Example usage for com.google.common.collect Iterables isEmpty

Introduction

In this page you can find the example usage for com.google.common.collect Iterables isEmpty.

Prototype

public static boolean isEmpty(Iterable<?> iterable) 

Source Link

Document

Determines if the given iterable contains no elements.

Usage

From source file:com.palantir.atlasdb.keyvalue.impl.ValidatingQueryRewritingKeyValueService.java

@Override
public Map<Cell, Value> getRows(String tableName, Iterable<byte[]> rows, ColumnSelection columnSelection,
        long timestamp) {
    if (Iterables.isEmpty(rows) || columnSelection.noColumnsSelected()) {
        return ImmutableMap.of();
    }/*from  w  w w.  j  a v  a 2 s. c o m*/
    return delegate.getRows(tableName, rows, columnSelection, timestamp);
}

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From source file:org.eclipse.papyrus.infra.table.controlmode.helpers.TableMoveHelper.java

/**
 * Creates an iterable containing all the Papyrus Tables that are descending from the context.
 * //  w w w .  j  av  a2s.  c  o  m
 * @author olivier melois (Atos)
 */
public static Iterable<EObject> createDescendantTablesIterable(EObject context) {

    Set<EObject> result = Sets.newHashSet();

    TreeIterator<EObject> eAllContents = EcoreUtil.getAllProperContents(context, true); // was context.eAllContents().
    Iterator<EObject> contextAndDescendants = Iterators.concat(eAllContents,
            Iterators.singletonIterator(context));

    final Predicate<Setting> keepPapyrusTableInstances = new Predicate<Setting>() {

        public boolean apply(Setting setting) {
            boolean result = true;
            if (setting != null) {
                EObject settingEObject = setting.getEObject();
                result &= settingEObject instanceof PapyrusTableInstance;
                result &= PapyrustableinstancePackage.Literals.PAPYRUS_TABLE_INSTANCE__TABLE == setting
                        .getEStructuralFeature();
            } else {
                result = false;
            }
            return result;
        }
    };

    /*
     * Predicate used to keep the usages which are PapyrusTableInstances
     */
    Predicate<Setting> keepTableInstances = new Predicate<Setting>() {

        public boolean apply(Setting setting) {
            boolean result = true;
            if (setting != null) {
                EObject settingEObject = setting.getEObject();
                result &= settingEObject instanceof TableInstance;
                result &= setting
                        .getEStructuralFeature() == TableinstancePackage.Literals.TABLE_INSTANCE__CONTEXT;

                Collection<Setting> references = PapyrusEcoreUtils.getUsages(settingEObject);
                Iterable<Setting> papyrusTableInstances = Iterables.filter(references,
                        keepPapyrusTableInstances);
                //Veryfing that there is at least one papyrusTableInstance
                result = result && !Iterables.isEmpty(papyrusTableInstances);

            } else {
                result = false;
            }
            return result;
        }
    };

    /*
     * Function to get the eObject from a setting
     */
    Function<Setting, EObject> getEObject = new Function<Setting, EObject>() {

        public EObject apply(Setting input) {
            EObject settingEObject = input.getEObject();
            Collection<Setting> references = PapyrusEcoreUtils.getUsages(settingEObject);
            Iterable<Setting> papyrusTableInstances = Iterables.filter(references, keepPapyrusTableInstances);
            //Getting the eobject of thie first element of this iterable.
            return Iterables.get(papyrusTableInstances, 0).getEObject();
        }

    };

    /*
     * For the context and his descendants :
     */
    while (contextAndDescendants.hasNext()) {
        EObject current = contextAndDescendants.next();
        //Usages
        Iterable<Setting> usages = PapyrusEcoreUtils.getUsages(current);
        //Filtering to keep only papyrus table instances.
        Iterable<Setting> tableInstanceSettings = Iterables.filter(usages, keepTableInstances);
        //Getting the eObjects 
        Iterable<EObject> papyrusTableInstances = Iterables.transform(tableInstanceSettings, getEObject);
        //Adding all the kept usages.
        Iterables.addAll(result, papyrusTableInstances);
    }

    return result;
}

---

From source file:com.google.devtools.build.lib.rules.objc.J2ObjcSource.java

/**
 * Returns whether this {@link J2ObjcSource} contains any ObjC source (.m, .mm) files.
 *///from  ww  w  .ja v a  2s  .  co m
public boolean hasSourceFiles() {
    return !Iterables.isEmpty(objcSrcs);
}

