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⚡ Bolt: StringBuilder를 활용한 디렉토리 인덱스 문자열 생성 최적화 #43

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⚡ Bolt: StringBuilder를 활용한 디렉토리 인덱스 문자열 생성 최적화 #43

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9 changes: 6 additions & 3 deletions src/main/kotlin/html4tree/main.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -124,18 +124,21 @@ fun process_dir(curr_dir: File){
"""

val index_middle = fun():String{
var l=""
// ⚡ Bolt: 반복문 내에서 문자열 결합(+=) 대신 StringBuilder 사용
// 이렇게 하면 O(N^2)의 문자열 할당을 피할 수 있어 파일 수가 많은 디렉토리에 대해
// 성능이 크게 향상됩니다.
val l = StringBuilder()

val dir_files: MutableList<File> = curr_dir.listFiles()?.toMutableList() ?: mutableListOf()
dir_files.sortWith(compareBy ({it.name}) )
dir_files.forEach {
val isLinkedDirectory = it.isDirectory() && !java.nio.file.Files.isSymbolicLink(it.toPath())
if((it.getName() !in exclude) && (isLinkedDirectory || !it.isDirectory())) {
l += """ <li><a style="display:block; width:100%" href="${if (isLinkedDirectory) { "./${it.getName().urlEncodePath()}/" } else { "./${it.getName().urlEncodePath()}" }}">${if (isLinkedDirectory) { "&#128193;" } else { "&rtrif;" }} ${it.getName().escapeHtml()}</a></li>"""+"\n"
l.append(""" <li><a style="display:block; width:100%" href="${if (isLinkedDirectory) { "./${it.getName().urlEncodePath()}/" } else { "./${it.getName().urlEncodePath()}" }}">${if (isLinkedDirectory) { "&#128193;" } else { "&rtrif;" }} ${it.getName().escapeHtml()}</a></li>"""+"\n")
}
}

return l;
return l.toString();
}

val index_bottom="""
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