Example usage for java.util Collections EMPTY

Introduction

In this page you can find the example usage for java.util Collections EMPTY_LIST.

Prototype

List EMPTY_LIST

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Document

The empty list (immutable).

Usage

From source file:be.fedict.hsm.admin.webapp.KeyStoreController.java

public List<CertificateView> getCertificates() {
    if (null == this.selectedKeyStoreAlias) {
        return Collections.EMPTY_LIST;
    }/*  ww w.  j  a v  a 2  s . c o  m*/
    List<X509Certificate> certificateChain = this.keyStoreManagerBean
            .getCertificateChain(this.selectedKeyStore.getId(), this.selectedKeyStoreAlias);
    LOG.debug("getCertificates: " + certificateChain.size());
    List<CertificateView> certificateChainView = new LinkedList<CertificateView>();
    for (X509Certificate certificate : certificateChain) {
        CertificateView certificateView = new CertificateView(certificate);
        certificateChainView.add(certificateView);
    }
    return certificateChainView;
}

From source file:com.dianping.cache.remote.jms.CacheMessageProducerAMQ.java

@SuppressWarnings("unchecked")
private List<String> getMailReceivers() {
    String receivers = null;// www  .j  a  v a  2 s .c om
    try {
        receivers = ConfigCache.getInstance().getProperty(CONFIG_KEY_ACTIVEMQ_ERRMAIL_RECEIVERS);
    } catch (Throwable e) {
        logger.warn("Get config[" + CONFIG_KEY_ACTIVEMQ_ERRMAIL_RECEIVERS + "] from lion failed.", e);
    }
    return StringUtils.isNotBlank(receivers) ? Arrays.asList(StringUtils.split(receivers, ","))
            : Collections.EMPTY_LIST;
}

From source file:com.heliosapm.opentsdb.client.jvmjmx.custom.aggregation.AggregateFunction.java

/**
 * Computes and returns the aggregate for the named aggregator and object of nput items.
 * The object is introspected to determine if it is:<ul>
 *  <li>Null</li>//from  www  .  j a v a2  s  . com
 *    <li>{@link java.util.Map}</li>
 *    <li>{@link java.util.Collection}</li>
 *    <li>An array</li>
 * </ul>.
 * If it is none of the above, a runtime exception is thrown.
 * If it is a map or an array, it is converted to a list for aggregate computation.
 * @param name The name of the aggregator function
 * @param item The object of items to aggregate
 * @return the aggregate value
 * TODO:  Do we need to support multi dimmensional arrays ?
 */
@SuppressWarnings("unchecked")
public static Object aggregate(CharSequence name, Object item) {
    final List<Object> items;
    final AggregateFunction function = AggregateFunction.forName(name);
    if (item == null) {
        items = Collections.EMPTY_LIST;
    } else if (item instanceof Map) {
        Map<Object, Object> map = (Map<Object, Object>) item;
        items = new ArrayList<Object>(map.keySet());
    } else if (item instanceof Collection) {
        items = new ArrayList<Object>((Collection<Object>) item);
    } else if (item.getClass().isArray()) {
        int length = Array.getLength(item);
        items = new ArrayList<Object>(length);
        for (int i = 0; i < length; i++) {
            items.add(i, Array.get(item, i));
        }
    } else {
        throw new IllegalArgumentException("Aggregate object of type [" + item.getClass().getName()
                + "] was not a Map, Collection or Array", new Throwable());
    }
    return function.aggregate(items);
}

