Example usage for java.lang.reflect Constructor newInstance

Introduction

In this page you can find the example usage for java.lang.reflect Constructor newInstance.

Prototype

@CallerSensitive
@ForceInline 
public T newInstance(Object... initargs) throws InstantiationException, IllegalAccessException,
        IllegalArgumentException, InvocationTargetException 

Source Link

Document

Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.

Usage

From source file:com.inmobi.grill.server.metastore.JAXBUtils.java

public static Storage storageFromXStorage(XStorage xs) {
    if (xs == null) {
        return null;
    }//from ww  w . ja v  a 2s  .co m

    Storage storage = null;
    try {
        Class<?> clazz = Class.forName(xs.getClassname());
        Constructor<?> constructor = clazz.getConstructor(String.class);
        storage = (Storage) constructor.newInstance(new Object[] { xs.getName() });
        storage.addProperties(mapFromXProperties(xs.getProperties()));
        return storage;
    } catch (Exception e) {
        throw new WebApplicationException(
                "Could not create storage class" + xs.getClassname() + "with name:" + xs.getName(), e);
    }
}

---

From source file:cascading.util.Util.java

public static Object createProtectedObject(Class type, Object[] parameters, Class[] parameterTypes) {
    try {//from ww  w  .  java2 s .  c om
        Constructor constructor = type.getDeclaredConstructor(parameterTypes);

        constructor.setAccessible(true);

        return constructor.newInstance(parameters);
    } catch (Exception exception) {
        exception.printStackTrace();

        throw new FlowException("unable to instantiate type: " + type.getName(), exception);
    }
}

---

From source file:org.paxml.util.ReflectUtils.java

/**
 * Coerce object type./*from ww w.  j  a v a  2s.  co  m*/
 * 
 * @param <T>
 *            the expected type
 * @param from
 *            from object
 * @param expectedType
 *            to object type
 * @return the to object
 */
public static <T> T coerceType(Object from, Class<? extends T> expectedType) {
    if (from == null) {
        return null;
    }
    Object targetValue = null;
    if (expectedType.isInstance(from)) {
        targetValue = from;
    } else if (expectedType.isEnum()) {
        for (Object e : expectedType.getEnumConstants()) {
            if (from.toString().equalsIgnoreCase(e.toString())) {
                targetValue = e;
                break;
            }
        }
        if (targetValue == null) {
            throw new PaxmlRuntimeException(
                    "No enum named '" + from + "' is defined in class: " + expectedType);
        }
    } else if (List.class.equals(expectedType)) {
        targetValue = new ArrayList();
        collect(from, (Collection) targetValue, true);
    } else if (Set.class.equals(expectedType)) {
        targetValue = new LinkedHashSet();
        collect(from, (Collection) targetValue, true);
    } else if (isImplementingClass(expectedType, Collection.class, false)) {
        try {
            targetValue = expectedType.newInstance();
        } catch (Exception e) {
            throw new PaxmlRuntimeException(e);
        }
        collect(from, (Collection) targetValue, true);
    } else if (Iterator.class.equals(expectedType)) {
        List list = new ArrayList();
        collect(from, list, true);
        targetValue = list.iterator();
    } else if (isImplementingClass(expectedType, Coerceable.class, false)) {

        try {
            Constructor c = expectedType.getConstructor(Object.class);
            targetValue = c.newInstance(from);
        } catch (Exception e) {
            throw new PaxmlRuntimeException(e);
        }
    } else if (from instanceof Map) {
        return mapToBean((Map) from, expectedType);
    } else {
        targetValue = ConvertUtils.convert(from.toString(), expectedType);
    }

    return (T) targetValue;
}

---

From source file:disko.DU.java

@SuppressWarnings("unchecked")
public static <T> T cloneObject(T p, Mapping<Pair<Object, String>, Boolean> propertyFilter) throws Exception {
    if (p == null)
        return null;

    if (p instanceof Cloneable) {
        Method cloneMethod = p.getClass().getMethod("clone", (Class[]) null);
        if (cloneMethod != null)
            return (T) cloneMethod.invoke(p, (Object[]) null);

