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сравнение

src/com/github/difflib/patch/InsertDelta.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2009-2017 java-diff-utils.
+ *
+ * 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 com.github.difflib.patch;
+
+import java.util.List;
+
+/**
+ * Describes the add-delta between original and revised texts.
+ *
+ * @author <a href="dm.naumenko@gmail.com">Dmitry Naumenko</a>
+ * @param <T> The type of the compared elements in the 'lines'.
+ */
+public final class InsertDelta<T> extends AbstractDelta<T> {
+
+    /**
+     * Creates an insert delta with the two given chunks.
+     *
+     * @param original The original chunk. Must not be {@code null}.
+     * @param revised The original chunk. Must not be {@code null}.
+     */
+    public InsertDelta(Chunk<T> original, Chunk<T> revised) {
+        super(DeltaType.INSERT, original, revised);
+    }
+
+    @Override
+    protected void applyTo(List<T> target) throws PatchFailedException {
+        int position = this.getSource().getPosition();
+        List<T> lines = this.getTarget().getLines();
+        for (int i = 0; i < lines.size(); i++) {
+            target.add(position + i, lines.get(i));
+        }
+    }
+
+    @Override
+    protected void restore(List<T> target) {
+        int position = getTarget().getPosition();
+        int size = getTarget().size();
+        for (int i = 0; i < size; i++) {
+            target.remove(position);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "[InsertDelta, position: " + getSource().getPosition()
+                + ", lines: " + getTarget().getLines() + "]";
+    }
+    
+    @Override
+    public AbstractDelta<T> withChunks(Chunk<T> original, Chunk<T> revised) {
+        return new InsertDelta<T>(original, revised);
+    }
+}