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>
29 namespace Tizen {namespace Base
34 namespace Tizen { namespace Base { namespace Collection
38 * @interface IEnumerator
39 * @brief This interface supports simple iteration over a collection.
44 * An enumerator remains valid as long as the collection remains unchanged.
45 * If changes are made to the collection, such as adding, modifying, or
46 * deleting elements, the enumerator is irrecoverably invalidated. The next call to GetCurrent(), MoveNext(), or Reset() fails and returns
47 * E_INVALID_OPERATION.
49 * The %IEnumerator interface supports simple iteration over a collection.
50 * One can only access the elements in a collection through %IEnumerator. The elements cannot be modified through this interface.
53 class _OSP_EXPORT_ IEnumerator
57 * This polymorphic destructor should be overridden if required. @n
58 * This way, the destructors of the derived classes are called when the destructor of this interface is called.
62 virtual ~IEnumerator(void) {}
65 * Gets the current object in the collection.
69 * @return The current object in the collection, @n
70 * else @c null if an exception occurs
71 * @exception E_SUCCESS The method is successful.
72 * @exception E_INVALID_OPERATION Either of the following conditions has occurred: @n
73 * - The current state of the instance prohibits the execution of the specified operation. @n
74 * - The enumerator is currently positioned before the first element
75 * or after the last element. @n
76 * - The collection is modified after the enumerator is created.
77 * @remarks The specific error code can be accessed using the GetLastResult() method.
78 * @see GetLastResult()
80 virtual Tizen::Base::Object* GetCurrent(void) const = 0;
83 * Moves %IEnumerator to the next element of the collection. @n
84 * After the enumerator is first created or reset using the Reset() method,
85 * the first call to this method positions the enumerator to the first element in the collection.
89 * @return An error code
90 * @exception E_SUCCESS The method is successful.
91 * @exception E_OUT_OF_RANGE The enumerator has passed the end of the collection.
92 * @exception E_INVALID_OPERATION The current state of the instance prohibits the execution of the specified operation, or
93 * the collection is modified after the enumerator is created.
96 virtual result MoveNext(void) = 0;
99 * Positions the enumerator before the first element in the collection.
103 * @return An error code
104 * @exception E_SUCCESS The method is successful.
105 * @exception E_INVALID_OPERATION The current state of the instance prohibits the execution of the specified operation, or
106 * the collection is modified after the enumerator is created.
108 virtual result Reset(void) = 0;
112 // This method is for internal use only. Using this method can cause behavioral, security-related,
113 // and consistency-related issues in the application.
114 // This method is reserved and may change its name at any time without prior notice.
118 virtual void IEnumerator_Reserved1(void) { }
122 // This method is for internal use only. Using this method can cause behavioral, security-related,
123 // and consistency-related issues in the application.
124 // This method is reserved and may change its name at any time without prior notice.
128 virtual void IEnumerator_Reserved2(void) { }
132 }}} // Tizen::Base::Collection
134 #endif // _FBASE_COL_IENUMERATOR_H_