Class CombinedConfigurationBuilder

  • All Implemented Interfaces:
    ConfigurationBuilder<CombinedConfiguration>, EventSource
    Direct Known Subclasses:
    ReloadingCombinedConfigurationBuilder

    public class CombinedConfigurationBuilder
    extends BasicConfigurationBuilder<CombinedConfiguration>

    A specialized ConfigurationBuilder implementation that creates a CombinedConfiguration from multiple configuration sources defined by an XML-based configuration definition file.

    This class provides an easy and flexible means for loading multiple configuration sources and combining the results into a single configuration object. The sources to be loaded are defined in an XML document that can contain certain tags representing the different supported configuration classes. If such a tag is found, a corresponding ConfigurationBuilder class is instantiated and initialized using the classes of the beanutils package (namely XMLBeanDeclaration will be used to extract the configuration's initialization parameters, which allows for complex initialization scenarios).

    It is also possible to add custom tags to the configuration definition file. For this purpose an implementation of CombinedConfigurationBuilderProvider has to be created which is responsible for the creation of a ConfigurationBuilder associated with the custom tag. An instance of this class has to be registered at the CombinedBuilderParametersImpl object which is used to initialize this CombinedConfigurationBuilder. This provider will then be called when the corresponding custom tag is detected. For many default configuration classes providers are already registered.

    The configuration definition file has the following basic structure:

     <configuration systemProperties="properties file name">
       <header>
         <!-- Optional meta information about the combined configuration -->
       </header>
       <override>
         <!-- Declarations for override configurations -->
       </override>
       <additional>
         <!-- Declarations for union configurations -->
       </additional>
     </configuration>
     

    The name of the root element (here configuration) is arbitrary. The optional systemProperties attribute identifies the path to a property file containing properties that should be added to the system properties. If specified on the root element, the system properties are set before the rest of the configuration is processed.

    There are two sections (both of them are optional) for declaring override and additional configurations. Configurations in the former section are evaluated in the order of their declaration, and properties of configurations declared earlier hide those of configurations declared later. Configurations in the latter section are combined to a union configuration, i.e. all of their properties are added to a large hierarchical configuration. Configuration declarations that occur as direct children of the root element are treated as override declarations.

    Each configuration declaration consists of a tag whose name is associated with a CombinedConfigurationBuilderProvider. This can be one of the predefined tags like properties, or xml, or a custom tag, for which a configuration builder provider was registered (as described above). Attributes and sub elements with specific initialization parameters can be added. There are some reserved attributes with a special meaning that can be used in every configuration declaration:

    Standard attributes for configuration declarations
    Attribute Meaning
    config-name Allows specifying a name for this configuration. This name can be used to obtain a reference to the configuration from the resulting combined configuration (see below). It can also be passed to the getNamedBuilder(String) method.
    config-at With this attribute an optional prefix can be specified for the properties of the corresponding configuration.
    config-optional Declares a configuration source as optional. This means that errors that occur when creating the configuration are ignored.
    config-reload Many configuration sources support a reloading mechanism. For those sources it is possible to enable reloading by providing this attribute with a value of true.

    The optional header section can contain some meta data about the created configuration itself. For instance, it is possible to set further properties of the NodeCombiner objects used for constructing the resulting configuration.

    The default configuration object returned by this builder is an instance of the CombinedConfiguration class. This allows for convenient access to the configuration objects maintained by the combined configuration (e.g. for updates of single configuration objects). It has also the advantage that the properties stored in all declared configuration objects are collected and transformed into a single hierarchical structure, which can be accessed using different expression engines. The actual CombinedConfiguration implementation can be overridden by specifying the class in the config-class attribute of the result element.

    A custom EntityResolver can be used for all XMLConfigurations by adding

     <entity-resolver config-class="EntityResolver fully qualified class name">
     

    A specific CatalogResolver can be specified for all XMLConfiguration sources by adding

     <entity-resolver catalogFiles="comma separated list of catalog files">
     

    Additional ConfigurationProviders can be added by configuring them in the header section.

     <providers>
       <provider config-tag="tag name" config-class="provider fully qualified class name"/>
     </providers>
     

    Additional variable resolvers can be added by configuring them in the header section.

