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:com.google.appinventor.common.utils.FilenameUtils.java

/**
 * Returns the extension of a filename./*from  w  ww.ja v a  2 s.com*/
 *
 * @param filename  filename to get extension of
 * @return  extension of filename
 */
public static String getExtension(String filename) {
    Preconditions.checkNotNull(filename);

    // Separate filename from rest of pathname
    filename = filename.substring(filename.lastIndexOf('/') + 1);

    // Extract extension
    int index = filename.lastIndexOf('.');
    return index == -1 ? "" : filename.substring(index + 1);
}

From source file:com.yahoo.yqlplus.api.index.IndexName.java

public static IndexName of(String... cols) {
    Preconditions.checkNotNull(cols);
    return of(Arrays.asList(cols));
}

From source file:com.turn.splicer.tsdbutils.TsQuerySerializer.java

public static TsQuery deserializeFromJson(String jsonContent) {
    Preconditions.checkNotNull(jsonContent);
    Preconditions.checkArgument(!jsonContent.isEmpty(), "Incoming data was null or empty");

    return JSON.parseToObject(jsonContent, TsQuery.class);
}

From source file:org.mifos.sdk.internal.ServerResponseUtil.java

/**
 * Parses the server response to extract the useful message.
 * @param response the server response/*from   ww  w.ja  v  a2  s.c  om*/
 * @return the error message
 */
public static String parseResponse(final Response response) {
    Preconditions.checkNotNull(response);

    try {
        final InputStream stream = response.getBody().in();
        final InputStreamReader streamReader = new InputStreamReader(stream);
        final JsonObject responseJSON = new Gson().fromJson(streamReader, JsonObject.class);
        final JsonObject message = responseJSON.get("errors").getAsJsonArray().get(0).getAsJsonObject();
        return message.get("developerMessage").getAsString();
    } catch (IOException e) {
        throw new IllegalStateException(e.getMessage());
    }
}

From source file:org.janusgraph.util.encoding.StringEncoding.java

public static boolean isAsciiString(String input) {
    Preconditions.checkNotNull(input);
    for (int i = 0; i < input.length(); i++) {
        int c = input.charAt(i);
        if (c > 127 || c <= 0)
            return false;
    }// w  ww  .j a va2  s .  co m
    return true;
}

From source file:com.facebook.buck.java.abi.Walkers.java

public static Walker getWalkerFor(Path path) {
    Preconditions.checkNotNull(path);

    if (Files.isDirectory(path)) {
        return new DirectoryWalker(path);
    } else {//from  w  ww .jav a2s  .co m
        return new ZipWalker(path);
    }
}

From source file:org.coinj.scrypt.ScryptAlg.java

public static byte[] scryptDigest(byte[] input) {
    Preconditions.checkNotNull(input);
    try {//from   w w w.ja v a  2s. c o m
        return SCrypt.scrypt(input, input, 1024, 1, 1, 32);
    } catch (Exception e) {
        throw new RuntimeException(e); // can't happen
    }
}

From source file:org.opendaylight.iotdm.onem2m.core.utils.JsonUtils.java

/**
 * Puts the given key-value pair in the given JSON object.
 *
 * @param jsonObject The JSON object (must not be {@code null}).
 * @param key The key (must not be {@code null}).
 * @param value The value./*from ww  w .  java2 s . co  m*/
 * @return The JSON object.
 */
public static JSONObject put(JSONObject jsonObject, String key, Object value) {
    Preconditions.checkNotNull(key);
    try {
        jsonObject.put(key, value);
    } catch (JSONException e) {
        // This only happens if the key is null
    }
    return jsonObject;
}

From source file:edu.byu.nlp.util.ColumnMajorMatrices.java

public static void normalizeRows(double[] weights, int numRows) {
    Preconditions.checkNotNull(weights);
    Preconditions.checkArgument(weights.length % numRows == 0);

    int rowLength = weights.length / numRows;
    double[] rowSums = new double[numRows];
    int index = 0;
    for (int col = 0; col < rowLength; col++) {
        for (int row = 0; row < numRows; row++) {
            rowSums[row] += weights[index++];
        }/*from www .  j  a v  a 2s .  c o m*/
    }

    index = 0;
    for (int col = 0; col < rowLength; col++) {
        for (int row = 0; row < rowSums.length; row++) {
            weights[index++] /= rowSums[row];
        }
    }
}

From source file:pl.tools.UrlBuilder.java

public static URL from(String arg) {
    Preconditions.checkNotNull(arg);

    try {//  w  w w  . ja va2  s.c  o m
        return new URL(arg);
    } catch (MalformedURLException e) {
        throw new IllegalArgumentException("Invalid url specified: " + arg, e);
    }
}