Example usage for java.lang Class getConstructor

Introduction

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

Prototype

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

Source Link

Document

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

Usage

From source file:azkaban.common.utils.Utils.java

/**
 * Returns true if the constructor with the given args exists.
 * //from   w  ww .  j av  a2 s. c o m
 * @param c The class
 * @param args The arguments
 * @return
 */
public static boolean constructorExist(Class<?> c, Object... args) {
    Class<?>[] argTypes = getTypes(args);
    try {
        @SuppressWarnings("unused")
        Constructor<?> cons = c.getConstructor(argTypes);
    } catch (NoSuchMethodException e) {
        return false;
    }

    return true;
}

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From source file:com.microsoft.applicationinsights.web.internal.cookies.Cookie.java

/**
 * Gets the cookie from the given http request.
 * @param eClass The required cookie type.
 * @param request THe http request to get the cookies from.
 * @param cookieName The cookie name./*from w  w  w .  ja va 2s .c o  m*/
 * @param <E> The required cookie type.
 * @return Cookie from the required type.
 */
public static <E> E getCookie(Class<E> eClass, HttpServletRequest request, String cookieName) {
    javax.servlet.http.Cookie[] cookies = request.getCookies();

    if (cookies == null) {
        return null;
    }

    javax.servlet.http.Cookie httpCookie = null;
    for (javax.servlet.http.Cookie cookie : cookies) {
        if (cookie.getName().equals(cookieName)) {
            httpCookie = cookie;
        }
    }

    if (httpCookie == null) {

        // Http cookie hasn't been found.
        return null;
    }

    E instance = null;
    try {
        instance = eClass.getConstructor(javax.servlet.http.Cookie.class).newInstance(httpCookie);
    } catch (Exception e) {
        InternalLogger.INSTANCE.error("Failed to create %s cookie with error: %s", cookieName, e.getMessage());
    }

    return instance;
}

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From source file:eu.stratosphere.nephele.profiling.ProfilingUtils.java

/**
 * Creates an instance of the job manager's profiling component.
 * //  w w w . j  a  v  a2  s.  c  o  m
 * @param profilerClassName
 *        the class name of the profiling component to load
 * @param jobManagerBindAddress
 *        the address the job manager's RPC server is bound to
 * @return an instance of the job manager profiling component or <code>null</code> if an error occurs
 */
@SuppressWarnings("unchecked")
public static JobManagerProfiler loadJobManagerProfiler(String profilerClassName,
        InetAddress jobManagerBindAddress) {

    final Class<? extends JobManagerProfiler> profilerClass;
    try {
        profilerClass = (Class<? extends JobManagerProfiler>) Class.forName(profilerClassName);
    } catch (ClassNotFoundException e) {
        LOG.error("Cannot find class " + profilerClassName + ": " + StringUtils.stringifyException(e));
        return null;
    }

    JobManagerProfiler profiler = null;

    try {

        final Constructor<JobManagerProfiler> constr = (Constructor<JobManagerProfiler>) profilerClass
                .getConstructor(InetAddress.class);
        profiler = constr.newInstance(jobManagerBindAddress);

    } catch (InvocationTargetException e) {
        LOG.error("Cannot create profiler: " + StringUtils.stringifyException(e));
        return null;
    } catch (NoSuchMethodException e) {
        LOG.error("Cannot create profiler: " + StringUtils.stringifyException(e));
        return null;
    } catch (InstantiationException e) {
        LOG.error("Cannot create profiler: " + StringUtils.stringifyException(e));
        return null;
    } catch (IllegalAccessException e) {
        LOG.error("Cannot create profiler: " + StringUtils.stringifyException(e));
        return null;
    } catch (IllegalArgumentException e) {
        LOG.error("Cannot create profiler: " + StringUtils.stringifyException(e));
        return null;
    }

    return profiler;
}

---

From source file:com.puppycrawl.tools.checkstyle.utils.CommonUtil.java

/**
 * Gets constructor of targetClass.//from w  ww  .j  a  v a2 s .  c  om
 * @param targetClass
 *            from which constructor is returned
 * @param parameterTypes
 *            of constructor
 * @param <T> type of the target class object.
 * @return constructor of targetClass or {@link IllegalStateException} if any exception occurs
 * @see Class#getConstructor(Class[])
 */
public static <T> Constructor<T> getConstructor(Class<T> targetClass, Class<?>... parameterTypes) {
    try {
        return targetClass.getConstructor(parameterTypes);
    } catch (NoSuchMethodException ex) {
        throw new IllegalStateException(ex);
    }
}