     <lookups>
       <lookup config-prefix="prefix" config-class="StrLookup fully qualified class name"/>
     </lookups>
     

    All declared override configurations are directly added to the resulting combined configuration. If they are given names (using the config-name attribute), they can directly be accessed using the getConfiguration(String) method of CombinedConfiguration. The additional configurations are altogether added to another combined configuration, which uses a union combiner. Then this union configuration is added to the resulting combined configuration under the name defined by the ADDITIONAL_NAME constant. The getNamedBuilder(String) method can be used to access the ConfigurationBuilder objects for all configuration sources which have been assigned a name; care has to be taken that these names are unique.

    Since:
    1.3
    • Field Detail

      • ADDITIONAL_NAME

        public static final java.lang.String ADDITIONAL_NAME
        Constant for the name of the additional configuration. If the configuration definition file contains an additional section, a special union configuration is created and added under this name to the resulting combined configuration.
      • CONFIG_BEAN_FACTORY_NAME

        static final java.lang.String CONFIG_BEAN_FACTORY_NAME
        Constant for the name of the configuration bean factory.
      • ATTR_NAME

        static final java.lang.String ATTR_NAME
        Constant for the reserved name attribute.
        See Also:
        Constant Field Values
      • ATTR_ATNAME

        static final java.lang.String ATTR_ATNAME
        Constant for the name of the at attribute.
        See Also:
        Constant Field Values
      • ATTR_AT_RES

        static final java.lang.String ATTR_AT_RES
        Constant for the reserved at attribute.
        See Also:
        Constant Field Values
      • ATTR_AT

        static final java.lang.String ATTR_AT
        Constant for the at attribute without the reserved prefix.
        See Also:
        Constant Field Values
      • ATTR_OPTIONALNAME

        static final java.lang.String ATTR_OPTIONALNAME
        Constant for the name of the optional attribute.
        See Also:
        Constant Field Values
      • ATTR_OPTIONAL_RES

        static final java.lang.String ATTR_OPTIONAL_RES
        Constant for the reserved optional attribute.
        See Also:
        Constant Field Values
      • ATTR_OPTIONAL

        static final java.lang.String ATTR_OPTIONAL
        Constant for the optional attribute without the reserved prefix.
        See Also:
        Constant Field Values
      • ATTR_FORCECREATE

        static final java.lang.String ATTR_FORCECREATE
        Constant for the forceCreate attribute.
        See Also:
        Constant Field Values
      • ATTR_RELOAD

        static final java.lang.String ATTR_RELOAD
        Constant for the reload attribute.
        See Also:
        Constant Field Values
      • KEY_SYSTEM_PROPS

        static final java.lang.String KEY_SYSTEM_PROPS
        Constant for the tag attribute for providers.
        See Also:
        Constant Field Values
      • SEC_HEADER

        static final java.lang.String SEC_HEADER
        Constant for the name of the header section.
        See Also:
        Constant Field Values
      • KEY_UNION

        static final java.lang.String KEY_UNION
        Constant for an expression that selects the union configurations.
        See Also:
        Constant Field Values
      • CONFIG_SECTIONS

        static final java.lang.String[] CONFIG_SECTIONS
        An array with the names of top level configuration sections.
      • KEY_OVERRIDE

        static final java.lang.String KEY_OVERRIDE
        Constant for an expression that selects override configurations in the override section.
        See Also:
        Constant Field Values
      • KEY_OVERRIDE_LIST

        static final java.lang.String KEY_OVERRIDE_LIST
        Constant for the key that points to the list nodes definition of the override combiner.
        See Also:
        Constant Field Values
      • KEY_ADDITIONAL_LIST

        static final java.lang.String KEY_ADDITIONAL_LIST
        Constant for the key that points to the list nodes definition of the additional combiner.
        See Also:
        Constant Field Values
      • KEY_CONFIGURATION_PROVIDERS

        static final java.lang.String KEY_CONFIGURATION_PROVIDERS
        Constant for the key for defining providers in the configuration file.
        See Also:
        Constant Field Values
      • KEY_PROVIDER_KEY

        static final java.lang.String KEY_PROVIDER_KEY
        Constant for the tag attribute for providers.
        See Also:
        Constant Field Values
      • KEY_CONFIGURATION_LOOKUPS

        static final java.lang.String KEY_CONFIGURATION_LOOKUPS
        Constant for the key for defining variable resolvers
        See Also:
        Constant Field Values
      • KEY_ENTITY_RESOLVER

        static final java.lang.String KEY_ENTITY_RESOLVER
        Constant for the key for defining entity resolvers
        See Also:
        Constant Field Values
      • KEY_LOOKUP_KEY

