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:org.opencb.commons.datastore.core.ObjectMap.java

protected <N extends Number> List<N> getAsNumberList(String field, Class<N> clazz, Function<String, N> parser,
        String separator) {//from  w w  w.j a v  a 2  s .  co m
    List list = getAsList(field, separator);

    if (list.isEmpty()) {
        List<N> emptyList = Collections.<N>emptyList();
        put(field, emptyList);
        return emptyList;
    } else {
        boolean valid = true;
        for (Object o : list) {
            if (!clazz.isInstance(o)) {
                valid = false;
                break;
            }
        }
        if (valid) {
            return list;
        } else {
            List<N> numericList = new ArrayList<>(list.size());
            for (Object o : list) {
                if (clazz.isInstance(o)) {
                    numericList.add(clazz.cast(o));
                } else {
                    numericList.add(parser.apply(o.toString()));
                }
            }
            return numericList;
        }
    }
}

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From source file:com.cloudbees.plugins.credentials.CredentialsProvider.java

/**
 * Make a best effort to ensure that the supplied credential is a snapshot credential (i.e. self-contained and
 * does not reference any external stores)
 *
 * @param clazz      the type of credential that we are trying to snapshot (specified so that if there is more than
 *                   one type of snapshot able credential interface implemented by the credentials,
 *                   then they can be separated out.
 * @param credential the credential.//from   w ww .ja  va2 s .co m
 * @param <C>        the type of credential.
 * @return the credential or a snapshot of the credential.
 * @since 1.14
 */
@SuppressWarnings("unchecked")
public static <C extends Credentials> C snapshot(Class<C> clazz, C credential) {
    Class bestType = null;
    CredentialsSnapshotTaker bestTaker = null;
    for (CredentialsSnapshotTaker taker : ExtensionList.lookup(CredentialsSnapshotTaker.class)) {
        if (clazz.isAssignableFrom(taker.type()) && taker.type().isInstance(credential)) {
            if (bestTaker == null || bestType.isAssignableFrom(taker.type())) {
                bestTaker = taker;
                bestType = taker.type();
            }
        }
    }
    if (bestTaker == null) {
        return credential;
    }
    return clazz.cast(bestTaker.snapshot(credential));
}

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From source file:com.teotigraphix.caustk.sound.SoundSource.java

@SuppressWarnings("unchecked")
@Override//from  w  w  w. j  a v a 2  s  . c o m
public <T extends Tone> T createTone(int index, String name, Class<? extends Tone> toneClass)
        throws CausticException {
    T tone = null;
    try {
        Constructor<? extends Tone> constructor = toneClass.getConstructor(ICaustkController.class);
        tone = (T) constructor.newInstance(getController());
        initializeTone(tone, name, tone.getToneType(), index);
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (SecurityException e) {
        e.printStackTrace();
    } catch (InstantiationException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }

    SoundSourceUtils.setup(toneClass.cast(tone));

    RackMessage.CREATE.send(getController(), tone.getToneType().getValue(), tone.getName(), tone.getIndex());

    toneAdd(index, tone);

    return tone;
}

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From source file:com.haulmont.cuba.web.gui.components.WebLookupField.java

@Override
public <T> void setOptionIconProvider(Class<T> optionClass, OptionIconProvider<T> optionIconProvider) {
    if (this.optionIconProvider != optionIconProvider) {
        // noinspection unchecked
        this.optionIconProvider = optionIconProvider;

        if (optionIconProvider == null) {
            component.setOptionIconProvider(null);
        } else {/*w w w.  j a v  a 2  s .  c o m*/
            component.setOptionIconProvider(itemId -> {
                T typedItem = optionClass.cast(itemId);

                String resourceId;
                try {
                    // noinspection unchecked
                    resourceId = optionIconProvider.getItemIcon(typedItem);
                } catch (Exception e) {
                    LoggerFactory.getLogger(WebLookupField.class)
                            .warn("Error invoking OptionIconProvider getItemIcon method", e);
                    return null;
                }

                return WebComponentsHelper.getIcon(resourceId);
            });
        }
    }
}

