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:com.actionbarsherlock.ActionBarSherlock.java

/**
 * Wrap an activity with an action bar abstraction which will enable the
 * use of a custom implementation on platforms where a native version does
 * not exist./*from w ww.j  a  v a2  s.co  m*/
 *
 * @param activity Owning activity.
 * @param flags Option flags to control behavior.
 * @return Instance to interact with the action bar.
 */
public static ActionBarSherlock wrap(Activity activity, int flags) {
    //Create a local implementation map we can modify
    HashMap<Implementation, Class<? extends ActionBarSherlock>> impls = new HashMap<Implementation, Class<? extends ActionBarSherlock>>(
            IMPLEMENTATIONS);
    boolean hasQualfier;

    /* DPI FILTERING */
    hasQualfier = false;
    for (Implementation key : impls.keySet()) {
        //Only honor TVDPI as a specific qualifier
        if (key.dpi() == DisplayMetrics.DENSITY_TV) {
            hasQualfier = true;
            break;
        }
    }
    if (hasQualfier) {
        final boolean isTvDpi = activity.getResources()
                .getDisplayMetrics().densityDpi == DisplayMetrics.DENSITY_TV;
        for (Iterator<Implementation> keys = impls.keySet().iterator(); keys.hasNext();) {
            int keyDpi = keys.next().dpi();
            if ((isTvDpi && keyDpi != DisplayMetrics.DENSITY_TV)
                    || (!isTvDpi && keyDpi == DisplayMetrics.DENSITY_TV)) {
                keys.remove();
            }
        }
    }

    /* API FILTERING */
    hasQualfier = false;
    for (Implementation key : impls.keySet()) {
        if (key.api() != Implementation.DEFAULT_API) {
            hasQualfier = true;
            break;
        }
    }
    if (hasQualfier) {
        final int runtimeApi = Build.VERSION.SDK_INT;
        int bestApi = 0;
        for (Iterator<Implementation> keys = impls.keySet().iterator(); keys.hasNext();) {
            int keyApi = keys.next().api();
            if (keyApi > runtimeApi) {
                keys.remove();
            } else if (keyApi > bestApi) {
                bestApi = keyApi;
            }
        }
        for (Iterator<Implementation> keys = impls.keySet().iterator(); keys.hasNext();) {
            if (keys.next().api() != bestApi) {
                keys.remove();
            }
        }
    }

    if (impls.size() > 1) {
        throw new IllegalStateException("More than one implementation matches configuration.");
    }
    if (impls.isEmpty()) {
        throw new IllegalStateException("No implementations match configuration.");
    }
    Class<? extends ActionBarSherlock> impl = impls.values().iterator().next();
    if (DEBUG)
        Log.i(TAG, "Using implementation: " + impl.getSimpleName());

    try {
        Constructor<? extends ActionBarSherlock> ctor = impl.getConstructor(CONSTRUCTOR_ARGS);
        return ctor.newInstance(activity, flags);
    } catch (NoSuchMethodException e) {
        throw new RuntimeException(e);
    } catch (IllegalArgumentException e) {
        throw new RuntimeException(e);
    } catch (InstantiationException e) {
        throw new RuntimeException(e);
    } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
    } catch (InvocationTargetException e) {
        throw new RuntimeException(e);
    }
}

---

From source file:au.com.borner.salesforce.client.rest.domain.AbstractJSONObject.java

@SuppressWarnings("unchecked")
protected <T extends AbstractJSONObject> List<T> getChildEntities(String name, Class<T> resultClass) {
    try {//from  ww w  . j ava  2s . c  om
        Constructor<T> constructor = resultClass.getConstructor(String.class);
        JSONArray children = getJSONArray(name);
        List<T> result = new ArrayList<T>(children.length());
        for (int i = 0; i < children.length(); i++) {
            JSONObject jsonObject = children.getJSONObject(i);
            T instance = constructor.newInstance(jsonObject.toString()); // is there any way to avoid double serialisation?
            result.add(instance);
        }
        return result;
    } catch (Exception e) {
        throw new RuntimeException("Error parsing child elements", e);
    }
}

---

From source file:com.github.dpsm.android.print.gson.GsonResultOperator.java

/**
 * Creates an instance of the operator for the specified target class type that uses the
 * specified Gson instance to de-serialize.
 *
 * @param gson  the Gson instance to use for de-serialization.
 * @param clazz the target type to convert to.
 *//*from w ww  .  j av  a  2 s. co  m*/
public GsonResultOperator(final Gson gson, final Class<T> clazz) {
    try {
        mConstructor = clazz.getConstructor(JsonObject.class);
    } catch (NoSuchMethodException e) {
        throw new IllegalArgumentException(e);
    }

    mClass = clazz;
    mGSON = gson;
}

---

From source file:com.aerospike.config.AppConfiguration.java

public AppConfiguration() throws CloudFoundryEnvironmentException {
    CloudFoundryEnvironment environment = new CloudFoundryEnvironment(System::getenv);

    if (environment.getServiceNames().size() > 0) {
        for (String serviceName : environment.getServiceNames()) {
            System.out.println("SERVICE NAME: " + serviceName);
            CloudFoundryService service = environment.getService(serviceName);
            if (labelToConfigurationClass.containsKey(service.getLabel())) {
                String className = labelToConfigurationClass.get(service.getLabel());
                try {
                    Class<?> clazz = Class.forName(className);
                    Constructor<?> constructor = clazz.getConstructor(Map.class);
                    IServiceConfiguration config = (IServiceConfiguration) constructor
                            .newInstance(environment.getService(serviceName).getCredentials());
                    services.put(serviceName, config);
                    System.out.println("ADDED CLASS : " + className);
                } catch (Exception e) {
                    e.printStackTrace();
                    System.out.println("Error creating class " + className);
                }/*from w  ww .jav a 2 s. co  m*/
            }
        }
    }
}

