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ResourceData.kt
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ResourceData.kt
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package app.revanced.patcher.data.impl
import app.revanced.patcher.data.Data
import org.w3c.dom.Document
import java.io.Closeable
import java.io.File
import java.io.InputStream
import java.io.OutputStream
import javax.xml.parsers.DocumentBuilderFactory
import javax.xml.transform.TransformerFactory
import javax.xml.transform.dom.DOMSource
import javax.xml.transform.stream.StreamResult
class ResourceData(private val resourceCacheDirectory: File) : Data, Iterable<File> {
val xmlEditor = XmlFileHolder()
operator fun get(path: String) = resourceCacheDirectory.resolve(path)
override fun iterator() = resourceCacheDirectory.walkTopDown().iterator()
inner class XmlFileHolder {
operator fun get(inputStream: InputStream, outputStream: OutputStream) =
DomFileEditor(inputStream, lazyOf(outputStream))
operator fun get(path: String) = DomFileEditor(this@ResourceData[path])
}
}
class DomFileEditor internal constructor(inputStream: InputStream, private val outputStream: Lazy<OutputStream>) : Closeable {
// lazily open an output stream
// this is required because when constructing a DomFileEditor the output stream is created along with the input stream, which is not allowed
// the workaround is to lazily create the output stream. This way it would be used after the input stream is closed, which happens in the constructor
constructor(file: File) : this(file.inputStream(), lazy { file.outputStream() })
val file: Document =
DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(inputStream).also(Document::normalize)
override fun close() =
TransformerFactory.newInstance().newTransformer().transform(DOMSource(file), StreamResult(outputStream.value))
}