---

From source file:org.openmrs.calculation.CalculationUtil.java

/**
 * Utility method that casts the specified value to the specified Type and handles conversions
 * to primitive wrapper classes in a better/more lenient way than java's type casting. Note that
 * the method will throw a {@link ConversionException} at runtime if it fails to convert the
 * specified value//from  w w w  .  jav a  2  s. c  om
 * 
 * @see ConversionException
 * @param valueToCast the value to be cast
 * @param clazz the class to cast to
 * @return a value of the specified type
 * @should fail if the value to convert is not of a compatible type
 * @should convert the value to the specified type if it is compatible
 * @should return null if the passed in value is null
 * @should convert a valid string value to Boolean
 * @should convert a character value to Character
 * @should convert a valid string value to Short
 * @should convert a valid string value to Integer
 * @should convert a valid string value to Long
 * @should convert a valid string value to Float
 * @should convert a valid string value to Double
 * @should convert a valid string value to Byte
 * @should convert a single character value to Short
 * @should convert a valid single character value to Integer
 * @should convert a valid single character value to Long
 * @should convert a result with an number value in the valid range to byte
 * @should convert a valid string to an enum constant
 * @should convert a valid string to a class object
 * @should convert a valid string to a Locale
 * @should format a date object to a string using the default date format
 */
@SuppressWarnings("unchecked")
public static <T> T cast(Object value, Class<T> clazz) {
    if (value == null)
        return null;

    if (clazz == null)
        throw new IllegalArgumentException("The class to cast to cannot be null");

    T castValue = null;
    // We should be able to convert any value to a String      
    if (String.class.isAssignableFrom(clazz)) {
        if (Date.class.isAssignableFrom(value.getClass()))
            castValue = (T) Context.getDateFormat().format((Date) value);
        else
            castValue = (T) value.toString();
    } else {
        //we should be able to convert strings to simple types like String "2" to integer 2, 
        //enums, dates, etc. Java types casting doesn't allow this so we need to transform the value first to
        //a string. BeanUtils from old spring versions doesn't consider enums as simple types
        if (BeanUtils.isSimpleValueType(clazz) || clazz.isEnum()) {
            try {
                String stringValue = null;
                //objects of types like date and Class whose toString methods are not reliable
                if (String.class.isAssignableFrom(value.getClass()))
                    stringValue = (String) value;
                else
                    stringValue = value.toString();

                if (Character.class.equals(clazz) && stringValue.length() == 1) {
                    value = stringValue.charAt(0);
                } else if (Locale.class.isAssignableFrom(clazz)) {
                    return (T) LocaleUtility.fromSpecification(stringValue);
                } else if (Class.class.isAssignableFrom(clazz)) {
                    return (T) Context.loadClass(stringValue);
                } else {
                    Method method = clazz.getMethod("valueOf", new Class<?>[] { String.class });
                    value = method.invoke(null, stringValue);
                }
            } catch (Exception e) {
                //ignore and default to clazz.cast below
            }
        }

        try {
            castValue = clazz.cast(value);
        } catch (ClassCastException e) {
            throw new ConversionException(value, clazz);
        }
    }

    return castValue;
}

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From source file:io.sqp.client.impl.SqpConnectionImpl.java

private <T> CompletableFuture<T> getInformation(Class<T> infoType, InformationSubject subject, String detail) {
    CompletableFuture<T> future = new CompletableFuture<>();
    if (!checkOpenAndNoErrors(future)) {
        return future;
    }/*from w ww. j  ava 2 s  . c  o  m*/
    send(new InformationRequestMessage(subject, detail), new ResponseHandler<>(future, m -> {
        if (m.isA(MessageType.ReadyMessage)) {
            return false; // just ignore them
        } else if (m.isA(MessageType.InformationResponseMessage)) {
            InformationResponseMessage response = m.secureCast();
            Object value = response.getValue();
            if (!response.getResponseType().isCompatibleTo(infoType)) {
                future.completeExceptionally(new UnexpectedResultTypeException(value, infoType));
            } else {
                future.complete(infoType.cast(value));
            }
            return true;
        }
        throw new UnexpectedMessageException("waiting for information response", m);
    }));
    return future;
}