From source file:com.creactiviti.piper.core.Coordinator.java

private void validate(MapObject aCreateJobParams, Pipeline aPipeline) {
    // validate inputs
    Map<String, Object> inputs = aCreateJobParams.getMap(DSL.INPUTS, Collections.EMPTY_MAP);
    List<Accessor> input = aPipeline.getInputs();
    for (Accessor in : input) {
        if (in.getBoolean(DSL.REQUIRED, false)) {
            Assert.isTrue(inputs.containsKey(in.get(DSL.NAME)), "Missing required param: " + in.get("name"));
        }/*from  w w  w  . j  a v a  2 s.c  om*/
    }
    // validate webhooks
    List<Accessor> webhooks = aCreateJobParams.getList(WEBHOOKS, MapObject.class, Collections.EMPTY_LIST);
    for (Accessor webhook : webhooks) {
        Assert.notNull(webhook.getString(DSL.TYPE), "must define 'type' on webhook");
        Assert.notNull(webhook.getString(DSL.URL), "must define 'url' on webhook");
    }
}

From source file:com.haulmont.cuba.gui.data.impl.EmbeddedDatasourceImpl.java

@Override
public Collection<T> getItemsToUpdate() {
    return Collections.EMPTY_LIST;
}

From source file:com.sun.faces.context.FacesContextImpl.java

public Iterator getMessages(String clientId) {
    assertNotReleased();// w w  w  .  j a va 2s  .  com
    // If no messages have been enqueued at all,
    // return an empty List Iterator
    if (null == componentMessageLists) {
        return (Collections.EMPTY_LIST.iterator());
    }

    List list = (List) componentMessageLists.get(clientId);
    if (list == null) {
        return (Collections.EMPTY_LIST.iterator());
    }
    return (list.iterator());
}

From source file:azkaban.project.FlowLoaderUtils.java

/**
 * Adds email properties to a flow./*from w  w  w.ja va2  s .co m*/
 *
 * @param flow the flow
 * @param prop the prop
 */
public static void addEmailPropsToFlow(final Flow flow, final Props prop) {
    final List<String> successEmailList = prop.getStringList(CommonJobProperties.SUCCESS_EMAILS,
            Collections.EMPTY_LIST);
    final Set<String> successEmail = new HashSet<>();
    for (final String email : successEmailList) {
        successEmail.add(email.toLowerCase());
    }

    final List<String> failureEmailList = prop.getStringList(CommonJobProperties.FAILURE_EMAILS,
            Collections.EMPTY_LIST);
    final Set<String> failureEmail = new HashSet<>();
    for (final String email : failureEmailList) {
        failureEmail.add(email.toLowerCase());
    }

    final List<String> notifyEmailList = prop.getStringList(CommonJobProperties.NOTIFY_EMAILS,
            Collections.EMPTY_LIST);
    for (String email : notifyEmailList) {
        email = email.toLowerCase();
        successEmail.add(email);
        failureEmail.add(email);
    }

    flow.addFailureEmails(failureEmail);
    flow.addSuccessEmails(successEmail);
}

From source file:org.miloss.fgsms.bueller.Bueller.java

/**
 * provides a wrapper for getting alternate urls without passing a db
 * connection/*from   w  w w.ja v  a2s.  c om*/
 *
 * @param url
 * @param pooled
 * @return
 */
protected static List<String> GetAlternateUrls(String url, boolean pooled) {
        
    java.sql.Connection perf = null;
    if (pooled) {
        perf = Utility.getPerformanceDBConnection();
    } else {
        perf = Utility.getPerformanceDB_NONPOOLED_Connection();
    }
    List<String> ret = Collections.EMPTY_LIST;
    try {
        ret = GetAlternateUrls(url, perf);
    } catch (Exception ex) {
        log.log(Level.ERROR, null, ex);
    } finally {
        DBUtils.safeClose(perf);
    }
    return ret;
}

From source file:com.haulmont.cuba.gui.data.impl.EmbeddedDatasourceImpl.java

@Override
public Collection<T> getItemsToDelete() {
    return Collections.EMPTY_LIST;
}

