StringDoubleHash Class Reference

Inheritance diagram for StringDoubleHash:

Collaboration diagram for StringDoubleHash:

Public Member Functions
	StringDoubleHash (int startsize=32)
void	Grow ()
void	Shrink ()
void	SetSize (int newsize)
void	Clear ()
int	Capacity () const
int	Entries () const
double	Double (int i) const
double	Double (const String &key) const
void	SetDouble (int i, double value)
void	SetDouble (const String &key, double value)
int	Add (const String &s, double value)
int	Find (const String &s, double defaultValue)
int	Find (const String &s) const
StringDoubleHash &	operator= (const StringDoubleHash &rhs)
const String &	operator[] (int i) const
String &	operator[] (int i)
void	Delete (unsigned int index)
void	Delete (const String &key)
bool	SlotInUse (int index) const
Public Member Functions inherited from StringHashBase
void	setCaseSensitive (bool caseSensitive)

Protected Attributes
String **	strings
double *	doubles
unsigned int *	keys
unsigned int	count
unsigned int	size
unsigned int	mask
Protected Attributes inherited from StringHashBase
bool	myCaseSensitive

Additional Inherited Members
Protected Member Functions inherited from StringHashBase
bool	stringsEqual (const String &string1, const String &string2) const
unsigned int	getKey (const String &string) const

Detailed Description

Definition at line 309 of file StringHash.h.

Constructor & Destructor Documentation

StringDoubleHash()

StringDoubleHash::StringDoubleHash

(

int

startsize = 32

)

Definition at line 410 of file StringHash.cpp.

    : StringHashBase()
{
    count = 0;
    size  = startsize;
    mask  = startsize - 1;
 
    // In this implementation, the size of hash tables must be a power of two
    if (startsize & mask)
        error("StringDoubleHash: Hash table size must be a power of two.\n");
 
    strings  = new String * [size];
    doubles  = new double [size];
    keys     = new unsigned int [size];
 
    for (unsigned int i = 0; i < size; i++)
        strings[i] = NULL;
};

~StringDoubleHash()

StringDoubleHash::~StringDoubleHash ( )

virtual

Definition at line 429 of file StringHash.cpp.

{
    for (unsigned int i = 0; i < size; i++)
        if (strings[i] != NULL)
            delete strings[i];
 
    if(strings) delete [] strings;
    if(doubles) delete [] doubles;
    if(keys) delete [] keys;
}

Member Function Documentation

Add()

int StringDoubleHash::Add	(	const String &	s,
		double	value
	)

Definition at line 477 of file StringHash.cpp.

{
    unsigned int key = getKey(string);
    unsigned int h   = Iterate(key, string);
 
    if (strings[h] == NULL)
        Insert(h, key, string);
 
    doubles[h] = value;
 
    if (count * 2 > size)
    {
        Grow();
        return Iterate(key, string);
    }
 
    return h;
}

Capacity()

int StringDoubleHash::Capacity ( ) const

inline

Definition at line 335 of file StringHash.h.

    {
        return size;
    }

Clear()

void StringDoubleHash::Clear

(

)

Definition at line 637 of file StringHash.cpp.

{
    for (unsigned int i = 0; i < size; i++)
        if (strings[i] != NULL)
        {
            delete strings[i];
            strings[i] = NULL;
        }
 
    count = 0;
 
    if (size > 256)
        SetSize(256);
}

Delete() [1/2]

void StringDoubleHash::Delete ( const String &  key )

inline

Definition at line 381 of file StringHash.h.

    {
        Delete(Find(key));
    }

Delete() [2/2]

void StringDoubleHash::Delete

(

unsigned int

index

)

Definition at line 527 of file StringHash.cpp.

{
    if (index >= size || strings[index] == NULL)
        return;
 
    delete strings[index];
    strings[index] = NULL;
    count--;
 
    if (count * 8 < size && size > 32)
        Shrink();
    else
    {
        // rehash the next strings until we find empty slot
        index = (index + 1) & mask;
 
        while (strings[index] != NULL)
        {
            if ((keys[index] & mask) != index)
            {
                unsigned int h = Iterate(keys[index], *strings[index]);
 
                if (h != (unsigned int) index)
                {
                    keys[h] = keys[index];
                    strings[h] = strings[index];
                    doubles[h] = doubles[index];
 
                    strings[index] = NULL;
                }
            }
 
            index = (index + 1) & mask;
        }
    }
}

Double() [1/2]

double StringDoubleHash::Double ( const String &  key ) const

inline

Definition at line 348 of file StringHash.h.

