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exporter.go
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exporter.go
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// Copyright (C) 2021 CGI France
//
// This file is part of the jsonline library.
//
// The jsonline library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The jsonline library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with the jsonline library. If not, see <http://www.gnu.org/licenses/>.
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent
// modules, and to copy and distribute the resulting executable under
// terms of your choice, provided that you also meet, for each linked
// independent module, the terms and conditions of the license of that
// module. An independent module is a module which is not derived from
// or based on this library. If you modify this library, you may extend
// this exception to your version of the library, but you are not
// obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
package jsonline
import (
"fmt"
"io"
)
const lineSeparator byte = 10
type Exporter interface {
WithTemplate(Template) Exporter
Export(interface{}) error
}
type exporter struct {
w io.Writer
t Template
}
func NewExporter(w io.Writer) Exporter {
return &exporter{
w: w,
t: NewTemplate(),
}
}
func (e *exporter) WithTemplate(t Template) Exporter {
e.t = t
return e
}
func (e *exporter) Export(input interface{}) error {
row, err := e.t.CreateRow(input)
if err != nil {
return fmt.Errorf("%w", err)
}
b, err := row.MarshalJSON()
if err != nil {
return fmt.Errorf("%w", err)
}
b = append(b, lineSeparator)
if _, err := e.w.Write(b); err != nil {
return fmt.Errorf("%w", err)
}
return nil
}