Add InputStreamWrapper implementation of NamedStreamable

Author: ianopolous

src/main/java/io/ipfs/api/NamedStreamable.java

@@ -60,6 +60,41 @@ public Optional<String> getName() {
         }
     }
 
+    class InputStreamWrapper implements NamedStreamable {
+        private final Optional<String> name;
+        private final InputStream data;
+
+        public InputStreamWrapper(InputStream data) {
+            this(Optional.empty(), data);
+        }
+
+        public InputStreamWrapper(String name, InputStream data) {
+            this(Optional.of(name), data);
+        }
+
+        public InputStreamWrapper(Optional<String> name, InputStream data) {
+            this.name = name;
+            this.data = data;
+        }
+
+        public boolean isDirectory() {
+            return false;
+        }
+
+        public InputStream getInputStream() {
+            return data;
+        }
+
+        @Override
+        public List<NamedStreamable> getChildren() {
+            return Collections.emptyList();
+        }
+
+        public Optional<String> getName() {
+            return name;
+        }
+    }
+
     class ByteArrayWrapper implements NamedStreamable {
         private final Optional<String> name;
         private final byte[] data;