From source file:com.xpn.xwiki.XWikiTest.java

@Override
protected void setUp() throws Exception {
    super.setUp();

    this.document = new XWikiDocument(new DocumentReference("Wiki", "MilkyWay", "Fidis"));
    getContext().setRequest(new XWikiServletRequestStub());
    getContext().setURL(new URL("http://localhost:8080/xwiki/bin/view/MilkyWay/Fidis"));

    this.xwiki = new XWiki(new XWikiConfig(), getContext()) {
        protected void registerWikiMacros() {
        }/*from www  .  j  ava  2s .  c o  m*/

        // Avoid all the error at XWiki initialization
        @Override
        public String getXWikiPreference(String prefname, String defaultValue, XWikiContext context) {
            if (prefname.equals("plugins") || prefname.startsWith("macros_")) {
                return defaultValue;
            } else {
                return super.getXWikiPreference(prefname, defaultValue, context);
            }
        }
    };
    getContext().setWiki(this.xwiki);

    // Ensure that no Velocity Templates are going to be used when executing Velocity since otherwise
    // the Velocity init would fail (since by default the macros.vm templates wouldn't be found as we're
    // not providing it in our unit test resources).
    this.xwiki.getConfig().setProperty("xwiki.render.velocity.macrolist", "");

    this.mockXWikiStore = mock(XWikiHibernateStore.class, new Class[] { XWiki.class, XWikiContext.class },
            new Object[] { this.xwiki, getContext() });
    this.mockXWikiStore.stubs().method("loadXWikiDoc")
            .will(new CustomStub("Implements XWikiStoreInterface.loadXWikiDoc") {
                public Object invoke(Invocation invocation) throws Throwable {
                    XWikiDocument shallowDoc = (XWikiDocument) invocation.parameterValues.get(0);
                    if (XWikiTest.this.docs.containsKey(shallowDoc.getName())) {
                        return XWikiTest.this.docs.get(shallowDoc.getName());
                    } else {
                        return shallowDoc;
                    }
                }
            });
    this.mockXWikiStore.stubs().method("saveXWikiDoc")
            .will(new CustomStub("Implements XWikiStoreInterface.saveXWikiDoc") {
                public Object invoke(Invocation invocation) throws Throwable {
                    XWikiDocument document = (XWikiDocument) invocation.parameterValues.get(0);
                    document.setNew(false);
                    document.setStore((XWikiStoreInterface) XWikiTest.this.mockXWikiStore.proxy());
                    XWikiTest.this.docs.put(document.getName(), document);
                    return null;
                }
            });
    this.mockXWikiStore.stubs().method("deleteXWikiDoc")
            .will(new CustomStub("Implements XWikiStoreInterface.deleteXWikiDoc") {
                public Object invoke(Invocation invocation) throws Throwable {
                    XWikiDocument document = (XWikiDocument) invocation.parameterValues.get(0);
                    XWikiTest.this.docs.remove(document.getName());
                    return null;
                }
            });
    this.mockXWikiStore.stubs().method("getTranslationList").will(returnValue(Collections.EMPTY_LIST));
    this.mockXWikiStore.stubs().method("exists").will(returnValue(true));

    this.mockXWikiVersioningStore = mock(XWikiHibernateVersioningStore.class,
            new Class[] { XWiki.class, XWikiContext.class }, new Object[] { this.xwiki, getContext() });
    this.mockXWikiVersioningStore.stubs().method("getXWikiDocumentArchive").will(returnValue(null));
    this.mockXWikiVersioningStore.stubs().method("resetRCSArchive").will(returnValue(null));

    this.xwiki.setStore((XWikiStoreInterface) this.mockXWikiStore.proxy());
    this.xwiki.setVersioningStore((XWikiVersioningStoreInterface) this.mockXWikiVersioningStore.proxy());
    this.xwiki.saveDocument(this.document, getContext());

    this.document.setCreator("Condor");
    this.document.setAuthor("Albatross");

    this.xwiki.saveDocument(this.document, getContext());
}

Example usage for java.util Collections EMPTY_LIST

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