Added has_doc method to Index API.

Allows clean implementation of ZCTextIndex's unindex_object method so that it plays better with ZCatalog's unindex behavior.

lib/python/Products/ZCTextIndex/BaseIndex.py

@@ -150,6 +150,9 @@ class BaseIndex(Persistent):
         # becomes the value of _docweight[docid].
         raise NotImplementedError
         
+    def has_doc(self, docid):
+        return self._docwords.has_key(docid)
+
     # A subclass may wish to extend or override this.
     def unindex_doc(self, docid):
         for wid in unique(self.get_words(docid)):

lib/python/Products/ZCTextIndex/IIndex.py

@@ -66,3 +66,6 @@ class IIndex(Interface.Base):
 
     def unindex_doc(docid):
         "XXX"
+        
+    def has_doc(docid):
+        """Returns true if docid is an id of a document in the index"""

lib/python/Products/ZCTextIndex/ZCTextIndex.py

@@ -118,6 +118,7 @@ class ZCTextIndex(Persistent, Acquisition.Implicit, SimpleItem):
         return count
 
     def unindex_object(self, docid):
+        if self.index.has_doc(docid):
             self.index.unindex_doc(docid)
             self._p_changed = 1 # XXX
 

lib/python/Products/ZCTextIndex/tests/testIndex.py

@@ -29,7 +29,9 @@ class IndexTest(TestCase):
 
     def test_index_document(self, DOCID=1):
         doc = "simple document contains five words"
+        self.assert_(not self.index.has_doc(DOCID))
         self.index.index_doc(DOCID, doc)
+        self.assert_(self.index.has_doc(DOCID))
         self.assert_(self.index._docweight[DOCID])
         self.assertEqual(len(self.index._docweight), 1)
         self.assertEqual(len(self.index._wordinfo), 5)