        static final java.lang.String KEY_LOOKUP_KEY
        Constant for the prefix attribute for lookups.
        See Also:
        Constant Field Values
      • FILE_SYSTEM

        static final java.lang.String FILE_SYSTEM
        Constant for the FileSystem.
        See Also:
        Constant Field Values
      • KEY_RESULT

        static final java.lang.String KEY_RESULT
        Constant for the key of the result declaration. This key can point to a bean declaration, which defines properties of the resulting combined configuration.
        See Also:
        Constant Field Values
      • KEY_COMBINER

        static final java.lang.String KEY_COMBINER
        Constant for the key of the combiner in the result declaration.
        See Also:
        Constant Field Values
      • EXT_XML

        static final java.lang.String EXT_XML
        Constant for the XML file extension.
        See Also:
        Constant Field Values
      • BASIC_BUILDER

        private static final java.lang.String BASIC_BUILDER
        Constant for the basic configuration builder class.
        See Also:
        Constant Field Values
      • FILE_BUILDER

        private static final java.lang.String FILE_BUILDER
        Constant for the file-based configuration builder class.
        See Also:
        Constant Field Values
      • RELOADING_BUILDER

        private static final java.lang.String RELOADING_BUILDER
        Constant for the reloading file-based configuration builder class.
        See Also:
        Constant Field Values
      • FILE_PARAMS

        private static final java.lang.String FILE_PARAMS
        Constant for the name of the file-based builder parameters class.
        See Also:
        Constant Field Values
      • PROPERTIES_PROVIDER

        private static final ConfigurationBuilderProvider PROPERTIES_PROVIDER
        Constant for the provider for properties files.
      • DEFAULT_TAGS

        private static final java.lang.String[] DEFAULT_TAGS
        An array with the names of the default tags.
      • DEFAULT_PROVIDERS

        private static final ConfigurationBuilderProvider[] DEFAULT_PROVIDERS
        An array with the providers for the default tags.
      • DEFAULT_PROVIDERS_MAP

        private static final java.util.Map<java.lang.String,​ConfigurationBuilderProvider> DEFAULT_PROVIDERS_MAP
        A map with the default configuration builder providers.
      • definitionConfiguration

        private HierarchicalConfiguration<?> definitionConfiguration
        Stores temporarily the configuration with the builder definitions.
      • currentConfiguration

        private CombinedConfiguration currentConfiguration
        The configuration that is currently constructed.
      • parentInterpolator

        private ConfigurationInterpolator parentInterpolator
        A ConfigurationInterpolator to be used as parent for all child configurations to enable cross-source interpolation.
    • Constructor Detail

      • CombinedConfigurationBuilder

        public CombinedConfigurationBuilder()
        Creates a new instance of CombinedConfigurationBuilder. No parameters are set.
      • CombinedConfigurationBuilder

        public CombinedConfigurationBuilder​(java.util.Map<java.lang.String,​java.lang.Object> params)
        Creates a new instance of CombinedConfigurationBuilder and sets the specified initialization parameters.
        Parameters:
        params - a map with initialization parameters
      • CombinedConfigurationBuilder

        public CombinedConfigurationBuilder​(java.util.Map<java.lang.String,​java.lang.Object> params,
                                            boolean allowFailOnInit)
        Creates a new instance of CombinedConfigurationBuilder and sets the specified initialization parameters and the allowFailOnInit flag.
        Parameters:
        params - a map with initialization parameters
        allowFailOnInit - the allowFailOnInit flag
    • Method Detail

      • createDefaultProviders

        private static java.util.Map<java.lang.String,​ConfigurationBuilderProvider> createDefaultProviders()
        Creates the map with the default configuration builder providers.
        Returns:
        the map with default providers
      • initNodeCombinerListNodes

        private static void initNodeCombinerListNodes​(CombinedConfiguration cc,
                                                      HierarchicalConfiguration<?> defConfig,
                                                      java.lang.String key)
        Initializes the list nodes of the node combiner for the given combined configuration. This information can be set in the header section of the configuration definition file for both the override and the union combiners.
        Parameters:
        cc - the combined configuration to initialize
        defConfig - the definition configuration
        key - the key for the list nodes
      • addDefinitionBuilderChangeListener

        private void addDefinitionBuilderChangeListener​(ConfigurationBuilder<? extends HierarchicalConfiguration<?>> defBuilder)
        Adds a listener at the given definition builder which resets this builder when a reset of the definition builder happens. This way it is ensured that this builder produces a new combined configuration when its definition configuration changes.
        Parameters:
        defBuilder - the definition builder
      • builderNames

        public java.util.Set<java.lang.String> builderNames()

        Returns a set with the names of all child configuration builders. A tag defining a configuration source in the configuration definition file can have the config-name attribute. If this attribute is present, the corresponding builder is assigned this name and can be directly accessed through the getNamedBuilder(String) method. This method returns a collection with all available builder names.