    } else if (p.getClass().isArray()) {
        Object[] A = (Object[]) p;
        Class<?> type = p.getClass();
        Object[] ac = (Object[]) Array.newInstance(type.getComponentType(), A.length);
        for (int i = 0; i < A.length; i++)
            ac[i] = cloneObject(A[i], propertyFilter);
        return (T) ac;
    } else if (identityCloneClasses.contains(p.getClass()))
        return p;

    ////from  www. j  a  va  2 s  . c  om
    // Need to implement cloning ourselves. We do this by copying bean properties.
    //
    Constructor<?> cons = null;

    try {
        cons = p.getClass().getConstructor((Class[]) null);
    } catch (Throwable t) {
        return p;
    }

    Object copy = cons.newInstance((Object[]) null);

    if (p instanceof Collection) {
        Collection<Object> cc = (Collection<Object>) copy;
        for (Object el : (Collection<?>) p)
            cc.add(cloneObject(el, propertyFilter));
    } else if (p instanceof Map) {
        Map<Object, Object> cm = (Map<Object, Object>) copy;
        for (Object key : ((Map<Object, Object>) p).keySet())
            cm.put(key, cloneObject(((Map<Object, Object>) p).get(key), propertyFilter));
    } else {
        BeanInfo bean_info = Introspector.getBeanInfo(p.getClass());
        PropertyDescriptor beanprops[] = bean_info.getPropertyDescriptors();
        if (beanprops == null || beanprops.length == 0)
            copy = p;
        else
            for (PropertyDescriptor desc : beanprops) {
                Method rm = desc.getReadMethod();
                Method wm = desc.getWriteMethod();
                if (rm == null || wm == null)
                    continue;
                Object value = rm.invoke(p, (Object[]) null);
                if (propertyFilter == null || propertyFilter.eval(new Pair<Object, String>(p, desc.getName())))
                    value = cloneObject(value, propertyFilter);
                wm.invoke(copy, new Object[] { value });
            }
    }
    return (T) copy;
}

---

From source file:com.controlj.addon.weather.wbug.service.WeatherBugDataUtils.java

/**
 * Navigates a XML document through an XPath and, for each encountered element, creates a specific WeatherBug data object (<i>Location</i>,
 * <i>Station</i>, and so on). Java reflection errors are silently ignored.
 * //from  ww  w .  j a  v a 2  s . com
 * @param elem
 *            the XML element being accessed.
 * @param path
 *            the XPath used to find specific sub-elements.
 * @param dataClass
 *            the class of objects being instantiated (<i>Location</i>, <i>Station</i>, and so on).
 * @return a list of <i>dataClass</i> objects.
 */
public static <T> List<T> bind(Element elem, String path, Class<T> dataClass) {
    Constructor<T> constr;
    try {
        constr = dataClass.getConstructor(ELEM_CLASS_ARRAY);
    } catch (SecurityException e) {
        return Collections.emptyList();
    } catch (NoSuchMethodException e) {
        return Collections.emptyList();
    }
    List<T> resultList = new ArrayList<T>();
    for (Object o : elem.selectNodes(path)) {
        Element item = (Element) o;
        try {
            resultList.add(constr.newInstance(item));
        } catch (IllegalArgumentException e) {
        } catch (InstantiationException e) {
        } catch (IllegalAccessException e) {
        } catch (InvocationTargetException e) {
        }
    }
    return resultList;
}

---

From source file:BrowserLauncher.java

/**
 * Called by a static initializer to load any classes, fields, and methods required at runtime
 * to locate the user's web browser./*from  w w  w . j  ava  2  s.co m*/
 * @return <code>true</code> if all intialization succeeded
 *         <code>false</code> if any portion of the initialization failed
 */
private static boolean loadClasses() {
    switch (jvm) {
    case MRJ_2_0:
        try {
            Class aeTargetClass = Class.forName("com.apple.MacOS.AETarget");
            Class osUtilsClass = Class.forName("com.apple.MacOS.OSUtils");
            Class appleEventClass = Class.forName("com.apple.MacOS.AppleEvent");
            Class aeClass = Class.forName("com.apple.MacOS.ae");
            aeDescClass = Class.forName("com.apple.MacOS.AEDesc");

