Example usage for java.util Objects requireNonNull

Introduction

In this page you can find the example usage for java.util Objects requireNonNull.

Prototype

public static <T> T requireNonNull(T obj, Supplier<String> messageSupplier)

Source Link

Document

Checks that the specified object reference is not null and throws a customized NullPointerException if it is.

Usage

From source file:Main.java

/**
 * Transform the source collection using the mapping function to convert the elements to the output type. The result
 * is written to a list.//from  w w  w.  ja va  2  s .  c  om
 *
 * @param <T>
 *            the source type type
 * @param <R>
 *            the result type
 * @param source
 *            the source
 * @param mapping
 *            the mapping used for the value transformation
 * @return the list
 */
public static <T, R> List<R> transformToList(Collection<T> source, Function<T, R> mapping) {
    Objects.requireNonNull(mapping, "Mapping functions is required!");
    if (isEmpty(source)) {
        return new LinkedList<>();
    }
    List<R> result = new LinkedList<>();
    for (T item : source) {
        result.add(mapping.apply(item));
    }
    return result;
}

From source file:Main.java

public static Element addChildElement(Node parent, String elementName) {
    Document ownerDocument = parent.getOwnerDocument();
    Objects.requireNonNull(ownerDocument, "nodes ownerDocument " + parent);
    Element element = ownerDocument.createElement(elementName);
    parent.appendChild(element);/*  ww  w .  ja  v  a 2  s. c  o m*/
    return element;
}

From source file:me.ferrybig.javacoding.webmapper.util.JsonArrayCollection.java

public JsonArrayCollection(JSONArray arr) {
    this.arr = Objects.requireNonNull(arr, "arr == null");
}

From source file:edu.usu.sdl.openstorefront.core.util.EntityUtil.java

/**
 * This will set default on the fields that are marked with a default and
 * are null//  w  w w . j ava  2  s  .c o m
 *
 * @param entity
 */
public static void setDefaultsOnFields(Object entity) {
    Objects.requireNonNull(entity, "Entity must not be NULL");
    List<Field> fields = getAllFields(entity.getClass());
    for (Field field : fields) {
        DefaultFieldValue defaultFieldValue = field.getAnnotation(DefaultFieldValue.class);
        if (defaultFieldValue != null) {
            field.setAccessible(true);
            try {
                if (field.get(entity) == null) {
                    String value = defaultFieldValue.value();
                    Class fieldClass = field.getType();
                    if (fieldClass.getSimpleName().equalsIgnoreCase(String.class.getSimpleName())) {
                        field.set(entity, value);
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(Long.class.getSimpleName())) {
                        field.set(entity, value);
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(Integer.class.getSimpleName())) {
                        field.set(entity, Integer.parseInt(value));
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(Boolean.class.getSimpleName())) {
                        field.set(entity, Convert.toBoolean(value));
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(Double.class.getSimpleName())) {
                        field.set(entity, Double.parseDouble(value));
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(Float.class.getSimpleName())) {
                        field.set(entity, Float.parseFloat(value));
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(BigDecimal.class.getSimpleName())) {
                        field.set(entity, Convert.toBigDecimal(value));
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(Date.class.getSimpleName())) {
                        field.set(entity, TimeUtil.fromString(value));
                    } else if (fieldClass.getSimpleName().equalsIgnoreCase(BigInteger.class.getSimpleName())) {
                        field.set(entity, new BigInteger(value));
                    }
                }
            } catch (IllegalArgumentException | IllegalAccessException ex) {
                throw new OpenStorefrontRuntimeException(
                        "Unable to get value on " + entity.getClass().getName(), "Check entity passed in.");
            }
        }
    }
}

From source file:com.conwet.silbops.model.basic.Type.java

/**
 * Deserialize from a JSON representation
 * /*from   w ww  . j av a  2 s .  co m*/
 * @param json JSON representation
 * @return A new value type
 * @throws IllegalArgumentException if the given string doesn't match any type.
 */
public static Type fromJSON(String json) {

    return Objects.requireNonNull(JSON_MAP.get(json), "Malformed object: " + json);
}

From source file:Main.java

/**
 * Converts the given iterator to collection created via the provided {@link Supplier}.
 * <p>/*from  w w  w.j av a  2  s  .  co  m*/
 * Example use: <code>List&lt;String&gt; list = CollectionUtils.toCollection(iterator, LinkedList::new);</code>
 *
 * @param <T>
 *            the generic type
 * @param <C>
 *            the generic type
 * @param iterator
 *            the iterator
 * @param newInstance
 *            the new instance
 * @return the c
 */
public static <T, C extends Collection<T>> C toCollection(Iterator<T> iterator, Supplier<C> newInstance) {
    Objects.requireNonNull(iterator, "The iterator is required");
    Objects.requireNonNull(newInstance, "New Instance supplier is required");

    C list = newInstance.get();
    iterator.forEachRemaining(list::add);
    return list;
}

From source file:io.apiman.gateway.platforms.vertx3.api.auth.KeycloakOAuthFactory.java

public static AuthHandler create(Vertx vertx, Router router, VertxEngineConfig apimanConfig,
        JsonObject authConfig) {//from  www .j a va  2  s.  c o  m
    OAuth2FlowType flowType = toEnum(authConfig.getString("flowType"));
    String role = authConfig.getString("requiredRole");

    Objects.requireNonNull(flowType, String.format("flowType must be specified and valid. Flows: %s.",
            Arrays.asList(OAuth2FlowType.values())));
    Objects.requireNonNull(role, "requiredRole must be non-null.");

    if (flowType != OAuth2FlowType.AUTH_CODE) {
        return directGrant(vertx, apimanConfig, authConfig, flowType, role);
    } else {
        return standardAuth(vertx, router, apimanConfig, authConfig, flowType);
    }
}

From source file:kishida.cnn.layers.ImageNeuralLayer.java

public void setPreLayer(NeuralLayer preLayer) {
    Objects.requireNonNull(preLayer, "need preLayer");
    if (!(preLayer instanceof ImageNeuralLayer)) {
        throw new IllegalArgumentException("Need ImageNeuralLayer instead of " + preLayer.getClass());
    }//from  www .  ja  v a 2s .c  o m
    this.preLayer = preLayer;
    ImageNeuralLayer imageLayer = (ImageNeuralLayer) preLayer;
    this.inputChannels = imageLayer.outputChannels;
    this.inputWidth = imageLayer.outputWidth;
    this.inputHeight = imageLayer.outputHeight;
}

From source file:com.fizzed.blaze.util.Streamables.java

static public StreamableInput input(InputStream stream, String name) {
    Objects.requireNonNull(stream, "stream cannot be null");
    return new StreamableInput(stream, (name != null ? name : "<stream"), null, null);
}

From source file:cn.edu.zjnu.acm.judge.config.FilterLocaleResolver.java

public FilterLocaleResolver(LocaleResolver parent, Locale defaultLocale, Predicate<Locale> predicate) {
    this.parent = Objects.requireNonNull(parent, "parent");
    this.defaultLocale = Objects.requireNonNull(defaultLocale, "defaultLocale");
    this.predicate = Objects.requireNonNull(predicate, "predicate");
}