        Important note: This method only returns a meaningful result after the result configuration has been created by calling getConfiguration(). If called before, always an empty set is returned.

        Returns:
        a set with the names of all builders
      • configure

        public CombinedConfigurationBuilder configure​(BuilderParameters... params)
        Appends the content of the specified BuilderParameters objects to the current initialization parameters. Calling this method multiple times will create a union of the parameters provided. This method is overridden to adapt the return type.
        Overrides:
        configure in class BasicConfigurationBuilder<CombinedConfiguration>
        Parameters:
        params - an arbitrary number of objects with builder parameters
        Returns:
        a reference to this builder for method chaining
      • configureEntityResolver

        protected void configureEntityResolver​(HierarchicalConfiguration<?> config,
                                               XMLBuilderParametersImpl xmlParams)
                                        throws ConfigurationException
        Creates and initializes a default EntityResolver if the definition configuration contains a corresponding declaration.
        Parameters:
        config - the definition configuration
        xmlParams - the (already partly initialized) object with XML parameters; here the new resolver is to be stored
        Throws:
        ConfigurationException - if an error occurs
      • createAdditionalsConfiguration

        protected CombinedConfiguration createAdditionalsConfiguration​(CombinedConfiguration resultConfig)
        Creates the CombinedConfiguration for the configuration sources in the &lt;additional&gt; section. This method is called when the builder constructs the final configuration. It creates a new CombinedConfiguration and initializes some properties from the result configuration.
        Parameters:
        resultConfig - the result configuration (this is the configuration that will be returned by the builder)
        Returns:
        the CombinedConfiguration for the additional configuration sources
        Since:
        1.7
      • createDeclarations

        private java.util.Collection<ConfigurationDeclaration> createDeclarations​(java.util.Collection<? extends HierarchicalConfiguration<?>> configs)
        Creates ConfigurationDeclaration objects for the specified configurations.
        Parameters:
        configs - the list with configurations
        Returns:
        a collection with corresponding declarations
      • createResultDeclaration

        protected BeanDeclaration createResultDeclaration​(java.util.Map<java.lang.String,​java.lang.Object> params)
                                                   throws ConfigurationException
        Creates a new BeanDeclaration which is used for creating new result objects dynamically. This implementation creates a specialized BeanDeclaration object that is initialized from the given map of initialization parameters. The BeanDeclaration must be initialized with the result class of this builder, otherwise exceptions will be thrown when the result object is created. Note: This method is invoked in a synchronized block. This implementation evaluates the result property of the definition configuration. It creates a combined bean declaration with both the properties specified in the definition file and the properties defined as initialization parameters.
        Overrides:
        createResultDeclaration in class BasicConfigurationBuilder<CombinedConfiguration>
        Parameters:
        params - a snapshot of the current initialization parameters
        Returns:
        the BeanDeclaration for creating result objects
        Throws:
        ConfigurationException - if an error occurs
      • createXMLDefinitionBuilder

        protected ConfigurationBuilder<? extends HierarchicalConfiguration<?>> createXMLDefinitionBuilder​(BuilderParameters builderParams)
        Creates a default builder for the definition configuration and initializes it with a parameters object. This method is called if no definition builder is defined in this builder's parameters. This implementation creates a default file-based builder which produces an XMLConfiguration; it expects a corresponding file specification. Note: This method is called in a synchronized block.
        Parameters:
        builderParams - the parameters object for the builder
        Returns:
        the standard builder for the definition configuration
      • fetchPrefixLookups

        private java.util.Map<java.lang.String,​? extends Lookup> fetchPrefixLookups()
        Returns a map with the current prefix lookup objects. This map is obtained from the ConfigurationInterpolator of the configuration under construction.
        Returns:
        the map with current prefix lookups (may be null)
      • getBasePath

        private java.lang.String getBasePath()
        Gets the current base path of this configuration builder. This is used for instance by all file-based child configurations.
        Returns:
        the base path
      • getChildBuilders

        protected java.util.Collection<ConfigurationBuilder<? extends Configuration>> getChildBuilders()
        Gets a collection with the builders for all child configuration sources. This method can be used by derived classes providing additional functionality on top of the declared configuration sources. It only returns a defined value during construction of the result configuration instance.
        Returns:
        a collection with the builders for child configuration sources
      • getConfigurationUnderConstruction

