Package org.apache.tiles.definition.digester

Class DigesterDefinitionsReader

java.lang.Object
org.apache.tiles.definition.digester.DigesterDefinitionsReader
All Implemented Interfaces:
DefinitionsReader
Direct Known Subclasses:
CompatibilityDigesterDefinitionsReader
public class DigesterDefinitionsReader extends Object implements DefinitionsReader
Reads Definition objects from an XML InputStream using Digester.

This DefinitionsReader implementation expects the source to be passed as an InputStream. It parses XML data from the source and builds a Map of Definition objects.

The Digester object can be configured by passing in initialization parameters. Currently the only parameter that is supported is the validating parameter. This value is set to false by default. To enable DTD validation for XML Definition files, give the init method a parameter with a key of org.apache.tiles.definition.digester.DigesterDefinitionsReader.PARSER_VALIDATE and a value of "true".

The Definition objects are stored internally in a Map. The Map is stored as an instance variable rather than a local variable in the read method. This means that instances of this class are not thread-safe and access by multiple threads must be synchronized.

Version:
$Rev: 990237 $ $Date: 2010-08-28 05:33:35 +1000 (Sat, 28 Aug 2010) $

  • Field Details

    • PARSER_VALIDATE_PARAMETER_NAME

      public static final String PARSER_VALIDATE_PARAMETER_NAME
      Digester validation parameter name.
      See Also:

    • DEFINITION_HANDLER_CLASS

      protected static final String DEFINITION_HANDLER_CLASS
      The handler to create definitions.
      Since:
      2.1.0

    • PUT_ATTRIBUTE_HANDLER_CLASS

      protected static final String PUT_ATTRIBUTE_HANDLER_CLASS
      The handler to create attributes.
      Since:
      2.1.0

    • LIST_HANDLER_CLASS

      protected static final String LIST_HANDLER_CLASS
      The handler to create list attributes.
      Since:
      2.1.0

    • digester

      protected org.apache.commons.digester.Digester digester
      Digester object used to read Definition data from the source.

    • registrations

      protected String[] registrations
      The set of public identifiers, and corresponding resource names for the versions of the configuration file DTDs we know about. There MUST be an even number of Strings in this list!

  • Constructor Details

    • DigesterDefinitionsReader

      public DigesterDefinitionsReader()
      Creates a new instance of DigesterDefinitionsReader.

  • Method Details

    • setValidating

      public void setValidating(boolean validating)
      Sets the validation of XML files.
      Parameters:
      validating - true means that XML validation is turned on. false otherwise.
      Since:
      3.3.0

    • read

      public Map<String,Definition> read(Object source)
      Reads Definition objects from a source.

      Implementations should publish what type of source object is expected.

      Specified by:
      read in interface DefinitionsReader
      Parameters:
      source - The InputStream source from which definitions will be read.
      Returns:
      a Map of Definition objects read from the source.
      Throws:
      DefinitionsFactoryException - If the source is invalid or an error occurs when reading definitions.

    • initSyntax

      protected void initSyntax(org.apache.commons.digester.Digester digester)
      Initialised the syntax for reading XML files containing Tiles definitions.
      Parameters:
      digester - The digester to initialize.

    • addDefinition

      public void addDefinition(Definition definition)
      Adds a new Definition to the internal Map or replaces an existing one.
      Parameters:
      definition - The Definition object to be added.

    • getRegistrations

      protected String[] getRegistrations()
      Returns the registrations for local DTDs.
      Returns:
      An array containing the locations for registrations of local DTDs.
      Since:
      2.1.0

    • getNextUniqueDefinitionName

      protected String getNextUniqueDefinitionName(Map<String,Definition> definitions)
      Create a unique definition name usable to store anonymous definitions.
      Parameters:
      definitions - The already created definitions.
      Returns:
      The unique definition name to be used to store the definition.
      Since:
      2.1.0