Library: Util
Package: Configuration
Header: Poco/Util/AbstractConfiguration.h
Description
AbstractConfiguration is an abstract base class for different kinds of configuration data, such as INI files, property files, XML configuration files or the Windows Registry.
Configuration property keys have a hierarchical format, consisting of names separated by periods. The exact interpretation of key names is up to the actual subclass implementation of AbstractConfiguration. Keys are case sensitive.
All public methods are synchronized, so the class is safe for multithreaded use. AbstractConfiguration implements reference counting based garbage collection.
Subclasses must override the getRaw(), setRaw() and enumerate() methods.
Inheritance
Direct Base Classes: Poco::RefCountedObject
All Base Classes: Poco::RefCountedObject
Known Derived Classes: IniFileConfiguration, MapConfiguration, Poco::OSP::Configuration, Poco::OSP::BundleProperties, Poco::OSP::Preferences, ConfigurationMapper, XMLConfiguration, ConfigurationView, LayeredConfiguration, SystemConfiguration, FilesystemConfiguration, WinRegistryConfiguration, PropertyFileConfiguration
Member Summary
Member Functions: createView, enableEvents, enumerate, eventsEnabled, expand, getBool, getDouble, getInt, getRaw, getRawString, getString, has, hasOption, hasProperty, keys, parseBool, parseInt, remove, removeRaw, setBool, setDouble, setInt, setRaw, setRawWithEvent, setString
Inherited Functions: duplicate, referenceCount, release
Nested Classes
class KeyValue
A key-value pair, used as event argument. 
Types
Keys
typedef std::vector < std::string > Keys;
Constructors
AbstractConfiguration
Creates the AbstractConfiguration.
Destructor
~AbstractConfiguration 
virtual ~AbstractConfiguration();
Member Functions
createView
const AbstractConfiguration * createView(
const std::string & prefix
) const;
Creates a non-mutable view (see ConfigurationView) into the configuration.
createView
AbstractConfiguration * createView(
const std::string & prefix
);
Creates a view (see ConfigurationView) into the configuration.
enableEvents
void enableEvents(
bool enable = true
);
Enables (or disables) events.
eventsEnabled
bool eventsEnabled() const;
Returns true if and only if events are enabled.
expand
std::string expand(
const std::string & value
) const;
Replaces all occurences of ${<property>} in value with the value of the <property>. If <property> does not exist, nothing is changed.
If a circular property reference is detected, a CircularReferenceException will be thrown.
getBool
bool getBool(
const std::string & key
) const;
Returns the boolean value of the property with the given name. Throws a NotFoundException if the key does not exist. Throws a SyntaxException if the property can not be converted to a boolean. If the value contains references to other properties (${<property>}), these are expanded.
getBool
bool getBool(
const std::string & key,
bool defaultValue
) const;
If a property with the given key exists, returns the property's boolean value, otherwise returns the given default value. Throws a SyntaxException if the property can not be converted to a boolean. The following string values can be converted into a boolean:
- numerical values: non zero becomes true, zero becomes false
- strings: true, yes, on become true, false, no, off become false
Case does not matter. If the value contains references to other properties (${<property>}), these are expanded.
getDouble
double getDouble(
const std::string & key
) const;
Returns the double value of the property with the given name. Throws a NotFoundException if the key does not exist. Throws a SyntaxException if the property can not be converted to a double. If the value contains references to other properties (${<property>}), these are expanded.
getDouble
double getDouble(
const std::string & key,
double defaultValue
) const;
If a property with the given key exists, returns the property's double value, otherwise returns the given default value. Throws a SyntaxException if the property can not be converted to an double. If the value contains references to other properties (${<property>}), these are expanded.
getInt
int getInt(
const std::string & key
) const;
Returns the int value of the property with the given name. Throws a NotFoundException if the key does not exist. Throws a SyntaxException if the property can not be converted to an int. Numbers starting with 0x are treated as hexadecimal. If the value contains references to other properties (${<property>}), these are expanded.
