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// File: UnicityTable.h
// Description: a class to uniquify objects, manipulating them using integers
// ids.
// Author: Samuel Charron
//
// (C) Copyright 2006, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
///////////////////////////////////////////////////////////////////////
#ifndef TESSERACT_CCUTIL_UNICITY_TABLE_H_
#define TESSERACT_CCUTIL_UNICITY_TABLE_H_
#include "tesscallback.h"
#include "errcode.h"
#include "genericvector.h"
// A class to uniquify objects, manipulating them using integers ids.
// T requirements:
// operator= to add an element
// default-constructible: allocating the internal table will call the default
// constructor.
template <typename T>
class UnicityTable {
public:
UnicityTable();
/// Clear the structures and deallocate internal structures.
~UnicityTable();
/// Reserve some memory. If there is size or more elements, the table will
/// then allocate size * 2 elements.
void reserve(int size);
/// Return the size used.
int size() const;
/// Return the object from an id.
const T &get(int id) const;
// Return the pointer to an object with the given id.
T *get_mutable(int id);
/// Return the id of the T object.
/// This method NEEDS a compare_callback to be passed to
/// set_compare_callback.
int get_id(T object) const;
/// Return true if T is in the table
bool contains(T object) const;
/// Return true if the id is valid
T contains_id(int id) const;
/// Add an element in the table
int push_back(T object);
/// Add a callback to be called to delete the elements when the table took
/// their ownership.
void set_clear_callback(TessCallback1<T>* cb);
/// Add a callback to be called to compare the elements when needed (contains,
/// get_id, ...)
void set_compare_callback(TessResultCallback2<bool, T const &, T const &>* cb);
/// Clear the table, calling the callback function if any.
/// All the owned Callbacks are also deleted.
/// If you don't want the Callbacks to be deleted, before calling clear, set
/// the callback to NULL.
void clear();
/// This method clear the current object, then, does a shallow copy of
/// its argument, and finally invalidate its argument.
void move(UnicityTable<T>* from);
/// Read/Write the table to a file. This does _NOT_ read/write the callbacks.
/// The Callback given must be permanent since they will be called more than
/// once. The given callback will be deleted at the end.
/// Returns false on read/write error.
bool write(FILE* f, TessResultCallback2<bool, FILE*, T const &>* cb) const;
/// swap is used to switch the endianness.
bool read(FILE* f, TessResultCallback3<bool, FILE*, T*, bool>* cb, bool swap);
private:
GenericVector<T> table_;
// Mutable because Run method is not const
mutable TessResultCallback2<bool, T const &, T const &>* compare_cb_;
};
template <typename T>
class UnicityTableEqEq : public UnicityTable<T> {
public:
UnicityTableEqEq() {
UnicityTable<T>::set_compare_callback(
NewPermanentTessCallback(tesseract::cmp_eq<T>));
}
};
template <typename T>
UnicityTable<T>::UnicityTable() :
compare_cb_(0) {
}
template <typename T>
UnicityTable<T>::~UnicityTable() {
clear();
}
template <typename T>
int UnicityTable<T>::size() const{
return table_.size();
}
// Reserve some memory. If there is size or more elements, the table will
// then allocate size * 2 elements.
template <typename T>
void UnicityTable<T>::reserve(int size) {
table_.reserve(size);
}
// Return the object from an id.
template <typename T>
const T &UnicityTable<T>::get(int id) const {
return table_.get(id);
}
// Returns the pointer to the object with the given id.
template <typename T>
T *UnicityTable<T>::get_mutable(int id) {
return &(table_.get(id));
}
// Return true if the id is valid
template <typename T>
T UnicityTable<T>::contains_id(int id) const {
return table_.contains_index(id);
}
// Return the id of the T object.
template <typename T>
int UnicityTable<T>::get_id(T object) const {
return table_.get_index(object);
}
// Return true if T is in the table
template <typename T>
bool UnicityTable<T>::contains(T object) const {
return get_id(object) != -1;
}
// Add an element in the table
template <typename T>
int UnicityTable<T>::push_back(T object) {
int idx = get_id(object);
if (idx == -1) {
idx = table_.push_back(object);
}
return idx;
}
// Add a callback to be called to delete the elements when the table took
// their ownership.
template <typename T>
void UnicityTable<T>::set_clear_callback(TessCallback1<T>* cb) {
table_.set_clear_callback(cb);
}
// Add a callback to be called to delete the elements when the table took
// their ownership.
template <typename T>
void UnicityTable<T>::set_compare_callback(TessResultCallback2<bool, T const &, T const &>* cb) {
table_.set_compare_callback(cb);
compare_cb_ = cb;
}
// Clear the table, calling the callback function if any.
template <typename T>
void UnicityTable<T>::clear() {
table_.clear();
}
template <typename T>
bool UnicityTable<T>::write(
FILE* f, TessResultCallback2<bool, FILE*, T const &>* cb) const {
return table_.write(f, cb);
}
template <typename T>
bool UnicityTable<T>::read(
FILE* f, TessResultCallback3<bool, FILE*, T*, bool>* cb, bool swap) {
return table_.read(f, cb, swap);
}
// This method clear the current object, then, does a shallow copy of
// its argument, and finally invalidate its argument.
template <typename T>
void UnicityTable<T>::move(UnicityTable<T>* from) {
table_.move(&from->table_);
}
#endif // TESSERACT_CCUTIL_UNICITY_TABLE_H_
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