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, @Nullable Object errorMessage) 

Source Link

Document

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

Usage

From source file:org.apache.flume.serialization.EventSerializerFactory.java

public static EventSerializer getInstance(String serializerType, Context context, OutputStream out) {

    Preconditions.checkNotNull(serializerType, "serializer type must not be null");

    // try to find builder class in enum of known output serializers
    EventSerializerType type;/*from www  .  ja va 2 s . co  m*/
    try {
        type = EventSerializerType.valueOf(serializerType.toUpperCase());
    } catch (IllegalArgumentException e) {
        logger.debug("Not in enum, loading builder class: {}", serializerType);
        type = EventSerializerType.OTHER;
    }
    Class<? extends EventSerializer.Builder> builderClass = type.getBuilderClass();

    // handle the case where they have specified their own builder in the config
    if (builderClass == null) {
        try {
            Class c = Class.forName(serializerType);
            if (c != null && EventSerializer.Builder.class.isAssignableFrom(c)) {
                builderClass = (Class<? extends EventSerializer.Builder>) c;
            } else {
                logger.error("Unable to instantiate Builder from {}", serializerType);
                return null;
            }
        } catch (ClassNotFoundException ex) {
            logger.error("Class not found: " + serializerType, ex);
            return null;
        }
    }

    // build the builder
    EventSerializer.Builder builder;
    try {
        builder = builderClass.newInstance();
    } catch (InstantiationException ex) {
        logger.error("Cannot instantiate builder: " + serializerType, ex);
        return null;
    } catch (IllegalAccessException ex) {
        logger.error("Cannot instantiate builder: " + serializerType, ex);
        return null;
    }

    return builder.build(context, out);
}

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From source file:com.google.security.zynamics.binnavi.Gui.GraphWindows.Implementations.CEdgeDeleter.java

/**
 * Removes an edge from a graph./*from  ww  w .  j  a va 2  s .  c  o m*/
 *
 * @param view The view from which the edge is removed.
 * @param edge The edge to remove from the graph.
 */
public static void deleteEdge(final INaviView view, final INaviEdge edge) {
    Preconditions.checkNotNull(view, "IE01727: View argument can not be null");
    Preconditions.checkNotNull(edge, "IE01728: Edge argument can not be null");

    view.getContent().deleteEdge(edge);
}

---

From source file:net.scriptability.core.util.StringUtils.java

/**
 * Returns a line by number from a source string. Handles CR+LF, CR and LF line separators.
 *
 * @param source source string//w  ww.  j  a  v a2s .  c o  m
 * @param lineNumber line number to return from source string
 * @return string representing the line at the given line number
 */
public static String getLine(final String source, final int lineNumber) {
    Preconditions.checkNotNull(source, "Source cannot be null.");
    Preconditions.checkArgument(lineNumber > 0, "Line must be greater than 0.");

    String[] lines;
    if (source.contains(CR_LF)) {
        lines = source.split(CR_LF);
    } else if (source.contains(CR)) {
        lines = source.split(CR);
    } else if (source.contains(LF)) {
        lines = source.split(LF);
    } else {
        lines = new String[] { source };
    }

    if (lineNumber > lines.length) {
        throw new IllegalArgumentException(
                "Requested line number is greater than the number of lines in source string.");
    }

    return lines[lineNumber - 1];
}

---

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

public static Optional<Country> tryGetByCode(ObjectContext context, final String code) {
    Preconditions.checkNotNull(context, "the context must be provided");
    Preconditions.checkState(!Strings.isNullOrEmpty(code));
    return getAll(context).stream().filter(a -> a.getCode().equals(code)).collect(SingleCollector.optional());
}

---

From source file:de.cosmocode.issuetracker.activecollab.ActiveCollabConnector.java

/**
 * Connects to an ActiveCollab server./*from w  w w . j  a  v a2  s.c o m*/
 *
 * @since 1.0
 * @param uri the uri to connect to
 * @param token the api token
 * @param projectId the project identifier
 * @return an {@link ActiveCollab} instance
 */
public static ActiveCollab connectActiveCollab(URI uri, String token, int projectId) {
    Preconditions.checkNotNull(uri, "URI");
    Preconditions.checkNotNull(token, "Token");
    return new DefaultActiveCollab(uri, token, projectId);
}

