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, MutableConfiguration, java.io.Serializable

public class DefaultConfiguration

extends AbstractConfiguration

implements MutableConfiguration, java.io.Serializable

This is the default Configuration implementation.

Version:

CVS $Revision: 1.43 $ $Date: 2004/02/11 14:34:25 $

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(Configuration config)
Shallow copy constructor, suitable for craeting a writable clone of a read-only configuration.

DefaultConfiguration(java.lang.String name)
Create a new DefaultConfiguration instance.

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

DefaultConfiguration(java.lang.String name, java.lang.String location, java.lang.String ns, java.lang.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.
java.lang.String	addAttribute(java.lang.String name, java.lang.String value) Deprecated. Use setAttribute() instead
void	addChild(Configuration configuration) Add a child Configuration to this configuration element.
void	appendValueData(java.lang.String value) Deprecated. Use setValue() instead
protected void	checkWriteable() heck if this configuration is writeable.
boolean	equals(java.lang.Object other) Compare if this configuration is equal to another.
java.lang.String	getAttribute(java.lang.String name) Returns the value of the attribute specified by its name as a String.
java.lang.String[]	getAttributeNames() Return an array of all attribute names.
Configuration	getChild(java.lang.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(java.lang.String name) Return an array of Configuration objects children of this associated with the given name.
java.lang.String	getLocation() Returns a description of location of element.
MutableConfiguration	getMutableChild(java.lang.String name) Equivalent to getMutableChild( name, true )
MutableConfiguration	getMutableChild(java.lang.String name, boolean autoCreate) Gets a child node of this configuration.
MutableConfiguration[]	getMutableChildren() Returns an array of mutable children.
MutableConfiguration[]	getMutableChildren(java.lang.String name) Returns an array of mutable children with the given name.
java.lang.String	getName() Returns the name of this configuration element.
java.lang.String	getNamespace() Returns the namespace of this configuration element
protected java.lang.String	getPrefix() Returns the prefix of the namespace
java.lang.String	getValue() Returns the value of the configuration element as a String.
java.lang.String	getValue(java.lang.String defaultValue) Returns the value of the configuration element as a String.
int	hashCode() Obtaine the hashcode for this configuration.
protected boolean	isReadOnly() Returns true iff this DefaultConfiguration has been made read-only.
void	makeReadOnly() Make this configuration read-only.
void	removeChild(Configuration configuration) Remove a child Configuration to this configuration element.
void	setAttribute(java.lang.String name, boolean value) Set the value of the specified attribute to the specified boolean.
void	setAttribute(java.lang.String name, float value) Set the value of the specified attribute to the specified float.
void	setAttribute(java.lang.String name, int value) Set the value of the specified attribute to the specified int.
void	setAttribute(java.lang.String name, long value) Set the value of the specified attribute to the specified long.
void	setAttribute(java.lang.String name, java.lang.String value) Set the value of the specified attribute to the specified string.
void	setValue(boolean value) Set the value of this Configuration object to the specified boolean.
void	setValue(float value) Set the value of this Configuration object to the specified float.
void	setValue(int value) Set the value of this Configuration object to the specified int.
void	setValue(long value) Set the value of this Configuration object to the specified long.
void	setValue(java.lang.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, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.avalon.framework.configuration.Configuration

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

Field Detail

EMPTY_ARRAY

protected static final Configuration[] EMPTY_ARRAY

An empty (length zero) array of configuration objects.

Constructor Detail

DefaultConfiguration

public DefaultConfiguration(Configuration config)
                     throws ConfigurationException

Shallow copy constructor, suitable for craeting a writable clone of a read-only configuration. To modify children, use getChild(), removeChild() and addChild().

Parameters:

config - the Configuration to copy

Throws:

ConfigurationException - if an error occurs when copying

DefaultConfiguration

public DefaultConfiguration(java.lang.String name)

Create a new DefaultConfiguration instance.

Parameters:

name - a String value

DefaultConfiguration

public DefaultConfiguration(java.lang.String name,
                            java.lang.String location)

Create a new DefaultConfiguration instance.

Parameters:

name - a String value

location - a String value

DefaultConfiguration

public DefaultConfiguration(java.lang.String name,
                            java.lang.String location,
                            java.lang.String ns,
                            java.lang.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 java.lang.String getName()

Returns the name of this configuration element.

Specified by:

getName in interface Configuration

Returns:

a String value

getNamespace

public java.lang.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 java.lang.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 java.lang.String getLocation()

Returns a description of location of element.

Specified by:

getLocation in interface Configuration

Returns:

a String value

getValue

public java.lang.String getValue(java.lang.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 java.lang.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 java.lang.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 java.lang.String getAttribute(java.lang.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(java.lang.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(java.lang.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(java.lang.String value)

Deprecated. Use setValue() instead

Append data to the value of this configuration element.

