juce::PropertySet Class Reference

A set of named property values, which can be strings, integers, floating point, etc. More...

#include <juce_PropertySet.h>

Inheritance diagram for juce::PropertySet:

Collaboration diagram for juce::PropertySet:

Public Member Functions
	PropertySet (bool ignoreCaseOfKeyNames=false)
	Creates an empty PropertySet. More...
	PropertySet (const PropertySet &other)
	Creates a copy of another PropertySet. More...
virtual	~PropertySet ()
	Destructor. More...
void	addAllPropertiesFrom (const PropertySet &source)
	This copies all the values from a source PropertySet to this one. More...
void	clear ()
	Removes all values. More...
bool	containsKey (StringRef keyName) const noexcept
	Returns true if the properies include the given key. More...
XmlElement *	createXml (const String &nodeName) const
	Returns an XML element which encapsulates all the items in this property set. More...
StringPairArray &	getAllProperties () noexcept
	Returns the keys/value pair array containing all the properties. More...
bool	getBoolValue (StringRef keyName, bool defaultReturnValue=false) const noexcept
	Returns one of the properties as an boolean. More...
double	getDoubleValue (StringRef keyName, double defaultReturnValue=0.0) const noexcept
	Returns one of the properties as an double. More...
PropertySet *	getFallbackPropertySet () const noexcept
	Returns the fallback property set. More...
int	getIntValue (StringRef keyName, int defaultReturnValue=0) const noexcept
	Returns one of the properties as an integer. More...
const CriticalSection &	getLock () const noexcept
	Returns the lock used when reading or writing to this set. More...
String	getValue (StringRef keyName, const String &defaultReturnValue=String()) const noexcept
	Returns one of the properties as a string. More...
XmlElement *	getXmlValue (StringRef keyName) const
	Returns one of the properties as an XML element. More...
PropertySet &	operator= (const PropertySet &other)
	Copies another PropertySet over this one. More...
void	removeValue (StringRef keyName)
	Deletes a property. More...
void	restoreFromXml (const XmlElement &xml)
	Reloads a set of properties that were previously stored as XML. More...
void	setFallbackPropertySet (PropertySet *fallbackProperties) noexcept
	Sets up a second PopertySet that will be used to look up any values that aren't set in this one. More...
void	setValue (const String &keyName, const var &value)
	Sets a named property. More...
void	setValue (const String &keyName, const XmlElement *xml)
	Sets a named property to an XML element. More...

Protected Member Functions
virtual void	propertyChanged ()
	Subclasses can override this to be told when one of the properies has been changed. More...

Private Attributes
PropertySet *	fallbackProperties
bool	ignoreCaseOfKeys
CriticalSection	lock
StringPairArray	properties

Detailed Description

A set of named property values, which can be strings, integers, floating point, etc.

Effectively, this just wraps a StringPairArray in an interface that makes it easier to load and save types other than strings.

See the PropertiesFile class for a subclass of this, which automatically broadcasts change messages and saves/loads the list from a file.

{Core}

Constructor & Destructor Documentation

PropertySet() [1/2]

juce::PropertySet::PropertySet

(

bool

ignoreCaseOfKeyNames = false

)

Creates an empty PropertySet.

Parameters

ignoreCaseOfKeyNames

if true, the names of properties are compared in a case-insensitive way

PropertySet() [2/2]

juce::PropertySet::PropertySet

(

const PropertySet &

other

)

Creates a copy of another PropertySet.

~PropertySet()

virtual juce::PropertySet::~PropertySet ( )

virtual

Destructor.

Member Function Documentation

addAllPropertiesFrom()

void juce::PropertySet::addAllPropertiesFrom

(

const PropertySet &

source

)

This copies all the values from a source PropertySet to this one.

This won't remove any existing settings, it just adds any that it finds in the source set.

clear()

void juce::PropertySet::clear

(

)

Removes all values.

containsKey()

bool juce::PropertySet::containsKey ( StringRef  keyName ) const

noexcept

Returns true if the properies include the given key.

createXml()

XmlElement* juce::PropertySet::createXml

(

const String &

nodeName

)

const

Returns an XML element which encapsulates all the items in this property set.

The string parameter is the tag name that should be used for the node.

See also

restoreFromXml

getAllProperties()

StringPairArray& juce::PropertySet::getAllProperties ( )

inlinenoexcept

Returns the keys/value pair array containing all the properties.

getBoolValue()

bool juce::PropertySet::getBoolValue ( StringRef  keyName, bool  defaultReturnValue = false  ) const

noexcept

Returns one of the properties as an boolean.

The result will be true if the string found for this key name can be parsed as a non-zero integer.

