Gleb Koval
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Contributes to #2 . Handle cyclic folders explicitly, instead of relying on the filesystem. Reviewed-on: #3
27 lines
873 B
Kotlin
27 lines
873 B
Kotlin
package filesystem
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// Note sealed allows for simpler logic in FSCreator by guaranteeing FSFile and FSFolder are the only possible FSEntries
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// (as we expect), and it also implicitly makes the class abstract as required.
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sealed class FSEntry(val name: String)
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class FSFile(name: String, val content: String) : FSEntry(name)
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class FSFolder(name: String, val entries: List<FSEntry>) : FSEntry(name) {
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/**
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* Check whether a folder is cyclic.
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*/
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fun isCyclic(): Boolean {
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val seen = listOf(this).toHashSet<FSEntry>()
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val queue = ArrayDeque(entries)
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while (queue.isNotEmpty()) {
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val entry = queue.removeFirst()
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if (!seen.add(entry)) {
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return true
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}
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if (entry is FSFolder) {
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queue.addAll(entry.entries)
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}
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}
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return false
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}
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} |