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query.go
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query.go
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package goq
var (
_ Query = (*queryFunc)(nil)
_ Query = and(nil)
_ Query = or(nil)
_ Query = (*not)(nil)
)
// Query is an query to search objects.
type Query interface {
Match(v interface{}) bool
}
type queryFunc struct {
f func(v interface{}) bool
}
func (q *queryFunc) Match(v interface{}) bool {
return q.f(v)
}
// QueryFunc returns a Query which uses f.
func QueryFunc(f func(v interface{}) bool) Query {
return &queryFunc{f: f}
}
// And concats queries into a query
// which Match returns true when all queries Match return true.
func And(qs ...Query) Query {
return and(qs)
}
type and []Query
func (qs and) Match(v interface{}) bool {
for i := range qs {
if !qs[i].Match(v) {
return false
}
}
return true
}
// Or concats queries into a query
// which Match returns false when all queries Match return false.
func Or(qs ...Query) Query {
return or(qs)
}
type or []Query
func (qs or) Match(v interface{}) bool {
for i := range qs {
if qs[i].Match(v) {
return true
}
}
return false
}
// Not return a query which Match returns true
// if given query's Match return false.
func Not(q Query) Query {
return ¬{
Query: q,
}
}
type not struct {
Query
}
func (q *not) