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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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 com.intellij.util.indexing;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.util.ShutDownTracker;
import com.intellij.openapi.vfs.newvfs.persistent.ContentHashesUtil;
import com.intellij.openapi.vfs.newvfs.persistent.FlushingDaemon;
import com.intellij.util.io.IOUtil;
import org.jetbrains.annotations.NotNull;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.MessageDigest;
/**
* @author Maxim.Mossienko
* @since 4/10/2014.
*/
class ContentHashesSupport {
private static volatile ContentHashesUtil.HashEnumerator ourHashesWithFileType;
static void initContentHashesEnumerator() throws IOException {
if (ourHashesWithFileType != null) return;
synchronized (ContentHashesSupport.class) {
if (ourHashesWithFileType != null) return;
ContentHashesUtil.HashEnumerator hashEnumerator = null;
final File hashEnumeratorFile = new File(IndexInfrastructure.getPersistentIndexRoot(), "hashesWithFileType");
try {
hashEnumerator = new ContentHashesUtil.HashEnumerator(hashEnumeratorFile, null);
FlushingDaemon.everyFiveSeconds(new Runnable() {
@Override
public void run() {
flushContentHashes();
}
});
ShutDownTracker.getInstance().registerShutdownTask(new Runnable() {
@Override
public void run() {
flushContentHashes();
}
});
ourHashesWithFileType = hashEnumerator;
} catch (IOException ex) {
IOUtil.deleteAllFilesStartingWith(hashEnumeratorFile);
throw ex;
}
}
}
static void flushContentHashes() {
if (ourHashesWithFileType.isDirty()) ourHashesWithFileType.force();
}
static int calcContentHashIdWithFileType(@NotNull byte[] bytes, @NotNull FileType fileType) throws IOException {
return enumerateHash(calcContentHashWithFileType(bytes, fileType));
}
static int enumerateHash(@NotNull byte[] digest) throws IOException {
return ourHashesWithFileType.enumerate(digest);
}
static byte[] calcContentHashWithFileType(@NotNull byte[] bytes, @NotNull FileType fileType) throws IOException {
MessageDigest messageDigest = ContentHashesUtil.HASHER_CACHE.getValue();
Charset defaultCharset = Charset.defaultCharset();
messageDigest.update(fileType.getName().getBytes(defaultCharset));
messageDigest.update((byte)0);
messageDigest.update(String.valueOf(bytes.length).getBytes(defaultCharset));
messageDigest.update((byte)0);
messageDigest.update(bytes, 0, bytes.length);
return messageDigest.digest();
}
}
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