Example usage for java.lang Class cast

List of usage examples for java.lang Class cast

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Introduction

In this page you can find the example usage for java.lang Class cast.

Prototype

@SuppressWarnings("unchecked")
@HotSpotIntrinsicCandidate
public T cast(Object obj)

Source Link

Document

Casts an object to the class or interface represented by this Class object.

Usage

From source file:org.apache.metron.dataloads.taxii.TaxiiHandler.java

public static <RESPONSE_T, REQUEST_T> RESPONSE_T call(HttpClient taxiiClient, URI endpoint, REQUEST_T request,
        HttpClientContext context, Class<RESPONSE_T> responseClazz) throws JAXBException, IOException {
    //TaxiiXml taxiiXml = xmlFactory.get().createTaxiiXml();
    //String req = taxiiXml.marshalToString(request, true);
    // Call the service
    Object responseObj = taxiiClient.callTaxiiService(endpoint, request, context);
    LOG.info("Request made : " + request.getClass().getCanonicalName() + " => "
            + responseObj.getClass().getCanonicalName() + " (expected " + responseClazz.getCanonicalName()
            + ")");
    //String resp = taxiiXml.marshalToString(responseObj, true);
    try {/*  w w  w . j a  va  2 s . co  m*/
        return responseClazz.cast(responseObj);
    } catch (ClassCastException cce) {
        TaxiiXml taxiiXml = xmlFactory.get().createTaxiiXml();
        String resp = taxiiXml.marshalToString(responseObj, true);
        String msg = "Didn't return the response we expected: " + responseObj.getClass() + " \n" + resp;
        LOG.error(msg, cce);
        throw new RuntimeException(msg, cce);
    }
}

From source file:demo.config.PropertyConverter.java

/**
 * Convert the specified value into a Java 5 enum.
 * /*  w w  w .  j  a v a  2 s  .  c o m*/
 * @param value
 *            the value to convert
 * @param cls
 *            the type of the enumeration
 * @return the converted value
 * @throws ConversionException
 *             thrown if the value cannot be converted to an enumeration
 * 
 * @since 1.5
 */
static <E extends Enum<E>> E toEnum(Object value, Class<E> cls) throws ConversionException {
    if (value.getClass().equals(cls)) {
        return cls.cast(value);
    } else if (value instanceof String) {
        try {
            return Enum.valueOf(cls, (String) value);
        } catch (Exception e) {
            throw new ConversionException("The value " + value + " can't be converted to a " + cls.getName());
        }
    } else if (value instanceof Number) {
        try {
            E[] enumConstants = cls.getEnumConstants();
            return enumConstants[((Number) value).intValue()];
        } catch (Exception e) {
            throw new ConversionException("The value " + value + " can't be converted to a " + cls.getName());
        }
    } else {
        throw new ConversionException("The value " + value + " can't be converted to a " + cls.getName());
    }
}

From source file:jp.ikedam.jenkins.plugins.jobcopy_builder.JobcopyBuilder.java

/**
 * Reimplementation of {@link Jenkins#getItem(String, ItemGroup, Class)}
 * //from  w w w  .  ja v  a2  s .c o m
 * Existing implementation has following problems:
 * * Falls back to {@link Jenkins#getItemByFullName(String)}
 * * Cannot get {@link ItemGroup}
 * 
 * @param pathName
 * @param context
 * @param klass
 * @return
 */
public static <T> T getRelative(String pathName, ItemGroup<?> context, Class<T> klass) {
    if (context == null) {
        context = Jenkins.getInstance().getItemGroup();
    }
    if (pathName == null) {
        return null;
    }

    if (pathName.startsWith("/")) {
        // absolute
        Item item = Jenkins.getInstance().getItemByFullName(pathName);
        return klass.isInstance(item) ? klass.cast(item) : null;
    }

    Object/*Item|ItemGroup*/ ctx = context;

