Example usage for java.lang Class getDeclaredConstructor

Introduction

In this page you can find the example usage for java.lang Class getDeclaredConstructor.

Prototype

@CallerSensitive
public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
        throws NoSuchMethodException, SecurityException 

Source Link

Document

Returns a Constructor object that reflects the specified constructor of the class or interface represented by this Class object.

Usage

From source file:org.apache.tez.engine.runtime.RuntimeUtils.java

@SuppressWarnings("unchecked")
public static <T> T getNewInstance(Class<T> theClass, TezEngineTaskContext context) {
    T result;// www  . j  ava  2  s .  com
    try {
        Constructor<T> meth = (Constructor<T>) CONSTRUCTOR_CACHE.get(theClass);
        if (meth == null) {
            meth = theClass.getDeclaredConstructor(CONTEXT_ARRAY);
            meth.setAccessible(true);
            CONSTRUCTOR_CACHE.put(theClass, meth);
        }
        result = meth.newInstance(context);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return result;
}

---

From source file:org.apache.tez.engine.runtime.RuntimeUtils.java

@SuppressWarnings("unchecked")
public static <T> T getNewInputInstance(Class<T> theClass, TezEngineTaskContext context, int index) {
    T result;//from   w ww  .  j a  va2  s. c o m
    try {
        Constructor<T> meth = (Constructor<T>) CONSTRUCTOR_CACHE.get(theClass);
        if (meth == null) {
            meth = theClass.getDeclaredConstructor(CONTEXT_INT_ARRAY);
            meth.setAccessible(true);
            CONSTRUCTOR_CACHE.put(theClass, meth);
        }
        result = meth.newInstance(context, index);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return result;
}

---

From source file:com.microsoft.tfs.client.common.git.utils.GitHelpers.java

public static Object getInstance(final String pluginName, final String className,
        final Class<?>[] constructorParameterTypes, final Object[] constructorParameterValues) {
    Check.notNullOrEmpty(pluginName, "pluginName"); //$NON-NLS-1$
    Check.notNullOrEmpty(className, "className"); //$NON-NLS-1$
    Check.notNull(constructorParameterTypes, "constructorParameterTypes"); //$NON-NLS-1$
    Check.notNull(constructorParameterTypes, "constructorParameterTypes"); //$NON-NLS-1$

    final Class<?> operationClass = getClass(pluginName, className);
    if (operationClass == null) {
        return null;
    }/*from   w  w w  .j ava2 s  . c o  m*/

    final Constructor<?> constructor;
    try {
        constructor = operationClass.getDeclaredConstructor(constructorParameterTypes);
        constructor.setAccessible(true);
    } catch (final Exception e) {
        log.error("Searching for the " + operationClass.getName() + " constructor", e); //$NON-NLS-1$ //$NON-NLS-2$
        return null;
    }

    final Object operationInstance;
    try {
        operationInstance = constructor.newInstance(constructorParameterValues);
    } catch (final Exception e) {
        log.error("Creating the " + operationClass.getName() + " object", e); //$NON-NLS-1$ //$NON-NLS-2$
        return null;
    }

    return operationInstance;
}

---

From source file:org.wikipedia.nirvana.statistics.StatisticsFabric.java

@SuppressWarnings("unchecked")
static Statistics createReporter(NirvanaWiki wiki, String type, int year) {
    Statistics ob = null;/* w  w w.  j  ava  2  s  . c  o  m*/
    MultiKey multiKey = new MultiKey(type, new Integer(year));
    ob = (Statistics) reportersYear.get(multiKey);
    if (ob == null) {
        Class cl = reporterClass.get(type);
        if (cl == null)
            return null;
        try {
            Class params[] = new Class[] { NirvanaWiki.class, String.class, int.class };
            Constructor c = cl.getDeclaredConstructor(params);
            ob = (Statistics) c.newInstance(wiki, type, year);
            reportersYear.put(multiKey, ob);
        } catch (Exception e) {
            log.error(e.toString());
            e.printStackTrace();
        }
    }
    // NULL return value will tell about error         
    return ob;
}

