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| -rw-r--r-- | include/iprt/cpp/restarray.h | 463 |
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diff --git a/include/iprt/cpp/restarray.h b/include/iprt/cpp/restarray.h new file mode 100644 index 00000000..56509c4e --- /dev/null +++ b/include/iprt/cpp/restarray.h @@ -0,0 +1,463 @@ +/** @file + * IPRT - C++ Representational State Transfer (REST) Array Template Class. + */ + +/* + * Copyright (C) 2008-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + +#ifndef IPRT_INCLUDED_cpp_restarray_h +#define IPRT_INCLUDED_cpp_restarray_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cpp/restbase.h> + + +/** @defgroup grp_rt_cpp_restarray C++ Representational State Transfer (REST) Array Template Class. + * @ingroup grp_rt_cpp + * @{ + */ + +/** + * Abstract base class for the RTCRestArray template. + */ +class RT_DECL_CLASS RTCRestArrayBase : public RTCRestObjectBase +{ +public: + /** Default destructor. */ + RTCRestArrayBase() RT_NOEXCEPT; + /** Destructor. */ + virtual ~RTCRestArrayBase(); + + /* Overridden methods: */ + virtual RTCRestObjectBase *baseClone() const RT_NOEXCEPT RT_OVERRIDE; + virtual int resetToDefault() RT_NOEXCEPT RT_OVERRIDE; + virtual RTCRestOutputBase &serializeAsJson(RTCRestOutputBase &a_rDst) const RT_NOEXCEPT RT_OVERRIDE; + virtual int deserializeFromJson(RTCRestJsonCursor const &a_rCursor) RT_NOEXCEPT RT_OVERRIDE; + virtual int toString(RTCString *a_pDst, uint32_t a_fFlags = kCollectionFormat_Unspecified) const RT_NOEXCEPT RT_OVERRIDE; + virtual int fromString(RTCString const &a_rValue, const char *a_pszName, PRTERRINFO a_pErrInfo = NULL, + uint32_t a_fFlags = kCollectionFormat_Unspecified) RT_NOEXCEPT RT_OVERRIDE; + virtual kTypeClass typeClass(void) const RT_NOEXCEPT RT_OVERRIDE; + virtual const char *typeName(void) const RT_NOEXCEPT RT_OVERRIDE; + + /** + * Clear the content of the map. + */ + void clear() RT_NOEXCEPT; + + /** + * Check if an list contains any items. + * + * @return True if there is more than zero items, false otherwise. + */ + inline bool isEmpty() const RT_NOEXCEPT + { + return m_cElements == 0; + } + + /** + * Gets the number of entries in the map. + */ + inline size_t size() const RT_NOEXCEPT + { + return m_cElements; + } + + /** + * Returns the base object pointer at a given index. + * + * @returns The base object at @a a_idx, NULL if out of range. + * @param a_idx The array index. + */ + inline RTCRestObjectBase *atBase(size_t a_idx) RT_NOEXCEPT + { + if (a_idx < m_cElements) + return m_papElements[a_idx]; + return NULL; + } + + /** + * Returns the const base object pointer at a given index. + * + * @returns The base object at @a a_idx, NULL if out of range. + * @param a_idx The array index. + */ + inline RTCRestObjectBase const *atBase(size_t a_idx) const RT_NOEXCEPT + { + if (a_idx < m_cElements) + return m_papElements[a_idx]; + return NULL; + } + + /** + * Removes the element at @a a_idx. + * @returns true if @a a_idx is valid, false if out of range. + * @param a_idx The index of the element to remove. + * The value ~(size_t)0 is an alias for the final element. + */ + bool removeAt(size_t a_idx) RT_NOEXCEPT; + + /** + * Makes sure the array can hold at the given number of entries. + * + * @returns VINF_SUCCESS or VERR_NO_MEMORY. + * @param a_cEnsureCapacity The number of elements to ensure capacity to hold. + */ + int ensureCapacity(size_t a_cEnsureCapacity) RT_NOEXCEPT; + + +protected: + /** The array. */ + RTCRestObjectBase **m_papElements; + /** Number of elements in the array. */ + size_t m_cElements; + /** The number of elements m_papElements can hold. + * The difference between m_cCapacity and m_cElements are all NULLs. */ + size_t m_cCapacity; + + /** + * Helper for creating a clone. + * + * @returns Pointer to new array on success, NULL if out of memory. + */ + virtual RTCRestArrayBase *createClone(void) const RT_NOEXCEPT = 0; + + /** + * Wrapper around the value constructor. + * + * @returns Pointer to new value object on success, NULL if out of memory. + */ + virtual RTCRestObjectBase *createValue(void) RT_NOEXCEPT = 0; + + /** + * For accessing the static deserializeInstanceFromJson() method of the value. + */ + virtual int deserializeValueInstanceFromJson(RTCRestJsonCursor const &a_rCursor, RTCRestObjectBase **a_ppInstance) RT_NOEXCEPT = 0; + + /** + * Worker for the copy