Parameters:

value - a String value

setValue

public void setValue(java.lang.String value)

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

Specified by:

setValue in interface MutableConfiguration

Parameters:

value - a String value

setValue

public void setValue(int value)

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

Specified by:

setValue in interface MutableConfiguration

Parameters:

value - a int value

setValue

public void setValue(long value)

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

Specified by:

setValue in interface MutableConfiguration

Parameters:

value - a long value

setValue

public void setValue(boolean value)

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

Specified by:

setValue in interface MutableConfiguration

Parameters:

value - a boolean value

setValue

public void setValue(float value)

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

Specified by:

setValue in interface MutableConfiguration

Parameters:

value - a float value

setAttribute

public void setAttribute(java.lang.String name,
                         java.lang.String value)

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

Specified by:

setAttribute in interface MutableConfiguration

Parameters:

name - name of the attribute to set

value - a String value

setAttribute

public void setAttribute(java.lang.String name,
                         int value)

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

Specified by:

setAttribute in interface MutableConfiguration

Parameters:

name - name of the attribute to set

value - an int value

setAttribute

public void setAttribute(java.lang.String name,
                         long value)

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

Specified by:

setAttribute in interface MutableConfiguration

Parameters:

name - name of the attribute to set

value - an long value

setAttribute

public void setAttribute(java.lang.String name,
                         boolean value)

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

Specified by:

setAttribute in interface MutableConfiguration

Parameters:

name - name of the attribute to set

value - an boolean value

setAttribute

public void setAttribute(java.lang.String name,
                         float value)

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

Specified by:

setAttribute in interface MutableConfiguration

Parameters:

name - name of the attribute to set

value - an float value

addAttribute

public java.lang.String addAttribute(java.lang.String name,
                                     java.lang.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.

Specified by:

addChild in interface MutableConfiguration

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.

Specified by:

addAll in interface MutableConfiguration

Parameters:

other - the Configuration element

addAllAttributes

public void addAllAttributes(Configuration other)

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

Specified by:

addAllAttributes in interface MutableConfiguration

Parameters:

other - the Configuration element

addAllChildren

public void addAllChildren(Configuration other)

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

Specified by:

addAllChildren in interface MutableConfiguration

Parameters:

other - the other Configuration value

removeChild

public void removeChild(Configuration configuration)

Remove a child Configuration to this configuration element.

Specified by:

removeChild in interface MutableConfiguration

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 java.lang.IllegalStateException

heck if this configuration is writeable.

Throws:

java.lang.IllegalStateException - if this configuration s read-only

isReadOnly

protected final boolean isReadOnly()

Returns true iff this DefaultConfiguration has been made read-only.

getMutableChild

public MutableConfiguration getMutableChild(java.lang.String name)
                                     throws ConfigurationException

Description copied from interface: MutableConfiguration

Equivalent to getMutableChild( name, true )

Specified by:

getMutableChild in interface MutableConfiguration

Throws:

ConfigurationException

getMutableChild

public MutableConfiguration getMutableChild(java.lang.String name,
                                            boolean autoCreate)
                                     throws ConfigurationException

Description copied from interface: MutableConfiguration

Gets a child node of this configuration. If a mutable child with the given name exists, it is returned. If an immutable child with the given name exists, it is converted into a mutable child and returned. In this case, the immutable child will be replaced with the mutable child in this configuration (that is, it will be as if the child node always had been mutable). If no child with the given name exists, and autoCreate is true, a new mutable child is created and added to this configuration before being returned.

Specified by:

getMutableChild in interface MutableConfiguration

Parameters:

name - the name of the child.

autoCreate - set to true to create the child node if it doesn't exist.

Returns:

the child MutableConfiguration, or null if autoCreate was false and no child by the given name existed.

Throws:

ConfigurationException - if an error occurrs.

getMutableChildren

public MutableConfiguration[] getMutableChildren()
                                          throws ConfigurationException

Description copied from interface: MutableConfiguration

Returns an array of mutable children. Immutable children are converted just as for getMutableChild.

Specified by:

getMutableChildren in interface MutableConfiguration

Throws:

ConfigurationException - if an error occurrs.

getMutableChildren

public MutableConfiguration[] getMutableChildren(java.lang.String name)
                                          throws ConfigurationException

Description copied from interface: MutableConfiguration

Returns an array of mutable children with the given name. Immutable children are converted just as for getMutableChild.

Specified by:

getMutableChildren in interface MutableConfiguration

Throws:

ConfigurationException - if an error occurrs.

equals

public boolean equals(java.lang.Object other)

Compare if this configuration is equal to another.

Parameters:

other - The other configuration

Returns:

true if they are the same.

hashCode

public int hashCode()

Obtaine the hashcode for this configuration.

Returns:

the hashcode.