Class DefaultBeanFactory
- java.lang.Object
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- org.apache.commons.configuration2.beanutils.DefaultBeanFactory
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- All Implemented Interfaces:
BeanFactory
public class DefaultBeanFactory extends java.lang.Object implements BeanFactory
The default implementation of the
BeanFactory
interface.This class creates beans of arbitrary types using reflection. Each time the
createBean()
method is invoked, a new bean instance is created. A default bean class is not supported.For data type conversions (which may be needed before invoking methods through reflection to ensure that the current parameters match their declared types) a
ConversionHandler
object is used. An instance of this class can be passed to the constructor. Alternatively, a defaultConversionHandler
instance is used.An instance of this factory class will be set as the default bean factory for the
BeanHelper
class. This means that if not bean factory is specified in aBeanDeclaration
, this default instance will be used.- Since:
- 1.3
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Field Summary
Fields Modifier and Type Field Description static DefaultBeanFactory
INSTANCE
Stores the default instance of this class.
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Constructor Summary
Constructors Constructor Description DefaultBeanFactory()
Creates a new instance ofDefaultBeanFactory
using a defaultConversionHandler
.DefaultBeanFactory(ConversionHandler convHandler)
Creates a new instance ofDefaultBeanFactory
using the specifiedConversionHandler
for data type conversions.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
createBean(BeanCreationContext bcc)
Creates a new bean instance.protected java.lang.Object
createBeanInstance(BeanCreationContext bcc)
Creates the bean instance.protected static <T> java.lang.reflect.Constructor<T>
findMatchingConstructor(java.lang.Class<T> beanClass, BeanDeclaration data)
Evaluates constructor arguments in the specifiedBeanDeclaration
and tries to find a unique matching constructor.ConversionHandler
getConversionHandler()
Returns theConversionHandler
used by this object.java.lang.Class<?>
getDefaultBeanClass()
Returns the default bean class used by this factory.protected void
initBeanInstance(java.lang.Object bean, BeanCreationContext bcc)
Initializes the newly created bean instance.
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Field Detail
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INSTANCE
public static final DefaultBeanFactory INSTANCE
Stores the default instance of this class.
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Constructor Detail
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DefaultBeanFactory
public DefaultBeanFactory()
Creates a new instance ofDefaultBeanFactory
using a defaultConversionHandler
.
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DefaultBeanFactory
public DefaultBeanFactory(ConversionHandler convHandler)
Creates a new instance ofDefaultBeanFactory
using the specifiedConversionHandler
for data type conversions.- Parameters:
convHandler
- theConversionHandler
; can be null, then a default handler is used- Since:
- 2.0
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Method Detail
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getConversionHandler
public ConversionHandler getConversionHandler()
Returns theConversionHandler
used by this object.- Returns:
- the
ConversionHandler
- Since:
- 2.0
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createBean
public java.lang.Object createBean(BeanCreationContext bcc) throws java.lang.Exception
Creates a new bean instance. This implementation delegates to the protected methodscreateBeanInstance()
andinitBeanInstance()
for creating and initializing the bean. This makes it easier for derived classes that need to change specific functionality of the base class.- Specified by:
createBean
in interfaceBeanFactory
- Parameters:
bcc
- the context object defining the bean to be created- Returns:
- the new bean instance
- Throws:
java.lang.Exception
- if an error occurs
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getDefaultBeanClass
public java.lang.Class<?> getDefaultBeanClass()
Returns the default bean class used by this factory. This is always null for this implementation.- Specified by:
getDefaultBeanClass
in interfaceBeanFactory
- Returns:
- the default bean class
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createBeanInstance
protected java.lang.Object createBeanInstance(BeanCreationContext bcc) throws java.lang.Exception
Creates the bean instance. This method is called bycreateBean()
. It uses reflection to create a new instance of the specified class.- Parameters:
bcc
- the context object defining the bean to be created- Returns:
- the new bean instance
- Throws:
java.lang.Exception
- if an error occurs
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initBeanInstance
protected void initBeanInstance(java.lang.Object bean, BeanCreationContext bcc) throws java.lang.Exception
Initializes the newly created bean instance. This method is called bycreateBean()
. It calls theinitBean()
method of the context object for performing the initialization.- Parameters:
bean
- the newly created bean instancebcc
- the context object defining the bean to be created- Throws:
java.lang.Exception
- if an error occurs
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findMatchingConstructor
protected static <T> java.lang.reflect.Constructor<T> findMatchingConstructor(java.lang.Class<T> beanClass, BeanDeclaration data)
Evaluates constructor arguments in the specifiedBeanDeclaration
and tries to find a unique matching constructor. If this is not possible, an exception is thrown. Note: This method is intended to be used by concreteBeanFactory
implementations and not by client code.- Type Parameters:
T
- the type of the bean to be created- Parameters:
beanClass
- the class of the bean to be createddata
- the currentBeanDeclaration
- Returns:
- the single matching constructor
- Throws:
ConfigurationRuntimeException
- if no single matching constructor can be foundjava.lang.NullPointerException
- if the bean class or bean declaration are null
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