---

From source file:com.aionemu.gameserver.utils.audit.AuditLogger.java

public static final void info(Player player, String message) {
    Preconditions.checkNotNull(player, "Player should not be null or use different info method");
    if (LoggingConfig.LOG_AUDIT) {
        info(player.getName(), player.getObjectId(), message);
    }/* w  w  w .  j  a va2  s .c o  m*/
    if (PunishmentConfig.PUNISHMENT_ENABLE) {
        AutoBan.punishment(player, message);
    }
}

---

From source file:com.google.security.zynamics.binnavi.ZyGraph.Builders.ZyTextNodeBuilder.java

/**
 * Builds the content of the text node./* w ww. j a  v a  2 s .  com*/
 *
 * @param node The node for which the context is built.
 *
 * @return The created node content.
 */
public static ZyLabelContent buildContent(final INaviTextNode node) {
    Preconditions.checkNotNull(node, "IE01700: Node argument can not be null");
    final ZyLabelContent content = new ZyLabelContent(null);
    buildContent(content, node);
    return content;
}

---

From source file:com.github.jeluard.guayaba.lang.Runnables.java

/**
 * @param runnable//from   w w w  . ja v a2 s.  c o  m
 * @param logger
 * @return specified {@link Runnable} in a new {@link Runnable} that will intercept and log any exception thrown by {@link Runnable#run()}
 */
public static Runnable loggingExecutionFailure(final Runnable runnable, final Logger logger) {
    Preconditions.checkNotNull(runnable, "null runnable");
    Preconditions.checkNotNull(logger, "null logger");

    return new Runnable() {
        @Override
        public void run() {
            try {
                runnable.run();
            } catch (Exception e) {
                if (logger.isLoggable(Level.WARNING)) {
                    logger.log(Level.WARNING, "Exception while executing <" + runnable + ">", e);
                }
            }
        }
    };
}

---

From source file:org.locationtech.geogig.repository.RepositoryInitializer.java

/**
 * Finds a {@code RepositoryInitializer} that {@link #canHandle(URI) can handle} the given URI,
 * or throws an {@code IllegalArgumentException} if no such initializer can be found.
 * <p>/*from   w w  w .j a va  2s  .  c  o  m*/
 * The lookup method uses the standard JAVA SPI (Service Provider Interface) mechanism, by which
 * all the {@code META-INF/services/org.locationtech.geogig.repository.RepositoryInitializer}
 * files in the classpath will be scanned for fully qualified names of implementing classes.
 */
public static RepositoryInitializer lookup(URI repoURI) throws IllegalArgumentException {

    Preconditions.checkNotNull(repoURI, "Repository URI is null");

    Iterator<RepositoryInitializer> initializers = ServiceLoader.load(RepositoryInitializer.class).iterator();

    while (initializers.hasNext()) {
        RepositoryInitializer initializer = initializers.next();
        if (initializer.canHandle(repoURI)) {
            return initializer;
        }
    }
    throw new IllegalArgumentException(
            "No repository initializer found capable of handling this kind of URI: " + repoURI);
}

---

From source file:org.waveprotocol.box.server.persistence.protos.ProtoContactsDataSerializer.java

/**
 * Serialize {@link Contact} into {@link ProtoContact}.
 *///from   ww  w  .  ja v  a2 s  .c  o m
public static ProtoContacts serialize(List<Contact> contacts) {
    Preconditions.checkNotNull(contacts, "contacts is null");
    ProtoContacts.Builder protoContacts = ProtoContacts.newBuilder();
    for (Contact contact : contacts) {
        ProtoContacts.Contact.Builder protoContact = ProtoContacts.Contact.newBuilder();
        protoContact.setParticipant(contact.getParticipantId().getAddress());
        protoContact.setLastContactTime(contact.getLastContactTime());
        protoContact.setScoreBonus(contact.getScoreBonus());
    }
    return protoContacts.build();
}

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