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:com.gmail.tracebachi.DeltaExecutor.DeltaExecutor.java

public static DeltaExecutor instance() {
    return Preconditions.checkNotNull(instance, "DeltaExecutor has not been initialized yet.");
}

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

public static EventDeserializer getInstance(String deserializerType, Context context,
        ResettableInputStream in) {//  w  w  w .  j av  a  2 s . c o  m

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

    // try to find builder class in enum of known output serializers
    EventDeserializerType type;
    try {
        type = EventDeserializerType.valueOf(deserializerType.toUpperCase());
    } catch (IllegalArgumentException e) {
        logger.debug("Not in enum, loading builder class: {}", deserializerType);
        type = EventDeserializerType.OTHER;
    }
    Class<? extends EventDeserializer.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(deserializerType);
            if (c != null && EventDeserializer.Builder.class.isAssignableFrom(c)) {
                builderClass = (Class<? extends EventDeserializer.Builder>) c;
            } else {
                String errMessage = "Unable to instantiate Builder from " + deserializerType
                        + ": does not appear to implement " + EventDeserializer.Builder.class.getName();
                throw new FlumeException(errMessage);
            }
        } catch (ClassNotFoundException ex) {
            logger.error("Class not found: " + deserializerType, ex);
            throw new FlumeException(ex);
        }
    }

    // build the builder
    EventDeserializer.Builder builder;
    try {
        builder = builderClass.newInstance();
    } catch (InstantiationException ex) {
        String errMessage = "Cannot instantiate builder: " + deserializerType;
        logger.error(errMessage, ex);
        throw new FlumeException(errMessage, ex);
    } catch (IllegalAccessException ex) {
        String errMessage = "Cannot instantiate builder: " + deserializerType;
        logger.error(errMessage, ex);
        throw new FlumeException(errMessage, ex);
    }

    return builder.build(context, in);
}

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");
    }/* ww w  .  ja va2s  .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);
}

From source file:fr.xebia.cloud.cloudinit.FreemarkerUtils.java

/**
 * /*  w w  w .j a v a  2 s.  c  o  m*/
 * @param rootMap
 *            root node of the freemarker datamodel.
 * @param templatePath
 *            classpath of the template
 * @return generated file
 */
@SuppressWarnings("unchecked")
@Nonnull
public static String generate(@Nullable Map<String, Object> rootMap, @Nonnull String templatePath) {
    Preconditions.checkNotNull(templatePath, "'templatePath' can NOT be null");
    rootMap = (Map<String, Object>) Objects.firstNonNull(rootMap, Collections.emptyMap());

    try {
        Configuration cfg = new Configuration();
        cfg.setClassForTemplateLoading(FreemarkerUtils.class, "/");

        Template template = cfg.getTemplate(templatePath);
        Writer out = new StringWriter();
        template.process(rootMap, out);
        return out.toString();
    } catch (IOException e) {
        throw Throwables.propagate(e);
    } catch (TemplateException e) {
        throw Throwables.propagate(e);
    }
}

From source file:works.chatterbox.hooks.ircchannels.tasks.SaveChannelsTask.java

public SaveChannelsTask(@NotNull final IRCChannels ircChannels) {
    Preconditions.checkNotNull(ircChannels, "ircChannels was null");
    this.ircChannels = ircChannels;
}

From source file:com.outerspacecat.util.Appendables.java

public static Writer tee(final Appendable a1, final Appendable a2) {
    Preconditions.checkNotNull(a1, "a1 required");
    Preconditions.checkNotNull(a2, "a2 required");

    return new Writer() {
        private boolean closed;

        @Override/*from   www .ja  v a2s . co  m*/
        public void write(final char[] cbuf, final int off, final int len) throws IOException {
            a1.append(CharBuffer.wrap(cbuf, off, len));
            a2.append(CharBuffer.wrap(cbuf, off, len));
        }

        @Override
        public void flush() throws IOException {
            if (a1 instanceof Flushable)
                ((Flushable) a1).flush();
            if (a2 instanceof Flushable)
                ((Flushable) a2).flush();
        }

        @Override
        public void close() throws IOException {
            if (closed)
                return;

            if (a1 instanceof Closeable)
                ((Closeable) a1).close();
            if (a2 instanceof Closeable)
                ((Closeable) a2).close();

            closed = true;
        }
    };
}

From source file:org.sonar.db.qualityprofile.ActiveRuleKey.java

/**
 * Create a key. Parameters are NOT null.
 *///ww w.  j  a v a 2s . c  o  m
public static ActiveRuleKey of(String qualityProfileKey, RuleKey ruleKey) {
    Preconditions.checkNotNull(qualityProfileKey, "QProfile is missing");
    Preconditions.checkNotNull(ruleKey, "RuleKey is missing");
    return new ActiveRuleKey(qualityProfileKey, ruleKey);
}

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

/**
 * Toggles the state of proximity browsing in the graph.
 *
 * @param parent Parent window used to display dialogs.
 * @param graph The graph where proximity browsing is switched on or off.
 *//*from   w w  w  .j  ava 2  s  .c  o m*/
public static void toggleProximityBrowsing(final JFrame parent, final ZyGraph graph) {
    Preconditions.checkNotNull(parent, "IE01750: Parent argument can not be null");

    Preconditions.checkNotNull(graph, "IE01751: Graph argument can not be null");

    if (graph.getSettings().getProximitySettings().getProximityBrowsing()) {
        CProgressDialog.showEndless(parent, "Switching off proximity browsing", new ProximityWaiter(graph));
    } else {
        CProgressDialog.showEndless(parent, "Switching on proximity browsing", new ProximityWaiter(graph));
    }
}

From source file:org.waveprotocol.box.server.authentication.AccountStoreHolder.java

synchronized public static void init(AccountStore store, String defaultDomain) {
    Preconditions.checkNotNull(store, "Account store cannot be null");
    Preconditions.checkNotNull(defaultDomain, "Default domain cannot be null");
    Preconditions.checkState(AccountStoreHolder.store == null, "Account store already set");
    AccountStoreHolder.store = store;//from  w  w  w. j ava  2s .  c o m
    AccountStoreHolder.defaultDomain = defaultDomain.toLowerCase();
}

From source file:org.opendaylight.controller.remote.rpc.messages.ErrorResponse.java

public ErrorResponse(final Exception e) {
    Preconditions.checkNotNull(e, "Exception should be present for error message");
    this.exception = e;
}