---

From source file:org.eclipse.sirius.diagram.ui.business.internal.query.RequestQuery.java

/**
 * Checks if the current {@link Request} request is about a GMF Text drop.
 * //w w w. j  av  a2 s.co  m
 * @return true if the current {@link Request} request is about a GMF Text
 *         drop
 */
public boolean isTextDropRequest() {
    boolean isTextDropRequest = false;
    if (RequestConstants.REQ_ADD.equals(request.getType()) && request instanceof GroupRequest) {
        GroupRequest groupRequest = (GroupRequest) request;
        isTextDropRequest = !Iterables
                .isEmpty(Iterables.filter(groupRequest.getEditParts(), TextEditPart.class));
    }
    return isTextDropRequest;
}

---

From source file:org.opendaylight.yangtools.yang.model.api.SchemaPath.java

/**
 * Create a child path based on concatenation of this path and a relative path.
 *
 * @param relative Relative path/*from   w  w  w  .ja va2 s.co m*/
 * @return A new child path
 */
public SchemaPath createChild(final Iterable<QName> relative) {
    if (Iterables.isEmpty(relative)) {
        return this;
    }

    SchemaPath parentPath = this;
    for (QName qname : relative) {
        parentPath = parentPath.createInstance(parentPath, qname);
    }

    return parentPath;
}

---

From source file:com.shopzilla.hadoop.repl.HadoopREPL.java

@Override
protected void evaluate(final String input) throws ExitSignal {
    popHistory();// w  ww  .  j a  v  a2  s  . c o  m
    final Iterable<String> inputParts = ARG_SPLITTER.limit(2).split(input);
    if (Iterables.isEmpty(inputParts)) {
        // Do nothing
    } else {
        final String command = Iterables.get(inputParts, 0).toLowerCase();
        if (commandMappings.containsKey(call(command))) {
            commandMappings.get(call(command)).execute(
                    new CommandInvocation(command, Iterables
                            .toArray(ARG_SPLITTER.split(Iterables.get(inputParts, 1, "")), String.class)),
                    sessionState);
        } else {
            sessionState.output("Unknown command \"%s\"", command);
        }
        pushHistory(input);
    }
}

---

From source file:com.google.googlejavaformat.java.Formatter.java

/**
 * Construct a {@code Formatter} given a Java compilation unit. Parses the code; builds a {@link
 * JavaInput} and the corresponding {@link JavaOutput}.
 *
 * @param javaInput the input, a Java compilation unit
 * @param javaOutput the {@link JavaOutput}
 * @param options the {@link JavaFormatterOptions}
 *//*from  w ww .j  a  v  a2  s  .  c  o  m*/
static void format(final JavaInput javaInput, JavaOutput javaOutput, JavaFormatterOptions options)
        throws FormatterException {
    Context context = new Context();
    DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<>();
    context.put(DiagnosticListener.class, diagnostics);
    Options.instance(context).put("allowStringFolding", "false");
    // TODO(cushon): this should default to the latest supported source level, remove this after
    // backing out
    // https://github.com/google/error-prone-javac/commit/c97f34ddd2308302587ce2de6d0c984836ea5b9f
    Options.instance(context).put(Option.SOURCE, "9");
    JCCompilationUnit unit;
    JavacFileManager fileManager = new JavacFileManager(context, true, UTF_8);
    try {
        fileManager.setLocation(StandardLocation.PLATFORM_CLASS_PATH, ImmutableList.of());
    } catch (IOException e) {
        // impossible
        throw new IOError(e);
    }
    SimpleJavaFileObject source = new SimpleJavaFileObject(URI.create("source"), JavaFileObject.Kind.SOURCE) {
        @Override
        public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
            return javaInput.getText();
        }
    };
    Log.instance(context).useSource(source);
    ParserFactory parserFactory = ParserFactory.instance(context);
    JavacParser parser = parserFactory.newParser(javaInput.getText(), /*keepDocComments=*/ true,
            /*keepEndPos=*/ true, /*keepLineMap=*/ true);
    unit = parser.parseCompilationUnit();
    unit.sourcefile = source;

