escape initial slashe

preserves initial slash in doc ids.

src/com/google/enterprise/adaptor/DocIdCodec.java

diff --git a/src/com/google/enterprise/adaptor/DocIdCodec.java b/src/com/google/enterprise/adaptor/DocIdCodec.java
index 869cc09..dc58c2d 100644
--- a/src/com/google/enterprise/adaptor/DocIdCodec.java
+++ b/src/com/google/enterprise/adaptor/DocIdCodec.java
@@ -48,6 +48,10 @@
       uniqueId = uniqueId.replaceAll("(?<!:)/(?=/)", "/...");
       // Precede index.html and index.htm with "_" to avoid Google eating them.
       uniqueId = uniqueId.replaceFirst("(^|/)(_*index.html?)$", "$1_$2");
+      // If starts with "/" avoid double slash after baseDocUri.
+      if (uniqueId.startsWith("/")) { 
+        uniqueId = "..." + uniqueId;
+      }
       try {
         resource = new URI(null, null, baseDocUri.getPath() + uniqueId, null);
       } catch (URISyntaxException ex) {
@@ -67,6 +71,9 @@
         throw new IllegalArgumentException("URI does not refer to a DocId");
       }
       String id = uri.getPath().substring(basePath.length());
+      if (id.startsWith(".../")) {
+        id = id.substring(3);
+      }
       id = id.replaceFirst("(^|/)_(_*index.html?)$", "$1$2");
       id = id.replaceAll("(?<!:)/\\.\\.\\.(?=/)", "/");
       // Remove three dots from any sequence of only dots that's at least

test/com/google/enterprise/adaptor/DocIdCodecTest.java

diff --git a/test/com/google/enterprise/adaptor/DocIdCodecTest.java b/test/com/google/enterprise/adaptor/DocIdCodecTest.java
index b8e27a7..2bbb04e 100644
--- a/test/com/google/enterprise/adaptor/DocIdCodecTest.java
+++ b/test/com/google/enterprise/adaptor/DocIdCodecTest.java
@@ -130,6 +130,30 @@
   }
 
   @Test
+  public void testBumperSlashes() {
+    String docId = "/mnt/winser/";
+    URI uri = codec.encodeDocId(new DocId(docId));
+    String uriStr = uri.toString();
+    assertTrue(uriStr.startsWith("http://"));
+    assertFalse(uriStr.substring("http://".length()).contains("//"));
+    assertTrue(uriStr.contains("/.../"));
+    assertTrue(uriStr.endsWith("/"));
+    assertEquals(docId, codec.decodeDocId(uri).getUniqueId());
+  }
+
+  @Test
+  public void testBumperSlashes2() {
+    String docId = "///mnt/winser///";
+    URI uri = codec.encodeDocId(new DocId(docId));
+    String uriStr = uri.toString();
+    assertTrue(uriStr.startsWith("http://"));
+    assertFalse(uriStr.substring("http://".length()).contains("//"));
+    assertTrue(uriStr.contains("/.../.../.../"));
+    assertTrue(uriStr.endsWith("r/.../.../"));
+    assertEquals(docId, codec.decodeDocId(uri).getUniqueId());
+  }
+
+  @Test
   public void testDoubleSlashAfterColon3() {
     String docId = "//d:////t//://NOW://.//";
     URI uri = codec.encodeDocId(new DocId(docId));