org.apache.commons.configuration

Class DefaultConfigurationBuilder.ConfigurationProvider

java.lang.Object

org.apache.commons.configuration.beanutils.DefaultBeanFactory

org.apache.commons.configuration.DefaultConfigurationBuilder.ConfigurationProvider

All Implemented Interfaces:

BeanFactory

Direct Known Subclasses:

DefaultConfigurationBuilder.FileConfigurationProvider

Enclosing class:

DefaultConfigurationBuilder

public static class DefaultConfigurationBuilder.ConfigurationProvider
extends DefaultBeanFactory

A base class for creating and initializing configuration sources.

Concrete sub classes of this base class are responsible for creating specific Configuration objects for the tags in the configuration definition file. The configuration factory will parse the definition file and try to find a matching ConfigurationProvider for each encountered tag. This provider is then asked to create a corresponding Configuration object. It is up to a concrete implementation how this object is created and initialized.

Note that at the moment only configuration classes derived from AbstractConfiguration are supported.

Field Summary

Fields inherited from class org.apache.commons.configuration.beanutils.DefaultBeanFactory

INSTANCE

Constructor Summary

Constructors

Constructor and Description
ConfigurationProvider() Creates a new uninitialized instance of ConfigurationProvider.
ConfigurationProvider(java.lang.Class<?> configClass) Creates a new instance of ConfigurationProvider and sets the class of the configuration created by this provider.
ConfigurationProvider(java.lang.String configClassName) Creates a new instance of ConfigurationProvider and sets the name of the class of the configuration created by this provider.

Method Summary

Modifier and Type	Method and Description
protected java.lang.Class<?>	fetchConfigurationClass() Returns the configuration class supported by this provider.
AbstractConfiguration	getConfiguration(DefaultConfigurationBuilder.ConfigurationDeclaration decl) Returns the configuration.
java.lang.Class<?>	getConfigurationClass() Returns the class of the configuration returned by this provider.
java.lang.String	getConfigurationClassName() Returns the name of the configuration class returned by this provider.
AbstractConfiguration	getEmptyConfiguration(DefaultConfigurationBuilder.ConfigurationDeclaration decl) Returns an uninitialized configuration of the represented type.
protected java.lang.Class<?>	loadClass(java.lang.String className) Loads the class with the specified name dynamically.
void	setConfigurationClass(java.lang.Class<?> configurationClass) Sets the class of the configuration returned by this provider.
void	setConfigurationClassName(java.lang.String configurationClassName) Sets the name of the configuration class returned by this provider.

Methods inherited from class org.apache.commons.configuration.beanutils.DefaultBeanFactory

createBean, createBeanInstance, getDefaultBeanClass, initBeanInstance

Methods inherited from class java.lang.Object

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

Constructor Detail

ConfigurationProvider

public ConfigurationProvider()

Creates a new uninitialized instance of ConfigurationProvider.

ConfigurationProvider

public ConfigurationProvider(java.lang.Class<?> configClass)

Creates a new instance of ConfigurationProvider and sets the class of the configuration created by this provider.

Parameters:

configClass - the configuration class

ConfigurationProvider

public ConfigurationProvider(java.lang.String configClassName)

Creates a new instance of ConfigurationProvider and sets the name of the class of the configuration created by this provider.

Parameters:

configClassName - the name of the configuration class

Since:

1.4

Method Detail

getConfigurationClass

public java.lang.Class<?> getConfigurationClass()

Returns the class of the configuration returned by this provider.

Returns:

the class of the provided configuration

setConfigurationClass

public void setConfigurationClass(java.lang.Class<?> configurationClass)

Sets the class of the configuration returned by this provider.

Parameters:

configurationClass - the configuration class

getConfigurationClassName

public java.lang.String getConfigurationClassName()

Returns the name of the configuration class returned by this provider.

Returns:

the configuration class name

Since:

1.4

setConfigurationClassName

public void setConfigurationClassName(java.lang.String configurationClassName)

Sets the name of the configuration class returned by this provider.

Parameters:

configurationClassName - the name of the configuration class

Since:

1.4

getConfiguration

public AbstractConfiguration getConfiguration(DefaultConfigurationBuilder.ConfigurationDeclaration decl)
                                       throws java.lang.Exception

Returns the configuration. This method is called to fetch the configuration from the provider. This implementation will call the inherited createBean() method to create a new instance of the configuration class.

Parameters:

decl - the bean declaration with initialization parameters for the configuration

Returns:

the new configuration object

Throws:

java.lang.Exception - if an error occurs

getEmptyConfiguration

public AbstractConfiguration getEmptyConfiguration(DefaultConfigurationBuilder.ConfigurationDeclaration decl)
                                            throws java.lang.Exception

Returns an uninitialized configuration of the represented type. This method will be called for optional configurations when the getConfiguration() method caused an error and the forceCreate attribute is set. A concrete sub class can here try to create an uninitialized, empty configuration, which may be possible if the error was created during initialization. This base implementation just returns null.

Parameters:

decl - the bean declaration with initialization parameters for the configuration

Returns:

the new configuration object

Throws:

java.lang.Exception - if an error occurs

Since:

1.4

fetchConfigurationClass

protected java.lang.Class<?> fetchConfigurationClass()
                                              throws java.lang.Exception

Returns the configuration class supported by this provider. If a class object was set, it is returned. Otherwise the method tries to resolve the class name.

Returns:

the class of the configuration to be created

Throws:

java.lang.Exception

Since:

1.4

loadClass

protected java.lang.Class<?> loadClass(java.lang.String className)
                                throws java.lang.ClassNotFoundException

Loads the class with the specified name dynamically. If the class's name is null, null will also be returned.

Parameters:

className - the name of the class to be loaded

Returns:

the class object

Throws:

java.lang.ClassNotFoundException - if class loading fails

Since:

1.4