2 // Copyright (c) 2012 Samsung Electronics Co., Ltd.
4 // Licensed under the Apache License, Version 2.0 (the License);
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
8 // http://www.apache.org/licenses/LICENSE-2.0
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
18 * @file FBaseColIEnumerator.h
19 * @brief This is the header file for the %IEnumerator interface.
21 * This header file contains the declarations of the %IEnumerator interface.
24 #ifndef _FBASE_COL_IENUMERATOR_H_
25 #define _FBASE_COL_IENUMERATOR_H_
27 #include <FBaseTypes.h>
28 #include <FBaseObject.h>
30 namespace Tizen { namespace Base { namespace Collection
34 * @interface IEnumerator
35 * @brief This interface supports simple iteration over a collection.
40 * An enumerator remains valid as long as the collection remains unchanged.
41 * If changes are made to the collection, such as adding, modifying, or
42 * deleting elements, the enumerator is irrecoverably invalidated. The next call to GetCurrent(), MoveNext(), or Reset() fails and returns
43 * E_INVALID_OPERATION.
45 * The %IEnumerator interface supports simple iteration over a collection.
46 * One can only access the elements in a collection through %IEnumerator. The elements cannot be modified through this interface.
49 class _OSP_EXPORT_ IEnumerator
53 * This polymorphic destructor should be overridden if required. @n
54 * This way, the destructors of the derived classes are called when the destructor of this interface is called.
58 virtual ~IEnumerator(void) {}
61 * Gets the current object in the collection.
65 * @return The current object in the collection, @n
66 * else @c null if an exception occurs
67 * @exception E_SUCCESS The method is successful.
68 * @exception E_INVALID_OPERATION Either of the following conditions has occurred: @n
69 * - The current state of the instance prohibits the execution of the specified operation. @n
70 * - The enumerator is currently positioned before the first element
71 * or after the last element. @n
72 * - The collection is modified after the enumerator is created.
73 * @remarks The specific error code can be accessed using the GetLastResult() method.
74 * @see GetLastResult()
76 virtual Tizen::Base::Object* GetCurrent(void) const = 0;
79 * Moves %IEnumerator to the next element of the collection. @n
80 * After the enumerator is first created or reset using the Reset() method,
81 * the first call to this method positions the enumerator to the first element in the collection.
85 * @return An error code
86 * @exception E_SUCCESS The method is successful.
87 * @exception E_OUT_OF_RANGE The enumerator has passed the end of the collection.
88 * @exception E_INVALID_OPERATION The current state of the instance prohibits the execution of the specified operation, or
89 * the collection is modified after the enumerator is created.
92 virtual result MoveNext(void) = 0;
95 * Positions the enumerator before the first element in the collection.
99 * @return An error code
100 * @exception E_SUCCESS The method is successful.
101 * @exception E_INVALID_OPERATION The current state of the instance prohibits the execution of the specified operation, or
102 * the collection is modified after the enumerator is created.
104 virtual result Reset(void) = 0;
107 * Gets the reference of the current object in the collection
111 * @return The reference of the pointer to the current object in the collection
112 * @exception E_SUCCESS The method is successful.
113 * @exception E_INVALID_OPERATION Either of the following conditions has occurred: @n
114 * - The current state of the instance prohibits the execution of the specified operation. @n
115 * - The enumerator is currently positioned before the first element
116 * or after the last element. @n
117 * - The collection is modified after the enumerator is created.
118 * @remarks The specific error code can be accessed using the GetLastResult() method.
119 * @see GetLastResult()
121 virtual Tizen::Base::Object*& GetCurrentRef(void) const
123 return Tizen::Base::Object::pNullObj;
128 // This method is for internal use only. Using this method can cause behavioral, security-related,
129 // and consistency-related issues in the application.
130 // This method is reserved and may change its name at any time without prior notice.
134 virtual void IEnumerator_Reserved1(void) { }
138 }}} // Tizen::Base::Collection
140 #endif // _FBASE_COL_IENUMERATOR_H_