            aeTargetConstructor = aeTargetClass.getDeclaredConstructor(new Class[] { int.class });
            appleEventConstructor = appleEventClass.getDeclaredConstructor(
                    new Class[] { int.class, int.class, aeTargetClass, int.class, int.class });
            aeDescConstructor = aeDescClass.getDeclaredConstructor(new Class[] { String.class });

            makeOSType = osUtilsClass.getDeclaredMethod("makeOSType", new Class[] { String.class });
            putParameter = appleEventClass.getDeclaredMethod("putParameter",
                    new Class[] { int.class, aeDescClass });
            sendNoReply = appleEventClass.getDeclaredMethod("sendNoReply", new Class[] {});

            Field keyDirectObjectField = aeClass.getDeclaredField("keyDirectObject");
            keyDirectObject = (Integer) keyDirectObjectField.get(null);
            Field autoGenerateReturnIDField = appleEventClass.getDeclaredField("kAutoGenerateReturnID");
            kAutoGenerateReturnID = (Integer) autoGenerateReturnIDField.get(null);
            Field anyTransactionIDField = appleEventClass.getDeclaredField("kAnyTransactionID");
            kAnyTransactionID = (Integer) anyTransactionIDField.get(null);
        } catch (ClassNotFoundException cnfe) {
            errorMessage = cnfe.getMessage();
            return false;
        } catch (NoSuchMethodException nsme) {
            errorMessage = nsme.getMessage();
            return false;
        } catch (NoSuchFieldException nsfe) {
            errorMessage = nsfe.getMessage();
            return false;
        } catch (IllegalAccessException iae) {
            errorMessage = iae.getMessage();
            return false;
        }
        break;
    case MRJ_2_1:
        try {
            mrjFileUtilsClass = Class.forName("com.apple.mrj.MRJFileUtils");
            mrjOSTypeClass = Class.forName("com.apple.mrj.MRJOSType");
            Field systemFolderField = mrjFileUtilsClass.getDeclaredField("kSystemFolderType");
            kSystemFolderType = systemFolderField.get(null);
            findFolder = mrjFileUtilsClass.getDeclaredMethod("findFolder", new Class[] { mrjOSTypeClass });
            getFileCreator = mrjFileUtilsClass.getDeclaredMethod("getFileCreator", new Class[] { File.class });
            getFileType = mrjFileUtilsClass.getDeclaredMethod("getFileType", new Class[] { File.class });
        } catch (ClassNotFoundException cnfe) {
            errorMessage = cnfe.getMessage();
            return false;
        } catch (NoSuchFieldException nsfe) {
            errorMessage = nsfe.getMessage();
            return false;
        } catch (NoSuchMethodException nsme) {
            errorMessage = nsme.getMessage();
            return false;
        } catch (SecurityException se) {
            errorMessage = se.getMessage();
            return false;
        } catch (IllegalAccessException iae) {
            errorMessage = iae.getMessage();
            return false;
        }
        break;
    case MRJ_3_0:
        try {
            Class linker = Class.forName("com.apple.mrj.jdirect.Linker");
            Constructor constructor = linker.getConstructor(new Class[] { Class.class });
            linkage = constructor.newInstance(new Object[] { BrowserLauncher.class });
        } catch (ClassNotFoundException cnfe) {
            errorMessage = cnfe.getMessage();
            return false;
        } catch (NoSuchMethodException nsme) {
            errorMessage = nsme.getMessage();
            return false;
        } catch (InvocationTargetException ite) {
            errorMessage = ite.getMessage();
            return false;
        } catch (InstantiationException ie) {
            errorMessage = ie.getMessage();
            return false;
        } catch (IllegalAccessException iae) {
            errorMessage = iae.getMessage();
            return false;
        }
        break;
    case MRJ_3_1:
        try {
            mrjFileUtilsClass = Class.forName("com.apple.mrj.MRJFileUtils");
            openURL = mrjFileUtilsClass.getDeclaredMethod("openURL", new Class[] { String.class });
        } catch (ClassNotFoundException cnfe) {
            errorMessage = cnfe.getMessage();
            return false;
        } catch (NoSuchMethodException nsme) {
            errorMessage = nsme.getMessage();
            return false;
        }
        break;
    default:
        break;
    }
    return true;
}