---

From source file:com.frostwire.android.gui.UniversalScanner.java

private static Uri nativeScanFile(Context context, String path) {
    try {//www .  j  av a  2s.c o m
        File f = new File(path);

        Class<?> clazz = Class.forName("android.media.MediaScanner");

        Constructor<?> mediaScannerC = clazz.getDeclaredConstructor(Context.class);
        Object scanner = mediaScannerC.newInstance(context);

        try {
            Method setLocaleM = clazz.getDeclaredMethod("setLocale", String.class);
            setLocaleM.invoke(scanner, Locale.US.toString());
        } catch (Throwable e) {
            e.printStackTrace();
        }

        Field mClientF = clazz.getDeclaredField("mClient");
        mClientF.setAccessible(true);
        Object mClient = mClientF.get(scanner);

        Method scanSingleFileM = clazz.getDeclaredMethod("scanSingleFile", String.class, String.class,
                String.class);
        Uri fileUri = (Uri) scanSingleFileM.invoke(scanner, f.getAbsolutePath(), "external", "data/raw");
        int n = context.getContentResolver().delete(fileUri, null, null);
        if (n > 0) {
            LOG.debug("Deleted from Files provider: " + fileUri);
        }

        Field mNoMediaF = mClient.getClass().getDeclaredField("mNoMedia");
        mNoMediaF.setAccessible(true);
        mNoMediaF.setBoolean(mClient, false);

        // This is only for HTC (tested only on HTC One M8)
        try {
            Field mFileCacheF = clazz.getDeclaredField("mFileCache");
            mFileCacheF.setAccessible(true);
            mFileCacheF.set(scanner, new HashMap<String, Object>());
        } catch (Throwable e) {
            // no an HTC, I need some time to refactor this hack
        }

        try {
            Field mFileCacheF = clazz.getDeclaredField("mNoMediaPaths");
            mFileCacheF.setAccessible(true);
            mFileCacheF.set(scanner, new HashMap<String, String>());
        } catch (Throwable e) {
            e.printStackTrace();
        }

        Method doScanFileM = mClient.getClass().getDeclaredMethod("doScanFile", String.class, String.class,
                long.class, long.class, boolean.class, boolean.class, boolean.class);
        Uri mediaUri = (Uri) doScanFileM.invoke(mClient, f.getAbsolutePath(), null, f.lastModified(),
                f.length(), false, true, false);

        Method releaseM = clazz.getDeclaredMethod("release");
        releaseM.invoke(scanner);

        return mediaUri;

    } catch (Throwable e) {
        e.printStackTrace();
        return null;
    }
}

---

From source file:org.apache.tajo.ws.rs.resources.outputs.RestOutputFactory.java

private static Map<String, String> load() {
    Map<String, String> outputClasses = Maps.newHashMap();
    Set<Class> restOutputClasses = ClassUtil.findClasses(AbstractStreamingOutput.class,
            "org.apache.tajo.ws.rs.resources.outputs");

    for (Class eachClass : restOutputClasses) {
        if (eachClass.isInterface() || Modifier.isAbstract(eachClass.getModifiers())) {
            continue;
        }/* w w w. ja  v a2 s.c  o m*/

