本文整理了Java中org.opencastproject.util.data.Option类的一些代码示例，展示了Option类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Option类的具体详情如下：
包路径：org.opencastproject.util.data.Option
类名称：Option

Option介绍

[英]The option type encapsulates on optional value. It contains either some value or is empty. Please make sure to NEVER wrap null into a some. Instead use none.
[中]选项类型封装在可选值上。它要么包含某个值，要么为空。请确保不要将空值包装到some中。取而代之的是不使用。

代码示例

代码示例来源：origin: opencast/opencast

/** Wrap an arbitrary object into an option with <code>null</code> being mapped to none. */
public static <A> Option<A> option(A a) {
 if (a != null)
  return some(a);
 else
  return none();
}

代码示例来源：origin: opencast/opencast

@Override
public Option<Date[]> getTemporalPeriod() {
 if (temporalOpt.isSome()) {
  if (temporalOpt.get() instanceof DCMIPeriod) {
   DCMIPeriod p = (DCMIPeriod) temporalOpt.get();
   return option(new Date[] { p.getStart(), p.getEnd() });
  }
 }
 return Option.none();
}

代码示例来源：origin: opencast/opencast

/**
 * OSGI activate method.
 *
 * @param cc
 *          OSGI component context
 **/
public void activate(ComponentContext cc) {
 acceptJobLoadsExeedingMaxLoad = getOptContextProperty(cc, ACCEPT_JOB_LOADS_EXCEEDING_PROPERTY).map(Strings.toBool)
     .getOrElse(DEFAULT_ACCEPT_JOB_LOADS_EXCEEDING);
}

代码示例来源：origin: opencast/opencast

@Override
public Option<Long> getTemporalDuration() {
 if (temporalOpt.isSome()) {
  if (temporalOpt.get() instanceof Long) {
   return temporalOpt;
  }
 }
 return Option.none();
}

代码示例来源：origin: opencast/opencast

/** If this is some return <code>some</code>. Like {@link #map(Function)} but ignores the option's content. */
public <B> Option<B> andThenV(B some) {
 return isSome() ? some(some) : Option.<B> none();
}

代码示例来源：origin: opencast/opencast

public <B> Option<Tuple<A, B>> and(Option<B> b) {
 if (isSome() && b.isSome()) {
  return some(tuple(get(), b.get()));
 } else {
  return none();
 }
}

代码示例来源：origin: opencast/opencast

@Override
 public Option<A> apply(A a) {
  return option(a);
 }
};

代码示例来源：origin: opencast/opencast

/** Evaluate the xpath expression against the contained document. The expression must return a nodelist. */
// todo replace return type with Valid once it is implemented
public Option<NodeList> nodeSet(String expr) {
 try {
  return option(((NodeList) xpath.evaluate(expr, node, XPathConstants.NODESET)));
 } catch (XPathExpressionException e) {
  return none();
 }
}

代码示例来源：origin: opencast/opencast

/** OSGi callback */
public void activate(ComponentContext cc) {
 host = option(getContextProperty(cc, OpencastConstants.SERVER_URL_PROPERTY)).bind(Strings.trimToNone).getOrElse(
     UrlSupport.DEFAULT_BASE_URL);
 for (BundleInfoDb a : db)
  a.clear(host);
 cc.getBundleContext().addBundleListener(this);
 for (Bundle b : cc.getBundleContext().getBundles()) {
  logBundle(b);
 }
}

代码示例来源：origin: opencast/opencast

/** If this is some return <code>some</code>. Like {@link #bind(Function)} but ignores the option's content. */
public <B> Option<B> andThen(Option<B> some) {
 return isSome() ? some : Option.<B> none();
}

代码示例来源：origin: opencast/opencast

/**
 * Get an optional boolean from a dictionary.
 */
public static Option<Boolean> getOptCfgAsBoolean(Dictionary d, String key) {
 return option(d.get(key)).bind(Strings.asString()).map(Strings.toBool);
}