getInt
int getInt(
const std::string & key,
int defaultValue
) const;
If a property with the given key exists, returns the property's int value, otherwise returns the given default value. Throws a SyntaxException if the property can not be converted to an int. Numbers starting with 0x are treated as hexadecimal. If the value contains references to other properties (${<property>}), these are expanded.
getRawString
std::string getRawString(
const std::string & key
) const;
Returns the raw string value of the property with the given name. Throws a NotFoundException if the key does not exist. References to other properties are not expanded.
getRawString
std::string getRawString(
const std::string & key,
const std::string & defaultValue
) const;
If a property with the given key exists, returns the property's raw string value, otherwise returns the given default value. References to other properties are not expanded.
getString
std::string getString(
const std::string & key
) const;
Returns the string value of the property with the given name. Throws a NotFoundException if the key does not exist. If the value contains references to other properties (${<property>}), these are expanded.
getString
std::string getString(
const std::string & key,
const std::string & defaultValue
) const;
If a property with the given key exists, returns the property's string value, otherwise returns the given default value. If the value contains references to other properties (${<property>}), these are expanded.
has
bool has(
const std::string & key
) const;
Returns true if and only if the property with the given key exists.
Same as hasProperty().
hasOption
bool hasOption(
const std::string & key
) const;
Returns true if and only if the property with the given key exists.
Same as hasProperty().
hasProperty
bool hasProperty(
const std::string & key
) const;
Returns true if and only if the property with the given key exists.
keys
void keys(
Keys & range
) const;
Returns in range the names of all keys at root level.
keys
void keys(
const std::string & key,
Keys & range
) const;
Returns in range the names of all subkeys under the given key. If an empty key is passed, all root level keys are returned.
remove
void remove(
const std::string & key
);
Removes the property with the given key.
Does nothing if the key does not exist.
setBool
void setBool(
const std::string & key,
bool value
);
Sets the property with the given key to the given value. An already existing value for the key is overwritten.
setDouble
void setDouble(
const std::string & key,
double value
);
Sets the property with the given key to the given value. An already existing value for the key is overwritten.
setInt
void setInt(
const std::string & key,
int value
);
Sets the property with the given key to the given value. An already existing value for the key is overwritten.
setString
void setString(
const std::string & key,
const std::string & value
);
Sets the property with the given key to the given value. An already existing value for the key is overwritten.
enumerate
virtual void enumerate(
const std::string & key,
Keys & range
) const = 0;
Returns in range the names of all subkeys under the given key. If an empty key is passed, all root level keys are returned.
getRaw
virtual bool getRaw(
const std::string & key,
std::string & value
) const = 0;
If the property with the given key exists, stores the property's value in value and returns true. Otherwise, returns false.
Must be overridden by subclasses.
parseBool 
static bool parseBool(
const std::string & value
);
parseInt
static int parseInt(
const std::string & value
);
removeRaw
virtual void removeRaw(
const std::string & key
);
Removes the property with the given key.
Does nothing if the key does not exist.
Should be overridden by subclasses; the default implementation throws a Poco::NotImplementedException.
setRaw
virtual void setRaw(
const std::string & key,
const std::string & value
) = 0;
Sets the property with the given key to the given value. An already existing value for the key is overwritten.
Must be overridden by subclasses.
setRawWithEvent
void setRawWithEvent(
const std::string & key,
std::string value
);
Variables
propertyChanged
Poco::BasicEvent < const KeyValue > propertyChanged;
Fired after a property value has been changed or a property has been created.
propertyChanging
Poco::BasicEvent < KeyValue > propertyChanging;
Fired before a property value is changed or a new property is created.
Can be used to check or fix a property value, or to cancel the change by throwing an exception.
The event delegate can use one of the get...() functions to obtain the current property value.
propertyRemoved
Poco::BasicEvent < const std::string > propertyRemoved;
Fired after a property has been removed by a call to remove().
propertyRemoving
Poco::BasicEvent < const std::string > propertyRemoving;
Fired before a property is removed by a call to remove().
Note: This will even be fired if the key does not exist and the remove operation will fail with an exception.