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:cz.cuni.mff.ms.brodecva.botnicek.ide.utils.data.graphs.Direction.java

/**
 * Vrt opa?nou orientaci.// ww  w  .  j  av  a 2s .  c  o m
 * 
 * @param direction
 *            orientace
 * @return opa?n orientace
 */
public static Direction getOpposite(final Direction direction) {
    Preconditions.checkNotNull(direction);

    final Direction[] values = values();
    assert values.length == 2;

    final Set<Direction> valuesSet = Sets.newHashSet(values);
    valuesSet.remove(direction);

    return valuesSet.iterator().next();
}

From source file:org.apache.aurora.common.zookeeper.Credentials.java

/**
 * Creates a set of credentials for the ZooKeeper digest authentication mechanism.
 *
 * @param username the username to authenticate with
 * @param password the password to authenticate with
 * @return a set of credentials that can be used to authenticate the zoo keeper client
 *///from  w  w  w . j av a2s  . c om
public static Credentials digestCredentials(String username, String password) {
    MorePreconditions.checkNotBlank(username);
    Preconditions.checkNotNull(password);

    // TODO(John Sirois): DigestAuthenticationProvider is broken - uses platform default charset
    // (on server) and so we just have to hope here that clients are deployed in compatible jvms.
    // Consider writing and installing a version of DigestAuthenticationProvider that controls its
    // Charset explicitly.
    return new Credentials("digest", (username + ":" + password).getBytes());
}

From source file:net.sf.lucis.core.impl.SingleSearcherProvider.java

public static SingleSearcherProvider of(final DirectoryProvider provider) {
    Preconditions.checkNotNull(provider);
    return new SingleSearcherProvider() {
        @Override// ww w .  j a v a2  s.  co  m
        Directory directory() {
            return provider.getDirectory();
        }
    };
}

From source file:ivory.smrf.model.importance.ConceptImportanceModel.java

@SuppressWarnings("unchecked")
public static ConceptImportanceModel get(Node model) throws ConfigurationException {
    Preconditions.checkNotNull(model);

    // Get model type.
    String modelType = XMLTools.getAttributeValue(model, "type", null);
    if (modelType == null) {
        throw new ConfigurationException("Model type must be specified!");
    }//w  w w .j  ava  2s.  c  o m

    // Dynamically construct importance model.
    ConceptImportanceModel importanceModel = null;
    try {
        Class<? extends ConceptImportanceModel> clz = (Class<? extends ConceptImportanceModel>) Class
                .forName(modelType);
        importanceModel = clz.newInstance();
        importanceModel.configure(model);
    } catch (Exception e) {
        throw new ConfigurationException("Error instantiating ConceptImportanceModel! " + e);
    }

    return importanceModel;
}

From source file:edu.byu.nlp.stats.SymmetricDirichletMLEFPOptimizable.java

public static SymmetricDirichletMLEFPOptimizable newOptimizable(double[][] data) {
    Preconditions.checkNotNull(data);
    Preconditions.checkArgument(data.length > 0);

    double[] meanLogTheta = Matrices.sumOverFirst(data);
    DoubleArrays.divideToSelf(meanLogTheta, data.length);
    return new SymmetricDirichletMLEFPOptimizable(meanLogTheta, data.length, data[0].length);
}

From source file:org.apache.aurora.scheduler.app.Log4jConfigurator.java

/**
 * Configures log4j to log to stderr with a glog format.
 *
 * @param glogConfig The glog configuration in effect.
 *//*from  w w w.j  a  va  2 s  . c o m*/
static void configureConsole(Configuration glogConfig) {
    Preconditions.checkNotNull(glogConfig);

    BasicConfigurator.configure(new ConsoleAppender(new GlogLayout(), ConsoleAppender.SYSTEM_ERR));
    Logger.getRootLogger().setLevel(getLevel(glogConfig));
}

