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.isencia.passerelle.message.type.ComplexConverter.java

protected Object convertTokenToContent(Token typedToken, Class targetType) throws MessageException {
    Complex cVal = ((ComplexToken) typedToken).complexValue();
    if (targetType != null && !Complex.class.equals(targetType)) {
        if (String.class.equals(targetType)) {
            return cVal.toString();
        } else {//w w w  .jav a2 s .co m
            // only take real part
            try {
                Constructor c = targetType.getConstructor(new Class[] { String.class });
                return c.newInstance(new Object[] { Double.toString(cVal.real) });
            } catch (Exception e) {
                throw new UnsupportedOperationException();
            }
        }
    } else {
        // we just return a Complex as default,
        // if no specific target type is given
        try {
            double real = cVal.real;
            double imag = cVal.imag;
            return new Complex(real, imag);
        } catch (ClassCastException e) {
            throw new UnsupportedOperationException();
        }
    }
}

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From source file:com.netspective.sparx.navigate.NavigationTrees.java

public NavigationTree createNavigationTree(Class cls) throws NoSuchMethodException, InstantiationException,
        IllegalAccessException, InvocationTargetException {
    if (NavigationTree.class.isAssignableFrom(cls)) {
        Constructor c = cls.getConstructor(new Class[] { Project.class });
        return (NavigationTree) c.newInstance(new Object[] { project });
    } else/* w  w w  . ja v a  2 s  . c om*/
        throw new RuntimeException("Don't know what to do with with class: " + cls);
}

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From source file:net.dmulloy2.ultimatearena.api.SimpleArenaType.java

@Override
public ArenaConfig newConfig(ArenaZone az) {
    Class<? extends ArenaConfig> clazz = getArenaConfig();
    Validate.notNull(clazz, "ArenaConfig class cannot be null!");

    try {/*from w  w w  .j  av  a  2s  .com*/
        Constructor<? extends ArenaConfig> constructor = clazz.getConstructor(ArenaZone.class);
        return constructor.newInstance(az);
    } catch (InvocationTargetException ex) {
        throw new RuntimeException("Failed to create new " + clazz.getName() + " instance.", ex);
    } catch (Throwable ex) {
        throw Throwables.propagate(ex);
    }
}

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From source file:com.metadave.stow.TestStow.java

@Test
public void testGen() throws Exception {
    InputStream is = this.getClass().getResourceAsStream("/Stow.stg");
    File f = File.createTempFile("stow", "test.stg");
    String root = f.getParent();//w  w w . jav a 2s  .  c  om
    String classdir = root + File.separator + "stowtest";

    String stgPath = f.getAbsolutePath();
    String stowStg = org.apache.commons.io.IOUtils.toString(is);

    org.apache.commons.io.FileUtils.writeStringToFile(f, stowStg);

    File d = new File(classdir);
    d.mkdirs();

    Stow.generateObjects(stgPath, "stowtest", "Test", classdir);

    File testSTBean = new File(classdir + File.separator + "TestSTBean.java");
    assertTrue(testSTBean.exists());

    File testSTAccessor = new File(classdir + File.separator + "TestSTAccessor.java");
    assertTrue(testSTAccessor.exists());

    JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
    compiler.run(null, null, null, testSTBean.getAbsolutePath());
    compiler.run(null, null, null, testSTAccessor.getAbsolutePath());

    File testSTAccessorClass = new File(classdir + File.separator + "TestSTAccessor.class");
    assertTrue(testSTAccessorClass.exists());

    File testSTBeanClass = new File(classdir + File.separator + "TestSTBean.class");
    assertTrue(testSTBeanClass.exists());

    URLClassLoader classLoader = URLClassLoader.newInstance(new URL[] { new File(root).toURI().toURL() });
    Class<?> cls = Class.forName("stowtest.TestSTBean", true, classLoader);

    Constructor<?> c = cls.getConstructors()[0];
    STGroup stg = new STGroupFile(f.getAbsolutePath());
    Object o = c.newInstance(stg);

    Set<String> methods = new HashSet<String>();
    methods.add("addPackage");
    methods.add("addBeanClass");
    methods.add("addTemplateName");
    methods.add("addAccessor");

    int count = 0;
    for (Method m : o.getClass().getMethods()) {
        if (methods.contains(m.getName())) {
            count++;
        }
    }
    assertEquals("Look for 8 generated methods", 8, count);
}

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From source file:org.opendaylight.ovsdb.lib.schema.TableSchema.java

public <E extends TableSchema<E>> E as(Class<E> clazz) {
    try {//  w w  w .  j  a  v a 2s  .  c  om
        Constructor<E> instance = clazz.getConstructor(TableSchema.class);
        return instance.newInstance(this);
    } catch (Exception e) {
        throw new RuntimeException("exception constructing instance of clazz " + clazz, e);
    }
}

---

From source file:com.adaptris.core.config.DefaultPreProcessorLoader.java

private ConfigPreProcessor createInstance(String classname, KeyValuePairSet config) throws CoreException {
    ConfigPreProcessor preProcessor = null;
    log.trace("Loading pre-processor: " + classname);
    Class<?>[] paramTypes = { KeyValuePairSet.class };
    Object[] args = { config };/*  www . java  2s .c  om*/
    try {
        Class<?> clazz = Class.forName(classname);
        Constructor<?> cnst = clazz.getDeclaredConstructor(paramTypes);
        preProcessor = (ConfigPreProcessor) cnst.newInstance(args);
    } catch (Exception e) {
        throw ExceptionHelper.wrapCoreException(e);
    }
    return preProcessor;
}

