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107 changes: 107 additions & 0 deletions
107
src/main/java/org/cryptomator/frontend/fuse/FileNameTranscoder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package org.cryptomator.frontend.fuse; | ||
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| import com.google.common.base.Preconditions; | ||
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| import java.nio.ByteBuffer; | ||
| import java.nio.charset.Charset; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.text.Normalizer; | ||
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| /** | ||
| * Class to transcode filenames and path components from one encoding to another. | ||
| * <p> | ||
| * Instances created with {@link FileNameTranscoder#transcoder()} default to fuse and nio UTF-8 encoding with NFC normalization. To change encoding and normalization, use the supplied "withXXX()" methods. If an encoding is not part of the UTF famlily, the normalization is ignored. | ||
| */ | ||
| public class FileNameTranscoder { | ||
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| private static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8; | ||
| private static final Normalizer.Form DEFAULT_NORMALIZATION = Normalizer.Form.NFC; | ||
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| private final Charset fuseCharset; | ||
| private final Charset nioCharset; | ||
| private final Normalizer.Form fuseNormalization; | ||
| private final Normalizer.Form nioNormalization; | ||
| private final boolean fuseCharsetIsUnicode; | ||
| private final boolean nioCharsetIsUnicode; | ||
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| FileNameTranscoder(Charset fuseCharset, Charset nioCharset, Normalizer.Form fuseNormalization, Normalizer.Form nioNormalization) { | ||
| this.fuseCharset = Preconditions.checkNotNull(fuseCharset); | ||
| this.nioCharset = Preconditions.checkNotNull(nioCharset); | ||
| this.fuseNormalization = Preconditions.checkNotNull(fuseNormalization); | ||
| this.nioNormalization = Preconditions.checkNotNull(nioNormalization); | ||
| this.fuseCharsetIsUnicode = fuseCharset.name().startsWith("UTF"); | ||
| this.nioCharsetIsUnicode = nioCharset.name().startsWith("UTF"); | ||
| } | ||
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| /** | ||
| * Transcodes the given NIO file name to FUSE representation. | ||
| * | ||
| * @param nioFileName A file name encoded with the charset used in NIO | ||
| * @return The file name encoded with the charset used by FUSE | ||
| */ | ||
| public String nioToFuse(String nioFileName) { | ||
| return transcode(nioFileName, nioCharset, fuseCharset, nioNormalization, fuseNormalization, fuseCharsetIsUnicode); | ||
| } | ||
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| /** | ||
| * Transcodes the given FUSE file name to NIO representation. | ||
| * | ||
| * @param fuseFileName A file name encoded with the charset used in FUSE | ||
| * @return The file name encoded with the charset used by NIO | ||
| */ | ||
| public String fuseToNio(String fuseFileName) { | ||
| return transcode(fuseFileName, fuseCharset, nioCharset, fuseNormalization, nioNormalization, nioCharsetIsUnicode); | ||
| } | ||
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| /** | ||
| * Interprets the given string as FUSE character set encoded and returns the original byte sequence. | ||
| * | ||
| * @param fuseFileName string from the fuse layer | ||
| * @return A byte sequence with the original encoding of the input | ||
| */ | ||
| public ByteBuffer interpretAsFuseString(String fuseFileName) { | ||
| return fuseCharset.encode(fuseFileName); | ||
| } | ||
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| /** | ||
| * Interprets the given string as NIO character set encoded and returns the original byte sequence. | ||
| * | ||
| * @param nioFileName string from the nio layer | ||
| * @return A byte sequence with the original encoding of the input | ||
| */ | ||
| public ByteBuffer interpretAsNioString(String nioFileName) { | ||
| return nioCharset.encode(nioFileName); | ||
| } | ||
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| private String transcode(String original, Charset srcCharset, Charset dstCharset, Normalizer.Form srcNormalization, Normalizer.Form dstNormalization, boolean applyNormalization) { | ||
| String result = original; | ||
| if (!srcCharset.equals(dstCharset)) { | ||
| result = dstCharset.decode(srcCharset.encode(result)).toString(); | ||
| } | ||
| if (applyNormalization && srcNormalization != dstNormalization) { | ||
| result = Normalizer.normalize(result, dstNormalization); | ||
| } | ||
| return result; | ||
| } | ||
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| /* Builder/Wither */ | ||
| public FileNameTranscoder withFuseCharset(Charset fuseCharset) { | ||
| return new FileNameTranscoder(fuseCharset, nioCharset, fuseNormalization, nioNormalization); | ||
| } | ||
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| public FileNameTranscoder withNioCharset(Charset nioCharset) { | ||
| return new FileNameTranscoder(fuseCharset, nioCharset, fuseNormalization, nioNormalization); | ||
| } | ||
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| public FileNameTranscoder withFuseNormalization(Normalizer.Form fuseNormalization) { | ||
| return new FileNameTranscoder(fuseCharset, nioCharset, fuseNormalization, nioNormalization); | ||
| } | ||
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| public FileNameTranscoder withNioNormalization(Normalizer.Form nioNormalization) { | ||
| return new FileNameTranscoder(fuseCharset, nioCharset, fuseNormalization, nioNormalization); | ||
| } | ||
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| public static FileNameTranscoder transcoder() { | ||
| return new FileNameTranscoder(DEFAULT_CHARSET, DEFAULT_CHARSET, DEFAULT_NORMALIZATION, DEFAULT_NORMALIZATION); | ||
| } | ||
| } |
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