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%% options
copyright owner = Dirk Krause
copyright year = 2013-xxxx
SPDX-License-Identifier: BSD-3-Clause
%% header
#ifndef DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif
#ifndef DK4ERROR_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4error.h"
#else
#include <dktools-4/dk4error.h>
#endif
#endif
#ifndef DK4STO_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4sto.h"
#else
#include <dktools-4/dk4sto.h>
#endif
#endif
#include <stdexcept>
#include <new>
#ifndef DK4COMPARABLE_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "Dk4Comparable.h"
#else
#include <dktools-4/Dk4Comparable.h>
#endif
#endif
/** Namespace to protect Container and Iterator from name collisions.
*/
namespace DkTools4 {
/** Container class for sorted storage.
*/
template<class T> class Container;
/** Iterator class to traverse a Container.
*/
template<class T> class Iterator;
/** A container class for sorted storage.
The objects saved in the storage must be derived from the Comparable
class.
*/
template<class T>
class Container
{
/** Iterator is allowed to access Containers internals.
*/
friend class Iterator<T>;
private:
/** Storage to store elements.
*/
dk4_sto_t *sto;
/** Iterator, used in destructor.
*/
dk4_sto_it_t *it;
/** Comparison criteria for ordering elements.
*/
int cr;
/** Flag: Container is owner of the objects and in charge
for destruction.
*/
bool bOwner;
public:
/** Constructor.
@param crit Sort criteria for objects in container.
@param owner Owner flag value. If a container is the owner
of the objects stored in it, the objects are
deleted in the containers destructor.
Exceptions:
- std::bad_alloc<br>
if there is not enough memory available.
*/
Container<T>(int crit, bool owner = false)
/* throws(std::bad_alloc) */
;
/** Destructor.
*/
~Container<T>();
/** Add an object to the container.
@param ptr Pointer to add.
@return True on success, false on error (object not added).
*/
bool
add(T *ptr);
/** Remove object from container.
@param ptr Pointer to remove.
@return True on success, false on error (element not found).
*/
bool
remove(T *ptr);
/** Check owner flag.
@return Owner flag value.
*/
bool
isOwner(void) const;
/** Reset iterator.
*/
void
reset(void);
/** Set iterator to exact position.
@param data Object to search for.
@param crit Comparison criteria.
@return Pointer to found object on success, NULL otherwise.
*/
T *
findExact(void const *data, int crit);
/** Set iterator to object evaluating equally.
@param data Object to search for.
@param crit Comparison criteria.
@return Pointer to found object on success, NULL otherwise.
*/
T *
findLike(void const *data, int crit);
/** Step to next element.
@return Pointer to next object (if there is one), NULL
if there is no next object.
*/
T *
next(void);
}; /* End of class Container */
/** Iterator class to traverse a Container.
*/
template<class T>
class Iterator
{
private:
/** Low-level iterator.
*/
dk4_sto_it_t *it;
public:
/** Constructor.
@param cont Container for which the iterator is for.
Exceptions:
- std::bad_alloc<br>
if there is not enough memory available.
*/
Iterator<T>(Container<T> & cont)
/* throws(std::bad_alloc) */
;
/** Destructor.
*/
~Iterator<T>();
/** Reset iterator.
*/
void
reset(void);
/** Set iterator to exact position.
@param data Object to search for.
@param crit Comparison criteria.
@return Pointer to found object on success, NULL otherwise.
*/
T *
findExact(void const *data, int crit);
/** Set iterator to object evaluating equally.
@param data Object to search for.
@param crit Comparison criteria.
@return Pointer to found object on success, NULL otherwise.
*/
T *
findLike(void const *data, int crit);
/** Step to next element.
@return Pointe to next object (if there is one), NULL
if there is no next object.
*/
T *
next(void);
}; /* End of class Iterator */
} /* End of namespace DkTools4 */
$*
Implementation for container methods.
$*
template<class T>
DkTools4::Container<T>::Container(int crit, bool owner)
{
bool mustThrow = true; /* Flag: Must throw exception. */
/* Initialize members.