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From source file:com.adaptris.core.config.DefaultPreProcessorLoader.java

private ConfigPreProcessor createInstance(String classname, BootstrapProperties bootstrapProperties)
        throws CoreException {
    ConfigPreProcessor preProcessor = null;
    log.trace("Loading pre-processor: " + classname);
    Class<?>[] paramTypes = { BootstrapProperties.class };
    Object[] args = { bootstrapProperties };
    try {//w w w  .  j a  va 2  s. c  o m
        Class<?> clazz = Class.forName(classname);
        Constructor<?> cnst = clazz.getDeclaredConstructor(paramTypes);
        preProcessor = (ConfigPreProcessor) cnst.newInstance(args);
    } catch (Exception e) {
        throw ExceptionHelper.wrapCoreException(e);
    }

    return preProcessor;
}

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From source file:com.ksc.transform.LegacyErrorUnmarshaller.java

@Override
public KscServiceException unmarshall(Node in) throws Exception {
    XPath xpath = xpath();/* w  ww .ja v  a 2 s .  c om*/
    String errorCode = parseErrorCode(in, xpath);
    String message = asString("Response/Error/Message", in, xpath);
    String requestId = asString("Response/RequestID", in, xpath);
    String errorType = asString("Response/Error/Type", in, xpath);
    if (StringUtils.isBlank(errorCode)) {
        return null;
    }
    Constructor<? extends KscServiceException> constructor = exceptionClass.getConstructor(String.class);
    KscServiceException ase = constructor.newInstance(message);
    ase.setErrorCode(errorCode);
    ase.setRequestId(requestId);

    if (errorType == null) {
        ase.setErrorType(ErrorType.Unknown);
    } else if (errorType.equalsIgnoreCase("server")) {
        ase.setErrorType(ErrorType.Service);
    } else if (errorType.equalsIgnoreCase("client")) {
        ase.setErrorType(ErrorType.Client);
    }

    return ase;
}

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From source file:com.couchbase.sqoop.manager.CouchbaseFactory.java

@Override
public ConnManager accept(JobData data) {
    SqoopOptions options = data.getSqoopOptions();

    if (null != options.getConnManagerClassName()) {
        String className = options.getConnManagerClassName();

        ConnManager connManager = null;/*from  w  ww  .  java  2  s . c  om*/
        try {
            Class<ConnManager> cls = (Class<ConnManager>) Class.forName(className);
            Constructor<ConnManager> constructor = cls.getDeclaredConstructor(SqoopOptimnbons.class);
            connManager = constructor.newInstance(options);
        } catch (Exception e) {
            System.err.println("problem finding the connection manager for class name :" + className);
            // Log the stack trace for this exception
            LOG.debug(e.getMessage(), e);
            // Print exception message.
            System.err.println(e.getMessage());
        }
        return connManager;
    }

    String connectStr = options.getConnectString();

    // java.net.URL follows RFC-2396 literally, which does not allow a ':'
    // character in the scheme component (section 3.1). JDBC connect strings,
    // however, commonly have a multi-scheme addressing system. e.g.,
    // jdbc:mysql://...; so we cannot parse the scheme component via URL
    // objects. Instead, attempt to pull out the scheme as best as we can.

    // First, see if this is of the form [scheme://hostname-and-etc..]
    int schemeStopIdx = connectStr.indexOf("//");
    if (-1 == schemeStopIdx) {
        // If no hostname start marker ("//"), then look for the right-most ':'
        // character.
        schemeStopIdx = connectStr.lastIndexOf(':');
        if (-1 == schemeStopIdx) {
            // Warn that this is nonstandard. But we should be as permissive
            // as possible here and let the ConnectionManagers themselves throw
            // out the connect string if it doesn't make sense to them.
            LOG.warn("Could not determine scheme component of connect string");

            // Use the whole string.
            schemeStopIdx = connectStr.length();
        }
    }

    String scheme = connectStr.substring(0, schemeStopIdx);

    if (null == scheme) {
        // We don't know if this is a mysql://, hsql://, etc.
        // Can't do anything with this.
        LOG.warn("Null scheme associated with connect string.");
        return null;
    }

    LOG.debug("Trying with scheme: " + scheme);

    if (scheme.equals("http:")) {
        return new CouchbaseManager(options);
    } else {
        return null;
    }
}

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From source file:es.urjc.mctwp.bbeans.AbstractBean.java

/**
 * Return new instance of command identified by clazz
 * /*from w ww  .j a  va 2s .c om*/
 * @param clase
 * @return
 */
protected Command getCommand(Class<?> clazz) {
    Command command = null;

    //Build a new command using Web Application Context (wac)
    try {
        Constructor<?> c = clazz.getConstructor(BeanFactory.class);
        command = (Command) c.newInstance(wac);
    } catch (Exception e) {
        logger.error("Error creating new command [" + clazz.toString() + "] : " + e.getMessage());
    }

    return command;
}

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