Example usage for java.util Collection iterator

Introduction

In this page you can find the example usage for java.util Collection iterator.

Prototype

Iterator<E> iterator();

Source Link

Document

Returns an iterator over the elements in this collection.

Usage

From source file:Main.java

/**
 * Splits a collection in <tt>n</tt> new collections. The last collection may contain more elements than the others
 * if {@code set.size() % n != 0}./*  w w w .jav a  2 s  .c o m*/
 *
 * @param set the input collection
 * @param n   the number of new collections
 * @param <T> the element type
 * @return a list containing the new collections
 */
public static <T> List<T>[] split(Collection<T> set, int n) {
    if (set.size() >= n) {
        @SuppressWarnings("unchecked")
        List<T>[] arrays = new List[n];
        int minSegmentSize = (int) Math.floor(set.size() / (double) n);

        int start = 0;
        int stop = minSegmentSize;

        Iterator<T> it = set.iterator();

        for (int i = 0; i < n - 1; i++) {
            int segmentSize = stop - start;
            List<T> segment = new ArrayList<T>(segmentSize);
            for (int k = 0; k < segmentSize; k++) {
                segment.add(it.next());
            }
            arrays[i] = segment;
            start = stop;
            stop += segmentSize;
        }

        int segmentSize = set.size() - start;
        List<T> segment = new ArrayList<T>(segmentSize);
        for (int k = 0; k < segmentSize; k++) {
            segment.add(it.next());
        }
        arrays[n - 1] = segment;

        return arrays;
    } else {
        throw new IllegalArgumentException("n must not be smaller set size!");
    }
}

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From source file:mitm.test.TestUtils.java

public static X509Certificate loadCertificate(File file)
        throws CertificateException, NoSuchProviderException, FileNotFoundException {
    Collection<? extends Certificate> certificates = CertificateUtils.readCertificates(file);

    if (certificates != null && certificates.size() > 0) {
        return (X509Certificate) certificates.iterator().next();
    }//from  w  ww  .j a  v  a 2 s . c  om

    return null;
}

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From source file:eu.medsea.util.EncodingGuesser.java

/**
 * Utility method to get all of the current encoding names, in canonical format, supported by your JVM
 * at the time this is called./*from w w w . j  av a  2  s .com*/
 * @return current Collection of canonical encoding names
 */
public static Collection getCanonicalEncodingNamesSupportedByJVM() {
    Collection encodings = new TreeSet();

    SortedMap charSets = Charset.availableCharsets();
    Collection charSetNames = charSets.keySet();
    for (Iterator it = charSetNames.iterator(); it.hasNext();) {
        encodings.add((String) it.next());
    }
    if (log.isDebugEnabled()) {
        log.debug("The following [" + encodings.size() + "] encodings will be used: " + encodings);
    }
    return encodings;
}

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From source file:it.cnr.icar.eric.common.security.X509Parser.java

/**
 * Parses a X509Certificate from a DER formatted input stream. Uses the 
 * BouncyCastle provider if available./*w  ww .ja va2s .  co  m*/
 *
 * @param inStream The DER InputStream with the certificate.
 * @return X509Certificate parsed from stream.
 * @throws JAXRException in case of IOException or CertificateException
 *  while parsing the stream.
 */
public static X509Certificate parseX509Certificate(InputStream inStream) throws JAXRException {
    try {
        //possible options
        // - der x509 generated by keytool -export
        // - der x509 generated by openssh x509 (might require BC provider)

        // Get the CertificateFactory to parse the stream
        // if BouncyCastle provider available, use it
        CertificateFactory cf;
        try {
            Class<?> clazz = Class.forName("org.bouncycastle.jce.provider.BouncyCastleProvider");
            Constructor<?> constructor = clazz.getConstructor(new Class[] {});
            Provider bcProvider = (Provider) constructor.newInstance(new Object[] {});
            Security.addProvider(bcProvider);
            cf = CertificateFactory.getInstance("X.509", "BC");
        } catch (Exception e) {
            // log error if bc present but failed to instanciate/add provider
            if (!(e instanceof ClassNotFoundException)) {
                log.error(CommonResourceBundle.getInstance()
                        .getString("message.FailedToInstantiateBouncyCastleProvider"));
            }
            // fall back to default provider
            cf = CertificateFactory.getInstance("X.509");
        }

        // Read the stream to a local variable
        DataInputStream dis = new DataInputStream(inStream);
        byte[] bytes = new byte[dis.available()];
        dis.readFully(bytes);
        ByteArrayInputStream certStream = new ByteArrayInputStream(bytes);

        // Parse the cert stream
        int i = 0;
        Collection<? extends Certificate> c = cf.generateCertificates(certStream);
        X509Certificate[] certs = new X509Certificate[c.toArray().length];
        for (Iterator<? extends Certificate> it = c.iterator(); it.hasNext();) {
            certs[i++] = (X509Certificate) it.next();
        }

