX_CHARS[(b & 0xF0) >>> 4]; // upper 4 bits
        hex[offset++] = HEX_CHARS[(b & 0x0F)]; // lower 4 bits
    }
    return new String(hex);
}

From source file:org.apache.rocketmq.jms.util.ExceptionUtil.java

public static JMSException convertToJmsException(Exception e, String extra) {
    Preconditions.checkNotNull(extra);
    Preconditions.checkNotNull(e);//  w w w . j a  v a2s.co  m
    JMSException jmsException = new JMSException(extra);
    jmsException.initCause(e);
    return jmsException;
}

From source file:com.sonar.sslr.api.typed.Optional.java

public static <T> Optional<T> of(T reference) {
    return new Present<T>(Preconditions.checkNotNull(reference));
}

From source file:com.google.api.client.discovery.IconDescription.java

static IconDescription createX16Icon(String url) {
    IconDescription instance = new IconDescription();
    instance.size = Size.X16;//from w ww . j a  va2  s  .co  m
    instance.url = Preconditions.checkNotNull(url);
    return instance;
}

From source file:com.google.devtools.j2objc.types.JavaMethod.java

/**
 * Factory method that returns a JavaMethod for a specified method binding.
 *//*w  w w  .j a v a  2 s .  co  m*/
public static JavaMethod getJavaMethod(IMethodBinding binding) {
    Preconditions.checkNotNull(binding);
    ITypeBinding classBinding = binding.getDeclaringClass();
    if (classBinding == null) {
        return null;
    }
    String clazz = classBinding.getBinaryName();
    if (clazz == null) {
        return null; // true for local variables in unreachable code
    }
    return new JavaMethod(binding, classBinding);
}

From source file:io.macgyver.core.util.JsonNodes.java

public static void sort(List<JsonNode> n, Comparator<JsonNode> comparator) {
    Preconditions.checkNotNull(n);
    Preconditions.checkNotNull(comparator);
    Collections.sort(n, comparator);
}

From source file:com.github.katjahahn.tools.visualizer.ImageUtil.java

/**
 * Appends rightImage to the right side of leftImage.
 * <p>//  w w  w  . ja  v a2  s  .  c  om
 * The resulting image type is one of leftImage.
 * 
 * @param leftImage
 *            first image, must not be null
 * @param rightImage
 *            second image that is appended to the right side of leftImage,
 *            must not be null
 * @return appended image
 */
public static BufferedImage appendImages(BufferedImage leftImage, BufferedImage rightImage) {
    Preconditions.checkNotNull(leftImage);
    Preconditions.checkNotNull(rightImage);
    int width = leftImage.getWidth() + rightImage.getWidth();
    int height = Math.max(leftImage.getHeight(), rightImage.getHeight());
    BufferedImage result = new BufferedImage(width, height, leftImage.getType());
    result.createGraphics().drawImage(leftImage, 0, 0, null);
    result.createGraphics().drawImage(rightImage, leftImage.getWidth(), 0, null);
    return result;
}