assignment method and copyArrayWorkerMayThrow(). + * + * This will use createEntryCopy to do the copying. + * + * @returns VINF_SUCCESS on success, VERR_NO_MEMORY or VERR_NO_STR_MEMORY on failure. + * @param a_rThat The array to copy. Caller makes 100% sure the it has + * the same type as the destination. + */ + int copyArrayWorkerNoThrow(RTCRestArrayBase const &a_rThat) RT_NOEXCEPT; + + /** + * Wrapper around copyArrayWorkerNoThrow for the copy constructor and the + * assignment operator. + */ + void copyArrayWorkerMayThrow(RTCRestArrayBase const &a_rThat); + + /** + * Worker for performing inserts. + * + * @returns VINF_SUCCESS or VWRN_ALREADY_EXISTS on success. + * VERR_ALREADY_EXISTS, VERR_NO_MEMORY or VERR_NO_STR_MEMORY on failure. + * @param a_idx Where to insert it. The value ~(size_t)0 is an alias for m_cElements. + * @param a_pValue The value to insert. Ownership is transferred to the map on success. + * @param a_fReplace Whether to replace existing entry rather than insert. + */ + int insertWorker(size_t a_idx, RTCRestObjectBase *a_pValue, bool a_fReplace) RT_NOEXCEPT; + + /** + * Worker for performing inserts. + * + * @returns VINF_SUCCESS or VWRN_ALREADY_EXISTS on success. + * VERR_ALREADY_EXISTS, VERR_NO_MEMORY or VERR_NO_STR_MEMORY on failure. + * @param a_idx Where to insert it. The value ~(size_t)0 is an alias for m_cElements. + * @param a_rValue The value to copy into the map. + * @param a_fReplace Whether to replace existing key-value pair with matching key. + */ + int insertCopyWorker(size_t a_idx, RTCRestObjectBase const &a_rValue, bool a_fReplace) RT_NOEXCEPT; + +private: + /** Copy constructor on this class should never be used. */ + RTCRestArrayBase(RTCRestArrayBase const &a_rThat); + /** Copy assignment operator on this class should never be used. */ + RTCRestArrayBase &operator=(RTCRestArrayBase const &a_rThat); +}; + + + +/** + * Limited array class. + */ +template<class ElementType> class RTCRestArray : public RTCRestArrayBase +{ +public: + /** Default constructor - empty array. */ + RTCRestArray() RT_NOEXCEPT + : RTCRestArrayBase() + { + } + + /** Destructor. */ + ~RTCRestArray() + { + } + + /** Copy constructor. */ + RTCRestArray(RTCRestArray const &a_rThat) + : RTCRestArrayBase() + { + copyArrayWorkerMayThrow(a_rThat); + } + + /** Copy assignment operator. */ + inline RTCRestArray &operator=(RTCRestArray const &a_rThat) + { + copyArrayWorkerMayThrow(a_rThat); + return *this; + } + + /** Safe copy assignment method. */ + inline int assignCopy(RTCRestArray const &a_rThat) RT_NOEXCEPT + { + return copyArrayWorkerNoThrow(a_rThat); + } + + /** Make a clone of this object. */ + inline RTCRestArray *clone() const RT_NOEXCEPT + { + return (RTCRestArray *)baseClone(); + } + + /** Factory method. */ + static DECLCALLBACK(RTCRestObjectBase *) createInstance(void) RT_NOEXCEPT + { + return new (std::nothrow) RTCRestArray<ElementType>(); + } + + /** Factory method for elements. */ + static DECLCALLBACK(RTCRestObjectBase *) createElementInstance(void) RT_NOEXCEPT + { + return new (std::nothrow) ElementType(); + } + + /** @copydoc RTCRestObjectBase::FNDESERIALIZEINSTANCEFROMJSON */ + static DECLCALLBACK(int) deserializeInstanceFromJson(RTCRestJsonCursor const &a_rCursor, RTCRestObjectBase **a_ppInstance) RT_NOEXCEPT + { + *a_ppInstance = new (std::nothrow) RTCRestArray<ElementType>(); + if (*a_ppInstance) + return (*a_ppInstance)->deserializeFromJson(a_rCursor); + return a_rCursor.m_pPrimary->addError(a_rCursor, VERR_NO_MEMORY, "Out of memory"); + } + + + /** + * Insert the given object at the specified index. + * + * @returns VINF_SUCCESS on success. + * VERR_INVALID_POINTER, VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_idx The insertion index. ~(size_t)0 is an alias for the end. + * @param a_pThat The object to insert. The array takes ownership of the object on success. + */ + inline int insert(size_t a_idx, ElementType *a_pThat) RT_NOEXCEPT + { + return insertWorker(a_idx, a_pThat, false /*a_fReplace*/); + } + + /** + * Insert a copy of the object at the specified index. + * + * @returns VINF_SUCCESS on success. + * VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_idx The insertion index. ~(size_t)0 is an alias for the end. + * @param a_rThat The object to insert a copy of. + */ + inline int insertCopy(size_t a_idx, ElementType const &a_rThat) RT_NOEXCEPT + { + return