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From source file:com.liferay.ide.maven.core.LiferayMavenProjectProvider.java

@Override
public <T> List<T> getData(String key, Class<T> type, Object... params) {
    List<T> retval = null;//ww w.j  a  va  2 s . c  o m

    if ("profileIds".equals(key)) {
        final List<T> profileIds = new ArrayList<T>();

        try {
            final List<Profile> profiles = MavenPlugin.getMaven().getSettings().getProfiles();

            for (final Profile profile : profiles) {
                if (profile.getActivation() != null) {
                    if (profile.getActivation().isActiveByDefault()) {
                        continue;
                    }
                }

                profileIds.add(type.cast(profile.getId()));
            }

            if (params[0] != null && params[0] instanceof File) {
                final File locationDir = (File) params[0];

                File pomFile = new File(locationDir, IMavenConstants.POM_FILE_NAME);

                if (!pomFile.exists() && locationDir.getParentFile().exists()) {
                    // try one level up for when user is adding new module
                    pomFile = new File(locationDir.getParentFile(), IMavenConstants.POM_FILE_NAME);
                }

                if (pomFile.exists()) {
                    final IMaven maven = MavenPlugin.getMaven();

                    Model model = maven.readModel(pomFile);

                    File parentDir = pomFile.getParentFile();

                    while (model != null) {
                        for (org.apache.maven.model.Profile p : model.getProfiles()) {
                            profileIds.add(type.cast(p.getId()));
                        }

                        parentDir = parentDir.getParentFile();

                        if (parentDir != null && parentDir.exists()) {
                            try {
                                model = maven.readModel(new File(parentDir, IMavenConstants.POM_FILE_NAME));
                            } catch (Exception e) {
                                model = null;
                            }
                        }
                    }
                }
            }
        } catch (CoreException e) {
            LiferayMavenCore.logError(e);
        }

        retval = profileIds;
    } else if ("liferayVersions".equals(key)) {
        final List<T> possibleVersions = new ArrayList<T>();

        final RepositorySystem system = AetherUtil.newRepositorySystem();

        final RepositorySystemSession session = AetherUtil.newRepositorySystemSession(system);

        final String groupId = params[0].toString();
        final String artifactId = params[1].toString();

        final String coords = groupId + ":" + artifactId + ":[6,)";

        final Artifact artifact = new DefaultArtifact(coords);

        final VersionRangeRequest rangeRequest = new VersionRangeRequest();
        rangeRequest.setArtifact(artifact);
        rangeRequest.addRepository(AetherUtil.newCentralRepository());
        rangeRequest.addRepository(AetherUtil.newLiferayRepository());

        try {
            final VersionRangeResult rangeResult = system.resolveVersionRange(session, rangeRequest);

            final List<Version> versions = rangeResult.getVersions();

            for (Version version : versions) {
                final String val = version.toString();

                if (!"6.2.0".equals(val)) {
                    possibleVersions.add(type.cast(val));
                }
            }

            retval = possibleVersions;
        } catch (VersionRangeResolutionException e) {
        }
    } else if ("parentVersion".equals(key)) {
        final List<T> version = new ArrayList<T>();

        final File locationDir = (File) params[0];

        final File parentPom = new File(locationDir, IMavenConstants.POM_FILE_NAME);

        if (parentPom.exists()) {
            try {
                final IMaven maven = MavenPlugin.getMaven();

                final Model model = maven.readModel(parentPom);

                version.add(type.cast(model.getVersion()));

                retval = version;
            } catch (CoreException e) {
                LiferayMavenCore.logError("unable to get parent version", e);
            }
        }
    } else if ("parentGroupId".equals(key)) {
        final List<T> groupId = new ArrayList<T>();

        final File locationDir = (File) params[0];

        final File parentPom = new File(locationDir, IMavenConstants.POM_FILE_NAME);

        if (parentPom.exists()) {
            try {
                final IMaven maven = MavenPlugin.getMaven();

                final Model model = maven.readModel(parentPom);

                groupId.add(type.cast(model.getGroupId()));