代码示例来源：origin: opencast/opencast

/**
 * Return the endpoint's server URL and the service path by extracting the relevant parameters from the
 * ComponentContext.
 *
 * @param cc
 *          ComponentContext to get configuration from
 * @param serverUrlKey
 *          Configuration key for the server URL
 * @param servicePathKey
 *          Configuration key for the service path
 * @return (serverUrl, servicePath)
 * @throws Error
 *           if the service path is not configured for this component
 */
public static Tuple<String, String> getEndpointUrl(ComponentContext cc, String serverUrlKey, String servicePathKey) {
 final String serverUrl = option(cc.getBundleContext().getProperty(serverUrlKey)).getOrElse(
     UrlSupport.DEFAULT_BASE_URL);
 final String servicePath = option((String) cc.getProperties().get(servicePathKey)).getOrElse(
     Option.<String> error(RestConstants.SERVICE_PATH_PROPERTY + " property not configured"));
 return tuple(serverUrl, servicePath);
}

代码示例来源：origin: opencast/opencast

@Override public String getPrefix(final String uri) {
 return option(b.getPrefix(uri)).getOrElse(new Function0<String>() {
  @Override public String apply() {
   return a.getPrefix(uri);
  }
 });
}

代码示例来源：origin: opencast/opencast

/**
 * Get an optional, non-blank value from the <em>bundle</em> context.
 *
 * @throws RuntimeException
 *           key does not exist or its value is blank
 */
public static Option<String> getOptContextProperty(ComponentContext cc, String key) {
 return option(cc.getBundleContext().getProperty(key)).bind(Strings.trimToNone);
}

代码示例来源：origin: opencast/opencast

/**
 * OSGI callback for activating this component
 *
 * @param cc
 *          the osgi component context
 */
public void activate(ComponentContext cc) throws ConfigurationException {
 logger.info("Static File REST Service started.");
 serverUrl = OsgiUtil.getContextProperty(cc, OpencastConstants.SERVER_URL_PROPERTY);
 useWebserver = BooleanUtils.toBoolean(OsgiUtil.getOptCfg(cc.getProperties(), STATICFILES_WEBSERVER_ENABLED_KEY)
     .getOrElse("false"));
 webserverURL = OsgiUtil.getOptCfg(cc.getProperties(), STATICFILES_WEBSERVER_URL_KEY);
 Option<String> cfgMaxUploadSize = OsgiUtil.getOptContextProperty(cc, STATICFILES_UPLOAD_MAX_SIZE_KEY);
 if (cfgMaxUploadSize.isSome())
  maxUploadSize = Long.parseLong(cfgMaxUploadSize.get());
}

代码示例来源：origin: opencast/opencast

/**
 * {@inheritDoc}
 *
 * @see org.opencastproject.workingfilerepository.api.WorkingFileRepository#getTotalSpace()
 */
public Option<Long> getTotalSpace() {
 File f = new File(rootDirectory);
 return Option.some(f.getTotalSpace());
}

代码示例来源：origin: opencast/opencast

@Override
public boolean equals(Object o) {
 if (o instanceof Option) {
  Option<?> opt = (Option<?>) o;
  // since an Option should NEVER contain any null this is safe
  return opt.isSome() && a.equals(opt.get());
 } else {
  return false;
 }
}

代码示例来源：origin: opencast/opencast

/**
 * Basic sanity checking for media packages.
 *
 * <pre>
 * // media package is ok
 * sanityCheck(mp).isNone()
 * </pre>
 *
 * @return none if the media package is a healthy condition, some([error_msgs]) otherwise
 */
public static Option<List<String>> sanityCheck(MediaPackage mp) {
 final Option<List<String>> errors = sequenceOpt(list(toOption(mp.getIdentifier() != null, "no ID"),
     toOption(mp.getIdentifier() != null && isNotBlank(mp.getIdentifier().toString()), "blank ID")));
 return errors.getOrElse(NIL).size() == 0 ? Option.<List<String>> none() : errors;
}

代码示例来源：origin: opencast/opencast

@Override
 public A apply(Option<A> ao) {
  return ao.getOrElse(a);
 }
};

代码示例来源：origin: opencast/opencast

@Override
 public Option<String> apply(MediaPackageElement mediaPackageElement) {
  return option(mediaPackageElement.getReference()).map(getReferenceId);
 }
};