Example usage for com.google.common.base Strings isNullOrEmpty

Introduction

In this page you can find the example usage for com.google.common.base Strings isNullOrEmpty.

Prototype

public static boolean isNullOrEmpty(@Nullable String string)

Source Link

Document

Returns true if the given string is null or is the empty string.

Usage

From source file:org.datacleaner.documentation.DocumentationUtils.java

/**
 * Formats a string (typically a component {@link Description}) into an
 * appropriate set of HTML paragraphs ('p' tag).
 * /*w  w w. j a  va  2  s  . c  o  m*/
 * @param str
 * @return
 */
public static String createHtmlParagraphs(String str) {
    if (Strings.isNullOrEmpty(str)) {
        return "";
    }
    str = "<p>" + str + "</p>";
    str = StringUtils.replaceAll(str, "\n\n", "\n");
    str = StringUtils.replaceAll(str, "\n", "</p><p>");
    return str;
}

From source file:com.google.cloud.tools.appengine.cloudsdk.internal.args.Args.java

/**
 * Produces the flag form of a string value.
 *
 * @return {@code [--name, value]} or {@code []} if value is null.
 *///from  w w w  .ja  v a2 s .  co  m
static List<String> string(String name, String value) {
    if (!Strings.isNullOrEmpty(value)) {
        return Arrays.asList("--" + name, value);
    }
    return Collections.emptyList();
}

From source file:net.ltgt.guice.neo4j.Neo4jIndexProviders.java

public static Provider<Index<Node>> indexForNodes(final String name) {
    Preconditions.checkArgument(!Strings.isNullOrEmpty(name));
    return new Provider<Index<Node>>() {

        @Inject/*from  ww  w.  ja  va  2 s.  c o m*/
        IndexManager indexManager;

        @Override
        public Index<Node> get() {
            return indexManager.forNodes(name);
        }
    };
}

From source file:org.apache.druid.common.guava.GuavaUtils.java

/**
 * To fix semantic difference of Longs.tryParse() from Long.parseLong (Longs.tryParse() returns null for '+' started value)
 *//*from ww w  . jav a 2s. co  m*/
@Nullable
public static Long tryParseLong(@Nullable String string) {
    return Strings.isNullOrEmpty(string) ? null
            : Longs.tryParse(string.charAt(0) == '+' ? string.substring(1) : string);
}

From source file:org.apache.hadoop.hive.ql.exec.DagUtils.java

public static String getQueryName(Configuration conf) {
    String name = HiveConf.getVar(conf, HiveConf.ConfVars.HIVEQUERYNAME);
    if (Strings.isNullOrEmpty(name)) {
        return conf.get(MRJobConfig.JOB_NAME);
    } else {/* w  ww.  jav a  2 s  .  c  o m*/
        return name + " (" + conf.get(DagUtils.MAPREDUCE_WORKFLOW_NODE_NAME) + ")";
    }
}

From source file:com.dssmp.watch.util.RequestUtil.java

/**
 * ?//from w  w  w . ja  va2s.co m
 *
 * @param request
 * @param paraName
 * @param def
 * @return
 */
public static int getInt(HttpServletRequest request, String paraName, int def) {
    int res = def;
    String value = request.getParameter(paraName);
    if (!Strings.isNullOrEmpty(value))
        res = Integer.valueOf(value);
    return res;
}

From source file:com.google.enterprise.connector.notes.GsaUtil.java

static Collection<String> getGsaGroups(Collection<?> notesGroups, String groupPrefix) {
    if (notesGroups == null || notesGroups.size() == 0) {
        return Collections.emptySet();
    }/* w ww  .  ja  v a2 s .  c  om*/
    LinkedHashSet<String> gsaGroups = new LinkedHashSet<String>(notesGroups.size());
    // Prefix group names with the configured prefix.
    // Allow no prefix.
    if (Strings.isNullOrEmpty(groupPrefix)) {
        groupPrefix = "";
    } else if (!groupPrefix.endsWith("/")) {
        groupPrefix += "/";
    }
    for (Object groupObj : notesGroups) {
        String group = groupObj.toString();
        try {
            gsaGroups.add(URLEncoder.encode(groupPrefix + group.toLowerCase(), "UTF-8"));
        } catch (UnsupportedEncodingException e) {
            throw new AssertionError(e);
        }
    }
    return gsaGroups;
}

