org.apache.jackrabbit.core.config
Class ConfigurationParser

java.lang.Object
  org.apache.jackrabbit.core.config.ConfigurationParser

Direct Known Subclasses:

RepositoryConfigurationParser

public class ConfigurationParser
extends Object

Configuration parser base class. This class provides the basic functionality for parsing Jackrabbit configuration files. Subclasses extend this functionality with knowledge of the exact structure of the different configuration files. Each configuration parser instance contains a set of parser variables that are used for variable replacement in the configuration file.

Field Summary

static String	CLASS_ATTRIBUTE Name of the bean implementation class configuration attribute.
static String	NAME_ATTRIBUTE Name of the bean parameter name configuration attribute.
static String	PARAM_ELEMENT Name of the bean parameter configuration element.
static String	VALUE_ATTRIBUTE Name of the bean parameter value configuration attribute.

Constructor Summary

ConfigurationParser(Properties variables)
Creates a new configuration parser with the given parser variables.

Method Summary

protected String	getAttribute(Element element, String name) Returns the value of the named attribute of the given element.
protected String	getAttribute(Element element, String name, String def) Returns the value of the named attribute of the given element.
protected Element	getElement(Element parent, String name) Returns the named child of the given parent element.
protected Element	getElement(Element parent, String name, boolean required) Returns the named child of the given parent element.
protected EntityResolver	getEntityResolver() Returns the entity resolver to be used when parsing configuration documents.
protected ErrorHandler	getErrorHandler() Returns the error handler to be used when parsing configuration documents.
Properties	getVariables() Returns the variables.
protected BeanConfig	parseBeanConfig(Element element) Parses a named bean configuration from the given element.
protected BeanConfig	parseBeanConfig(Element parent, String name) Parses a named bean configuration from the given element.
protected Properties	parseParameters(Element element) Parses the configuration parameters of the given element.
protected Element	parseXML(InputSource xml) Parses the given XML document and returns the DOM root element.
protected Element	parseXML(InputSource xml, boolean validate) Parses the given XML document and returns the DOM root element.
protected Document	postParseModificationHook(Document document) A post-processing hook for the parsed repository or workspace configuration documents.
protected String	replaceVariables(String value) Performs variable replacement on the given string value.

Methods inherited from class java.lang.Object

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

Field Detail

PARAM_ELEMENT

public static final String PARAM_ELEMENT

Name of the bean parameter configuration element.

See Also:

Constant Field Values

CLASS_ATTRIBUTE

public static final String CLASS_ATTRIBUTE

Name of the bean implementation class configuration attribute.

See Also:

Constant Field Values

NAME_ATTRIBUTE

public static final String NAME_ATTRIBUTE

Name of the bean parameter name configuration attribute.

See Also:

Constant Field Values

VALUE_ATTRIBUTE

public static final String VALUE_ATTRIBUTE

Name of the bean parameter value configuration attribute.

See Also:

Constant Field Values

Constructor Detail

ConfigurationParser

public ConfigurationParser(Properties variables)

Creates a new configuration parser with the given parser variables.

Parameters:

variables - parser variables

Method Detail

getVariables

public Properties getVariables()

Returns the variables.

Returns:

the variables.

parseBeanConfig

protected BeanConfig parseBeanConfig(Element parent,
                                     String name)
                              throws ConfigurationException

Parses a named bean configuration from the given element. Bean configuration uses the following format:

   <BeanName class="...">
     <param name="..." value="..."/>
     ...
   </BeanName>
 

The returned bean configuration object contains the configured class name and configuration parameters. Variable replacement is performed on the parameter values.

Parameters:

parent - parent element

name - name of the bean configuration element

Returns:

bean configuration,

Throws:

ConfigurationException - if the configuration element does not exist or is broken

parseBeanConfig

protected BeanConfig parseBeanConfig(Element element)
                              throws ConfigurationException

Parses a named bean configuration from the given element. Bean configuration uses the following format:

   <BeanName class="...">
     <param name="..." value="..."/>
     ...
   </BeanName>
 

The returned bean configuration object contains the configured class name and configuration parameters. Variable replacement is performed on the parameter values.

