Example usage for java.lang Class cast

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:com.ery.ertc.estorm.util.JVM.java

/**
 * Load the implementation of UnixOperatingSystemMXBean for Oracle jvm and runs the desired method.
 * //from  w w w  . java2 s . c o  m
 * @param mBeanMethodName
 *            : method to run from the interface UnixOperatingSystemMXBean
 * @return the method result
 */
private Long runUnixMXBeanMethod(String mBeanMethodName) {
    Object unixos;
    Class<?> classRef;
    Method mBeanMethod;

    try {
        classRef = Class.forName("com.sun.management.UnixOperatingSystemMXBean");
        if (classRef.isInstance(osMbean)) {
            mBeanMethod = classRef.getMethod(mBeanMethodName, new Class[0]);
            unixos = classRef.cast(osMbean);
            return (Long) mBeanMethod.invoke(unixos);
        }
    } catch (Exception e) {
        LOG.warn("Not able to load class or method for" + " com.sun.management.UnixOperatingSystemMXBean.", e);
    }
    return null;
}

From source file:ch.digitalfondue.npjt.QueryType.java

@SuppressWarnings("unchecked")
private static <T> AffectedRowCountAndKey<T> executeUpdateAndKeepKeys(String template, Method method,
        NamedParameterJdbcTemplate jdbc, SqlParameterSource parameters) {

    Class<T> keyClass = (Class<T>) ((ParameterizedType) method.getGenericReturnType())
            .getActualTypeArguments()[0];

    KeyHolder keyHolder = new GeneratedKeyHolder();

    int result = jdbc.update(template, parameters, keyHolder);
    Map<String, Object> keys = keyHolder.getKeys();
    Object key;//from  ww  w  . ja  va2 s  .c o m
    if (keys.size() > 1) {
        AutoGeneratedKey spec = Objects.requireNonNull(method.getDeclaredAnnotation(AutoGeneratedKey.class),
                "more than one key for query " + template + ": annotation @AutoGeneratedKey required");
        key = Objects.requireNonNull(keys.get(spec.value()), "the key with name " + spec.value()
                + " has returned null for query " + template + ": required a non null key");
    } else if (Number.class.isAssignableFrom(keyClass)) {
        Class<? extends Number> c = (Class<? extends Number>) keyClass;
        return new AffectedRowCountAndKey<>(result,
                (T) NumberUtils.convertNumberToTargetClass(keyHolder.getKey(), c));
    } else {
        key = keys.values().iterator().next();
    }
    return new AffectedRowCountAndKey<>(result, keyClass.cast(key));
}

From source file:com.funambol.json.coredb.CoreDBServlet.java

private <T> T getAttribute(String attributeName, HttpServletRequest request, Class<T> clazz) {
    if (request != null && clazz != null) {
        Object attribute = request.getAttribute(attributeName);
        if (attribute != null && clazz.isAssignableFrom(attribute.getClass())) {
            return clazz.cast(attribute);
        }//from w  w  w  .j  ava 2 s  . c  om
    }

    return null;

}

From source file:org.fcrepo.camel.karaf.KarafIT.java

private <T> T getOsgiService(final Class<T> type, final String filter, final long timeout) {
    try {// w  ww  . j  a  v a 2 s  .co m
        final ServiceTracker tracker = new ServiceTracker(bundleContext,
                createFilter("(&(" + OBJECTCLASS + "=" + type.getName() + ")" + filter + ")"), null);
        tracker.open(true);
        final Object svc = type.cast(tracker.waitForService(timeout));
        if (svc == null) {
            throw new RuntimeException("Gave up waiting for service " + filter);
        }
        return type.cast(svc);
    } catch (InvalidSyntaxException e) {
        throw new IllegalArgumentException("Invalid filter", e);
    } catch (InterruptedException e) {
        throw new RuntimeException(e);
    }
}

From source file:im.r_c.android.fusioncache.FusionCache.java

/**
 * Get value from disk cache./*from w  w  w . j  a  v a  2 s.co m*/
 * <p>
 * Only called when {@link #mDiskCache} is not null.
 */
private <T> T getFromDiskLocked(String key, Class<T> clz) {
    // Already know mDiskCache != null here
    if (clz == String.class) {
        return clz.cast(mDiskCache.getString(key));
    } else if (clz == JSONObject.class) {
        return clz.cast(mDiskCache.getJSONObject(key));
    } else if (clz == JSONArray.class) {
        return clz.cast(mDiskCache.getJSONArray(key));
    } else if (clz == byte[].class) {
        return clz.cast(mDiskCache.getBytes(key));
    } else if (clz == Bitmap.class) {
        return clz.cast(mDiskCache.getBitmap(key));
    } else if (clz == Drawable.class) {
        Context context = mAppContextRef.get();
        if (context != null) {
            return clz.cast(mDiskCache.getDrawable(key, context.getResources()));
        } else {
            return clz.cast(mDiskCache.getDrawable(key));
        }
    } else if (clz == Serializable.class) {
        return clz.cast(mDiskCache.getSerializable(key));
    }
    return null;
}

