weka.core

Class Settings

java.lang.Object

weka.core.Settings

All Implemented Interfaces:

Serializable

public class Settings
extends Object
implements Serializable

Maintains a collection of settings. Settings are key value pairs which can be grouped together under a given name. All settings managed by an instance of this class are persisted in the central metastore under a given store name. For example, the store name could be the name/ID of an application/ system, and settings could be grouped according to applications, components, panels etc. Default settings (managed by Defaults objects) can be applied to provide initial defaults (or to allow new settings that have yet to be persisted to be added in the future).

Version:

$Revision: $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com)

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Settings.SettingKey Class implementing a key for a setting.

Constructor Summary

Constructors

Constructor and Description
Settings(String storeName, String ID) Construct a new Settings object to be stored in the supplied store under the given ID/name

Method Summary

Modifier and Type	Method and Description
void	applyDefaults(Defaults defaults) Applies a set of default settings.
String	getID() Get the ID used for these settings
<T> T	getSetting(String ID, Settings.SettingKey key, T defaultValue) Get the value of a setting
<T> T	getSetting(String ID, Settings.SettingKey key, T defaultValue, Environment env) Get the value of a setting
<T> T	getSetting(String ID, String key, T defaultValue, Environment env)
Map<Settings.SettingKey,Object>	getSettings(String settingsID) Get the settings for a given ID
Set<String>	getSettingsIDs() Get a list of settings IDs
String	getStoreName() Get the store name for these settings
boolean	hasSetting(String settingsID, String propName) Returns true if a given setting has a value
boolean	hasSettings(String settingsID) Returns true if there are settings available for a given ID
void	loadSettings() Load the settings with ID m_ID from store m_storeName.
void	saveSettings() Save the settings to the metastore
void	setSetting(String ID, Settings.SettingKey propName, Object value) Set a value for a setting.

Methods inherited from class java.lang.Object

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

Constructor Detail

Settings

public Settings(String storeName,
                String ID)

Construct a new Settings object to be stored in the supplied store under the given ID/name

Parameters:

storeName - the name of the store to load/save to in the metastore

ID - the ID/name to use

Method Detail

loadSettings

public void loadSettings()
                  throws IOException

Load the settings with ID m_ID from store m_storeName.

Throws:

IOException - if a problem occurs

getID

public String getID()

Get the ID used for these settings

Returns:

the ID used

getStoreName

public String getStoreName()

Get the store name for these settings

Returns:

the store name

applyDefaults

public void applyDefaults(Defaults defaults)

Applies a set of default settings. If the ID of default settings is not known then a new entry is made for it. Otherwise we examine all settings in the default set supplied and add any that we don't have a value for.

Parameters:

defaults - the defaults to apply

getSettings

public Map<Settings.SettingKey,Object> getSettings(String settingsID)

Get the settings for a given ID

Parameters:

settingsID - the ID to get settings for

Returns:

a map of settings, or null if the given ID is unknown

getSettingsIDs

public Set<String> getSettingsIDs()

Get a list of settings IDs

Returns:

a list of the settings IDs managed by this settings instance

getSetting

public <T> T getSetting(String ID,
                        String key,
                        T defaultValue,
                        Environment env)

getSetting

public <T> T getSetting(String ID,
                        Settings.SettingKey key,
                        T defaultValue)

Get the value of a setting

Type Parameters:

T - the type of the vaue

Parameters:

ID - the ID for settings map to lookup (typically the ID of a perspective)

key - the name of the setting value to lookup

defaultValue - the default value to use if the setting is not known

Returns:

the setting value, or the default value if not found

getSetting

public <T> T getSetting(String ID,
                        Settings.SettingKey key,
                        T defaultValue,
                        Environment env)

Get the value of a setting

Type Parameters:

T - the type of the vaue

Parameters:

ID - the ID for settings map to lookup (typically the ID of a perspective)

key - the name of the setting value to lookup

defaultValue - the default value to use if the setting is not known

env - environment variables to use. String setting values will have environment variables replaced automatically

Returns:

the setting value, or the default value if not found

setSetting

public void setSetting(String ID,
                       Settings.SettingKey propName,
                       Object value)

Set a value for a setting.

Parameters:

ID - the for the settings map to store the setting in (typically the ID of a perspective or application)

propName - the name of the setting to store

value - the value of the setting to store

hasSettings

public boolean hasSettings(String settingsID)

Returns true if there are settings available for a given ID

Parameters:

settingsID - the ID to check

Returns:

true if there are settings available for that ID

hasSetting

public boolean hasSetting(String settingsID,
                          String propName)

Returns true if a given setting has a value

Parameters:

settingsID - the ID of the settings group

propName - the actual setting to check for

Returns:

true if the setting has a value

saveSettings

public void saveSettings()
                  throws IOException

Save the settings to the metastore

Throws:

IOException - if a problem occurs