1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/xorm.io/builder/cond.go b/vendor/xorm.io/builder/cond.go
new file mode 100644
index 0000000000..e44173bbd5
--- /dev/null
+++ b/vendor/xorm.io/builder/cond.go
@@ -0,0 +1,74 @@
+// Copyright 2016 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package builder
+
+import (
+	"io"
+)
+
+// Writer defines the interface
+type Writer interface {
+	io.Writer
+	Append(...interface{})
+}
+
+var _ Writer = NewWriter()
+
+// BytesWriter implments Writer and save SQL in bytes.Buffer
+type BytesWriter struct {
+	writer *StringBuilder
+	args   []interface{}
+}
+
+// NewWriter creates a new string writer
+func NewWriter() *BytesWriter {
+	w := &BytesWriter{
+		writer: &StringBuilder{},
+	}
+	return w
+}
+
+// Write writes data to Writer
+func (s *BytesWriter) Write(buf []byte) (int, error) {
+	return s.writer.Write(buf)
+}
+
+// Append appends args to Writer
+func (s *BytesWriter) Append(args ...interface{}) {
+	s.args = append(s.args, args...)
+}
+
+// Cond defines an interface
+type Cond interface {
+	WriteTo(Writer) error
+	And(...Cond) Cond
+	Or(...Cond) Cond
+	IsValid() bool
+}
+
+type condEmpty struct{}
+
+var _ Cond = condEmpty{}
+
+// NewCond creates an empty condition
+func NewCond() Cond {
+	return condEmpty{}
+}
+
+func (condEmpty) WriteTo(w Writer) error {
+	return nil
+}
+
+func (condEmpty) And(conds ...Cond) Cond {
+	return And(conds...)
+}
+
+func (condEmpty) Or(conds ...Cond) Cond {
+	return Or(conds...)
+}
+
+func (condEmpty) IsValid() bool {
+	return false
+}