Exiv2::LangAltValue Class Reference

Value type for XMP language alternative properties. More...

#include <value.hpp>

Inheritance diagram for Exiv2::LangAltValue:

Public Types

typedef std::auto_ptr
< LangAltValue
AutoPtr
 Shortcut for a LangAltValue auto pointer.
 
typedef std::map< std::string,
std::string,
LangAltValueComparator
ValueType
 Type used to store language alternative arrays.
 
- Public Types inherited from Exiv2::XmpValue
enum  XmpArrayType { xaNone, xaAlt, xaBag, xaSeq }
 XMP array types.
 
enum  XmpStruct { xsNone, xsStruct }
 XMP structure indicator.
 
typedef std::auto_ptr< XmpValueAutoPtr
 Shortcut for a XmpValue auto pointer.
 
- Public Types inherited from Exiv2::Value
typedef std::auto_ptr< ValueAutoPtr
 Shortcut for a Value auto pointer.
 

Public Member Functions

Creators
 LangAltValue ()
 Constructor.
 
 LangAltValue (const std::string &buf)
 Constructor, reads the value from a string.
 
Manipulators
virtual int read (const std::string &buf)
 Read a simple property value from buf and append it to the value. More...
 
Accessors
AutoPtr clone () const
 
virtual long count () const
 Return the number of components of the value.
 
virtual std::string toString (long n) const
 Return the text value associated with the default language qualifier x-default. The parameter n is not used, but it is suggested that only 0 is passed in. Returns an empty string and sets the ok-flag to false if there is no default value.
 
std::string toString (const std::string &qualifier) const
 Return the text value associated with the language qualifier qualifier. Returns an empty string and sets the ok-flag to false if there is no entry for the language qualifier.
 
virtual long toLong (long n=0) const
 Convert the n-th component of the value to a long. The behaviour of this method may be undefined if there is no n-th component. More...
 
virtual float toFloat (long n=0) const
 Convert the n-th component of the value to a float. The behaviour of this method may be undefined if there is no n-th component. More...
 
virtual Rational toRational (long n=0) const
 Convert the n-th component of the value to a Rational. The behaviour of this method may be undefined if there is no n-th component. More...
 
virtual std::ostream & write (std::ostream &os) const
 Write all elements of the value to os, separated by commas. More...
 
- Public Member Functions inherited from Exiv2::XmpValue
 XmpValue (TypeId typeId)
 
XmpArrayType xmpArrayType () const
 Return XMP array type, indicates if an XMP value is an array.
 
XmpStruct xmpStruct () const
 Return XMP struct, indicates if an XMP value is a structure.
 
virtual long size () const
 Return the size of the value in bytes.
 
virtual long copy (byte *buf, ByteOrder byteOrder=invalidByteOrder) const
 Write value to a character data buffer. More...
 
void setXmpArrayType (XmpArrayType xmpArrayType)
 Set the XMP array type to indicate that an XMP value is an array.
 
void setXmpStruct (XmpStruct xmpStruct=xsStruct)
 Set the XMP struct type to indicate that an XMP value is a structure.
 
virtual int read (const byte *buf, long len, ByteOrder byteOrder=invalidByteOrder)
 Read the value from a character buffer. More...
 
- Public Member Functions inherited from Exiv2::Value
 Value (TypeId typeId)
 Constructor, taking a type id to initialize the base class with.
 
virtual ~Value ()
 Virtual destructor.
 
virtual int setDataArea (const byte *buf, long len)
 Set the data area, if the value has one by copying (cloning) the buffer pointed to by buf. More...
 
TypeId typeId () const
 Return the type identifier (Exif data format type).
 
AutoPtr clone () const
 Return an auto-pointer to a copy of itself (deep copy). The caller owns this copy and the auto-pointer ensures that it will be deleted.
 
std::string toString () const
 Return the value as a string. Implemented in terms of write(std::ostream& os) const of the concrete class.
 
virtual long sizeDataArea () const
 Return the size of the data area, 0 if there is none.
 
virtual DataBuf dataArea () const
 Return a copy of the data area if the value has one. The caller owns this copy and DataBuf ensures that it will be deleted. More...
 
bool ok () const
 Check the ok status indicator. After a to<Type> conversion, this indicator shows whether the conversion was successful.
 

Public Attributes

ValueType value_
 Map to store the language alternative values. The language qualifier is used as the key for the map entries.
 

Additional Inherited Members

- Static Public Member Functions inherited from Exiv2::XmpValue
static XmpArrayType xmpArrayType (TypeId typeId)
 Return XMP array type for an array Value TypeId, xaNone if typeId is not an XMP array value type.
 
- Protected Member Functions inherited from Exiv2::XmpValue
XmpValueoperator= (const XmpValue &rhs)
 Assignment operator. Protected so that it can only be used by subclasses but not directly.
 
- Protected Attributes inherited from Exiv2::Value
bool ok_
 Indicates the status of the previous to<Type> conversion.
 

Detailed Description

Value type for XMP language alternative properties.

A language alternative is an array consisting of simple text values, each of which has a language qualifier.

Member Function Documentation

virtual int Exiv2::LangAltValue::read ( const std::string &  buf)
virtual

Read a simple property value from buf and append it to the value.

Appends buf to the value after the last existing array element. Subsequent calls will therefore populate multiple array elements in the order they are read.

The format of buf is:
[lang=["]language code["] ]text
The XMP default language code x-default is used if buf doesn't start with the keyword lang.

Returns
0 if successful.

Implements Exiv2::XmpValue.

virtual float Exiv2::LangAltValue::toFloat ( long  n = 0) const
virtual

Convert the n-th component of the value to a float. The behaviour of this method may be undefined if there is no n-th component.

Returns
The converted value.

Implements Exiv2::Value.

virtual long Exiv2::LangAltValue::toLong ( long  n = 0) const
virtual

Convert the n-th component of the value to a long. The behaviour of this method may be undefined if there is no n-th component.

Returns
The converted value.

Implements Exiv2::Value.

virtual Rational Exiv2::LangAltValue::toRational ( long  n = 0) const
virtual

Convert the n-th component of the value to a Rational. The behaviour of this method may be undefined if there is no n-th component.

Returns
The converted value.

Implements Exiv2::Value.

virtual std::ostream& Exiv2::LangAltValue::write ( std::ostream &  os) const
virtual

Write all elements of the value to os, separated by commas.

Note
The output of this method cannot directly be used as the parameter for read().

Implements Exiv2::Value.


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