original

[gb-231r1-is01/GB_2.3_IS01.git] / cts / tools / signature-tools / src / signature / compare / model / IDelta.java

diff --git a/cts/tools/signature-tools/src/signature/compare/model/IDelta.java b/cts/tools/signature-tools/src/signature/compare/model/IDelta.java
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+++ b/cts/tools/signature-tools/src/signature/compare/model/IDelta.java
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+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package signature.compare.model;
+
+/**
+ * {@code IDelta} is the common base interface for all delta model elements. It
+ * describes a delta from a "from" element to a "to" element.
+ * 
+ * @param <T>
+ *            the type of the compared elements
+ */
+public interface IDelta<T> {
+
+    /**
+     * Returns the type of this delta.
+     * 
+     * @return the type of this delta
+     */
+    DeltaType getType();
+
+    /**
+     * Returns the "from" element. Is null if type is {@link DeltaType#ADDED}
+     * 
+     * @return the "from" element
+     */
+    T getFrom();
+
+    /**
+     * Returns the "to" element. Is null if type is {@link DeltaType#REMOVED}
+     * 
+     * @return the "to" element
+     */
+    T getTo();
+}