*/
bOwner = owner;
cr = crit;
sto = NULL;
it = NULL;
/* Allocate memory.
*/
sto = dk4sto_open(NULL);
if(NULL != sto) {
dk4sto_set_comp(sto, DkTools4::Comparable::compareTwoPointers, crit);
it = dk4sto_it_open(sto, NULL);
if (NULL != it) {
mustThrow = false; /* All memory allocations succeeded. */
}
else {
dk4sto_close(sto);
sto = NULL;
}
}
if (mustThrow) {
throw(std::bad_alloc());
}
}
/* The destructor is also called when an exception is thrown by
the constructor. So we must check the sto and it component for
being not NULL.
*/
template<class T>
DkTools4::Container<T>::~Container<T>()
{
T *ptr;
/* Close storage and iterator.
If we are the owner of the objects stored, delete the objects too.
*/
if (NULL != it) {
if (bOwner) {
dk4sto_it_reset(it);
while(NULL != (ptr = (T *)dk4sto_it_next(it))) {
delete ptr;
}
}
dk4sto_it_close(it);
}
if (NULL != sto) {
dk4sto_close(sto);
}
/* Mark all components as not allocated.
*/
sto = NULL;
it = NULL;
cr = 0;
bOwner = false;
}
/* The remaining container methods are not called if there was
an exception from the constructor. So no NULL pointer checks
are necessary here.
*/
template<class T>
bool
DkTools4::Container<T>::add(T *ptr)
{
bool back = false;
if(0 != dk4sto_add(sto, (void *)ptr, NULL)) {
back = true;
}
return back;
}
template<class T>
bool
DkTools4::Container<T>::remove(T *ptr)
{
bool back = false;
if(0 != dk4sto_remove(sto, (void *)ptr, NULL)) {
back = true;
}
return back;
}
template<class T>
bool
DkTools4::Container<T>::isOwner(void) const
{
return bOwner;
}
/* The remaining iterator methods are not invoked if the constructor
throws an exception, so we do not need to check the it component.
*/
template<class T>
void
DkTools4::Container<T>::reset(void)
{
dk4sto_it_reset(it);
}
template<class T>
T *
DkTools4::Container<T>::findExact(void const *data, int crit)
{
T *back = NULL;
back = (T *)dk4sto_it_find_exact(it, data);
return back;
}
template<class T>
T *
DkTools4::Container<T>::findLike(void const *data, int crit)
{
T *back;
back = (T *)dk4sto_it_find_like(it, data, crit);
return back;
}
template<class T>
T *
DkTools4::Container<T>::next(void)
{
T *back = NULL;
back = (T *)dk4sto_it_next(it);
return back;
}
$*
Implementation for iterator methods.
$*
template<class T>
DkTools4::Iterator<T>::Iterator(Container<T> & cont)
{
it = dk4sto_it_open(cont.sto, NULL);
if(NULL != it) {
dk4sto_it_reset(it);
}
else {
throw(std::bad_alloc());
}
}
/* The iterators destructor is also invoked if the constructor throws
an exception. So we must check the it component to be not NULL.
*/
template<class T>
DkTools4::Iterator<T>::~Iterator<T>()
{
if (NULL != it) {
dk4sto_it_close(it); it = NULL;
}
}
/* The remaining iterator methods are not invoked if the constructor
throws an exception, so we do not need to check the it component.
*/
template<class T>
void
DkTools4::Iterator<T>::reset(void)
{
dk4sto_it_reset(it);
}
template<class T>
T *
DkTools4::Iterator<T>::findExact(void const *data, int crit)
{
T *back = NULL;
back = (T *)dk4sto_it_find_exact(it, data);
return back;
}
template<class T>
T *
DkTools4::Iterator<T>::findLike(void const *data, int crit)
{
T *back;
back = (T *)dk4sto_it_find_like(it, data, crit);
return back;
}
template<class T>
T *
DkTools4::Iterator<T>::next(void)
{
T *back = NULL;
back = (T *)dk4sto_it_next(it);
return back;
}
/* vim: set ai sw=4 ts=4 : */
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