added test for range requests with filesystem backend and corrected behavior

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

@@ -567,7 +567,7 @@ public class FilesystemAsyncBlobStore extends BaseAsyncBlobStore {
                   String[] firstLast = s.split("\\-");
                   int offset = Integer.parseInt(firstLast[0]);
                   int last = Integer.parseInt(firstLast[1]);
-                  int length = (last < data.length) ? last + 1 : data.length - offset;
+                  int length = last - offset + 1; // the range end is included
                   out.write(data, offset, length);
                } else {
                   return immediateFailedFuture(new IllegalArgumentException("first and last were null!"));

apis/filesystem/src/test/java/org/jclouds/filesystem/FilesystemAsyncBlobStoreTest.java

@@ -35,7 +35,9 @@ import java.util.Iterator;
 import java.util.Properties;
 import java.util.Set;
 
+import junit.framework.Assert;
 import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.IOUtils;
 import org.jclouds.blobstore.BlobStore;
 import org.jclouds.blobstore.BlobStoreContext;
 import org.jclouds.blobstore.BlobStoreContextFactory;
@@ -51,6 +53,7 @@ import org.jclouds.blobstore.options.ListContainerOptions;
 import org.jclouds.crypto.CryptoStreams;
 import org.jclouds.filesystem.reference.FilesystemConstants;
 import org.jclouds.filesystem.utils.TestUtils;
+import org.jclouds.io.payloads.StringPayload;
 import org.testng.annotations.AfterMethod;
 import org.testng.annotations.BeforeMethod;
 import org.testng.annotations.Test;
@@ -112,7 +115,6 @@ public class FilesystemAsyncBlobStoreTest {
 
     /**
      * Checks if context parameters are managed in the correct way
-    * 
      */
     public void testParameters() {
         // no base directory declared in properties
@@ -707,6 +709,27 @@ public class FilesystemAsyncBlobStoreTest {
         }
     }
 
+    public void testRanges() throws IOException {
+        String payload = "abcdefgh";
+        Blob blob = blobStore.blobBuilder("test").payload(new StringPayload(payload)).build();
+        blobStore.putBlob(CONTAINER_NAME, blob);
+
+        GetOptions getOptionsRangeStartAt = new GetOptions();
+        getOptionsRangeStartAt.startAt(1);
+        Blob blobRangeStartAt = blobStore.getBlob(CONTAINER_NAME, blob.getMetadata().getName(), getOptionsRangeStartAt);
+        Assert.assertEquals("bcdefgh", IOUtils.toString(blobRangeStartAt.getPayload().getInput()));
+
+        GetOptions getOptionsRangeTail = new GetOptions();
+        getOptionsRangeTail.tail(3);
+        Blob blobRangeTail = blobStore.getBlob(CONTAINER_NAME, blob.getMetadata().getName(), getOptionsRangeTail);
+        Assert.assertEquals("fgh", IOUtils.toString(blobRangeTail.getPayload().getInput()));
+
+        GetOptions getOptionsFragment = new GetOptions();
+        getOptionsFragment.range(4, 6);
+        Blob blobFragment = blobStore.getBlob(CONTAINER_NAME, blob.getMetadata().getName(), getOptionsFragment);
+        Assert.assertEquals("efg", IOUtils.toString(blobFragment.getPayload().getInput()));
+    }
+
     // public void testInvalidBlobKey() {
     // try {
     // blobStore.newBlob(File.separator + "testwrongblobkey");

blobstore/src/main/java/org/jclouds/blobstore/options/GetOptions.java

@@ -55,6 +55,9 @@ public class GetOptions {
 
    /**
     * download the specified range of the object.
+    * @param start first offset included in the response
+    * @param end last offset included in the response (inclusive).
+    * @return itself to enable daisy-chaining of expressions
     */
    public GetOptions range(long start, long end) {
       checkArgument(start >= 0, "start must be >= 0");