---

From source file:com.fatminds.cmis.AlfrescoCmisHelper.java

public static Object convert(Object inVal, Class<?> outClass) {
    if (null == inVal || null == outClass) {
        //log.info("inVal " + inVal + " or outClass " + outClass + " are null");
        return null;
    }//from w  ww  .  j a  v a 2 s.c  om
    //log.info("Converting " + inVal.getClass() + " to " + outClass);
    if (outClass.isAssignableFrom(inVal.getClass()))
        return inVal;

    Object outVal;
    try {
        Constructor<?> c = outClass.getConstructor(inVal.getClass());
        outVal = c.newInstance(inVal);
    } catch (SecurityException e) {
        throw new RuntimeException(e);
    } catch (NoSuchMethodException e) {
        //log.info("Failed to find constructor of " + outClass.toString() 
        //      + " with input parameter " + inVal.getClass().toString()
        //      + ", returning unconverted value");
        outVal = inVal;
    } catch (IllegalArgumentException e) {
        throw new RuntimeException(e);
    } catch (InstantiationException e) {
        throw new RuntimeException(e);
    } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
    } catch (InvocationTargetException e) {
        throw new RuntimeException(e);
    }
    //log.info("Returning an instance of " + outVal.getClass());
    return outVal;
}

---

From source file:com.github.dpsm.android.print.jackson.JacksonResultOperator.java

/**
 * Creates an instance of the operator for the specified target class type that uses the
 * specified ObjectMapper instance to de-serialize.
 *
 * @param mapper the ObjectMapper instance to use for de-serialization.
 * @param clazz the target type to convert to.
 *//*from  ww  w . j a va 2 s. c o  m*/
public JacksonResultOperator(final ObjectMapper mapper, final Class<T> clazz) {
    try {
        mConstructor = clazz.getConstructor(ObjectNode.class);
    } catch (NoSuchMethodException e) {
        throw new IllegalArgumentException(e);
    }

    mClass = clazz;
    mMapper = mapper;
}

---

From source file:com.all.shared.sync.SyncGenericConverter.java

private static Object readValue(String attributeName, Class<?> clazz, Map<String, Object> map)
        throws IllegalArgumentException, SecurityException, InstantiationException, IllegalAccessException,
        InvocationTargetException, NoSuchMethodException {
    Object value = map.get(attributeName);
    if (value != null && !clazz.equals(value.getClass())) {
        if (clazz.equals(Date.class) && StringUtils.isNumeric(value.toString())) {
            return new Date(new Long(value.toString()));
        }//from   w  w  w  .  j  a v a2  s . c o  m
        if (clazz.isEnum() && value instanceof String) {
            for (Object enumType : clazz.getEnumConstants()) {
                if (value.equals(enumType.toString())) {
                    return enumType;
                }
            }
        }
        if (PRIMITIVES.contains(clazz)) {
            return clazz.getConstructor(String.class).newInstance(value.toString());
        }
    }
    return value;
}

---

From source file:com.seovic.core.Defaults.java

/**
 * Gets a constructor for the specified class that accepts a single String
 * argument.//from w w  w .  j av  a  2s .c  om
 *
 * @param type  the class to find the constructor for
 *
 * @return a constructor for the specified class that accepts a single
 *         String argument
 */
protected Constructor getConstructor(Class type) {
    try {
        return type.getConstructor(String.class);
    } catch (NoSuchMethodException e) {
        throw new RuntimeException("Unable to find a constructor that accepts"
                + " a single String argument in the " + type.getName() + " class.", e);
    }
}

---

From source file:hudson.jbpm.model.TaskInstanceWrapper.java

public Object getForm() {
    TaskInstance ti = getTaskInstance();
    try {//ww  w .  j  a va2s. c  om
        ClassLoader processClassLoader = ProcessClassLoaderCache.INSTANCE
                .getClassLoader(ti.getProcessInstance().getProcessDefinition());
        String formClass = (String) ti.getVariableLocally("form");
        if (formClass == null) {
            return new Form(ti);
        } else {
            Class<?> cl = processClassLoader.loadClass(formClass);
            return cl.getConstructor(TaskInstance.class).newInstance(ti);
        }
    } catch (InvocationTargetException e) {
        throw new RuntimeException(e.getCause());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

}

---

From source file:jetbrains.buildServer.server.rest.util.BeanFactory.java

@Nullable
private <T> Constructor<T> findConstructor(@NotNull final Class<T> clazz, Class<?>[] argTypes) {
    try {/* w ww.j  a v a2 s.co m*/
        return clazz.getConstructor(argTypes);
    } catch (NoSuchMethodException e) {
        //NOP
    }

    for (Constructor c : clazz.getConstructors()) {
        final Class[] reqTypes = c.getParameterTypes();
        if (checkParametersMatch(argTypes, reqTypes)) {
            //noinspection unchecked
            return (Constructor<T>) c;
        }
    }
    return null;
}

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