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#ifndef Pegasus_AcceptLanguageList_h
#define Pegasus_AcceptLanguageList_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/LanguageTag.h>

PEGASUS_NAMESPACE_BEGIN

class AcceptLanguageListRep;

//////////////////////////////////////////////////////////////
//
// AcceptLanguageList
//
//////////////////////////////////////////////////////////////

/**
    This class represents an list of languages that a reader can understand
    (as may be specified in an HTTP Accept-Language header value).  It is
    managed as a prioritized list of LanguageTag objects and quality values.
 */
class PEGASUS_COMMON_LINKAGE AcceptLanguageList
{
public:

    /**
        Constructs an empty AcceptLanguageList object.
     */
    AcceptLanguageList();

    /**
        Copy constructor.
        @param acceptLanguages The AcceptLanguageList object to copy.
     */
    AcceptLanguageList(const AcceptLanguageList& acceptLanguages);

    /**
        Destructor.
     */
    ~AcceptLanguageList();

    /**
        Assignment operator.
        @param acceptLanguages The AcceptLanguageList object to copy.
     */
    AcceptLanguageList& operator=(const AcceptLanguageList& acceptLanguages);

    /**
        Returns the number of LanguagesTags in the AcceptLanguageList object.
        @return Integer size of the AcceptLanguageList list.
     */
    Uint32 size() const;

    /**
        Accesses an LanguageTag at a specified index.
        @param index Integer index of the LanguageTag to access.
        Valid indices range from 0 to size()-1.
        @return The LanguageTag corresponding to the specified index.
        @exception IndexOutOfBoundsException If the specified index is out of
        range.
     */
    LanguageTag getLanguageTag(Uint32 index) const;

    /**
        Accesses a quality value at a specified index (corresponding to a
        language tag).
        @param index Integer index of the quality value to access.
        Valid indices range from 0 to size()-1.
        @return The quality value corresponding to the specified index.
        @exception IndexOutOfBoundsException If the specified index is out of
        range.
     */
    Real32 getQualityValue(Uint32 index) const;

    /**
        Inserts a LanguageTag and quality value into the AcceptLanguageList
        object.  The element is inserted in order of descending quality value
        and after any other elements with the same quality value.
        @param languageTag The LanguageTag to insert.
        @param qualityValue The quality value to insert.
     */
    void insert(
        const LanguageTag& languageTag,
        Real32 qualityValue);

    /**
        Removes the specified LanguageTag and quality value from the 
        AcceptLanguageList object.
        @param index Integer index of the element to remove.
        @exception IndexOutOfBoundsException If the specified index is out of
        range.
     */
    void remove(Uint32 index);

    /**
        Finds the first occurrence of the specified LanguageTag in the
        AcceptLanguageList object and returns its index.
        @param languageTag The LanguageTag to find.
        @return Integer index of the element, if found; otherwise
        PEG_NOT_FOUND.
     */
    Uint32 find(const LanguageTag& languageTag) const;

    /**
        Removes all the LanguageTags and quality values from the
        AcceptLanguageList object.
     */
    void clear();

    /**
        Tests AcceptLanguageList objects for equality.
        @param acceptLanguages An AcceptLanguageList object to be compared.
        @return True if the AcceptLanguageList objects contain the same
        LanguageTags and quality values in the same order, false otherwise.
     */
    Boolean operator==(const AcceptLanguageList& acceptLanguages) const;

    /**
        Tests AcceptLanguageList objects for inequality.
        @param acceptLanguages An AcceptLanguageList object to be compared.
        @return False if the AcceptLanguageList objects contain the same
        LanguageTags and quality values in the same order, true otherwise.
     */
    Boolean operator!=(const AcceptLanguageList& acceptLanguages) const;

private:
    AcceptLanguageListRep* _rep;
};

PEGASUS_NAMESPACE_END

#endif