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

Introduction

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

Prototype

public static String nullToEmpty(@Nullable String string)

Source Link

Document

Returns the given string if it is non-null; the empty string otherwise.

Usage

From source file:com.streamsets.datacollector.execution.runner.cluster.SlaveCallbackManager.java

public void updateSlaveCallbackInfo(CallbackInfo callbackInfo) {
    String sdcToken = Strings.nullToEmpty(this.clusterToken);
    if (sdcToken.equals(callbackInfo.getSdcClusterToken())
            && !RuntimeInfo.UNDEF.equals(callbackInfo.getSdcURL())) {
        callbackCacheLock.lock();/*from ww  w  .java 2  s .  c o m*/
        try {
            slaveCallbackList.put(callbackInfo.getSdcURL(), callbackInfo);
        } finally {
            callbackCacheLock.unlock();
        }
    } else {
        LOG.warn("SDC Cluster token not matched");
    }
}

From source file:io.druid.query.expression.RegexpExtractExprMacro.java

@Override
public Expr apply(final List<Expr> args) {
    if (args.size() < 2 || args.size() > 3) {
        throw new IAE("Function[%s] must have 2 to 3 arguments", name());
    }//from w w w  .  j ava2 s . com

    final Expr arg = args.get(0);
    final Expr patternExpr = args.get(1);
    final Expr indexExpr = args.size() > 2 ? args.get(2) : null;

    if (!patternExpr.isLiteral() || (indexExpr != null && !indexExpr.isLiteral())) {
        throw new IAE("Function[%s] pattern and index must be literals", name());
    }

    // Precompile the pattern.
    final Pattern pattern = Pattern.compile(String.valueOf(patternExpr.getLiteralValue()));

    final int index = indexExpr == null ? 0 : ((Number) indexExpr.getLiteralValue()).intValue();
    class RegexpExtractExpr implements Expr {
        @Nonnull
        @Override
        public ExprEval eval(final ObjectBinding bindings) {
            final Matcher matcher = pattern.matcher(Strings.nullToEmpty(arg.eval(bindings).asString()));
            final String retVal = matcher.find() ? matcher.group(index) : null;
            return ExprEval.of(Strings.emptyToNull(retVal));
        }

        @Override
        public void visit(final Visitor visitor) {
            arg.visit(visitor);
            visitor.visit(this);
        }
    }
    return new RegexpExtractExpr();
}

From source file:com.sleepcamel.bsoneer.processor.generators.AnnotationInfo.java

public AnnotationInfo(TypeMirror tm, String idProperty, boolean keepNonIdProperty, TypeMirror idGeneratorType,
        boolean customGenerator) {
    this.tm = tm;
    if (tm.getKind() != TypeKind.DECLARED) {
        throw new RuntimeException(tm + " should be declared");
    }//from www.j a v a2 s  .  c om
    DeclaredType dt = (DeclaredType) tm;
    List<? extends TypeMirror> typeArguments = dt.getTypeArguments();
    if (typeArguments != null) {
        for (TypeMirror tms : typeArguments) {
            if (tms instanceof TypeVariable) {
                typeVariables.add((TypeVariable) tms);
            } else if (tms instanceof WildcardType) {
                typeWildcards.add((WildcardType) tms);
            }
        }
    }
    this.idGeneratorType = idGeneratorType;
    this.customGenerator = customGenerator;
    this.idProperty = Strings.nullToEmpty(idProperty).trim();
    this.keepNonIdProperty = keepNonIdProperty;
}

From source file:tech.sirwellington.alchemy.http.Step3Impl.java

@Override
public AlchemyRequest.Step3 usingHeader(String key, String value) throws IllegalArgumentException {
    checkThat(key).usingMessage("missing key").is(nonEmptyString());

    //Value of an HTTP Header can be empty ?
    value = Strings.nullToEmpty(value);

    Map<String, String> requestHeaders = Maps.newHashMap();

