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

Introduction

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

Prototype

public static void checkState(boolean expression, @Nullable Object errorMessage)

Source Link

Document

Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.

Usage

From source file:com.cloudera.oryx.als.serving.MultiRescorer.java

/**
 * @param rescorers {@link com.cloudera.oryx.als.common.Rescorer} objects to delegate to
 *///from  w w w  . j  a  v a2s. co m
public MultiRescorer(List<Rescorer> rescorers) {
    Preconditions.checkNotNull(rescorers);
    Preconditions.checkState(!rescorers.isEmpty(), "rescorers is empty");
    this.rescorers = rescorers.toArray(new Rescorer[rescorers.size()]);
}

From source file:org.sonar.javascript.cfg.BranchingBlock.java

@Override
public Set<MutableBlock> successors() {
    Preconditions.checkState(trueSuccessor != null, "Successors were not set on " + this);
    return ImmutableSet.of(trueSuccessor, falseSuccessor);
}

From source file:org.openqa.selenium.firefox.Executable.java

public Executable(File userSpecifiedBinaryPath) {
    Preconditions.checkState(userSpecifiedBinaryPath != null, "Path to the firefox binary should not be null");
    Preconditions.checkState(userSpecifiedBinaryPath.exists() && userSpecifiedBinaryPath.isFile(),
            "Specified firefox binary location does not exist or is not a real file: "
                    + userSpecifiedBinaryPath);
    binary = userSpecifiedBinaryPath;/*from w ww . ja  va  2 s . c om*/
}

From source file:com.lyndir.lanterna.view.TitledView.java

@Override
public void addChild(final View child) {
    Preconditions.checkState(getChildren().isEmpty(), "Can only add a single child to a titled view.");

    super.addChild(child);
}

From source file:com.facebook.buck.rules.AbstractSourcePath.java

@SuppressWarnings("unchecked")
@Override/*w  w  w . j a  va2s  . c  o  m*/
public int compareTo(SourcePath o) {
    if (o == this) {
        return 0;
    }

    int result = this.getClass().getName().compareTo(o.getClass().getName());
    if (result != 0) {
        return result;
    }

    Preconditions.checkState(this.getClass().equals(o.getClass()),
            "Classes are different but have the same name.");

    return this.compareReferences((T) o);
}

From source file:org.opendaylight.controller.sal.restconf.impl.EmptyNodeWrapper.java

@Override
public void setQname(final QName name) {
    Preconditions.checkState(unwrapped == null, "Cannot change the object, due to data inconsistencies.");
    this.name = name;
}

From source file:com.google.cloud.hadoop.fs.gcs.ListHelperGoogleHadoopFileSystem.java

/**
 * Factory method for constructing and initializing an instance of
 * ListHelperGoogleHadoopFileSystem which is ready to list/get FileStatus entries corresponding
 * to {@code fileInfos}./*from  ww  w. j av a2 s  .co m*/
 */
public static GoogleHadoopFileSystem createInstance(GoogleCloudStorageFileSystem gcsfs,
        Collection<FileInfo> fileInfos) throws IOException {
    Preconditions.checkState(!fileInfos.isEmpty(),
            "Cannot construct ListHelperGoogleHadoopFileSystem with empty fileInfos list!");
    List<GoogleCloudStorageItemInfo> infos = new ArrayList<>();
    URI rootUri = null;

    Set<URI> providedPaths = new HashSet<>();
    for (FileInfo info : fileInfos) {
        infos.add(info.getItemInfo());
        providedPaths.add(info.getPath());

        if (rootUri == null) {
            // Set the root URI to the first path in the collection.
            rootUri = info.getPath();
        }
    }

