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.github.dozermapper.core.converters.StringConstructorConverter.java

public Object convert(Class destClass, Object srcObj) {
    String result = (String) stringConverter.convert(destClass, srcObj);
    try {/*from  w  w  w  .j  a v  a 2  s  . co  m*/
        Constructor constructor = destClass.getConstructor(String.class); // TODO Check, but not catch
        return constructor.newInstance(result);
    } catch (NoSuchMethodException e) {
        // just return the string
        return result;
    } catch (Exception e) {
        throw new ConversionException(e);
    }
}

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From source file:org.malaguna.cmdit.service.CommandRunner.java

/**
 * Dada una clase de un comando, instancia el mismo apropiadamente 
 * //from   w  w w.j a  v  a 2 s . c o  m
 * @param clazz
 * @return
 */
protected Command createCommand(Class<? extends Command> clazz) {
    Command comand = null;

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

    return comand;
}

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From source file:com.bskyb.cg.environments.message.MessageFormatFactory.java

private Object newInstance(String logFormat, Class<?>[] paramTypes, Object[] params) {
    Object obj = null;//from  w w  w. j av a2 s  . co  m
    String classname = logFormat;

    try {
        Class<?> cls = classes.get(classname);

        if (cls == null) {
            throw new RuntimeException("No class registered under " + logFormat);
        }

        Constructor<?> ctor = cls.getConstructor(paramTypes);
        obj = ctor.newInstance(params);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return obj;
}

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From source file:com.comcast.drivethru.utils.Method.java

/**
 * Get a new instance of the appropriate Apache HTTP request object for this HTTP method and
 * pass it the given URL.//from  ww  w. j a  v  a2s. c o m
 *
 * @param url
 *            the URL to pass into the constructor of the request object
 *
 * @return a new instance of the appropriate Apache HTTP request object for this HTTP method
 *
 * @throws HttpException
 *             if the request object could not be created
 */
public HttpRequestBase getRequest(String url) throws HttpException {
    try {
        Constructor<? extends HttpRequestBase> constructor = type.getConstructor(String.class);
        return constructor.newInstance(url);
    } catch (Exception ex) {
        throw new HttpException("Failed to create an RestRequest", ex);
    }
}

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From source file:com.adaptris.core.management.config.ConfigManagerImpl.java

private AdapterRegistryMBean createCustomRegistry() throws CoreException {
    AdapterRegistryMBean result = null;//  w  w w.j av  a2 s . co m
    String classname = System.getProperty(ADAPTER_REGISTRY_IMPL);
    Class[] paramTypes = { BootstrapProperties.class };
    Object[] args = { bootstrapProperties };

    Class clazz;
    try {
        clazz = Class.forName(classname);
        Constructor cnst = clazz.getDeclaredConstructor(paramTypes);
        result = (AdapterRegistryMBean) cnst.newInstance(args);
    } catch (Exception e) {
        ExceptionHelper.rethrowCoreException(e);
    }
    return result;
}

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From source file:mojo.view.rest.DataController.java

@ResponseBody
@RequestMapping(value = "/select-view", method = RequestMethod.GET)
public DataPage<?> doFetchView(@RequestBody Select<E> spec, @RequestParam String view) {
    try {/*from  w w w .  jav a 2s.c o  m*/
        DataPage<E> page = service.select(spec);
        List<Object> views = new ArrayList<Object>(page.getData().size());
        Class<?> viewClass = Class.forName(view);

        for (E entity : page.getData()) {
            Class<?> entityClass = entity.getClass();
            Constructor<?> viewConstructor = viewClass.getConstructor(entityClass);
            Object obj = viewConstructor.newInstance(entity);
            views.add(obj);
        }

        DataPage<Object> result = new DataPage<Object>();
        result.setTotal(page.getTotal());
        result.setData(views);
        return result;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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From source file:iristk.util.Record.java

private static Record parseJsonObject(JsonObject json) throws JsonToRecordException {
    try {//from   w w w. jav a2s.c om
        Record record;
        if (json.get("class") != null) {
            Constructor<?> constructor = Class.forName(json.get("class").asString()).getDeclaredConstructor();
            constructor.setAccessible(true);
            record = (Record) constructor.newInstance(null);
        } else {
            record = new Record();
        }
        for (String name : json.names()) {
            if (!name.equals("class")) {
                JsonValue jvalue = json.get(name);
                record.put(name, parseJsonValue(jvalue));
            }
        }
        //System.out.println(json + " " + record);
        return record;
    } catch (ClassNotFoundException e) {
        throw new JsonToRecordException("Class not found: " + e.getMessage());
    } catch (InstantiationException e) {
        throw new JsonToRecordException("Could not create: " + e.getMessage());
    } catch (IllegalAccessException e) {
        throw new JsonToRecordException("Could not access: " + e.getMessage());
    } catch (IllegalArgumentException e) {
        throw new JsonToRecordException("Illegal argument: " + e.getMessage());
    } catch (InvocationTargetException e) {
        throw new JsonToRecordException("Invocation problem: " + e.getMessage());
    } catch (NoSuchMethodException e) {
        throw new JsonToRecordException("No such method: " + e.getMessage());
    } catch (SecurityException e) {
        throw new JsonToRecordException("Securiry problem: " + e.getMessage());
    }
}