        CombinedConfiguration getConfigurationUnderConstruction()
        Gets the configuration object that is currently constructed. This method can be called during construction of the result configuration. It is intended for internal usage, e.g. some specialized builder providers need access to this configuration to perform advanced initialization.
        Returns:
        the configuration that us currently under construction
      • getDefinitionConfiguration

        protected HierarchicalConfiguration<?> getDefinitionConfiguration()
                                                                   throws ConfigurationException
        Gets the configuration containing the definition of the combined configuration to be created. This method only returns a defined result during construction of the result configuration. The definition configuration is obtained from the definition builder at first access and then stored temporarily to ensure that during result construction always the same configuration instance is used. (Otherwise, it would be possible that the definition builder returns a different instance when queried multiple times.)
        Returns:
        the definition configuration
        Throws:
        ConfigurationException - if an error occurs
      • getNamedBuilder

        public ConfigurationBuilder<? extends Configuration> getNamedBuilder​(java.lang.String name)
                                                                      throws ConfigurationException

        Gets the configuration builder with the given name. With this method a builder of a child configuration which was given a name in the configuration definition file can be accessed directly.

        Important note: This method only returns a meaningful result after the result configuration has been created by calling getConfiguration(). If called before, always an exception is thrown.

        Parameters:
        name - the name of the builder in question
        Returns:
        the child configuration builder with this name
        Throws:
        ConfigurationException - if information about named builders is not yet available or no builder with this name exists
      • initBean

        void initBean​(java.lang.Object bean,
                      BeanDeclaration decl)
        Initializes a bean using the current BeanHelper. This is needed by builder providers when the configuration objects for sub builders are constructed.
        Parameters:
        bean - the bean to be initialized
        decl - the BeanDeclaration
      • initChildBasicParameters

        private void initChildBasicParameters​(BasicBuilderParameters params)
        Initializes basic builder parameters for a child configuration with default settings set for this builder. This implementation ensures that all Lookup objects are propagated to child configurations and interpolation is setup correctly.
        Parameters:
        params - the parameters object
      • initChildBuilderParameters

        protected void initChildBuilderParameters​(BuilderParameters params)
        Initializes a parameters object for a child builder. This combined configuration builder has a bunch of properties which may be inherited by child configurations, e.g. the base path, the file system, etc. While processing the builders for child configurations, this method is called for each parameters object for a child builder. It initializes some properties of the passed in parameters objects which are derived from this parent builder.
        Parameters:
        params - the parameters object to be initialized
      • initChildCombinedParameters

        private void initChildCombinedParameters​(CombinedBuilderParametersImpl params)
        Initializes a parameters object for a combined configuration builder with properties already set for this parent builder. This implementation deals only with a subset of properties. Other properties are already handled by the specialized builder provider.
        Parameters:
        params - the parameters object
      • initChildEventListeners

        void initChildEventListeners​(BasicConfigurationBuilder<? extends Configuration> dest)
        Initializes the event listeners of the specified builder from this object. This method is used to inherit all listeners from a parent builder.
        Parameters:
        dest - the destination builder object which is to be initialized
      • initChildFileBasedParameters

        private void initChildFileBasedParameters​(FileBasedBuilderProperties<?> params)
        Initializes a parameters object for a file-based configuration with properties already set for this parent builder. This method handles properties like a default file system or a base path.
        Parameters:
        params - the parameters object
      • initChildXMLParameters

        private void initChildXMLParameters​(XMLBuilderProperties<?> params)
        Initializes a parameters object for an XML configuration with properties already set for this parent builder.
        Parameters:
        params - the parameters object
      • initDefaultBasePath

        private void initDefaultBasePath()
                                  throws ConfigurationException
        Initializes the default base path for all file-based child configuration sources. The base path can be explicitly defined in the parameters of this builder. Otherwise, if the definition builder is a file-based builder, it is obtained from there.
        Throws:
        ConfigurationException - if an error occurs
      • initDefaultChildParameters