---

From source file:de.tudarmstadt.ukp.dkpro.wsd.WSDUtils.java

/**
 * Read key-value pairs of the specified types from the specified columns of
 * a delimited text file into a Map./*  ww  w.  j a va 2s . c  o  m*/
 *
 * @param url
 *            Location of the file to read
 * @param keyColumn
 *            The index of the column giving the keys
 * @param keyClass
 *            The class of the key
 * @param valueColumn
 *            The index of the column giving the values
 * @param valueClass
 *            The class of the value
 * @param delimiterRegex
 *            A regular expression for the field delimiter
 * @return A map of keys to values
 * @throws IOException
 * @throws IllegalArgumentException
 */
public static <K, V> Map<K, V> readMap(final URL url, final int keyColumn, final Class<K> keyClass,
        final int valueColumn, final Class<V> valueClass, final String delimiterRegex)
        throws IOException, IllegalArgumentException {
    Map<K, V> map = new HashMap<K, V>();
    InputStream is = url.openStream();
    String content = IOUtils.toString(is, "UTF-8");
    BufferedReader br = new BufferedReader(new StringReader(content));

    Constructor<K> keyConstructor;
    Constructor<V> valueConstructor;
    try {
        keyConstructor = keyClass.getConstructor(String.class);
        valueConstructor = valueClass.getConstructor(String.class);
    } catch (Exception e) {
        throw new IllegalArgumentException(e);
    }

    String line;
    String[] lineParts;

    while ((line = br.readLine()) != null) {
        lineParts = line.split(delimiterRegex);
        K key;
        V value;
        try {
            key = keyConstructor.newInstance(lineParts[keyColumn - 1]);
            value = valueConstructor.newInstance(lineParts[valueColumn - 1]);
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
        map.put(key, value);
    }
    return map;
}

---

From source file:de.tudarmstadt.ukp.dkpro.wsd.WSDUtils.java

/**
 * Read key-value pairs of the specified types from the specified columns of
 * a delimited text file into a Multimap.
 *
 * @param url//from  w ww .ja va2 s  . co m
 *            Location of the file to read
 * @param keyColumn
 *            The index of the column giving the keys
 * @param keyClass
 *            The class of the key
 * @param valueColumn
 *            The index of the column giving the values
 * @param valueClass
 *            The class of the value
 * @param delimiterRegex
 *            A regular expression for the field delimiter
 * @return A map of keys to values
 * @throws IOException
 * @throws IllegalArgumentException
 */
public static <K, V> Multimap<K, V> readMultimap(final URL url, final int keyColumn, final Class<K> keyClass,
        final int valueColumn, final Class<V> valueClass, final String delimiterRegex)
        throws IOException, IllegalArgumentException {
    Multimap<K, V> map = HashMultimap.create();
    InputStream is = url.openStream();
    String content = IOUtils.toString(is, "UTF-8");
    BufferedReader br = new BufferedReader(new StringReader(content));

    Constructor<K> keyConstructor;
    Constructor<V> valueConstructor;
    try {
        keyConstructor = keyClass.getConstructor(String.class);
        valueConstructor = valueClass.getConstructor(String.class);
    } catch (Exception e) {
        throw new IllegalArgumentException(e);
    }

    String line;
    String[] lineParts;

    while ((line = br.readLine()) != null) {
        lineParts = line.split(delimiterRegex);
        K key;
        V value;
        try {
            key = keyConstructor.newInstance(lineParts[keyColumn - 1]);
            value = valueConstructor.newInstance(lineParts[valueColumn - 1]);
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
        map.put(key, value);
    }
    return map;
}