From source file:org.apache.impala.catalog.HiveStorageDescriptorFactory.java

/**
 * Creates and returns a Hive StoreDescriptor for the given FileFormat and RowFormat.
 * Currently supports creating StorageDescriptors for Parquet, Text, Sequence, Avro and
 * RC file.//w  ww .j ava 2  s  . c om
 * TODO: Add support for HBase
 */
public static StorageDescriptor createSd(THdfsFileFormat fileFormat, RowFormat rowFormat) {
    Preconditions.checkNotNull(fileFormat);
    Preconditions.checkNotNull(rowFormat);

    StorageDescriptor sd = new StorageDescriptor();
    sd.setSerdeInfo(new org.apache.hadoop.hive.metastore.api.SerDeInfo());
    sd.getSerdeInfo().setParameters(new HashMap<String, String>());
    // The compressed flag is not used to determine whether the table is compressed or
    // not. Instead, we use the input format or the filename.
    sd.setCompressed(false);
    HdfsFileFormat hdfsFileFormat = HdfsFileFormat.fromThrift(fileFormat);
    sd.setInputFormat(hdfsFileFormat.inputFormat());
    sd.setOutputFormat(hdfsFileFormat.outputFormat());
    sd.getSerdeInfo().setSerializationLib(hdfsFileFormat.serializationLib());

    if (rowFormat.getFieldDelimiter() != null) {
        sd.getSerdeInfo().putToParameters("serialization.format", rowFormat.getFieldDelimiter());
        sd.getSerdeInfo().putToParameters("field.delim", rowFormat.getFieldDelimiter());
    }
    if (rowFormat.getEscapeChar() != null) {
        sd.getSerdeInfo().putToParameters("escape.delim", rowFormat.getEscapeChar());
    }
    if (rowFormat.getLineDelimiter() != null) {
        sd.getSerdeInfo().putToParameters("line.delim", rowFormat.getLineDelimiter());
    }
    return sd;
}

From source file:com.youtube.serializer.YoutubeEventClassifier.java

public static Class detectClass(String json) {
    Preconditions.checkNotNull(json);
    Preconditions.checkArgument(StringUtils.isNotEmpty(json));

    ObjectNode objectNode;//from   w  w w .ja  v  a 2s.c  om
    try {
        objectNode = (ObjectNode) mapper.readTree(json);
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }

    if (objectNode.findValue("kind") != null && objectNode.get("kind").toString().equals(VIDEO_IDENTIFIER)) {
        return Video.class;
    } else if (objectNode.findValue("kind") != null
            && objectNode.get("kind").toString().contains(CHANNEL_IDENTIFIER)) {
        return com.google.api.services.youtube.model.Channel.class;
    } else {
        return ObjectNode.class;
    }
}

From source file:com.davidbracewell.io.CharsetDetector.java

/**
 * Detects the character set for the buffer.
 *
 * @param buffer The buffer//from w  w  w  .  jav a 2s. c  om
 * @param offset where to start
 * @param length the length to read
 * @return The detected charset or null
 */
public static Charset detect(byte[] buffer, int offset, int length) {
    Preconditions.checkNotNull(buffer);
    Preconditions.checkArgument(length > 0);
    Preconditions.checkArgument(offset >= 0);

    final com.ibm.icu.text.CharsetDetector detector = new com.ibm.icu.text.CharsetDetector();
    try {
        detector.setText(new ByteArrayInputStream(buffer, offset, length));
        return Charset.forName(detector.detect().getName());
    } catch (Exception e) {
        return null;
    }
}

From source file:org.apache.aurora.common.net.InetSocketAddressHelper.java

/**
 * Attempts to parse an endpoint spec into an InetSocketAddress.
 *
 * @param value the endpoint spec//from  w  w w  . ja  v a 2  s  .  c  o m
 * @return a parsed InetSocketAddress
 * @throws NullPointerException     if {@code value} is {@code null}
 * @throws IllegalArgumentException if {@code value} cannot be parsed
 */
public static InetSocketAddress parse(String value) {
    Preconditions.checkNotNull(value);

    String[] spec = value.split(":", 2);
    if (spec.length != 2) {
        throw new IllegalArgumentException("Invalid socket address spec: " + value);
    }

    String host = spec[0];
    int port = asPort(spec[1]);

    return StringUtils.isEmpty(host) ? new InetSocketAddress(port)
            : InetSocketAddress.createUnresolved(host, port);
}