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From source file:com.soomla.util.JSONFactory.java

public T create(JSONObject jsonObject, String packageName) {

    if (jsonObject == null) {
        // warn/*from   w  ww. ja  v a 2  s  . c  om*/
        return null;
    }

    T t = null;
    try {
        //            SoomlaUtils.LogDebug(TAG, jsonObject.toString());
        String className = jsonObject.getString(com.soomla.data.JSONConsts.SOOM_CLASSNAME);
        Class<? extends T> clazz = (Class<? extends T>) Class.forName(packageName + "." + className);
        SoomlaUtils.LogDebug(TAG, "creating with: " + packageName + "." + className);
        if (clazz != null) {
            final Constructor<? extends T> jsonCtor = clazz.getDeclaredConstructor(JSONObject.class);
            t = jsonCtor.newInstance(jsonObject);
        } else {
            SoomlaUtils.LogError(TAG, "unknown class name:" + className);
        }

    } catch (JSONException e) {
        SoomlaUtils.LogError(TAG, "fromJSONObject JSONException:" + e.getMessage());
    } catch (InstantiationException e) {
        SoomlaUtils.LogError(TAG, "fromJSONObject InstantiationException:" + e.getMessage());
    } catch (IllegalAccessException e) {
        SoomlaUtils.LogError(TAG, "fromJSONObject IllegalAccessException:" + e.getMessage());
    } catch (NoSuchMethodException e) {
        SoomlaUtils.LogError(TAG, "fromJSONObject no JSONObject constructor found:" + e.getMessage());
    } catch (InvocationTargetException e) {
        SoomlaUtils.LogError(TAG, "fromJSONObject InvocationTargetException:" + e.getMessage());
        SoomlaUtils.LogError(TAG, "fromJSONObject InvocationTargetException[cause]:" + e.getCause());
    } catch (ClassNotFoundException e) {
        SoomlaUtils.LogError(TAG, "fromJSONObject ClassNotFoundException:" + e.getMessage());
    }

    return t;
}

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From source file:it.cnr.icar.eric.server.plugin.AbstractPluginManager.java

/**
* Creates the instance of the pluginClass
*///from  w ww  . j  a va2 s  .c o m
protected Object createPluginInstance(String pluginClass) throws Exception {
    Object plugin = null;

    if (log.isDebugEnabled()) {
        log.debug("pluginClass = " + pluginClass);
    }

    if (pluginClass != null) {
        Class<?> theClass = Class.forName(pluginClass);

        //try to invoke zero arg constructor using Reflection, 
        //if this fails then try invoking getInstance()
        try {
            Constructor<?> constructor = theClass.getConstructor((java.lang.Class[]) null);
            plugin = constructor.newInstance(new Object[0]);
        } catch (Exception e) {
            Method factory = theClass.getDeclaredMethod("getInstance", (java.lang.Class[]) null);
            plugin = factory.invoke((java.lang.Class[]) null, new Object[0]);
        }
    }
    return plugin;
}

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From source file:com.xpn.xwiki.plugin.charts.plots.TimePlotFactory.java

public Plot create(DataSource dataSource, ChartParams params) throws GenerateException, DataSourceException {

    Class rendererClass = params.getClass(ChartParams.RENDERER);
    XYItemRenderer renderer;/*w  w w .ja  v a2s .c  o m*/
    if (rendererClass != null) {
        try {
            Constructor ctor = rendererClass.getConstructor(new Class[] {});
            renderer = (XYItemRenderer) ctor.newInstance(new Object[] {});
        } catch (Throwable e) {
            throw new GenerateException(e);
        }
    } else {
        renderer = new XYLineAndShapeRenderer();
    }
    ChartCustomizer.customizeXYItemRenderer(renderer, params);

    DateAxis domainAxis = new DateAxis();
    ChartCustomizer.customizeDateAxis(domainAxis, params, ChartParams.AXIS_DOMAIN_PREFIX);

    NumberAxis rangeAxis = new NumberAxis();
    rangeAxis.setAutoRangeIncludesZero(false); // override default
    ChartCustomizer.customizeNumberAxis(rangeAxis, params, ChartParams.AXIS_RANGE_PREFIX);

    XYDataset dataset = TimeSeriesCollectionFactory.getInstance().create(dataSource, params);

    XYPlot plot = new XYPlot(dataset, domainAxis, rangeAxis, renderer);

    ChartCustomizer.customizeXYPlot(plot, params);

    return plot;
}

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