        // Some logging..
        if (log.isDebugEnabled()) {
            if (c.size() == 1) {
                log.debug("One certificate, no chain.");
            } else {
                log.debug("Certificate chain length: " + c.size());
            }
            log.debug("Subject DN: " + certs[0].getSubjectDN().getName());
            log.debug("Issuer DN: " + certs[0].getIssuerDN().getName());
        }

        // Do we need to return the chain?
        // do we need to verify if cert is self signed / valid?
        return certs[0];
    } catch (CertificateException e) {
        String msg = CommonResourceBundle.getInstance().getString("message.parseX509CertificateStreamFailed",
                new Object[] { e.getClass().getName(), e.getMessage() });
        throw new JAXRException(msg, e);
    } catch (IOException e) {
        String msg = CommonResourceBundle.getInstance().getString("message.parseX509CertificateStreamFailed",
                new Object[] { e.getClass().getName(), e.getMessage() });
        throw new JAXRException(msg, e);
    } finally {
        try {
            inStream.close();
        } catch (IOException e) {
            inStream = null;
        }
    }
}

---

From source file:mitm.test.TestUtils.java

public static X509Certificate loadCertificate(String filename)
        throws CertificateException, NoSuchProviderException, FileNotFoundException {
    File file = new File(filename);

    Collection<? extends Certificate> certificates = CertificateUtils.readCertificates(file);

    if (certificates != null && certificates.size() > 0) {
        return (X509Certificate) certificates.iterator().next();
    }//from  w w w .ja  v  a2s .c o  m

    return null;
}

---

From source file:com.ebay.logstorm.server.utils.LogStormServerDebug.java

private static File findAssemblyJarFile() {
    String projectRootDir = System.getProperty("user.dir");
    String assemblyModuleTargeDirPath = projectRootDir + "/assembly/target/";
    File assemblyTargeDirFile = new File(assemblyModuleTargeDirPath);
    if (!assemblyTargeDirFile.exists()) {
        throw new IllegalStateException(
                assemblyModuleTargeDirPath + " not found, please execute 'mvn install -DskipTests' under "
                        + projectRootDir + " to build the project firstly and retry");
    }/*from   w  w  w  .j  a v a2 s.com*/
    String jarFileNameWildCard = "logstorm-assembly-*.jar";
    Collection<File> jarFiles = FileUtils.listFiles(assemblyTargeDirFile,
            new WildcardFileFilter(jarFileNameWildCard), TrueFileFilter.INSTANCE);
    if (jarFiles.size() == 0) {
        throw new IllegalStateException(
                "jar is not found, please execute 'mvn install -DskipTests' from project root firstly and retry");
    }
    File jarFile = jarFiles.iterator().next();
    LOG.debug("Found pipeline.jar: {}", jarFile.getAbsolutePath());
    return jarFile;
}

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From source file:com.liangc.hq.base.utils.MonitorUtils.java

/**
 * Sometimes, it's useful to just get a dump of all of the metrics 
 * returned by the backend./*from  w  w  w .j  ava2 s .com*/
 * 
 * @param log
 * @param metrics a Map keyed on the category (String), values are 
 * List's of MetricDisplaySummary beans
 */
public static void traceMetricDisplaySummaryMap(Log logger, Map metrics) {
    logger.trace("Dumping metric map (from " + MonitorUtils.class.getName() + "):");
    for (Iterator categoryIter = metrics.keySet().iterator(); categoryIter.hasNext();) {
        String categoryName = (String) categoryIter.next();
        logger.trace("Category: " + categoryName);
        int i = 0;
        Collection metricList = (Collection) metrics.get(categoryName);
        for (Iterator iter = metricList.iterator(); iter.hasNext();) {
            MetricDisplaySummary summaryBean = (MetricDisplaySummary) iter.next();
            ++i;
            logger.trace("\t " + i + ": " + summaryBean);
        }
    }
}

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From source file:grails.plugin.searchable.internal.util.GrailsDomainClassUtils.java

/**
 * Get the actual (user-defined) Classes for the given GrailsDomainClass Collection.
 * Equivalent to collecting the results of <code>grailsDomainClass.getClazz()</code> on
 * each element/*from   ww w .jav a2  s  .c o  m*/
 *
 * @param grailsDomainClasses
 * @return A collection of User-defined classes, which may be empty
 */
public static Collection getClazzes(Collection grailsDomainClasses) {
    if (grailsDomainClasses == null || grailsDomainClasses.isEmpty()) {
        return Collections.EMPTY_SET;
    }
    Set clazzes = new HashSet();
    for (Iterator iter = grailsDomainClasses.iterator(); iter.hasNext();) {
        clazzes.add(((GrailsDomainClass) iter.next()).getClazz());
    }
    return clazzes;
}