                retval = groupId;
            } catch (CoreException e) {
                LiferayMavenCore.logError("unable to get parent groupId", e);
            }
        }
    } else if ("archetypeGAV".equals(key)) {
        final String frameworkType = (String) params[0];

        final String value = LiferayMavenCore.getPreferenceString("archetype-gav-" + frameworkType, "");

        retval = Collections.singletonList(type.cast(value));
    }

    return retval;
}

---

From source file:it.delli.mwebc.servlet.MWebCManager.java

private void updateServerWidget(Page page, JsonObject widgetProp) {
    Widget widget = page.getWidget(widgetProp.get("id").getAsString());
    CastHelper castHelper = page.getApplication().getCastHelper(widget.getClass());
    JsonArray data = widgetProp.get("data").getAsJsonArray();
    for (int j = 0; j < data.size(); j++) {
        JsonObject itemData = data.get(j).getAsJsonObject();
        Field fieldAttribute = ReflectionUtils.getAnnotatedField(widget.getClass(),
                itemData.get("attribute").getAsString(), WidgetAttribute.class);
        if (fieldAttribute != null) {
            fieldAttribute.setAccessible(true);
            Class<?> paramType = fieldAttribute.getType();
            try {
                String value = null;
                if (itemData.get("value") == null || itemData.get("value") instanceof JsonNull) {
                    value = null;//  w  w w. j  a  v  a 2  s  . c o m
                } else if (itemData.get("value") instanceof JsonArray) {
                    JsonArray valueArray = (JsonArray) itemData.get("value");
                    ArrayList<String> tmp = new ArrayList<String>();
                    for (JsonElement jsonElement : valueArray) {
                        tmp.add(jsonElement.getAsString());
                    }
                    if (tmp.size() > 0) {
                        value = StringUtils.join(tmp, ",");
                    } else {
                        value = null;
                    }
                } else if (itemData.get("value") instanceof JsonObject) {
                    value = itemData.get("value").toString();
                } else {
                    value = itemData.get("value").getAsString();
                }
                fieldAttribute.setAccessible(true);
                fieldAttribute.set(widget, paramType.cast(castHelper.toType(value, paramType)));
            } catch (Exception e) {
                log.warn("Warning in updating server widgets attribute '"
                        + itemData.get("attribute").getAsString() + "' for widget "
                        + widget.getClass().getName(), e);
            }
        } else {
            log.warn("Warning in updating server widgets attribute. The attribute '"
                    + itemData.get("attribute").getAsString() + "' doesn't exist for widget "
                    + widget.getClass().getName());
        }
    }
}

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From source file:com.github.yihtserns.jaxbean.unmarshaller.api.BlueprintBeanHandlerTest.java

private <T> T doUnmarshal(String blueprintXml, Class<T> rootType, Class<?>... otherTypes) throws Exception {
    File file = tempFolder.newFile();
    FileUtils.write(file, blueprintXml);

    final String id = "bean";
    final JaxbeanUnmarshaller unmarshaller = JaxbeanUnmarshaller.newInstance(merge(rootType, otherTypes));
    final URI jaxbNamespaceUri = new URI("http://example.com/jaxb");
    BlueprintContainerImpl blueprintContainer = new BlueprintContainerImpl(getClass().getClassLoader(),
            Arrays.asList(file.toURI().toURL()), false) {

        @Override// w  w w  .j a v  a 2s  .c  om
        protected NamespaceHandlerSet createNamespaceHandlerSet() {
            SimpleNamespaceHandlerSet nsHandlerSet = (SimpleNamespaceHandlerSet) super.createNamespaceHandlerSet();
            if (!nsHandlerSet.getNamespaces().contains(jaxbNamespaceUri)) {
                nsHandlerSet.addNamespace(jaxbNamespaceUri, null,
                        new UnmarshallerNamespaceHandler(unmarshaller, id));
            }

            return nsHandlerSet;
        }

    };
    blueprintContainer.init(false);

    try {
        return rootType.cast(blueprintContainer.getComponentInstance(id));
    } finally {
        blueprintContainer.destroy();
    }
}

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