Harmonize filesystem and transient loadBlob

Move getBlob into FilesystemStorageStrategyImpl, similar to
TransientStorageStrategy.

apis/filesystem/src/main/java/org/jclouds/filesystem/FilesystemAsyncBlobStore.java

@@ -343,33 +343,9 @@ public class FilesystemAsyncBlobStore extends BaseAsyncBlobStore {
       return immediateFuture(result);
    }
 
-   /**
-    * Load the blob with the given key belonging to the container with the given
-    * name. There must exist a resource on the file system whose complete name
-    * is given concatenating the container name and the key
-    * 
-    * @param container
-    *           it's the name of the container the blob belongs to
-    * @param key
-    *           it's the key of the blob
-    * 
-    * @return the blob belonging to the given container with the given key
-    */
    private Blob loadBlob(final String container, final String key) {
       logger.debug("Opening blob in container: %s - %s", container, key);
-      BlobBuilder builder = blobUtils.blobBuilder();
+      return storageStrategy.getBlob(container, key);
-      builder.name(key);
-      File file = storageStrategy.getFileForBlobKey(container, key);
-      try {
-         builder.payload(file).calculateMD5();
-      } catch (IOException e) {
-         logger.error("An error occurred calculating MD5 for blob %s from container ", key, container);
-         Throwables.propagateIfPossible(e);
-      }
-      Blob blob = builder.build();
-      if (blob.getPayload().getContentMetadata().getContentMD5() != null)
-         blob.getMetadata().setETag(CryptoStreams.hex(blob.getPayload().getContentMetadata().getContentMD5()));
-      return blob;
    }
 
    protected static class DelimiterFilter implements Predicate<StorageMetadata> {

apis/filesystem/src/main/java/org/jclouds/filesystem/strategy/FilesystemStorageStrategy.java

@@ -123,6 +123,20 @@ public interface FilesystemStorageStrategy {
      */
     boolean blobExists(String container, String key);
 
+   /**
+    * Load the blob with the given key belonging to the container with the given
+    * name. There must exist a resource on the file system whose complete name
+    * is given concatenating the container name and the key
+    *
+    * @param container
+    *           it's the name of the container the blob belongs to
+    * @param key
+    *           it's the key of the blob
+    *
+    * @return the blob belonging to the given container with the given key
+    */
+    Blob getBlob(final String containerName, final String blobName);
+
     /**
      * Returns all the blobs key inside a container
      * @param container

apis/filesystem/src/main/java/org/jclouds/filesystem/strategy/internal/FilesystemStorageStrategyImpl.java

@@ -38,6 +38,7 @@ import org.apache.commons.io.filefilter.DirectoryFileFilter;
 import org.jclouds.blobstore.domain.Blob;
 import org.jclouds.blobstore.domain.BlobBuilder;
 import org.jclouds.blobstore.options.ListContainerOptions;
+import org.jclouds.crypto.CryptoStreams;
 import org.jclouds.filesystem.predicates.validators.FilesystemBlobKeyValidator;
 import org.jclouds.filesystem.predicates.validators.FilesystemContainerNameValidator;
 import org.jclouds.filesystem.reference.FilesystemConstants;
@@ -91,6 +92,23 @@ public class FilesystemStorageStrategyImpl implements FilesystemStorageStrategy
       return buildPathAndChecksIfFileExists(container, key);
    }
 
+   @Override
+   public Blob getBlob(final String container, final String key) {
+      BlobBuilder builder = blobBuilders.get();
+      builder.name(key);
+      File file = getFileForBlobKey(container, key);
+      try {
+         builder.payload(file).calculateMD5();
+      } catch (IOException e) {
+         logger.error("An error occurred calculating MD5 for blob %s from container ", key, container);
+         Throwables.propagateIfPossible(e);
+      }
+      Blob blob = builder.build();
+      if (blob.getPayload().getContentMetadata().getContentMD5() != null)
+         blob.getMetadata().setETag(CryptoStreams.hex(blob.getPayload().getContentMetadata().getContentMD5()));
+      return blob;
+   }
+
    @Override
    public boolean createContainer(String container) {
       logger.debug("Creating container %s", container);