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:monasca.common.util.Exceptions.java

/** Throw <b>any</b> exception as a RuntimeException. */
public static RuntimeException sneakyThrow(Throwable throwable) {
    Preconditions.checkNotNull(throwable, "throwable");
    Exceptions.<RuntimeException>sneakyThrow0(throwable);
    return null;// ww w . ja v a 2  s  . co  m
}

From source file:de.cosmocode.collections.Procedures.java

/**
 * Chains multiple {@link Procedure}s together into a single one.
 * //from  w w w.  jav  a 2s.c  o  m
 * @param <T> the generic procedure type
 * @param first the first procedure
 * @param second the second procedure
 * @param rest the rest
 * @return a {@link Procedure} containing all given {@link Procedure}
 * @throws NullPointerException if any parameter is null
 */
public static <T> Procedure<T> chain(final Procedure<? super T> first, final Procedure<? super T> second,
        final Iterable<? extends Procedure<? super T>> rest) {
    Preconditions.checkNotNull(first, "First");
    Preconditions.checkNotNull(second, "Second");
    Preconditions.checkNotNull(rest, "Rest");
    return new Procedure<T>() {

        @Override
        public void apply(T input) {
            first.apply(input);
            second.apply(input);
            for (Procedure<? super T> procedure : rest) {
                procedure.apply(input);
            }
        }

    };
}

From source file:pt.ua.ri.utils.Divisions.java

public static int countExistingDivisions(final Path indexDir) throws IOException {
    Preconditions.checkNotNull(indexDir, "Directory Path cannot be null");
    return (int) Files.walk(indexDir, 1).filter(Files::isRegularFile).filter(pathMatcher::matches).count();
}

From source file:com.google.security.zynamics.zylib.gml.GmlConverter.java

/**
 * Creates GML code that represents a given directed graph.
 * //from w  w w.  j a  v  a 2 s . co  m
 * @param graph The input graph.
 * 
 * @return The code generated for the input graph.
 */
public static String toGml(final IDirectedGraph<?, ? extends IGraphEdge<?>> graph) {
    Preconditions.checkNotNull(graph, "Graph argument can not be null");

    final StringBuilder sb = new StringBuilder();

    sb.append("graph\n" + "[\n");

    int currentId = 0;

    final Map<Object, Integer> nodeMap = new HashMap<>();

    for (final Object node : graph.getNodes()) {
        sb.append("\tnode\n" + "\t[\n" + "\tid " + "\n");
        sb.append(currentId);
        sb.append("\tlabel \"");
        sb.append(node);
        sb.append("\"\n" + "\t]\n");

        nodeMap.put(node, currentId);

        ++currentId;
    }

    for (final IGraphEdge<?> edge : graph.getEdges()) {
        sb.append("\tedge\n" + "\t[\n" + "\tsource ");
        sb.append(nodeMap.get(edge.getSource()));
        sb.append("\n" + "\ttarget ");
        sb.append(nodeMap.get(edge.getTarget()));
        sb.append("\n" + "\tgraphics\n" + "\t[\n" + "\t\tfill \"#000000\"\n" + "\t\ttargetArrow \"standard\"\n"
                + "\t]\n" + "\t]\n");
    }

    sb.append("]\n");

    return sb.toString();
}

From source file:io.crate.sql.tree.QualifiedName.java

public static QualifiedName of(String first, String... rest) {
    Preconditions.checkNotNull(first, "first is null");
    return new QualifiedName(ImmutableList.copyOf(Lists.asList(first, rest)));
}

From source file:de.cosmocode.palava.ipc.netty.ChannelBuffering.java

/**
 * Adapts a {@link ChannelBuffer} to an {@link InputStream}.
 * /*from w  ww  .  ja v a 2s . c  om*/
 * @deprecated use {@link ChannelBufferInputStream}
 * @param buffer the underlying channel buffer
 * @return an inputstream which reads from the given channel buffer
 * @throws NullPointerException if buffer is null
 */
@Deprecated
public static InputStream asInputStream(final ChannelBuffer buffer) {
    Preconditions.checkNotNull(buffer, "Buffer");
    return new ChannelBufferInputStream(buffer);
}

From source file:com.supaham.commons.bukkit.PlayerTeleportFix.java

private static PlayersSupplierFor<Player> getPlayerTrackingRange(Plugin plugin) {
    Preconditions.checkNotNull(plugin, "plugin cannot be null.");
    final Server server = plugin.getServer();
    // TODO support spigot
    final double radius = server.getViewDistance() * 16;

    // The following is a playersByRadius wrapper that passes the given player's location
    return new PlayersSupplierFor<Player>() {
        PlayersSupplierFor<Location> delegate = Players.playersByRadius(null, radius);

        @Override//from  w ww. java 2s.c  om
        public Collection<Player> get(Player player) {
            return delegate.get(player.getLocation());
        }
    };
}

From source file:de.cosmocode.palava.ipc.xml.rpc.adapters.Adapters.java

/**
 * Adapts the specified adapter to the {@link Function} interface using {@link Adapter#decode(Object)}.
 * /*from ww w.ja  va  2 s  . c o  m*/
 * @since 1.0
 * @param <F> source type
 * @param <T> target type
 * @param adapter the backing adapter
 * @return a function using the decode method of the given adapter
 * @throws NullPointerException if adapter is null
 */
public static <F, T> Function<F, T> asDecoder(final Adapter<? super F, ? extends T> adapter) {
    Preconditions.checkNotNull(adapter, "Adapter");
    return new Function<F, T>() {

        @Override
        public T apply(F from) {
            return adapter.decode(from);
        }

        @Override
        public String toString() {
            return String.format("Adapters.asDecoder(%s)", adapter);
        }

    };
}

From source file:org.kitesdk.data.spi.filesystem.FileSystemUtil.java

/**
 * Creates, if necessary, the given the location for {@code descriptor}.
 *
 * @param conf A Configuration/*from ww  w .j a v  a2  s.c om*/
 * @param descriptor A DatasetDescriptor
 * @throws DatasetIOException
 * @since 0.13.0
 */
public static void ensureLocationExists(DatasetDescriptor descriptor, Configuration conf) {
    Preconditions.checkNotNull(descriptor.getLocation(),
            "Cannot get FileSystem for a descriptor with no location");

    Path dataPath = new Path(descriptor.getLocation());
    FileSystem fs = null;

    try {
        fs = dataPath.getFileSystem(conf);
    } catch (IOException e) {
        throw new DatasetIOException("Cannot get FileSystem for descriptor: " + descriptor, e);
    }

    try {
        if (!fs.exists(dataPath)) {
            fs.mkdirs(dataPath);
        }
    } catch (IOException e) {
        throw new DatasetIOException("Cannot access data location", e);
    }
}

From source file:com.outerspacecat.cassandra.Cassandra.java

/**
 * Creates a list of mutations based on {@code columns}.
 * /*  w w w . ja  v a  2  s.c  om*/
 * @param columns the columns to update. Must be non {@code null}, all
 *        elements must be non {@code null}, may be empty.
 * @return a list of mutations. Never {@code null}.
 */
public static ImmutableList<Mutation> mutations(final Column... columns) {
    Preconditions.checkNotNull(columns, "columns required");
    for (Column column : columns)
        Preconditions.checkNotNull(column, "all columns must be non null");

    ImmutableList.Builder<Mutation> b = ImmutableList.builder();
    for (Column c : columns)
        b.add(new Mutation().setColumn_or_supercolumn(new ColumnOrSuperColumn().setColumn(c)));
    return b.build();
}