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org.apache.tiles.definition.digester
Class DigesterDefinitionsReader

java.lang.Object
  org.apache.tiles.definition.digester.DigesterDefinitionsReader

All Implemented Interfaces:

DefinitionsReader

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: 616890 $ $Date: 2008-01-30 21:16:51 +0100 (Wed, 30 Jan 2008) $

Field Summary

protected Digester	digester Digester object used to read Definition data from the source.
static String	PARSER_VALIDATE_PARAMETER_NAME Digester validation parameter name.
protected String[]	registrations The set of public identifiers, and corresponding resource names for the versions of the configuration file DTDs we know about.
protected boolean	validating Should we use a validating XML parser to read the configuration file.

Constructor Summary

DigesterDefinitionsReader()
Creates a new instance of DigesterDefinitionsReader.

Method Summary

void	addDefinition(Definition definition) Adds a new Definition to the internal Map or replaces an existing one.
void	init(Map<String,String> params) Initializes the DefinitionsReader object.
Map<String,Definition>	read(Object source) Reads Definition objects from a source.

Methods inherited from class java.lang.Object

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

Field Detail

PARSER_VALIDATE_PARAMETER_NAME

public static final String PARSER_VALIDATE_PARAMETER_NAME

Digester validation parameter name.

See Also:

Constant Field Values

digester

protected Digester digester

Digester object used to read Definition data from the source.

validating

protected boolean validating

Should we use a validating XML parser to read the configuration file. Default is true.

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 Detail

DigesterDefinitionsReader

public DigesterDefinitionsReader()

Creates a new instance of DigesterDefinitionsReader.

Method Detail

read

public Map<String,Definition> read(Object source)
                            throws DefinitionsFactoryException

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.

init

public void init(Map<String,String> params)
          throws DefinitionsFactoryException

Initializes the DefinitionsReader object.

This method must be called before the read(java.lang.Object) method is called.

Specified by:

init in interface DefinitionsReader

Parameters:

params - A map of properties used to set up the reader.

Throws:

DefinitionsFactoryException - if required properties are not passed in or the initialization fails.

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.