org.apache.avalon.framework.configuration
Class DefaultConfiguration

java.lang.Object
  |
  +--org.apache.avalon.framework.configuration.AbstractConfiguration
        |
        +--org.apache.avalon.framework.configuration.DefaultConfiguration

All Implemented Interfaces:

Configuration, Serializable

public class DefaultConfiguration

extends AbstractConfiguration

implements Serializable

This is the default Configuration implementation.

Version:

CVS $Revision: 1.32 $ $Date: 2003/02/11 16:19:27 $

Author:

Avalon Development Team

See Also:

Serialized Form

Field Summary

protected static Configuration[]

EMPTY_ARRAY An empty (length zero) array of configuration objects.

Constructor Summary

DefaultConfiguration(String name)
Create a new DefaultConfiguration instance.

DefaultConfiguration(String name, String location)
Create a new DefaultConfiguration instance.

DefaultConfiguration(String name, String location, String ns, String prefix)
Create a new DefaultConfiguration instance.

Method Summary

void	addAll(Configuration other) Add all the attributes, children and value from specified configuration element to current configuration element.
void	addAllAttributes(Configuration other) Add all attributes from specified configuration element to current configuration element.
void	addAllChildren(Configuration other) Add all child Configuration objects from specified configuration element to current configuration element.
String	addAttribute(String name, String value) Deprecated. Use setAttribute() instead
void	addChild(Configuration configuration) Add a child Configuration to this configuration element.
void	appendValueData(String value) Deprecated. Use setValue() instead
protected void	checkWriteable() heck if this configuration is writeable.
String	getAttribute(String name) Returns the value of the attribute specified by its name as a String.
String[]	getAttributeNames() Return an array of all attribute names.
Configuration	getChild(String name, boolean createNew) Return the first Configuration object child of this associated with the given name.
int	getChildCount() Return count of children.
Configuration[]	getChildren() Return an array of Configuration elements containing all node children.
Configuration[]	getChildren(String name) Return an array of Configuration objects children of this associated with the given name.
String	getLocation() Returns a description of location of element.
String	getName() Returns the name of this configuration element.
String	getNamespace() Returns the namespace of this configuration element
protected String	getPrefix() Returns the prefix of the namespace
String	getValue() Returns the value of the configuration element as a String.
String	getValue(String defaultValue) Returns the value of the configuration element as a String.
void	makeReadOnly() Make this configuration read-only.
void	removeChild(Configuration configuration) Remove a child Configuration to this configuration element.
void	setAttribute(String name, String value) Set the value of the specified attribute to the specified string.
void	setValue(String value) Set the value of this Configuration object to the specified string.

Methods inherited from class org.apache.avalon.framework.configuration.AbstractConfiguration

getAttribute, getAttributeAsBoolean, getAttributeAsBoolean, getAttributeAsFloat, getAttributeAsFloat, getAttributeAsInteger, getAttributeAsInteger, getAttributeAsLong, getAttributeAsLong, getChild, getValueAsBoolean, getValueAsBoolean, getValueAsFloat, getValueAsFloat, getValueAsInteger, getValueAsInteger, getValueAsLong, getValueAsLong

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_ARRAY

protected static final Configuration[] EMPTY_ARRAY

An empty (length zero) array of configuration objects.

Constructor Detail

DefaultConfiguration

public DefaultConfiguration(String name)

Create a new DefaultConfiguration instance.

Parameters:

name - a String value

DefaultConfiguration

public DefaultConfiguration(String name,
                            String location)

Create a new DefaultConfiguration instance.

Parameters:

name - a String value

location - a String value

DefaultConfiguration

public DefaultConfiguration(String name,
                            String location,
                            String ns,
                            String prefix)

Create a new DefaultConfiguration instance.

Parameters:

name - config node name

location - Builder-specific locator string

ns - Namespace string (typically a URI). Should not be null; use "" if no namespace.

prefix - A short string prefixed to element names, associating elements with a longer namespace string. Should not be null; use "" if no namespace.

Since:

4.1

Method Detail

getName

public String getName()

Returns the name of this configuration element.

