OAK-11448: Remove usage of Guava Files.readLines()

oak-commons/src/test/java/org/apache/jackrabbit/oak/commons/sort/ExternalSortTest.java

@@ -18,7 +18,6 @@
 
 import net.jpountz.lz4.LZ4FrameInputStream;
 import net.jpountz.lz4.LZ4FrameOutputStream;
-import org.apache.jackrabbit.guava.common.io.Files;
 import org.apache.jackrabbit.oak.commons.Compression;
 import org.junit.After;
 import org.junit.Before;
@@ -41,6 +40,7 @@
 import java.nio.channels.FileChannel;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -457,8 +457,8 @@ private File convertPlainFileToCompressedFileBasedOnCompressionAlgorithm(File un
                                                                              File compressedFile) throws IOException {
         try (BufferedWriter bufferedWriter = new BufferedWriter(
                 new OutputStreamWriter(algorithm.getOutputStream(new FileOutputStream(compressedFile)),
-                        Charset.defaultCharset()));) {
-            Files.readLines(uncompressedInputFile, Charset.defaultCharset()).forEach(n -> {
+                        Charset.defaultCharset()))) {
+            Files.lines(uncompressedInputFile.toPath()).forEach(n -> {
                 try {
                     bufferedWriter.write(n + "\n");
                 } catch (IOException e) {
@@ -511,7 +511,7 @@ public void customType() throws Exception {
         Collections.sort(testLines);
 
         List<TestLine> linesFromSortedFile = new ArrayList<>();
-        Files.readLines(out, charset).forEach(line -> linesFromSortedFile.add(new TestLine(line)));
+        Files.lines(out.toPath()).forEach(line -> linesFromSortedFile.add(new TestLine(line)));
 
         assertEquals(testLines, linesFromSortedFile);
 

oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/index/datastore/DataStoreTextWriter.java

@@ -29,6 +29,7 @@
 import java.util.HashSet;
 import java.util.Set;
 import java.util.concurrent.Callable;
+import java.util.stream.Collectors;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.jackrabbit.oak.api.Blob;
@@ -230,11 +231,11 @@ public String toString() {
     }
 
     private Set<String> loadFromFile(File file) throws IOException {
-        Set<String> result = new HashSet<>();
         if (file.exists()) {
-            result.addAll(org.apache.jackrabbit.guava.common.io.Files.readLines(file, StandardCharsets.UTF_8));
+            return Files.lines(file.toPath()).collect(Collectors.toSet());
+        } else {
+            return new HashSet<>();
         }
-        return result;
     }
 
     private void writeToFile(String fileName, Set<String> blobIds) throws IOException {

oak-segment-tar/src/test/java/org/apache/jackrabbit/oak/segment/file/JournalEntryTest.java

@@ -16,7 +16,6 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-
 package org.apache.jackrabbit.oak.segment.file;
 
 import static org.apache.jackrabbit.oak.segment.file.FileStoreBuilder.fileStoreBuilder;
@@ -25,11 +24,10 @@
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;
-import java.nio.charset.Charset;
+import java.nio.file.Files;
 import java.util.List;
 
 import org.apache.jackrabbit.guava.common.base.Splitter;
-import org.apache.jackrabbit.guava.common.io.Files;
 import org.apache.jackrabbit.oak.segment.SegmentNodeStore;
 import org.apache.jackrabbit.oak.segment.SegmentNodeStoreBuilders;
 import org.apache.jackrabbit.oak.segment.file.tar.LocalJournalFile;
@@ -70,7 +68,7 @@ public void timestampInJournalEntry() throws Exception{
         fileStore.close();
 
         File journal = new File(tempFolder.getRoot(), "journal.log");
-        List<String> lines = Files.readLines(journal, Charset.defaultCharset());
+        List<String> lines = Files.readAllLines(journal.toPath());
         assertFalse(lines.isEmpty());
 
         String line = lines.get(0);