    //Keep existing headers
    if (request.getRequestHeaders() != null) {
        requestHeaders.putAll(request.getRequestHeaders());
    }/*from   w  w  w. j  av  a  2 s  .c om*/

    requestHeaders.put(key, value);

    this.request = HttpRequest.Builder.from(request).usingRequestHeaders(requestHeaders).build();

    return this;
}

From source file:org.attribyte.api.pubsub.impl.server.util.ServerUtil.java

/**
 * Gets an integer value from a servlet request.
 * @param request The request.//from  www  .j a  v a2 s. c  o m
 * @param name The parameter name.
 * @param defaultValue The default value.
 * @return The request or default value.
 */
public static int getParameter(final HttpServletRequest request, final String name, final int defaultValue) {
    String intVal = Strings.nullToEmpty(request.getParameter(name)).trim();
    try {
        return intVal.isEmpty() ? defaultValue : Integer.parseInt(intVal);
    } catch (NumberFormatException nfe) {
        return defaultValue;
    }
}

From source file:ealvatag.tag.id3.valuepair.EventTimingTimestampTypes.java

@Override
public String getValue(final int key) {
    if (!EVENT_TIMING_ID_RANGE.contains(key)) {
        return "";
    }/*www  .  j ava  2  s.co m*/
    return Strings.nullToEmpty(values[key - EVENT_TIMING_ID_RANGE.getLowerBounds()]);
}

From source file:com.google.devtools.treeshaker.TreeShaker.java

public TreeShaker(Options options) throws IOException {
    this.options = options;
    j2objcOptions = new com.google.devtools.j2objc.Options();
    j2objcOptions.load(new String[] { "-sourcepath", Strings.nullToEmpty(options.getSourcepath()), "-classpath",
            Strings.nullToEmpty(options.getClasspath()), "-encoding", options.fileEncoding(), "-source",
            options.sourceVersion().flag() });
}

From source file:io.druid.query.expression.LikeExprMacro.java

@Override
public Expr apply(final List<Expr> args) {
    if (args.size() < 2 || args.size() > 3) {
        throw new IAE("Function[%s] must have 2 or 3 arguments", name());
    }//from w w  w  . j a v a2 s  .  c o m

    final Expr arg = args.get(0);
    final Expr patternExpr = args.get(1);
    final Expr escapeExpr = args.size() > 2 ? args.get(2) : null;

    if (!patternExpr.isLiteral() || (escapeExpr != null && !escapeExpr.isLiteral())) {
        throw new IAE("pattern and escape must be literals");
    }

    final String escape = escapeExpr == null ? null : (String) escapeExpr.getLiteralValue();
    final Character escapeChar;

    if (escape != null && escape.length() != 1) {
        throw new IllegalArgumentException("Escape must be null or a single character");
    } else {
        escapeChar = escape == null ? null : escape.charAt(0);
    }

    final LikeDimFilter.LikeMatcher likeMatcher = LikeDimFilter.LikeMatcher
            .from(Strings.nullToEmpty((String) patternExpr.getLiteralValue()), escapeChar);

    class LikeExtractExpr implements Expr {
        @Nonnull
        @Override
        public ExprEval eval(final ObjectBinding bindings) {
            return ExprEval.of(likeMatcher.matches(arg.eval(bindings).asString()), ExprType.LONG);
        }

        @Override
        public void visit(final Visitor visitor) {
            arg.visit(visitor);
            visitor.visit(this);
        }
    }
    return new LikeExtractExpr();
}

From source file:fathom.xmlrpc.XmlRpcMethodRegistrar.java

public void addMethodGroup(String methodGroup, Class<?> methodGroupClass) {
    Object methodsObject = injector.getInstance(methodGroupClass);
    methodGroups.put(Strings.nullToEmpty(methodGroup),
            new XmlRpcMethodInvoker(methodGroup, methodGroupClass, methodsObject));
}

From source file:com.zimbra.cs.redolog.op.CreateFolderPath.java

public CreateFolderPath(int mailboxId, String path, Folder.FolderOptions fopt) {
    this();//from   w w w  .  j  a  va2  s  .  c om
    setMailboxId(mailboxId);
    this.path = path == null ? "" : path;
    this.attrs = fopt.getAttributes();
    this.defaultView = fopt.getDefaultView();
    this.flags = fopt.getFlags();
    this.color = fopt.getColor().getValue();
    this.url = Strings.nullToEmpty(fopt.getUrl());
    this.date = fopt.getDate();
    this.custom = fopt.getCustomMetadata();
}