Iterator_Iterators.c

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#include "Iterator_Iterators.h"
 
#include <stdlib.h>
 
 
static const char* _keys[] =   { "One"    , "Two"    , "Three"   };
 
static const char* _values[] = { "Value 1", "Value 2", "Value 3" };
 
 
//=============================================================================
//=============================================================================
 
// Iterator_GetItems()
void Iterator_GetItems(ItemIterator* iterator)
{
    if (iterator != NULL)
    {
        iterator->item.key = NULL;
        iterator->item.value = NULL;
        iterator->iterator = 0; // The iterator field is the index into the data.
    }
}
 
// Iterator_GetItems()
void Iterator_GetKeys(KeyIterator* iterator)
{
    if (iterator != NULL)
    {
        iterator->key = NULL;
        iterator->iterator = 0; // The iterator field is the index into the data.
    }
}
 
// Iterator_GetItems()
void Iterator_GetValues(ValueIterator* iterator)
{
    if (iterator != NULL)
    {
        iterator->value = NULL;
        iterator->iterator = 0; // The iterator field is the index into the data.
    }
}
 
// Iterator_GetItems()
bool Iterator_NextItem(ItemIterator* iterator)
{
    bool retrievedItem = false;
 
    if (iterator != NULL)
    {
        size_t index = iterator->iterator;
        size_t numKeys = sizeof(_keys) / sizeof(_keys[0]);
 
        if (index < numKeys)
        {
            iterator->item.key = _keys[index];
            iterator->item.value = _values[index];
            index++;
            iterator->iterator = index;
            retrievedItem = true;
        }
        else
        {
            iterator->item.key = NULL;
            iterator->item.value = NULL;
        }
    }
 
    return retrievedItem;
}
 
// Iterator_GetItems()
bool Iterator_NextKey(KeyIterator* iterator)
{
    bool retrievedKey = false;
 
    if (iterator != NULL)
    {
        size_t index = iterator->iterator;
        size_t numKeys = sizeof(_keys) / sizeof(_keys[0]);
 
        if (index < numKeys)
        {
            iterator->key = _keys[index];
            index++;
            iterator->iterator = index;
            retrievedKey = true;
        }
        else
        {
            iterator->key = NULL;
        }
    }
 
    return retrievedKey;
}
 
// Iterator_GetItems()
bool Iterator_NextValue(ValueIterator* iterator)
{
    bool retrievedValue = false;
 
    if (iterator != NULL)
    {
        size_t index = iterator->iterator;
        size_t numValues = sizeof(_values) / sizeof(_values[0]);
 
        if (index < numValues)
        {
            iterator->value = _values[index];
            index++;
            iterator->iterator = index;
            retrievedValue = true;
        }
        else
        {
            iterator->value = NULL;
        }
    }
 
    return retrievedValue;
}