insertCopyWorker(a_idx, a_rThat, false /*a_fReplace*/); + } + + /** + * Appends the given object to the array. + * + * @returns VINF_SUCCESS on success. + * VERR_INVALID_POINTER, VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_pThat The object to insert. The array takes ownership of the object on success. + */ + inline int append(ElementType *a_pThat) RT_NOEXCEPT + { + return insertWorker(~(size_t)0, a_pThat, false /*a_fReplace*/); + } + + /** + * Appends a copy of the object at the specified index. + * + * @returns VINF_SUCCESS on success. + * VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_rThat The object to insert a copy of. + */ + inline int appendCopy(ElementType const &a_rThat) RT_NOEXCEPT + { + return insertCopyWorker(~(size_t)0, a_rThat, false /*a_fReplace*/); + } + + /** + * Prepends the given object to the array. + * + * @returns VINF_SUCCESS on success. + * VERR_INVALID_POINTER, VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_pThat The object to insert. The array takes ownership of the object on success. + */ + inline int prepend(ElementType *a_pThat) RT_NOEXCEPT + { + return insertWorker(0, a_pThat, false /*a_fReplace*/); + } + + /** + * Prepends a copy of the object at the specified index. + * + * @returns VINF_SUCCESS on success. + * VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_rThat The object to insert a copy of. + */ + inline int prependCopy(ElementType const &a_rThat) RT_NOEXCEPT + { + return insertCopyWorker(0, a_rThat, false /*a_fReplace*/); + } + + /** + * Insert the given object at the specified index. + * + * @returns VINF_SUCCESS on success. + * VERR_INVALID_POINTER, VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_idx The index of the existing object to replace. + * @param a_pThat The replacement object. The array takes ownership of the object on success. + */ + inline int replace(size_t a_idx, ElementType *a_pThat) RT_NOEXCEPT + { + return insertWorker(a_idx, a_pThat, true /*a_fReplace*/); + } + + /** + * Insert a copy of the object at the specified index. + * + * @returns VINF_SUCCESS on success. + * VERR_NO_MEMORY, VERR_NO_STR_MEMORY or VERR_OUT_OF_RANGE on failure. + * @param a_idx The index of the existing object to replace. + * @param a_rThat The object to insert a copy of. + */ + inline int replaceCopy(size_t a_idx, ElementType const &a_rThat) RT_NOEXCEPT + { + return insertCopyWorker(a_idx, a_rThat, true /*a_fReplace*/); + } + + /** + * Returns the object at a given index. + * + * @returns The object at @a a_idx, NULL if out of range. + * @param a_idx The array index. + */ + inline ElementType *at(size_t a_idx) RT_NOEXCEPT + { + if (a_idx < m_cElements) + return (ElementType *)m_papElements[a_idx]; + return NULL; + } + + /** + * Returns the object at a given index, const variant. + * + * @returns The object at @a a_idx, NULL if out of range. + * @param a_idx The array index. + */ + inline ElementType const *at(size_t a_idx) const RT_NOEXCEPT + { + if (a_idx < m_cElements) + return (ElementType const *)m_papElements[a_idx]; + return NULL; + } + + /** + * Returns the first object in the array. + * @returns The first object, NULL if empty. + */ + inline ElementType *first() RT_NOEXCEPT + { + return at(0); + } + + /** + * Returns the first object in the array, const variant. + * @returns The first object, NULL if empty. + */ + inline ElementType const *first() const RT_NOEXCEPT + { + return at(0); + } + + /** + * Returns the last object in the array. + * @returns The last object, NULL if empty. + */ + inline ElementType *last() RT_NOEXCEPT + { + return at(m_cElements - 1); + } + + /** + * Returns the last object in the array, const variant. + * @returns The last object, NULL if empty. + */ + inline ElementType const *last() const RT_NOEXCEPT + { + return at(m_cElements - 1); + } + + +protected: + virtual RTCRestArrayBase *createClone(void) const RT_NOEXCEPT RT_OVERRIDE + { + return new (std::nothrow) RTCRestArray(); + } + + virtual RTCRestObjectBase *createValue(void) RT_NOEXCEPT RT_OVERRIDE + { + return new (std::nothrow) ElementType(); + } + + virtual int deserializeValueInstanceFromJson(RTCRestJsonCursor const &a_rCursor, RTCRestObjectBase **a_ppInstance) RT_NOEXCEPT RT_OVERRIDE + { + return ElementType::deserializeInstanceFromJson(a_rCursor, a_ppInstance); + } +}; + + +/** @} */ + +#endif /* !IPRT_INCLUDED_cpp_restarray_h */ + |