stream.runtime.setup

Class ParameterInjection

java.lang.Object

stream.runtime.setup.ParameterInjection

public class ParameterInjection
extends Object

This class provides some utility methods for injecting parameters into an object by the use of Java's reflection API.

Author:

Christian Bockermann <chris@jwall.org>

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static org.slf4j.Logger	log

Constructor Summary

Constructors

Constructor and Description
ParameterInjection()

Method Summary

Modifier and Type	Method and Description
private static void	checkForMissingParametersAndSetters(Object o, Map<String,?> params, Set<String> skip) This methods checks for the XMLParameter annotation in the processor and if the corresponindg parameters or setter methods are missing.
static Map<String,String>	extract(Object learner)
static boolean	hasGetter(Class<?> clazz, String name)
static Set<String>	inject(Object o, Map<String,?> params, Variables variableContext) This method injects a set of parameters to the given object.
static void	injectSystemProperties(Object object, String prefix)
static boolean	isGetter(Method m)
static boolean	isNativeType(Class<?> clazz)
static boolean	isQueueArraySetter(Method m)
static boolean	isQueueSetter(Method m)
static boolean	isTypeSupported(Class<?> clazz)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log

static org.slf4j.Logger log

Constructor Detail

ParameterInjection

public ParameterInjection()

Method Detail

inject

public static Set<String> inject(Object o,
                                 Map<String,?> params,
                                 Variables variableContext)
                          throws Exception

This method injects a set of parameters to the given object.

Parameters:

o - The object to inject parameters into.

params - The parameters to set on the object.

Returns:

Returns the parameter key that have been set using this method.

Throws:

Exception

checkForMissingParametersAndSetters

private static void checkForMissingParametersAndSetters(Object o,
                                                        Map<String,?> params,
                                                        Set<String> skip)
                                                 throws ParameterException

This methods checks for the XMLParameter annotation in the processor and if the corresponindg parameters or setter methods are missing. A new ParameterException will be thrown in both cases

Parameters:

o - the processor instance

params - the params map from the xml file

Throws:

ParameterException - in case parameter or setter is missing

injectSystemProperties

public static void injectSystemProperties(Object object,
                                          String prefix)
                                   throws Exception

Throws:

Exception

extract

public static Map<String,String> extract(Object learner)
                                  throws Exception

Throws:

Exception

isGetter

public static boolean isGetter(Method m)

hasGetter

public static boolean hasGetter(Class<?> clazz,
                                String name)

isTypeSupported

public static boolean isTypeSupported(Class<?> clazz)

isNativeType

public static boolean isNativeType(Class<?> clazz)

isQueueSetter

public static boolean isQueueSetter(Method m)

isQueueArraySetter

public static boolean isQueueArraySetter(Method m)