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From source file:org.codehaus.groovy.grails.plugins.searchable.compass.mapping.CompassMappingUtils.java

/**
 * Resolve aliases between mappings/*w ww . j  a v  a2 s. c  o m*/
 * Note this method is destructive in the sense that it modifies the passed in mappings
 */
public static void resolveAliases(List classMappings, Collection grailsDomainClasses) {
    // set defaults for those classes without explicit aliases and collect aliases
    Map mappingByClass = new HashMap();
    Map mappingsByAlias = new HashMap();
    for (Iterator iter = classMappings.iterator(); iter.hasNext();) {
        CompassClassMapping classMapping = (CompassClassMapping) iter.next();
        if (classMapping.getAlias() == null) {
            classMapping.setAlias(getDefaultAlias(classMapping.getMappedClass()));
        }
        mappingByClass.put(classMapping.getMappedClass(), classMapping);
        List mappings = (List) mappingsByAlias.get(classMapping.getAlias());
        if (mappings == null) {
            mappings = new ArrayList();
            mappingsByAlias.put(classMapping.getAlias(), mappings);
        }
        mappings.add(classMapping);
    }

    // override duplicate inherited aliases
    for (Iterator iter = mappingsByAlias.keySet().iterator(); iter.hasNext();) {
        List mappings = (List) mappingsByAlias.get(iter.next());
        if (mappings.size() == 1) {
            continue;
        }
        CompassClassMapping parentMapping = null;
        for (Iterator miter = mappings.iterator(); miter.hasNext();) {
            CompassClassMapping classMapping = (CompassClassMapping) miter.next();
            if (classMapping.getMappedClassSuperClass() == null) {
                parentMapping = classMapping;
                break;
            }
        }
        mappings.remove(parentMapping);
        for (Iterator miter = mappings.iterator(); miter.hasNext();) {
            CompassClassMapping classMapping = (CompassClassMapping) miter.next();
            LOG.debug("Overriding duplicated alias [" + classMapping.getAlias() + "] for class ["
                    + classMapping.getMappedClass().getName()
                    + "] with default alias. (Aliases must be unique - maybe this was inherited from a superclass?)");
            classMapping.setAlias(getDefaultAlias(classMapping.getMappedClass()));
        }
    }

    // resolve property ref aliases
    for (Iterator iter = classMappings.iterator(); iter.hasNext();) {
        CompassClassMapping classMapping = (CompassClassMapping) iter.next();
        Class mappedClass = classMapping.getMappedClass();
        for (Iterator piter = classMapping.getPropertyMappings().iterator(); piter.hasNext();) {
            CompassClassPropertyMapping propertyMapping = (CompassClassPropertyMapping) piter.next();
            if ((propertyMapping.isComponent() || propertyMapping.isReference())
                    && !propertyMapping.hasAttribute("refAlias")) {
                Set aliases = new HashSet();
                Class clazz = propertyMapping.getPropertyType();
                aliases.add(((CompassClassMapping) mappingByClass.get(clazz)).getAlias());
                GrailsDomainClassProperty domainClassProperty = GrailsDomainClassUtils
                        .getGrailsDomainClassProperty(grailsDomainClasses, mappedClass,
                                propertyMapping.getPropertyName());
                Collection clazzes = GrailsDomainClassUtils
                        .getClazzes(domainClassProperty.getReferencedDomainClass().getSubClasses());
                for (Iterator citer = clazzes.iterator(); citer.hasNext();) {
                    CompassClassMapping mapping = (CompassClassMapping) mappingByClass.get(citer.next());
                    if (mapping != null) {
                        aliases.add(mapping.getAlias());
                    }
                }
                propertyMapping.setAttrbute("refAlias", DefaultGroovyMethods.join(aliases, ", "));
            }
        }
    }

    // resolve extend aliases
    for (Iterator iter = classMappings.iterator(); iter.hasNext();) {
        CompassClassMapping classMapping = (CompassClassMapping) iter.next();
        Class mappedClassSuperClass = classMapping.getMappedClassSuperClass();
        if (mappedClassSuperClass != null && classMapping.getExtend() == null) {
            CompassClassMapping mapping = (CompassClassMapping) mappingByClass.get(mappedClassSuperClass);
            classMapping.setExtend(mapping.getAlias());
        }
    }
}

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From source file:com.centeractive.ws.builder.DefinitionSaveTest.java

public static File findFile(File folder, String name) {
    final boolean RECURSIVE = true;
    String[] extensions = new String[] { FilenameUtils.getExtension(name) };
    Collection<File> files = FileUtils.listFiles(folder, extensions, RECURSIVE);
    if (files.isEmpty() == false) {
        return files.iterator().next();
    }/*from ww  w.j av  a 2s .  c  om*/
    throw new RuntimeException("File not found " + name);
}

---

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