---

From source file:org.appverse.web.framework.backend.api.converters.helpers.ConverterUtils.java

/**
 * Creates target bean of targetClass type copying source properties to ones
 * with the same name at target. Beans and collections are copied as
 * detached objects to allow lazy initialization.
 * // ww w. ja v  a 2s .  co  m
 * @param source
 *            Source Bean to copy
 * @param targetClass
 *            Type of target bean to generate
 * @param converters
 *            List of conveters of child bean properties
 * @return Target bean of targetClass type with source data converted
 * @throws Exception
 */
public static <TargetBean extends AbstractBean> TargetBean convert(AbstractBean source,
        Class<TargetBean> targetClass, IBeanConverter[] converters) throws Exception {

    // If source bean is null return null target bean
    if (source == null) {
        return null;
    }

    // Create target bean using target class default constructor
    Constructor<TargetBean> constructor = targetClass.getConstructor(new Class[] {});
    TargetBean target = constructor.newInstance(new Object[] {});

    // Obtain source fields (including inherited fields)
    Field[] sourceFields = getBeanFields(source);

    // Call class methods to copy simple properties, bean properties and
    // collection properties
    ConverterUtils.copyPlainFields(source, target, sourceFields);
    ConverterUtils.convertBeanFields(source, target, converters, sourceFields);
    ConverterUtils.convertBeanCollectionFields(source, target, converters, sourceFields);

    return target;
}

---

From source file:Main.java

/**
 * Checks whether objects of the given class can be converted to the specified
 * type./*w  w w  . ja  v a2 s  .c  o  m*/
 * 
 * @see #convert(Object, Class)
 */
public static boolean canConvert(final Class<?> c, final Class<?> type) {
    // ensure type is well-behaved, rather than a primitive type
    final Class<?> saneType = getNonprimitiveType(type);

    // OK if the existing object can be casted
    if (canCast(c, saneType))
        return true;

    // OK if string
    if (saneType == String.class)
        return true;

    // OK if source type is string and destination type is character
    // (in this case, the first character of the string would be used)
    if (String.class.isAssignableFrom(c) && saneType == Character.class) {
        return true;
    }

    // OK if appropriate wrapper constructor exists
    try {
        saneType.getConstructor(c);
        return true;
    } catch (final Exception exc) {
        // no known way to convert
        return false;
    }
}

---

From source file:io.apiman.manager.api.micro.ManagerApiMicroServiceCdiFactory.java

/**
 * Creates a custom component from a loaded class.
 * @param componentType/*ww  w .  ja v  a  2  s.co  m*/
 * @param componentClass
 * @param configProperties
 */
@SuppressWarnings("unchecked")
private static <T> T createCustomComponent(Class<T> componentType, Class<?> componentClass,
        Map<String, String> configProperties) throws Exception {
    if (componentClass == null) {
        throw new IllegalArgumentException("Invalid component spec (class not found)."); //$NON-NLS-1$
    }
    try {
        Constructor<?> constructor = componentClass.getConstructor(Map.class);
        return (T) constructor.newInstance(configProperties);
    } catch (Exception e) {
    }
    return (T) componentClass.getConstructor().newInstance();
}

---

From source file:de.kp.ames.web.function.domain.JsonBusinessProvider.java

/**
 * @param jaxrHandle//from  ww  w .ja  v a  2 s  . c  o m
 * @param objectName
 * @return
 */
private static IJsonRegistryObject createJsonObjectForName(JaxrHandle jaxrHandle, String objectName)
        throws Exception {

    String MODUL_PACKAGE = "de.kp.ames.web.function.domain.model";
    Class<?> clazz = Class.forName(MODUL_PACKAGE + "." + objectName);
    Constructor<?> constructor = clazz.getConstructor(JaxrHandle.class);

    Object instance = constructor.newInstance(jaxrHandle);
    return (IJsonRegistryObject) instance;

}

---

From source file:lucee.transformer.bytecode.reflection.ASMProxyFactory.java

private static ASMMethod newInstance(Class<?> asmClass, Class<?> decClass, Class[] params)
        throws InstantiationException, IllegalAccessException, IllegalArgumentException,
        InvocationTargetException, SecurityException, NoSuchMethodException {
    Constructor<ASMMethod> constr = (Constructor<ASMMethod>) asmClass
            .getConstructor(new Class[] { Class.class, Class[].class });
    return constr.newInstance(new Object[] { decClass, params });

    //return (ASMMethod) asmClass.newInstance();
}

---

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

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

---

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