1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17 package signature.compare.model; 18 19 /** 20 * {@code IDelta} is the common base interface for all delta model elements. It 21 * describes a delta from a "from" element to a "to" element. 22 * 23 * @param <T> 24 * the type of the compared elements 25 */ 26 public interface IDelta<T> { 27 28 /** 29 * Returns the type of this delta. 30 * 31 * @return the type of this delta 32 */ 33 DeltaType getType(); 34 35 /** 36 * Returns the "from" element. Is null if type is {@link DeltaType#ADDED} 37 * 38 * @return the "from" element 39 */ 40 T getFrom(); 41 42 /** 43 * Returns the "to" element. Is null if type is {@link DeltaType#REMOVED} 44 * 45 * @return the "to" element 46 */ 47 T getTo(); 48 } 49