If the value isn't found in this set, then this will look for it in a fallback property set (if you've specified one with the setFallbackPropertySet() method), and if it can't find one there, it'll return the default value passed-in.

Parameters

keyName	the name of the property to retrieve
defaultReturnValue	a value to return if the named property doesn't actually exist

getDoubleValue()

double juce::PropertySet::getDoubleValue ( StringRef  keyName, double  defaultReturnValue = 0.0  ) const

noexcept

Returns one of the properties as an double.

If the value isn't found in this set, then this will look for it in a fallback property set (if you've specified one with the setFallbackPropertySet() method), and if it can't find one there, it'll return the default value passed-in.

Parameters

keyName	the name of the property to retrieve
defaultReturnValue	a value to return if the named property doesn't actually exist

getFallbackPropertySet()

PropertySet* juce::PropertySet::getFallbackPropertySet ( ) const

inlinenoexcept

Returns the fallback property set.

See also

setFallbackPropertySet

getIntValue()

int juce::PropertySet::getIntValue ( StringRef  keyName, int  defaultReturnValue = 0  ) const

noexcept

Returns one of the properties as an integer.

If the value isn't found in this set, then this will look for it in a fallback property set (if you've specified one with the setFallbackPropertySet() method), and if it can't find one there, it'll return the default value passed-in.

Parameters

keyName	the name of the property to retrieve
defaultReturnValue	a value to return if the named property doesn't actually exist

getLock()

const CriticalSection& juce::PropertySet::getLock ( ) const

inlinenoexcept

Returns the lock used when reading or writing to this set.

getValue()

String juce::PropertySet::getValue ( StringRef  keyName, const String &  defaultReturnValue = String()  ) const

noexcept

Returns one of the properties as a string.

If the value isn't found in this set, then this will look for it in a fallback property set (if you've specified one with the setFallbackPropertySet() method), and if it can't find one there, it'll return the default value passed-in.

Parameters

keyName	the name of the property to retrieve
defaultReturnValue	a value to return if the named property doesn't actually exist

getXmlValue()

XmlElement* juce::PropertySet::getXmlValue

(

StringRef

keyName

)

const

Returns one of the properties as an XML element.

The result will a new XMLElement object that the caller must delete. If may return nullptr if the key isn't found, or if the entry contains an string that isn't valid XML.

If the value isn't found in this set, then this will look for it in a fallback property set (if you've specified one with the setFallbackPropertySet() method), and if it can't find one there, it'll return the default value passed-in.

Parameters

keyName

the name of the property to retrieve

operator=()

PropertySet& juce::PropertySet::operator=

(

const PropertySet &

other

)

Copies another PropertySet over this one.

propertyChanged()

virtual void juce::PropertySet::propertyChanged ( )

protectedvirtual

Subclasses can override this to be told when one of the properies has been changed.

Reimplemented in juce::PropertiesFile.

removeValue()

void juce::PropertySet::removeValue

(

StringRef

keyName

)

Deletes a property.

Parameters

keyName

the name of the property to delete. (This mustn't be an empty string)

restoreFromXml()

void juce::PropertySet::restoreFromXml

(

const XmlElement &

xml

)

Reloads a set of properties that were previously stored as XML.

The node passed in must have been created by the createXml() method.

See also

createXml

setFallbackPropertySet()

void juce::PropertySet::setFallbackPropertySet ( PropertySet *  fallbackProperties )

noexcept

Sets up a second PopertySet that will be used to look up any values that aren't set in this one.

If you set this up to be a pointer to a second property set, then whenever one of the getValue() methods fails to find an entry in this set, it will look up that value in the fallback set, and if it finds it, it will return that.

Make sure that you don't delete the fallback set while it's still being used by another set! To remove the fallback set, just call this method with a null pointer.

See also

getFallbackPropertySet

setValue() [1/2]

void juce::PropertySet::setValue	(	const String &	keyName,
		const var &	value
	)

Sets a named property.

Parameters

keyName	the name of the property to set. (This mustn't be an empty string)
value	the new value to set it to

setValue() [2/2]

void juce::PropertySet::setValue	(	const String &	keyName,
		const XmlElement *	xml
	)

Sets a named property to an XML element.

Parameters

keyName	the name of the property to set. (This mustn't be an empty string)
xml	the new element to set it to. If this is a nullptr, the value will be set to an empty string

See also

getXmlValue

Member Data Documentation

fallbackProperties

PropertySet* juce::PropertySet::fallbackProperties

private

ignoreCaseOfKeys

bool juce::PropertySet::ignoreCaseOfKeys

private

lock

CriticalSection juce::PropertySet::lock

private

properties

StringPairArray juce::PropertySet::properties

private

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The documentation for this class was generated from the following file:

• juce_PropertySet.h