Package org.apache.commons.configuration2.builder.combined

## Class MultiFileConfigurationBuilderProvider

- java.lang.Object
- - org.apache.commons.configuration2.builder.combined.BaseConfigurationBuilderProvider
  - - org.apache.commons.configuration2.builder.combined.MultiFileConfigurationBuilderProvider

- All Implemented Interfaces:
    `ConfigurationBuilderProvider`

      public class MultiFileConfigurationBuilderProvider
      extends BaseConfigurationBuilderProvider

  A specialized `ConfigurationBuilderProvider` implementation for integrating `MultiFileConfigurationBuilder` with `CombinedConfigurationBuilder`.

  When using a configuration source managed by `MultiFileConfigurationBuilder` it is not sufficient to store the configuration once obtained from the builder in the resulting combined configuration. Rather, it has to be ensured that each access to this configuration queries the builder anew so that it can evaluate its file pattern and return a different configuration if necessary. Therefore, this class returns a specialized wrapper over a `MultiFileConfigurationBuilder` which returns a configuration wrapping the builder; so accessing the configuration's properties actually calls back to the builder. This constellation is compatible with the way `DynamicCombinedConfiguration` manages its data.

  Since:
    2.0

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `MultiFileConfigurationBuilderProvider​(String configCls, String paramCls)` | Creates a new instance of `MultiFileConfigurationBuilderProvider` and sets the name of the configuration class to be returned by `MultiFileConfigurationBuilder`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `ConfigurationBuilder<? extends Configuration>` | `getConfigurationBuilder​(ConfigurationDeclaration decl)` | Gets the builder for the configuration source managed by this provider.

    - ### Methods inherited from class org.apache.commons.configuration2.builder.combined.BaseConfigurationBuilderProvider

      `configureBuilder, createBuilder, createParameterObjects, determineBuilderClass, determineConfigurationClass, getBuilderClass, getConfigurationClass, getParameterClasses, getReloadingBuilderClass, inheritParentBuilderProperties, initializeParameterObjects, isAllowFailOnInit`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### MultiFileConfigurationBuilderProvider

          public MultiFileConfigurationBuilderProvider​(String configCls,
                                                       String paramCls)

      Creates a new instance of `MultiFileConfigurationBuilderProvider` and sets the name of the configuration class to be returned by `MultiFileConfigurationBuilder`.
      Parameters:
        `configCls` - the name of the managed configuration class
        `paramCls` - the name of the class of the parameters object to configure the managed configuration

  - ### Method Detail

    - #### getConfigurationBuilder

          public ConfigurationBuilder<? extends Configuration> getConfigurationBuilder​(ConfigurationDeclaration decl)
                                                                                throws ConfigurationException

      Gets the builder for the configuration source managed by this provider. This method is called during processing of the combined configuration definition file. This implementation delegates to some protected methods to create a new builder instance using reflection and to configure it with parameter values defined by the passed in `BeanDeclaration`. This implementation lets the super class create a fully configured builder. Then it returns a special wrapper around it.
      Specified by:
        `getConfigurationBuilder` in interface `ConfigurationBuilderProvider`
      Overrides:
        `getConfigurationBuilder` in class `BaseConfigurationBuilderProvider`
      Parameters:
        `decl` - the bean declaration with initialization parameters for the configuration builder
      Returns:
        the `ConfigurationBuilder` object created by this provider
      Throws:
        `ConfigurationException` - if an error occurs