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

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/*
 * 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 dev.gitlive.difflib.patch

/**
 * Describes the change-delta between original and revised texts.
 *
 * @author [Dmitry Naumenko]([email protected])
 * @param  The type of the compared elements in the data 'lines'.
 */
class ChangeDelta
/**
 * Creates a change delta with the two given chunks.
 *
 * @param source The source chunk. Must not be `null`.
 * @param target The target chunk. Must not be `null`.
 */
(source: Chunk, target: Chunk) : AbstractDelta(DeltaType.CHANGE, source, target) {

//    @Throws(PatchFailedException::class)
    override fun applyTo(t: MutableList) {
        verifyChunk(t)
        val position = source.position
        val size = source.size()
        for (i in 0 until size) {
            t.removeAt(position)
        }
        var i = 0
        for (line in target.lines!!) {
            t.add(position + i, line)
            i++
        }
    }

    override fun restore(t: MutableList) {
        val position = target.position
        val size = target.size()
        for (i in 0 until size) {
            t.removeAt(position)
        }
        var i = 0
        for (line in source.lines!!) {
            t.add(position + i, line)
            i++
        }
    }

    override fun toString(): String {
        return ("[ChangeDelta, position: " + source.position + ", lines: "
                + source.lines + " to " + target.lines + "]")
    }
}