        private void initDefaultChildParameters​(BuilderParameters params)
        Executes the DefaultParametersManager stored in the current parameters on the passed in parameters object. If default handlers have been registered for this type of parameters, an initialization is now performed. This method is called before the parameters object is initialized from the configuration definition file. So default values can be overridden later with concrete property definitions.
        Parameters:
        params - the parameters to be initialized
        Throws:
        ConfigurationRuntimeException - if an error occurs when copying properties
      • initFileSystem

        protected FileSystem initFileSystem​(HierarchicalConfiguration<?> config)
                                     throws ConfigurationException
        Creates and initializes a default FileSystem if the definition configuration contains a corresponding declaration. The file system returned by this method is used as default for all file-based child configuration sources.
        Parameters:
        config - the definition configuration
        Returns:
        the default FileSystem (may be null)
        Throws:
        ConfigurationException - if an error occurs
      • initSystemProperties

        protected void initSystemProperties​(HierarchicalConfiguration<?> config,
                                            java.lang.String basePath)
                                     throws ConfigurationException
        Handles a file with system properties that may be defined in the definition configuration. If such property file is configured, all of its properties are added to the system properties.
        Parameters:
        config - the definition configuration
        basePath - the base path defined for this builder (may be null)
        Throws:
        ConfigurationException - if an error occurs.
      • providerForTag

        protected ConfigurationBuilderProvider providerForTag​(java.lang.String tagName)
        Returns the ConfigurationBuilderProvider for the given tag. This method is called during creation of the result configuration. (It is not allowed to call it at another point of time; result is then unpredictable!) It supports all default providers and custom providers added through the parameters object as well.
        Parameters:
        tagName - the name of the tag
        Returns:
        the provider that was registered for this tag or null if there is none
      • registerConfiguredLookups

        protected void registerConfiguredLookups​(HierarchicalConfiguration<?> defConfig,
                                                 Configuration resultConfig)
                                          throws ConfigurationException
        Processes custom Lookup objects that might be declared in the definition configuration. Each Lookup object is registered at the definition configuration and at the result configuration. It is also added to all child configurations added to the resulting combined configuration.
        Parameters:
        defConfig - the definition configuration
        resultConfig - the resulting configuration
        Throws:
        ConfigurationException - if an error occurs
      • registerConfiguredProviders

        private void registerConfiguredProviders​(HierarchicalConfiguration<?> defConfig)
        Registers providers defined in the configuration.
        Parameters:
        defConfig - the definition configuration
      • resetParameters

        public void resetParameters()
        Removes all initialization parameters of this builder. This method can be called if this builder is to be reused for creating result objects with a different configuration. This implementation resets some specific internal state of this builder.
        Overrides:
        resetParameters in class BasicConfigurationBuilder<CombinedConfiguration>
      • setUpCurrentParameters

        private void setUpCurrentParameters()
        Initializes the current parameters object. This object has either been passed at builder configuration time or it is newly created. In any case, it is manipulated during result creation.
      • setUpCurrentXMLParameters

        private void setUpCurrentXMLParameters()
                                        throws ConfigurationException
        Sets up an XML parameters object which is used to store properties related to XML and file-based configurations during creation of the result configuration. The properties stored in this object can be inherited to child configurations.
        Throws:
        ConfigurationException - if an error occurs
      • setupDefinitionBuilder

        protected ConfigurationBuilder<? extends HierarchicalConfiguration<?>> setupDefinitionBuilder​(java.util.Map<java.lang.String,​java.lang.Object> params)
                                                                                               throws ConfigurationException
        Obtains the ConfigurationBuilder object which provides access to the configuration containing the definition of the combined configuration to create. If a definition builder is defined in the parameters, it is used. Otherwise, we check whether the combined builder parameters object contains a parameters object for the definition builder. If this is the case, a builder for an XMLConfiguration is created and configured with this object. As a last resort, it is looked for a FileBasedBuilderParametersImpl object in the properties. If found, also a XML configuration builder is created which loads this file. Note: This method is called from a synchronized block.
        Parameters:
        params - the current parameters for this builder
        Returns:
        the builder for the definition configuration
        Throws:
        ConfigurationException - if an error occurs
      • setUpParentInterpolator

        private void setUpParentInterpolator​(Configuration resultConfig,
                                             Configuration defConfig)
        Sets up a parent ConfigurationInterpolator object. This object has a default Lookup querying the resulting combined configuration. Thus interpolation works globally across all configuration sources.
        Parameters:
        resultConfig - the result configuration
        defConfig - the definition configuration