    StringTokenizer tokens = new StringTokenizer(pathName, "/");
    while (tokens.hasMoreTokens()) {
        String s = tokens.nextToken();
        if (s.equals("..")) {
            if (!(ctx instanceof Item)) {
                // can't go up further
                return null;
            }
            ctx = ((Item) ctx).getParent();
            continue;
        }
        if (s.equals(".")) {
            continue;
        }

        if (!(ctx instanceof ItemGroup)) {
            return null;
        }
        ItemGroup<?> g = (ItemGroup<?>) ctx;
        Item i = g.getItem(s);
        if (i == null || !i.hasPermission(Item.READ)) {
            return null;
        }
        ctx = i;
    }

    return klass.isInstance(ctx) ? klass.cast(ctx) : null;
}

From source file:com.flexive.faces.FxJsfUtils.java

/**
 * Returns the managed beans of the given class. Works only for flexive beans that
 * have the full class name and a "fx" prefix by convention. For example,
 * the ContentEditorBean is registered with JSF as "fxContentEditorBean".
 *
 * @param beanClass the beans class/*  w  ww .j a v  a 2 s .  c  o  m*/
 * @return the managed beans of the given class, or null if none exists
 */
public static <T> T getManagedBean(Class<T> beanClass) {
    return beanClass.cast(getManagedBean("fx" + beanClass.getSimpleName()));
}

From source file:com.dicksoft.ocr.xml.Parser.java

/**
 * Download and parse the specified data set.
 * /* ww w.  j  av  a 2s.  c  o  m*/
 * @param <T>
 * @param clazz
 *            the Class of the type to be parsed
 * @param elements
 *            the set of elements to add parsed data to
 * @throws NotParseableException
 *             if the contract of Parseable is breached
 */
public static <T extends Parseable> void parse(Class<T> clazz, Set<T> elements) throws NotParseableException {
    int numElements = 0;
    try {
        numElements = parseSize(
                (String) clazz.getMethod(Parseable.LIST_URL_METHOD, new Class[0]).invoke(null, new Object[0]));
        for (int i = 0; i < numElements; i++) {
            String xml = null;
            try {
                xml = HttpUtil.fetchText(
                        (String) clazz.getMethod(Parseable.ELEMENT_URL_METHOD, new Class[] { Integer.TYPE })
                                .invoke(null, new Object[] { i }));
            } catch (IOException e) {
                LOG.debug("Composer with ID " + i + "was not found.");
                continue;
            }
            elements.add(clazz.cast(
                    clazz.getMethod("parse", new Class[] { String.class }).invoke(null, new Object[] { xml })));
        }
    } catch (IllegalArgumentException e) {
        throw new NotParseableException(e);
    } catch (SecurityException e) {
        throw new NotParseableException(e);
    } catch (IllegalAccessException e) {
        throw new NotParseableException(e);
    } catch (InvocationTargetException e) {
        throw new NotParseableException(e);
    } catch (NoSuchMethodException e) {
        throw new NotParseableException(e);
    }
}

From source file:com.flexive.shared.EJBLookup.java

/**
 * Lookup the EJB found under the given Class's name. Uses default flexive naming scheme.
 *
 * @param type        EJB interface class instance
 * @param appName     EJB application name
 * @param environment optional environment for creating the initial context
 * @param <T>         EJB interface type
 * @return a reference to the given EJB//from  www .  j  a  v  a  2 s . c  o  m
 */
protected static <T> T getInterface(Class<T> type, String appName, Hashtable<String, String> environment) {
    // Try to obtain interface from the lookup cache
    Object ointerface = ejbCache.get(type.getName());
    if (ointerface != null) {
        return type.cast(ointerface);
    }

