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:com.github.ferstl.maven.pomenforcers.util.EnforcerRuleUtils.java

public static String evaluateProperties(String input, EnforcerRuleHelper helper) {
    if (!Strings.isNullOrEmpty(input)) {
        Matcher matcher = PROPERTY_PATTERN.matcher(input);
        StringBuffer substituted = new StringBuffer();
        while (matcher.find()) {
            String property = matcher.group();
            matcher.appendReplacement(substituted, evaluateStringProperty(property, helper));
        }//w w w.  j  a  va  2  s  .co  m
        matcher.appendTail(substituted);
        return substituted.toString();
    }
    return input;
}

From source file:uk.co.q3c.v7.base.config.ConfigUtil.java

/**
 * /*from   w  w w.  j  a v  a2  s. co m*/
 * @param base
 *            the base of the path, for example <code>$user.home</code>. Must be prefixed with $, and will be
 *            expanded using {@link System#getProperty()}. Null or empty is ignored
 * @param directory
 *            the directory within base, or if base is not specified, within default directory. Can be null or
 *            empty.
 * @param filename
 *            The filename. Cannot be null or empty
 * @return
 */
public static File fileFromPathWithVariable(String base, String directory, String filename) {
    File d;
    if (!Strings.isNullOrEmpty(base)) {
        File b = new File(expandProperty(base));
        d = new File(b, directory);
    } else {
        d = new File(directory);
    }
    File f = new File(d, filename);
    return f;
}

From source file:org.xacml4j.v30.types.StringExp.java

/**
 * Creates {@link StringExp} from given string instance
 *
 * @param v a string value/*from   w  ww.  j a  v  a  2 s  . c  o  m*/
 * @return {@link StringExp}
 * @exception IllegalArgumentException if given
 * string value is null or empty
 */
public static StringExp of(String v) {
    Preconditions.checkArgument(!Strings.isNullOrEmpty(v));
    return new StringExp(v);
}

From source file:io.druid.common.utils.UUIDUtils.java

/**
 * Generates a universally unique identifier.
 *
 * @param extraData Extra data which often takes the form of debugging information
 *
 * @return A string which is a universally unique id (as determined by java.util.UUID) with extra data. It does not conform to a UUID variant standard.
 *///  w  w  w .j  a  v  a  2 s.c om
public static String generateUuid(String... extraData) {
    String extra = null;
    if (extraData != null && extraData.length > 0) {
        final ArrayList<String> extraStrings = new ArrayList<>(extraData.length);
        for (String extraString : extraData) {
            if (!Strings.isNullOrEmpty(extraString)) {
                extraStrings.add(extraString);
            }
        }
        if (!extraStrings.isEmpty()) {
            extra = Joiner.on(UUID_DELIM).join(extraStrings);
        }
    }
    final String uuid = UUID.randomUUID().toString().replace("-", ""); // We don't use "-" in general, so remove them here.
    return extra == null ? uuid : (extra + UUID_DELIM + uuid);
}

From source file:com.addthis.hydra.job.web.KVUtils.java

private static String findFirstNonEmptyValue(KVPairs kv, String[] keys) {
    for (String key : keys) {
        if (kv.hasKey(key)) {
            String v = kv.getValue(key);
            if (!Strings.isNullOrEmpty(v)) {
                return v;
            }//from  w w  w . j  a va2  s. c  o m
        }
    }
    return null;
}

From source file:org.glowroot.DataDir.java

public static File getDataDir(Map<String, String> properties, @Nullable File glowrootJarFile) {
    String dataDirPath = properties.get("data.dir");
    if (glowrootJarFile == null) {
        // this is only for test support
        checkNotNull(dataDirPath, "Property data.dir is required when no glowroot jar file");
        return new File(dataDirPath);
    }/*from w w  w .  j  a v  a  2s.  c  o  m*/
    // empty check to support parameterized script, e.g. -Dglowroot.data.dir=${somevar}
    if (Strings.isNullOrEmpty(dataDirPath)) {
        return getDefaultDataDir(glowrootJarFile);
    }
    File dataDir = new File(dataDirPath);
    if (!dataDir.isAbsolute()) {
        return getRelativeDataDir(dataDirPath, glowrootJarFile);
    }
    return getAbsoluteDataDir(dataDir);
}

From source file:com.fanmei.pay4j.util.StringUtil.java

public static String unCapitalize(final String str) {
    if (Strings.isNullOrEmpty(str)) {
        return str;
    }/*from w w w  .  j a v a 2  s.c  o m*/

    char firstChar = str.charAt(0);
    if (Character.isLowerCase(firstChar)) {
        return str;
    }
    int strLen = str.length();
    return new StringBuilder(strLen).append(Character.toLowerCase(firstChar)).append(str.substring(1))
            .toString();
}

From source file:org.shaf.server.tag.FrameTag.java

/**
 * Generates the form ID for the specified name.
 * /*from   w ww.j ava 2 s .c  o m*/
 * @param name
 *            the form name.
 * @return the generated form ID.
 */
public static final String generateId(final String name) {
    if (Strings.isNullOrEmpty(name)) {
        return "formDefault";
    } else {
        StringBuilder id = new StringBuilder("form");
        for (String word : name.split("\\s")) {
            id.append(word.substring(0, 1).toUpperCase());
            id.append(word.substring(1).toLowerCase());
        }
        return id.toString();
    }
}

From source file:com.infinities.keystone4j.KeystonePreconditions.java

public static void requireAttribute(String attr, String value) {
    if (Strings.isNullOrEmpty(value)) {
        String message = MessageFormat.format(REQUIRE_ATTRIBUTE, attr);
        throw new ValidationException(message, null);
    }//from   w w w  .j  ava 2  s . c o m
}

From source file:com.cinchapi.concourse.util.ObjectUtils.java

/**
 * Return {@code true} if {@code value} is {@code null} or considered empty.
 * A value is considered empty if://from w  ww .  j  a v a  2  s.  co  m
 * <ul>
 * <li>It is a collection with no members</li>
 * <li>It is an array with a length of 0</li>
 * <li>It is a string with no characters</li>
 * </ul>
 * 
 * @param value
 * @return {@code true} if the object is considered null or empty
 */
public static boolean isNullOrEmpty(Object value) {
    return value == null || (value instanceof Collection && ((Collection<?>) value).isEmpty())
            || (value.getClass().isArray() && ((Object[]) value).length == 0)
            || (value instanceof String && Strings.isNullOrEmpty((String) value));
}