From source file:com.palantir.atlasdb.rocksdb.RocksDbNativeLibraryLoader.java

public static void load(String tmpDir) {
    String envTmpDir = System.getenv(ENV_VAR);
    if (!Strings.isNullOrEmpty(envTmpDir) && !envTmpDir.equals(tmpDir)) {
        throw new IllegalArgumentException("The temp dir for " + "native rocksdb libraries has been set to "
                + tmpDir + " by your kvs prefs, and to " + envTmpDir + " by the " + ENV_VAR
                + " environment variable.");
    }//from w  ww .  ja v a2s .  c o m
    if (staticTmpDir.compareAndSet(null, tmpDir)) {
        try {
            NativeLibraryLoader.getInstance().loadLibrary(tmpDir);
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
    } else if (!staticTmpDir.get().equals(tmpDir)) {
        log.error("Cannot load native rocksdb libraries to {}, " + "native libraries were already loaded to {}",
                tmpDir, staticTmpDir.get());
    }
}

From source file:org.apache.kylin.metrics.lib.ActiveReservoirReporter.java

public static Pair<String, String> getTableNameSplits(String tableName) {
    if (Strings.isNullOrEmpty(tableName)) {
        return null;
    }/*from  ww w  .  j ava  2s  . c  o m*/

    String[] splits = tableName.split(Pattern.quote("."));
    int i = 0;
    String database = splits.length == 1 ? KYLIN_PREFIX : splits[i++];
    String tableNameOnly = splits[i];
    return new Pair(database, tableNameOnly);
}

From source file:com.streamsets.pipeline.lib.xml.xpath.XPathValidatorUtil.java

public static String getXPathValidationError(String expression) {
    if (Strings.isNullOrEmpty(expression)) {
        return Constants.ERROR_EMPTY_EXPRESSION;
    } else if (expression.charAt(0) != Constants.PATH_SEPARATOR_CHAR) {
        if (expression.indexOf(Constants.PATH_SEPARATOR_CHAR) < 0) {
            // "legacy" expression
            if (XMLChar.isValidName(expression)) {
                return null;
            } else {
                return Constants.ERROR_INVALID_ELEMENT_NAME_PREFIX + expression;
            }//from w  ww .j  a  v a 2s .  c o  m
        } else {
            // expression that does not start with separator but is otherwise an XPath - not allowed
            return Constants.ERROR_XPATH_MUST_START_WITH_SEP + Constants.PATH_SEPARATOR_CHAR;
        }
    }

    boolean firstEmptyStringSeen = false;
    for (String str : expression.split(Constants.PATH_SEPARATOR)) {
        if (Strings.isNullOrEmpty(str)) {
            if (firstEmptyStringSeen) {
                return Constants.ERROR_DESCENDENT_OR_SELF_NOT_SUPPORTED;
            }
            firstEmptyStringSeen = true;
            continue;
        }
        final int predicateStartInd = str.indexOf('[');
        String elementName = str;
        if (predicateStartInd > 0) {
            elementName = str.substring(0, predicateStartInd);
            final String predicate = str.substring(predicateStartInd);
            final Matcher matcher = VALID_PREDICATE_PATTERN.matcher(predicate);
            if (!matcher.matches()) {
                return Constants.ERROR_INVALID_PREDICATE_PREFIX + predicate;
            } else {
                final String attributeName = matcher.group(1);
                if (!Strings.isNullOrEmpty(attributeName) && !XMLChar.isValidName(attributeName)) {
                    return Constants.ERROR_INVALID_ATTRIBUTE_PREFIX + attributeName;
                }
            }
        }
        if (!Constants.WILDCARD.equals(elementName) && !XMLChar.isValidName(elementName)) {
            return Constants.ERROR_INVALID_ELEMENT_NAME_PREFIX + elementName;
        }
    }
    return null;
}