    {
        int index = Find(key);
 
        return index >= 0 ? doubles[index] : _NAN_;
    }

Double() [2/2]

double StringDoubleHash::Double ( int  i ) const

inline

Definition at line 344 of file StringHash.h.

    {
        return doubles[i];
    }

Entries()

int StringDoubleHash::Entries ( ) const

inline

Definition at line 339 of file StringHash.h.

    {
        return count;
    }

Find() [1/2]

int StringDoubleHash::Find

(

const String &

s

)

const

Definition at line 516 of file StringHash.cpp.

{
    unsigned int key = getKey(string);
    unsigned int h   = Iterate(key, string);
 
    if (strings[h] == NULL)
        return -1;
 
    return h;
}

Find() [2/2]

int StringDoubleHash::Find	(	const String &	s,
		double	defaultValue
	)

Definition at line 496 of file StringHash.cpp.

{
    unsigned int key = getKey(string);
    unsigned int h   = Iterate(key, string);
 
    if (strings[h] == NULL)
    {
        Insert(h, key, string);
        doubles[h] = defaultValue;
 
        if (count * 2 > size)
        {
            Grow();
            return Iterate(key, string);
        }
    }
 
    return h;
}

Grow()

void StringDoubleHash::Grow ( )

inline

Definition at line 322 of file StringHash.h.

    {
        SetSize(size * 2);
    }

operator=()

StringDoubleHash & StringDoubleHash::operator=

(

const StringDoubleHash &

rhs

)

Definition at line 699 of file StringHash.cpp.

{
    Clear();
 
    for (int i = 0; i < rhs.Capacity(); i++)
        if (rhs.SlotInUse(i))
            Add(*(rhs.strings[i]), rhs.doubles[i]);
 
    return *this;
}

operator[]() [1/2]

String & StringDoubleHash::operator[] ( int  i )

inline

Definition at line 374 of file StringHash.h.

    {
        return *(strings[i]);
    }

operator[]() [2/2]

const String & StringDoubleHash::operator[] ( int  i ) const

inline

Definition at line 370 of file StringHash.h.

    {
        return *(strings[i]);
    }

SetDouble() [1/2]

void StringDoubleHash::SetDouble ( const String &  key, double  value  )

inline

Definition at line 359 of file StringHash.h.

    {
        Add(key, value);
    }

SetDouble() [2/2]

void StringDoubleHash::SetDouble ( int  i, double  value  )

inline

Definition at line 355 of file StringHash.h.

    {
        doubles[i] = value;
    }

SetSize()

void StringDoubleHash::SetSize ( int  newsize )

virtual

Implements StringHashBase.

Definition at line 440 of file StringHash.cpp.

{
    int newmask = newsize - 1;
 
    String   ** newstrings = new String * [newsize];
    double    * newdoubles = new double [newsize];
    unsigned int * newkeys = new unsigned int [newsize];
 
    for (int i = 0; i < newsize; i++)
        newstrings[i] = NULL;
 
    for (unsigned int i = 0; i < size; i++)
        if (strings[i] != NULL)
        {
            unsigned int key = keys[i];
            unsigned int h   = key & newmask;
 
            while (newstrings[h] != NULL &&
                    (newkeys[h] != key || (!stringsEqual(*(newstrings[h]), *(strings[i])))))
                h = (h + 1) & newmask;
 
            newkeys[h] = key;
            newstrings[h] = strings[i];
            newdoubles[h] = doubles[i];
        }
 
    if(strings) delete [] strings;
    if(doubles) delete [] doubles;
    if(keys) delete [] keys;
 
    strings = newstrings;
    doubles = newdoubles;
    keys = newkeys;
    size = newsize;
    mask = newmask;
}

Shrink()

void StringDoubleHash::Shrink ( )

inline

Definition at line 326 of file StringHash.h.

    {
        SetSize(size / 2);
    }

SlotInUse()

bool StringDoubleHash::SlotInUse ( int  index ) const

inline

Definition at line 386 of file StringHash.h.

    {
        return strings[index] != NULL;
    }

Member Data Documentation

count

unsigned int StringDoubleHash::count

protected

Definition at line 315 of file StringHash.h.

doubles

double* StringDoubleHash::doubles

protected

Definition at line 313 of file StringHash.h.

keys

unsigned int* StringDoubleHash::keys

protected

Definition at line 314 of file StringHash.h.

mask

unsigned int StringDoubleHash::mask

protected

Definition at line 316 of file StringHash.h.

size

unsigned int StringDoubleHash::size

protected

Definition at line 315 of file StringHash.h.

strings

String** StringDoubleHash::strings

protected

Definition at line 312 of file StringHash.h.

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

• general/StringHash.h
• general/StringHash.cpp