exporter initial skeleton

exporter/exporter.go

@@ -0,0 +1,49 @@
+package exporter
+
+import (
+	"io"
+	"encoding/json"
+
+	"github.com/google/cayley/graph"
+)
+
+type Exporter struct {
+	wr io.Writer
+	qstore graph.QuadStore
+	err error
+	count int32
+}
+
+func NewExporter(writer io.Writer, qstore graph.QuadStore) *Exporter {
+	return &Exporter{wr: writer, qstore: qstore}
+}
+
+// number of records
+func (exp *Exporter) Count() int32 {
+	return exp.count
+}
+
+//print out the string quoted, escaped
+func (exp *Exporter) WriteEscString(str string) {
+	var esc []byte
+    
+	if exp.err != nil {
+		return
+	}   
+	esc, exp.err = json.Marshal(str)
+	if exp.err != nil {
+		return
+	}   
+	_, exp.err = exp.wr.Write(esc)	
+}
+
+func (exp *Exporter) Write(str string) {
+	if exp.err != nil {
+		return
+	}
+	_, exp.err = exp.wr.Write([]byte(str))
+}
+
+func (exp *Exporter) Err() error {
+	return exp.err
+}