    javaInput.setCompilationUnit(unit);
    Iterable<Diagnostic<? extends JavaFileObject>> errorDiagnostics = Iterables
            .filter(diagnostics.getDiagnostics(), Formatter::errorDiagnostic);
    if (!Iterables.isEmpty(errorDiagnostics)) {
        throw FormatterException.fromJavacDiagnostics(errorDiagnostics);
    }
    OpsBuilder builder = new OpsBuilder(javaInput, javaOutput);
    // Output the compilation unit.
    new JavaInputAstVisitor(builder, options.indentationMultiplier()).scan(unit, null);
    builder.sync(javaInput.getText().length());
    builder.drain();
    Doc doc = new DocBuilder().withOps(builder.build()).build();
    doc.computeBreaks(javaOutput.getCommentsHelper(), MAX_LINE_LENGTH, new Doc.State(+0, 0));
    doc.write(javaOutput);
    javaOutput.flush();
}

---

From source file:com.facebook.buck.cli.BuckConfig.java

/**
 * Takes a sequence of {@code .buckconfig} files and loads them, in order, to create a
 * {@code BuckConfig} object. Each successive file that is loaded has the ability to override
 * definitions from a previous file./* w  ww.java  2s  .co  m*/
 * @param projectFilesystem project for which the {@link BuckConfig} is being created.
 * @param files The sequence of {@code .buckconfig} files to load.
 */
public static BuckConfig createFromFiles(ProjectFilesystem projectFilesystem, Iterable<File> files,
        Platform platform) throws IOException {
    Preconditions.checkNotNull(projectFilesystem);
    Preconditions.checkNotNull(files);
    BuildTargetParser buildTargetParser = new BuildTargetParser(projectFilesystem);

    if (Iterables.isEmpty(files)) {
        return new BuckConfig(ImmutableMap.<String, Map<String, String>>of(), projectFilesystem,
                buildTargetParser, platform);
    }

    // Convert the Files to Readers.
    ImmutableList.Builder<Reader> readers = ImmutableList.builder();
    for (File file : files) {
        readers.add(Files.newReader(file, Charsets.UTF_8));
    }
    return createFromReaders(readers.build(), projectFilesystem, buildTargetParser, platform);
}

---

From source file:org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.java

/**
 * Create a child path based on concatenation of this path and a relative path.
 *
 * @param relative Relative path/*from  w w w  .  j  ava 2 s  .  c  om*/
 * @return A new child path
 */
public SchemaNodeIdentifier createChild(final Iterable<QName> relative) {
    if (Iterables.isEmpty(relative)) {
        return this;
    }

    SchemaNodeIdentifier parentNode = this;
    for (QName qname : relative) {
        parentNode = parentNode.createInstance(parentNode, qname);
    }

    return parentNode;
}

---

From source file:eu.trentorise.opendata.commons.validation.Preconditions.java

/**
 *
 * Checks if provided iterable is non null and non empty .
 *
 * @param prependedErrorMessage the exception message to use if the check
 * fails; will be converted to a string using String.valueOf(Object) and
 * prepended to more specific error messages.
 *
 * @throws IllegalArgumentException if provided collection fails validation
 *
 * @return a non-null non-empty iterable
 *///from w  w w  . j  a  v a  2  s  . c  o m
public static <T> Iterable<T> checkNotEmpty(@Nullable Iterable<T> iterable,
        @Nullable Object prependedErrorMessage) {
    checkArgument(iterable != null, "%s -- Reason: Found null iterable.", prependedErrorMessage);
    if (Iterables.isEmpty(iterable)) {
        throw new IllegalArgumentException(
                String.valueOf(prependedErrorMessage) + " -- Reason: Found empty collection.");
    }
    return iterable;
}

---

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