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The DiffUtils library for computing diffs, applying patches, generationg side-by-side view in Java.

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/*-
 * #%L
 * java-diff-utils
 * %%
 * Copyright (C) 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.
 * #L%
 */
package com.github.difflib.patch;

import java.util.List;

/**
 * Describes the add-delta between original and revised texts.
 *
 * @author Dmitry Naumenko
 * @param T The type of the compared elements in the 'lines'.
 */
public final class InsertDelta extends AbstractDelta {

    /**
     * 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 original, Chunk revised) {
        super(DeltaType.INSERT, original, revised);
    }

    @Override
    public void applyTo(List target) throws PatchFailedException {
        verifyChunk(target);
        int position = this.getSource().getPosition();
        List lines = this.getTarget().getLines();
        for (int i = 0; i < lines.size(); i++) {
            target.add(position + i, lines.get(i));
        }
    }

    @Override
    public void restore(List 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() + "]";
    }
}