Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

error.go

@@ -0,0 +1,54 @@
+//  Copyright (c) 2014 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bleve
+
+// Constant Error values which can be compared to determine the type of error
+const (
+	ErrorIndexPathExists Error = iota
+	ErrorIndexPathDoesNotExist
+	ErrorIndexMetaMissing
+	ErrorIndexMetaCorrupt
+	ErrorIndexClosed
+	ErrorAliasMulti
+	ErrorAliasEmpty
+	ErrorUnknownIndexType
+	ErrorEmptyID
+	ErrorIndexReadInconsistency
+	ErrorTwoPhaseSearchInconsistency
+	ErrorSynonymSearchNotSupported
+)
+
+// Error represents a more strongly typed bleve error for detecting
+// and handling specific types of errors.
+type Error int
+
+func (e Error) Error() string {
+	return errorMessages[e]
+}
+
+var errorMessages = map[Error]string{
+	ErrorIndexPathExists:             "cannot create new index, path already exists",
+	ErrorIndexPathDoesNotExist:       "cannot open index, path does not exist",
+	ErrorIndexMetaMissing:            "cannot open index, metadata missing",
+	ErrorIndexMetaCorrupt:            "cannot open index, metadata corrupt",
+	ErrorIndexClosed:                 "index is closed",
+	ErrorAliasMulti:                  "cannot perform single index operation on multiple index alias",
+	ErrorAliasEmpty:                  "cannot perform operation on empty alias",
+	ErrorUnknownIndexType:            "unknown index type",
+	ErrorEmptyID:                     "document ID cannot be empty",
+	ErrorIndexReadInconsistency:      "index read inconsistency detected",
+	ErrorTwoPhaseSearchInconsistency: "2-phase search failed, likely due to an overlapping topology change",
+	ErrorSynonymSearchNotSupported:   "synonym search not supported",
+}