    // Cache miss: obtain interface and store it in the cache
    Hashtable<String, String> env;
    synchronized (EJBLookup.class) {
        String name;
        InitialContext ctx = null;
        env = new Hashtable<String, String>(10);
        try {
            if (environment != null)
                env.putAll(environment);
            if (used_strategy == null) {
                appName = discoverStrategy(appName, env, type);
                if (used_strategy != null) {
                    LOG.info("Working lookup strategy: " + used_strategy);
                } else {
                    LOG.error("No working lookup strategy found! Possibly because of pending redeployment.");
                }
            }
            prepareEnvironment(used_strategy, env);
            ctx = new InitialContext(env);
            name = buildName(appName, type);
            ointerface = ctx.lookup(name);
            ejbCache.putIfAbsent(type.getName(), ointerface);

            return type.cast(ointerface);
        } catch (Exception exc) {
            //try one more time with a strategy rediscovery for that bean
            //this can happen if some beans use mapped names and some not
            used_strategy = null;
            try {
                env.clear();
                if (environment != null)
                    env.putAll(environment);
                appName = discoverStrategy(appName, env, type);
                if (used_strategy != null) {
                    prepareEnvironment(used_strategy, env);
                    ctx = new InitialContext(env);
                    name = buildName(appName, type);
                    ointerface = ctx.lookup(name);
                    ejbCache.putIfAbsent(type.getName(), ointerface);
                    return type.cast(ointerface);
                }
            } catch (Exception e) {
                LOG.warn("Attempt to rediscover lookup strategy for " + type + " failed!", e);
            }
            throw new FxLookupException(LOG, exc, "ex.ejb.lookup.failure", type, exc).asRuntimeException();
        } finally {
            if (ctx != null)
                try {
                    ctx.close();
                } catch (NamingException e) {
                    LOG.error("Failed to close context: " + e.getMessage(), e);
                }
        }
    }
}

From source file:com.chiorichan.plugin.loader.Plugin.java

/**
 * This method provides fast access to the plugin that has {@link #getProvidingPlugin(Class) provided} the given plugin class, which is
 * usually the plugin that implemented it.
 * <p>//from   w  w w. j  a v a 2 s  .  co  m
 * An exception to this would be if plugin's jar that contained the class does not extend the class, where the intended plugin would have resided in a different jar / classloader.
 * 
 * @param clazz
 *            the class desired
 * @return the plugin that provides and implements said class
 * @throws IllegalArgumentException
 *             if clazz is null
 * @throws IllegalArgumentException
 *             if clazz does not extend {@link Plugin}
 * @throws IllegalStateException
 *             if clazz was not provided by a plugin,
 *             for example, if called with <code>Plugin.getPlugin(Plugin.class)</code>
 * @throws IllegalStateException
 *             if called from the static initializer for
 *             given Plugin
 * @throws ClassCastException
 *             if plugin that provided the class does not
 *             extend the class
 */
public static <T extends Plugin> T getPlugin(Class<T> clazz) {
    Validate.notNull(clazz, "Null class cannot have a plugin");
    if (!Plugin.class.isAssignableFrom(clazz)) {
        throw new IllegalArgumentException(clazz + " does not extend " + Plugin.class);
    }
    final ClassLoader cl = clazz.getClassLoader();
    if (!(cl instanceof PluginClassLoader)) {
        throw new IllegalArgumentException(clazz + " is not initialized by " + PluginClassLoader.class);
    }
    Plugin plugin = ((PluginClassLoader) cl).plugin;
    if (plugin == null) {
        throw new IllegalStateException("Cannot get plugin for " + clazz + " from a static initializer");
    }
    return clazz.cast(plugin);
}

From source file:gov.nih.nci.system.web.util.RESTUtil.java

public static String getLinkIdValue(Element rootElement, String linkName, String targetClassName,
        String targetClassIdName, String base64encodedUsernameAndPassword)
        throws gov.nih.nci.system.client.util.xml.XMLUtilityException {
    log.debug("linkName " + linkName);
    log.debug("targetClassName " + targetClassName);
    if (rootElement == null)
        return null;
    String idValue = null;/* w w w.java 2  s  .c  o  m*/

    try {
        Element element = rootElement;

        List children = element.getChildren();
        if (children == null || children.size() == 0)
            return null;