Parameters:

element -

Returns:

bean configuration,

Throws:

ConfigurationException - if the configuration element does not exist or is broken

parseParameters

protected Properties parseParameters(Element element)
                              throws ConfigurationException

Parses the configuration parameters of the given element. Parameters are stored as <param name="..." value="..."/> child elements. This method parses all param elements, performs variable replacement on parameter values, and returns the resulting name-value pairs.

Parameters:

element - configuration element

Returns:

configuration parameters

Throws:

ConfigurationException - if a param element does not contain the name and value attributes

replaceVariables

protected String replaceVariables(String value)
                           throws ConfigurationException

Performs variable replacement on the given string value. Each ${...} sequence within the given value is replaced with the value of the named parser variable. The replacement is not done if the named variable does not exist.

Parameters:

value - original value

Returns:

value after variable replacements

Throws:

ConfigurationException - if the replacement of a referenced variable is not found

parseXML

protected Element parseXML(InputSource xml)
                    throws ConfigurationException

Parses the given XML document and returns the DOM root element. A custom entity resolver is used to make the included configuration file DTD available using the specified public identifiers. This implementation does not validate the XML.

Parameters:

xml - xml document

Returns:

root element

Throws:

ConfigurationException - if the configuration document could not be read or parsed

See Also:

ConfigurationEntityResolver

getErrorHandler

protected ErrorHandler getErrorHandler()

Returns the error handler to be used when parsing configuration documents. Subclasses can override this method to provide custom error handling.

Returns:

error handler

Since:

Apache Jackrabbit 2.0

getEntityResolver

protected EntityResolver getEntityResolver()

Returns the entity resolver to be used when parsing configuration documents. Subclasses can override this method to provide custom entity resolution rules.

Returns:

error handler

Since:

Apache Jackrabbit 2.0

postParseModificationHook

protected Document postParseModificationHook(Document document)

A post-processing hook for the parsed repository or workspace configuration documents. This hook makes it possible to make custom DOM modifications for backwards-compatibility or other reasons.

Parameters:

document - the parsed configuration document

Returns:

the configuration document after any modifications

Since:

Apache Jackrabbit 2.0

parseXML

protected Element parseXML(InputSource xml,
                           boolean validate)
                    throws ConfigurationException

Parses the given XML document and returns the DOM root element. A custom entity resolver is used to make the included configuration file DTD available using the specified public identifiers.

Parameters:

xml - xml document

validate - whether the XML should be validated

Returns:

root element

Throws:

ConfigurationException - if the configuration document could not be read or parsed

See Also:

ConfigurationEntityResolver

getElement

protected Element getElement(Element parent,
                             String name)
                      throws ConfigurationException

Returns the named child of the given parent element.

Parameters:

parent - parent element

name - name of the child element

Returns:

named child element

Throws:

ConfigurationException

ConfigurationException - if the child element is not found

getElement

protected Element getElement(Element parent,
                             String name,
                             boolean required)
                      throws ConfigurationException

Returns the named child of the given parent element.

Parameters:

parent - parent element

name - name of the child element

required - indicates if the child element is required

Returns:

named child element, or null if not found and required is false.

Throws:

ConfigurationException - if the child element is not found and required is true; or if more than one element with this name exists.

getAttribute

protected String getAttribute(Element element,
                              String name)
                       throws ConfigurationException

Returns the value of the named attribute of the given element.

Parameters:

element - element

name - attribute name

Returns:

attribute value

Throws:

ConfigurationException - if the attribute is not found

getAttribute

protected String getAttribute(Element element,
                              String name,
                              String def)

Returns the value of the named attribute of the given element. If the attribute is not found, then the given default value is returned.

Parameters:

element - element

name - attribute name

def - default value

Returns:

attribute value, or the default value