    // The flow for populating this doesn't bother to populate metadata entries for parent
    // directories but we know the parent directories are expected to exist, so we'll just
    // populate the missing entries explicitly here. Necessary for getFileStatus(parentOfInfo)
    // to work when using an instance of this class.
    for (FileInfo info : fileInfos) {
        URI parentPath = gcsfs.getParentPath(info.getPath());
        while (parentPath != null && !parentPath.equals(GoogleCloudStorageFileSystem.GCS_ROOT)) {
            if (!providedPaths.contains(parentPath)) {
                LOG.debug("Adding fake entry for missing parent path '{}'", parentPath);
                GoogleCloudStorageItemInfo fakeInfo = new GoogleCloudStorageItemInfo(
                        gcsfs.getPathCodec().validatePathAndGetId(parentPath, true), 0, 0, null, null);
                infos.add(fakeInfo);
                providedPaths.add(parentPath);
            }
            parentPath = gcsfs.getParentPath(parentPath);
        }
    }

    // Add in placeholder bucket info, since the bucket info won't be relevant for our listObject
    // operations.
    String tempBucket = rootUri.getAuthority();
    infos.add(new GoogleCloudStorageItemInfo(new StorageResourceId(tempBucket), 0, 0, "", ""));

    MetadataReadOnlyGoogleCloudStorage tempGcs = new MetadataReadOnlyGoogleCloudStorage(infos);
    GoogleCloudStorageFileSystem tempGcsFs = new GoogleCloudStorageFileSystem(tempGcs, gcsfs.getOptions());
    GoogleHadoopFileSystem tempGhfs = new ListHelperGoogleHadoopFileSystem(tempGcsFs);

    Configuration tempConfig = new Configuration();
    tempConfig.set(GoogleHadoopFileSystemBase.GCS_SYSTEM_BUCKET_KEY, tempBucket);
    tempConfig.setBoolean(GoogleHadoopFileSystemBase.GCS_CREATE_SYSTEM_BUCKET_KEY, false);
    tempConfig.set(GoogleHadoopFileSystemBase.GCS_WORKING_DIRECTORY_KEY, "/");
    // Set initSuperclass == false to avoid screwing up FileSystem statistics.
    tempGhfs.initialize(rootUri, tempConfig, false);
    return tempGhfs;
}

From source file:com.continuuity.weave.internal.utils.Instances.java

/**
 * Creates a new instance of the given class. It will use the default constructor if it is presents.
 * Otherwise it will try to use {@link sun.misc.Unsafe#allocateInstance(Class)} to create the instance.
 * @param clz Class of object to be instantiated.
 * @param <T> Type of the class/* ww  w . j  ava 2 s.c o  m*/
 * @return An instance of type {@code <T>}
 */
@SuppressWarnings("unchecked")
public static <T> T newInstance(Class<T> clz) {
    try {
        try {
            Constructor<T> cons = clz.getDeclaredConstructor();
            if (!cons.isAccessible()) {
                cons.setAccessible(true);
            }
            return cons.newInstance();
        } catch (Exception e) {
            // Try to use Unsafe
            Preconditions.checkState(UNSAFE != null, "Fail to instantiate with Unsafe.");
            return (T) UNSAFE_NEW_INSTANCE.invoke(UNSAFE, clz);
        }
    } catch (Exception e) {
        throw Throwables.propagate(e);
    }
}

From source file:ezbatch.amino.job.WarehausAminoJob.java

@Override
public JobOutputEstimate getJobEstimate() {
    Preconditions.checkState(config != null, "Configuration has not been set");
    return config.getEnum(CFG_JOB_ESTIMATE, JobOutputEstimate.MEDIUM);
}

From source file:org.soundboard.library.SoundLibrarian.java

private static SoundLibrary newSoundLibrary(String libraryName) {
    SoundLibrary lib = (SoundLibrary) SoundboardConfiguration.config().getClassProperty("SoundLibrary.impl");
    Preconditions.checkState(lib != null, "Error: MISSING SoundLibrary implementation ('SoundLibrary.impl')");
    lib.setName(libraryName);//from   w  ww . java  2s.c  om
    return lib;
}