        Iterator iter = children.iterator();
        while (iter.hasNext()) {
            Element child = (Element) iter.next();
            log.debug("child.getName(): " + child.getName());
            if (child.getName().equals("link")) {
                String refName = child.getAttributeValue("ref");
                log.debug("refName: " + refName);
                log.debug("linkName: " + linkName);
                if (linkName != null && refName.trim().equals(linkName.trim())) {
                    log.debug("Equallllllll");
                    String href = child.getAttributeValue("href");
                    log.debug("href " + href);
                    String resourceStr = href.substring(href.indexOf("/rest/") + 6, href.length());
                    boolean isCollection = false;
                    if (resourceStr.indexOf("/") != resourceStr.lastIndexOf("/"))
                        isCollection = true;
                    log.debug("isCollection " + isCollection);

                    if (isCollection) {
                        Object results = queryLink(targetClassName, href, base64encodedUsernameAndPassword);
                        log.debug("results " + results);
                        if (results == null)
                            return "";
                        Collection collecton = (Collection) results;
                        Iterator iterator = collecton.iterator();
                        StringBuffer ids = new StringBuffer();
                        while (iterator.hasNext()) {
                            Object resultObj = iterator.next();
                            Class klass = Class.forName(targetClassName);
                            Object targetObject = klass.cast(resultObj);
                            String getIdMethod = "get" + ((targetClassIdName.charAt(0) + "").toUpperCase())
                                    + targetClassIdName.substring(1, targetClassIdName.length());
                            Method method = klass.getMethod(getIdMethod);
                            Object id = method.invoke(targetObject, null);
                            log.debug("id " + id);
                            ids.append(id.toString());
                            if (iterator.hasNext())
                                ids.append(",");

                        }
                        return ids.toString();
                    } else {
                        Object results = queryLink(targetClassName, href, base64encodedUsernameAndPassword);
                        log.debug("results " + results);
                        Class klass = Class.forName(targetClassName);
                        Object targetObject = klass.cast(results);
                        String getIdMethod = "get" + ((targetClassIdName.charAt(0) + "").toUpperCase())
                                + targetClassIdName.substring(1, targetClassIdName.length());
                        Method method = klass.getMethod(getIdMethod);
                        Object id = method.invoke(targetObject, null);
                        return id.toString();

                    }
                }
            }

        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    log.debug("idValue: " + idValue);
    return idValue;
}

From source file:com.databasepreservation.visualization.utils.SolrUtils.java

private static <T> T solrDocumentTo(Class<T> resultClass, SolrDocument doc) throws GenericException {
    T ret = null;//from   ww  w .j  av a 2s.  co  m
    try {
        if (resultClass.equals(ViewerDatabase.class)) {
            ret = resultClass.cast(SolrTransformer.toDatabase(doc));
        } else if (resultClass.equals(ViewerRow.class)) {
            ret = resultClass.cast(SolrTransformer.toRow(doc));
        } else if (resultClass.equals(SavedSearch.class)) {
            ret = resultClass.cast(SolrTransformer.toSavedSearch(doc));
        } else {
            throw new GenericException("Cannot find class index name: " + resultClass.getName());
        }
    } catch (ViewerException e) {
        throw new GenericException("Cannot retrieve " + resultClass.getName(), e);
    }

    // if (resultClass.equals(IndexedAIP.class)) {
    // ret = resultClass.cast(solrDocumentToIndexAIP(doc));
    // } else if (resultClass.equals(IndexedRepresentation.class) ||
    // resultClass.equals(Representation.class)) {
    // ret = resultClass.cast(solrDocumentToRepresentation(doc));
    // } else {
    // throw new GenericException("Cannot find class index name: " +
    // resultClass.getName());
    // }
    return ret;
}

From source file:com.hihsoft.baseclass.web.controller.BaseController.java

public static <T> T getOrCreateRequestAttribute(HttpServletRequest request, String key, Class<T> clazz) {
    Object value = request.getAttribute(key);
    if (value == null) {
        try {//from  w  w  w  . j a v a 2  s .  c  om
            value = clazz.newInstance();
        } catch (Exception e) {
            ReflectionUtils.handleReflectionException(e);
        }
        request.setAttribute(key, value);
    }
    return clazz.cast(value);
}