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// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
import (
"net/url"
"strings"
)
// FetchSourceContext enables source filtering, i.e. it allows control
// over how the _source field is returned with every hit. It is used
// with various endpoints, e.g. when searching for documents, retrieving
// individual documents, or even updating documents.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.5/search-request-source-filtering.html
// for details.
type FetchSourceContext struct {
fetchSource bool
includes []string
excludes []string
}
// NewFetchSourceContext returns a new FetchSourceContext.
func NewFetchSourceContext(fetchSource bool) *FetchSourceContext {
return &FetchSourceContext{
fetchSource: fetchSource,
includes: make([]string, 0),
excludes: make([]string, 0),
}
}
// FetchSource indicates whether to return the _source.
func (fsc *FetchSourceContext) FetchSource() bool {
return fsc.fetchSource
}
// SetFetchSource specifies whether to return the _source.
func (fsc *FetchSourceContext) SetFetchSource(fetchSource bool) {
fsc.fetchSource = fetchSource
}
// Include indicates to return specific parts of the _source.
// Wildcards are allowed here.
func (fsc *FetchSourceContext) Include(includes ...string) *FetchSourceContext {
fsc.includes = append(fsc.includes, includes...)
return fsc
}
// Exclude indicates to exclude specific parts of the _source.
// Wildcards are allowed here.
func (fsc *FetchSourceContext) Exclude(excludes ...string) *FetchSourceContext {
fsc.excludes = append(fsc.excludes, excludes...)
return fsc
}
// Source returns the JSON-serializable data to be used in a body.
func (fsc *FetchSourceContext) Source() (interface{}, error) {
if !fsc.fetchSource {
return false, nil
}
if len(fsc.includes) == 0 && len(fsc.excludes) == 0 {
return true, nil
}
src := make(map[string]interface{})
if len(fsc.includes) > 0 {
src["includes"] = fsc.includes
}
if len(fsc.excludes) > 0 {
src["excludes"] = fsc.excludes
}
return src, nil
}
// Query returns the parameters in a form suitable for a URL query string.
func (fsc *FetchSourceContext) Query() url.Values {
params := url.Values{}
if fsc.fetchSource {
if len(fsc.includes) > 0 {
params.Add("_source_include", strings.Join(fsc.includes, ","))
}
if len(fsc.excludes) > 0 {
params.Add("_source_exclude", strings.Join(fsc.excludes, ","))
}
} else {
params.Add("_source", "false")
}
return params
}
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