Datasources - part 3: TarArchiveDataSource

commons/src/main/java/com/powsybl/commons/datasource/AbstractArchiveDataSource.java

@@ -8,6 +8,7 @@
 package com.powsybl.commons.datasource;
 
 import java.nio.file.Path;
+import java.util.Objects;
 
 /**
  * @author Nicolas Rol {@literal <nicolas.rol at rte-france.com>}
@@ -26,4 +27,17 @@ public abstract class AbstractArchiveDataSource extends AbstractFileSystemDataSo
     protected Path getArchiveFilePath() {
         return directory.resolve(archiveFileName);
     }
+
+    protected ArchiveFormat getArchiveFormat() {
+        return archiveFormat;
+    }
+
+    protected abstract boolean entryExists(Path archiveFilePath, String fileName);
+
+    @Override
+    public boolean exists(String fileName) {
+        Objects.requireNonNull(fileName);
+        Path archiveFilePath = getArchiveFilePath();
+        return entryExists(archiveFilePath, fileName);
+    }
 }

commons/src/main/java/com/powsybl/commons/datasource/ArchiveFormat.java

@@ -15,7 +15,8 @@
  * @author Nicolas Rol {@literal <nicolas.rol at rte-france.com>}
  */
 public enum ArchiveFormat {
-    ZIP("zip");
+    ZIP("zip"),
+    TAR("tar");
 
     ArchiveFormat(String extension) {
         this.extension = Objects.requireNonNull(extension);

commons/src/main/java/com/powsybl/commons/datasource/DataSourceBuilder.java

@@ -69,6 +69,10 @@ DataSource build() {
         // Create the datasource
         if (compressionFormat == CompressionFormat.ZIP || archiveFormat == ArchiveFormat.ZIP) {
             return buildZip();
+        } else if (archiveFormat == ArchiveFormat.TAR) {
+            return archiveFileName == null ?
+                new TarArchiveDataSource(directory, baseName, dataExtension, compressionFormat, observer) :
+                new TarArchiveDataSource(directory, archiveFileName, baseName, dataExtension, compressionFormat, observer);
         } else if (compressionFormat == null) {
             return new DirectoryDataSource(directory, baseName, dataExtension, observer);
         } else {

commons/src/main/java/com/powsybl/commons/datasource/FileInformation.java

@@ -56,10 +56,21 @@ private void computeInformation(String fileName, boolean dataSourceInitializatio
         // File name without the compression extension
         String fileNameWithoutCompressionExtension = compressionFormat == null ? fileName : fileName.substring(0, currentDotIndex);
 
+        // Last dot index
+        currentDotIndex = fileNameWithoutCompressionExtension.lastIndexOf('.');
+
         // Archive extension
         String fileNameWithoutCompressionNorArchive;
-        archiveFormat = compressionFormat == CompressionFormat.ZIP ? ArchiveFormat.ZIP : null;
-        fileNameWithoutCompressionNorArchive = fileNameWithoutCompressionExtension;
+        if (compressionFormat == CompressionFormat.ZIP) {
+            archiveFormat = ArchiveFormat.ZIP;
+            fileNameWithoutCompressionNorArchive = fileNameWithoutCompressionExtension;
+        } else if (ArchiveFormat.TAR.getExtension().equals(fileNameWithoutCompressionExtension.substring(currentDotIndex + 1))) {
+            archiveFormat = ArchiveFormat.TAR;
+            fileNameWithoutCompressionNorArchive = fileNameWithoutCompressionExtension.substring(0, currentDotIndex);
+        } else {
+            archiveFormat = null;
+            fileNameWithoutCompressionNorArchive = fileNameWithoutCompressionExtension;
+        }
 
         // Last dot index
         currentDotIndex = fileNameWithoutCompressionNorArchive.lastIndexOf('.');