Specified by:

getName in interface Configuration

Returns:

a String value

getNamespace

public String getNamespace()
                    throws ConfigurationException

Returns the namespace of this configuration element

Specified by:

getNamespace in interface Configuration

Returns:

a String value

Throws:

ConfigurationException - if an error occurs

Since:

4.1

getPrefix

protected String getPrefix()
                    throws ConfigurationException

Returns the prefix of the namespace

Specified by:

getPrefix in class AbstractConfiguration

Returns:

a String value

Throws:

ConfigurationException - if prefix is not present (null).

Since:

4.1

getLocation

public String getLocation()

Returns a description of location of element.

Specified by:

getLocation in interface Configuration

Returns:

a String value

getValue

public String getValue(String defaultValue)

Returns the value of the configuration element as a String.

Specified by:

getValue in interface Configuration

Overrides:

getValue in class AbstractConfiguration

Parameters:

defaultValue - the default value to return if value malformed or empty

Returns:

a String value

getValue

public String getValue()
                throws ConfigurationException

Returns the value of the configuration element as a String.

Specified by:

getValue in interface Configuration

Returns:

a String value

Throws:

ConfigurationException - If the value is not present.

getAttributeNames

public String[] getAttributeNames()

Return an array of all attribute names.

Specified by:

getAttributeNames in interface Configuration

Returns:

a String[] value

getChildren

public Configuration[] getChildren()

Return an array of Configuration elements containing all node children.

Specified by:

getChildren in interface Configuration

Returns:

The child nodes with name

getAttribute

public String getAttribute(String name)
                    throws ConfigurationException

Returns the value of the attribute specified by its name as a String.

Specified by:

getAttribute in interface Configuration

Parameters:

name - a String value

Returns:

a String value

Throws:

ConfigurationException - If the attribute is not present.

getChild

public Configuration getChild(String name,
                              boolean createNew)

Return the first Configuration object child of this associated with the given name.

Specified by:

getChild in interface Configuration

Overrides:

getChild in class AbstractConfiguration

Parameters:

name - a String value

createNew - a boolean value

Returns:

a Configuration value

getChildren

public Configuration[] getChildren(String name)

Return an array of Configuration objects children of this associated with the given name.
The returned array may be empty but is never null.

Specified by:

getChildren in interface Configuration

Parameters:

name - The name of the required children Configuration.

Returns:

a Configuration[] value

appendValueData

public void appendValueData(String value)

Deprecated. Use setValue() instead

Append data to the value of this configuration element.

Parameters:

value - a String value

setValue

public void setValue(String value)

Set the value of this Configuration object to the specified string.

Parameters:

value - a String value

setAttribute

public void setAttribute(String name,
                         String value)

Set the value of the specified attribute to the specified string.

Parameters:

name - name of the attribute to set

value - a String value

addAttribute

public String addAttribute(String name,
                           String value)

Deprecated. Use setAttribute() instead

Add an attribute to this configuration element, returning its old value or null.

Parameters:

name - a String value

value - a String value

Returns:

a String value

addChild

public void addChild(Configuration configuration)

Add a child Configuration to this configuration element.

Parameters:

configuration - a Configuration value

addAll

public void addAll(Configuration other)

Add all the attributes, children and value from specified configuration element to current configuration element.

Parameters:

other - the Configuration element

addAllAttributes

public void addAllAttributes(Configuration other)

Add all attributes from specified configuration element to current configuration element.

Parameters:

other - the Configuration element

addAllChildren

public void addAllChildren(Configuration other)

Add all child Configuration objects from specified configuration element to current configuration element.

Parameters:

other - the other Configuration value

removeChild

public void removeChild(Configuration configuration)

Remove a child Configuration to this configuration element.

Parameters:

configuration - a Configuration value

getChildCount

public int getChildCount()

Return count of children.

Returns:

an int value

makeReadOnly

public void makeReadOnly()

Make this configuration read-only.

checkWriteable

protected final void checkWriteable()
                             throws IllegalStateException

heck if this configuration is writeable.

Throws:

IllegalStateException - if this configuration s read-only