Example usage for com.google.common.base Optional absent

Introduction

In this page you can find the example usage for com.google.common.base Optional absent.

Prototype

public static <T> Optional<T> absent()

Source Link

Document

Returns an Optional instance with no contained reference.

Usage

From source file:com.dangdang.ddframe.rdb.sharding.parsing.parser.dialect.oracle.OracleParser.java

@Override
public Optional<String> parseAlias() {
    if (equalAny(OracleKeyword.CONNECT)) {
        return Optional.absent();
    }//  ww  w .  j  a  v a  2s.co m
    return super.parseAlias();
}

From source file:org.opendaylight.faas.fabric.general.FabricInstanceCache.java

Optional<UnderlayerNetworkType> getFabricType(FabricId fabricId) {
    Optional<FabricInstance> instance = Optional.fromNullable(cache.get(fabricId));
    if (instance.isPresent()) {
        return Optional.of(instance.get().getType());
    } else {/*from ww  w. jav  a2s . co m*/
        return Optional.absent();
    }
}

From source file:se.sics.ktoolbox.util.Either.java

public Optional<L> getOptionalLeft() {
    if (this.isRight()) {
        return Optional.fromNullable(this.getLeft());
    } else {//from   w  w  w .  j  av a 2  s. c  o  m
        return Optional.absent();
    }
}

From source file:be.nbb.demetra.dfm.output.FactorView.java

public FactorView() {
    setLayout(new BorderLayout());
    dfmResults = Optional.absent();
    factorChart = new FactorChart();

    comboBox = new JComboBox();

    comboBox.addItemListener((ItemEvent e) -> {
        updateChart();/*from   www .ja  v  a 2  s .  co  m*/
    });

    addPropertyChangeListener((PropertyChangeEvent evt) -> {
        switch (evt.getPropertyName()) {
        case DFM_RESULTS_PROPERTY:
            updateComboBox();
            updateChart();
            break;
        }
    });

    updateComboBox();
    updateChart();

    add(comboBox, BorderLayout.NORTH);
    add(factorChart, BorderLayout.CENTER);
}

From source file:appeng.core.features.ItemDefinition.java

public ItemDefinition(final Item item, final ActivityState state) {
    Preconditions.checkNotNull(item);//from   w w  w  .  ja  va 2 s .  c  o  m
    Preconditions.checkNotNull(state);

    if (state == ActivityState.Enabled) {
        this.item = Optional.of(item);
    } else {
        this.item = Optional.absent();
    }
}

From source file:qa.qcri.nadeef.core.datamodel.NadeefConfiguration.java

private static void initialize() throws Exception {
    dbConfig = new DBConfig.Builder().url(properties.getProperty("database.url"))
            .username(properties.getProperty("database.username"))
            .password(properties.getProperty("database.password"))
            .dialect(SQLDialectTools.getSQLDialect(properties.getProperty("database.type", "database.derby")))
            .build();/*from  w  w  w. jav  a  2 s.c  om*/

    if (properties.containsKey("general.fixdecisionmaker")) {
        String className = properties.getProperty("general.fixdecisionmaker");
        Class customizedClass = CommonTools.loadClass(className);
        decisionMakerClass = Optional.of(customizedClass);
    } else
        decisionMakerClass = Optional.absent();

    if (properties.containsKey("general.outputPath")) {
        String outputPathString = properties.getProperty("general.outputPath");
        File tmpPath = new File(outputPathString);
        if (tmpPath.exists() && tmpPath.isDirectory())
            outputPath = tmpPath.toPath();
        else {
            String userDir = System.getProperty("user.dir");
            tracer.info(String.format("Cannot find directory %s, we use %s as default.", outputPathString,
                    userDir));
            outputPath = new File(outputPathString).toPath();
        }
    }

    Enumeration<?> enumeration = properties.propertyNames();
    while (enumeration.hasMoreElements()) {
        String property = (String) enumeration.nextElement();
        if (property.startsWith("ruleext.")) {
            String key = property.substring("ruleext.".length());
            String builderClassName = properties.getProperty(property);
            Class builderClass = CommonTools.loadClass(builderClassName);
            @SuppressWarnings("unchecked")
            RuleBuilder writer = (RuleBuilder) (builderClass.getConstructor().newInstance());
            ruleExtension.put(key, writer);
        }
    }
}

From source file:se.sics.dozy.DozyResult.java

public DozyResult(V val) {
    this.status = Status.OK;
    this.details = Optional.absent();
    this.value = Optional.of(val);
}

From source file:gobblin.data.management.copy.watermark.CopyableFileWatermarkHelper.java

/**
 * Return Optional {@link WatermarkInterval} for {@link CopyableFile} using {@link CopyableFileWatermarkGenerator}.
 *///from www.j  ava2 s. c om
public static Optional<WatermarkInterval> getCopyableFileWatermark(CopyableFile copyableFile,
        Optional<CopyableFileWatermarkGenerator> watermarkGenerator) throws IOException {
    if (!watermarkGenerator.isPresent()) {
        return Optional.absent();
    }
    return watermarkGenerator.get().generateWatermarkIntervalForCopyableFile(copyableFile);
}

From source file:springfox.documentation.schema.Annotations.java

@SuppressWarnings("PMD")
private static <A extends Annotation> Optional<A> tryGetGetterAnnotation(
        BeanPropertyDefinition beanPropertyDefinition, Class<A> annotationClass) {

    if (beanPropertyDefinition.hasGetter()) {
        return Optional.fromNullable(beanPropertyDefinition.getGetter().getAnnotation(annotationClass));
    }//from   w  w  w .  ja  v a 2 s  . co m
    return Optional.absent();
}

From source file:com.github.ykrasik.jerminal.internal.CommandLineHistory.java

/**
 * @return Previous command line from history.
 */// w w w .  ja v a  2  s .co  m
public Optional<String> getPrevCommandLine() {
    if (history.isEmpty()) {
        return Optional.absent();
    }

    // Don't let currentIndex go below 0.
    if (currentIndex > 0) {
        currentIndex--;
    }

    return getElementAtCurrentIndex();
}