        AbstractStreamingOutput streamingOutput = null;
        try {
            streamingOutput = (AbstractStreamingOutput) eachClass
                    .getDeclaredConstructor(
                            new Class[] { NonForwardQueryResultScanner.class, Integer.class, Integer.class })
                    .newInstance(null, 0, 0);
        } catch (Exception e) {
            LOG.warn(eachClass + " cannot instantiate Function class because of " + e.getMessage(), e);
            continue;
        }
        String className = streamingOutput.getClass().getCanonicalName();
        String headerType = streamingOutput.getClass().getAnnotation(RestReturnType.class).mimeType();

        if (StringUtils.isNotEmpty(headerType)) {
            outputClasses.put(headerType, className);
        }
    }

    return outputClasses;
}

---

From source file:org.apache.hadoop.util.ReflectionUtils.java

/** Create an object for the given class and initialize it from conf
 *
 * @param theClass class of which an object is created
 * @param conf Configuration// w ww  . j av  a 2 s  .c o  m
 * @return a new object
 */
@SuppressWarnings("unchecked")
public static <T> T newInstance(Class<T> theClass, Configuration conf) {
    T result;
    try {
        Constructor<T> meth = theClass.getDeclaredConstructor(EMPTY_ARRAY);
        meth.setAccessible(true);
        result = meth.newInstance();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    setConf(result, conf);
    return result;
}

---

From source file:com.oltpbenchmark.util.ClassUtil.java

/** Create an object for the given class and initialize it from conf
*
* @param theClass class of which an object is created
* @param expected the expected parent class or interface
* @return a new object//from  w w w  .  j  a  v  a 2  s .  c  om
*/
public static <T> T newInstance(Class<?> theClass, Class<T> expected) {
    T result;
    try {
        if (!expected.isAssignableFrom(theClass)) {
            throw new Exception("Specified class " + theClass.getName() + "" + "does not extend/implement "
                    + expected.getName());
        }
        Class<? extends T> clazz = (Class<? extends T>) theClass;
        Constructor<? extends T> meth = clazz.getDeclaredConstructor(EMPTY_ARRAY);
        meth.setAccessible(true);
        result = meth.newInstance();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return result;
}

---

From source file:org.jfree.data.time.RegularTimePeriod.java

/**
 * Creates a time period that includes the specified millisecond, assuming
 * the given time zone.//ww  w .  ja va2  s.c o m
 *
 * @param c  the time period class.
 * @param millisecond  the time.
 * @param zone  the time zone.
 * @param locale  the locale.
 *
 * @return The time period.
 */
public static RegularTimePeriod createInstance(Class c, Date millisecond, TimeZone zone, Locale locale) {
    RegularTimePeriod result = null;
    try {
        Constructor constructor = c
                .getDeclaredConstructor(new Class[] { Date.class, TimeZone.class, Locale.class });
        result = (RegularTimePeriod) constructor.newInstance(new Object[] { millisecond, zone, locale });
    } catch (Exception e) {
        // do nothing, so null is returned
    }
    return result;
}

---

From source file:org.mule.config.dsl.internal.util.MessageFactoryUtil.java

/**
 * Returns the message factory associated with given payload type.
 *
 * @param payload     the payload/*from   www  .j av a 2  s .com*/
 * @param muleContext the mule context
 * @return the proper message factory
 */
public static MuleMessageFactory getMessageFactory(Object payload, MuleContext muleContext) {
    if (!cachedMessageTypes.containsKey(payload.getClass())) {
        boolean found = false;
        for (Map.Entry<Class, Class> messageType : messageTypes.entrySet()) {
            if (messageType.getKey().isAssignableFrom(payload.getClass())) {
                cachedMessageTypes.put(payload.getClass(), messageType.getValue());
                found = true;
                break;
            }
        }
        if (!found) {
            cachedMessageTypes.put(payload.getClass(), null);
        }
    }

    Class<? extends MuleMessageFactory> messageFactoryClass = cachedMessageTypes.get(payload.getClass());
    if (messageFactoryClass == null) {
        return new DefaultMuleMessageFactory(muleContext);
    }

    try {
        Constructor<? extends MuleMessageFactory> x = messageFactoryClass
                .getDeclaredConstructor(MuleContext.class);
        return x.newInstance(muleContext);
    } catch (Exception e) {
        throw new ConfigurationException("Can't create message factory.", e);
    }
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• »