---

From source file:net.jofm.metadata.PrimitiveFieldMetaData.java

private static Format createFormatter(Field fieldAnnotation, Class<?> fieldType, String fieldName,
        FormatConfig formatConfig) {/*from ww w.  j  ava 2s .c o m*/
    String defaultFormat = "";
    Class<? extends Format> formatterClazz = null;
    if (Date.class.isAssignableFrom(fieldType) || Calendar.class.isAssignableFrom(fieldType)) {
        defaultFormat = formatConfig.getDateFormat();
        formatterClazz = DateFormat.class;
    } else if (String.class.isAssignableFrom(fieldType)) {
        formatterClazz = StringFormat.class;
    } else if (fieldType.equals(BigDecimal.class)) {
        defaultFormat = formatConfig.getBigDecimalFormat();
        formatterClazz = NumberFormat.class;
    } else if (fieldType.equals(Short.class) || fieldType.equals(short.class)) {
        defaultFormat = formatConfig.getShortFormat();
        formatterClazz = NumberFormat.class;
    } else if (fieldType.equals(Integer.class) || fieldType.equals(int.class)) {
        defaultFormat = formatConfig.getIntFormat();
        formatterClazz = NumberFormat.class;
    } else if (fieldType.equals(Long.class) || fieldType.equals(long.class)) {
        defaultFormat = formatConfig.getLongFormat();
        formatterClazz = NumberFormat.class;
    } else if (fieldType.equals(Float.class) || fieldType.equals(float.class)) {
        defaultFormat = formatConfig.getFloatFormat();
        formatterClazz = NumberFormat.class;
    } else if (fieldType.equals(Double.class) || fieldType.equals(double.class)) {
        defaultFormat = formatConfig.getDoubleFormat();
        formatterClazz = NumberFormat.class;
    } else if (fieldType.equals(Boolean.class) || fieldType.equals(boolean.class)) {
        defaultFormat = formatConfig.getBooleanFormat();
        formatterClazz = BooleanFormat.class;
    } else if (fieldType.isEnum()) {
        formatterClazz = EnumFormat.class;
    }

    if (fieldAnnotation.formatter() != null && !fieldAnnotation.formatter().equals(DefaultFormat.class)) {
        formatterClazz = fieldAnnotation.formatter();
    }

    if (formatterClazz == null) {
        throw new FixedMappingException(
                "Unable to find formatter for field '" + fieldName + "' of type " + fieldType);
    }

    try {
        Constructor<?> c = formatterClazz
                .getConstructor(new Class[] { Pad.class, char.class, int.class, String.class });

        Pad pad = fieldAnnotation.pad() == Pad.DEFAULT ? formatConfig.getPad() : fieldAnnotation.pad();
        char padWith = fieldAnnotation.padWith() == Character.MIN_VALUE ? formatConfig.getPadWith()
                : fieldAnnotation.padWith();
        int length = fieldAnnotation.length();
        String format = StringUtils.isEmpty(fieldAnnotation.format()) ? defaultFormat
                : fieldAnnotation.format();

        return (Format) c.newInstance(new Object[] { pad, padWith, length, format });
    } catch (Exception e) {
        throw new FixedMappingException(
                "Unable to instantiate the formatter " + formatterClazz + " for field '" + fieldName + "'", e);
    }
}

---

From source file:com.pentaho.big.data.bundles.impl.shim.common.ShimBridgingClassloader.java

public static Object create(BundleContext bundleContext, String className, List<Object> arguments)
        throws KettlePluginException, ClassNotFoundException, IllegalAccessException, InstantiationException,
        InvocationTargetException {
    ShimBridgingClassloader shimBridgingClassloader = new ShimBridgingClassloader(pluginClassloaderGetter
            .getPluginClassloader(LifecyclePluginType.class.getCanonicalName(), HADOOP_SPOON_PLUGIN),
            bundleContext);//from w w w. j  a v a 2s .co m
    Class<?> clazz = Class.forName(className, true, shimBridgingClassloader);
    if (arguments == null || arguments.size() == 0) {
        return clazz.newInstance();
    }
    for (Constructor<?> constructor : clazz.getConstructors()) {
        Class<?>[] parameterTypes = constructor.getParameterTypes();
        if (parameterTypes.length == arguments.size()) {
            boolean match = true;
            for (int i = 0; i < parameterTypes.length; i++) {
                Object o = arguments.get(i);
                if (o != null && !parameterTypes[i].isInstance(o)) {
                    match = false;
                    break;
                }
            }
            if (match) {
                return constructor.newInstance(arguments.toArray());
            }
        }
    }
    throw new InstantiationException(
            "Unable to find constructor for class " + className + " with arguments " + arguments);
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• »