From source file:Main.java

public static <T extends Object, Result> Result callMethodCast(T receiver, Class<Result> resultClass,
        String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException,
        InvocationTargetException, InstantiationException {
    if (receiver == null || methodName == null) {
        return null;
    }//from   ww w. jav  a2 s .c om
    Class<?> cls = receiver.getClass();
    Method toInvoke = null;
    do {
        Method[] methods = cls.getDeclaredMethods();
        methodLoop: for (Method method : methods) {
            if (!methodName.equals(method.getName())) {
                continue;
            }
            Class<?>[] paramTypes = method.getParameterTypes();
            if (args == null && paramTypes == null) {
                toInvoke = method;
                break;
            } else if (args == null || paramTypes == null || paramTypes.length != args.length) {
                continue;
            }

            for (int i = 0; i < args.length; ++i) {
                if (!paramTypes[i].isAssignableFrom(args[i].getClass())) {
                    continue methodLoop;
                }
            }
            toInvoke = method;
        }
    } while (toInvoke == null && (cls = cls.getSuperclass()) != null);
    Result t;
    if (toInvoke != null) {
        boolean accessible = toInvoke.isAccessible();
        toInvoke.setAccessible(true);
        if (resultClass != null) {
            t = resultClass.cast(toInvoke.invoke(receiver, args));
        } else {
            toInvoke.invoke(receiver, args);
            t = null;
        }
        toInvoke.setAccessible(accessible);
        return t;
    } else {
        throw new NoSuchMethodException("Method " + methodName + " not found");
    }
}

From source file:edu.wisc.commons.httpclient.HttpParamsBean.java

private <T> T getTypedParameter(String name, T defaultValue, Class<T> type, Function<Object, T> parser) {
    final Object value = delegate.getParameter(name);

    //If null return default value
    if (value == null) {
        return defaultValue;
    }/*from w  ww  .  jav  a 2  s . c o  m*/

    //If already the right type just cast and return
    final Class<? extends Object> valueType = value.getClass();
    if (type.isAssignableFrom(valueType)) {
        return type.cast(value);
    }

    //Try parsing the value to the desired type
    try {
        return parser.apply(value);
    } catch (Exception e) {
        final ClassCastException cce = new ClassCastException(
                "Cannot convert '" + value + "' of type " + valueType.getName() + " to " + type.getName());
        cce.initCause(e);
        throw cce;
    }
}

From source file:com.redhat.ipaas.api.v1.rest.DataManager.java

public void addToCache(ModelData modelData) {
    try {//www  .j a v  a 2s  . co  m
        Class<? extends WithId> clazz;
        clazz = getClass(modelData.getKind());
        Cache<String, WithId> cache = caches.getCache(modelData.getKind().toLowerCase());

        LOGGER.debug(modelData.getKind() + ":" + modelData.getData());
        WithId entity = clazz.cast(mapper.readValue(modelData.getData(), clazz));
        Optional<String> id = entity.getId();
        String idVal;
        if (!id.isPresent()) {
            idVal = generatePK(cache);
            entity = entity.withId(idVal);
        } else {
            idVal = id.get();
        }
        cache.put(idVal, entity);
    } catch (Exception e) {
        IPaasServerException.launderThrowable(e);
    }
}

From source file:com.heliosapm.tsdblite.handlers.websock.WebSocketRequest.java

/**
 * Returns the value for the specified name
 * @param name The map key/*from  ww  w .  j av a  2s. c  o m*/
 * @param type The expected type of the value
 * @return The value
 */
public <T> T getValue(final String name, final Class<T> type) {
    if (name == null || name.trim().isEmpty())
        throw new IllegalArgumentException("The passed name was null or empty");
    if (type == null)
        throw new IllegalArgumentException("The passed type was null");
    final Object o = map.get(name.trim());
    return o == null ? null : type.cast(o);
}

From source file:com.medallia.tiny.ObjectProvider.java

/**
 * Get an object by annotation//from  w  w w.j a v a  2 s .com
 */
@SuppressWarnings("unchecked")
public <X> X getByAnnotation(Class<? extends Annotation> annotation, Class<X> c) {
    Object o = annotationMap.get(annotation);
    if (o == null)
        LOG.warn("No object for annotation " + annotation + " in " + this);

    //      We do a safe cast if possible here, since we do not know what type of object was used when registering
    return c.isPrimitive() ? (X) o : c.cast(o);
}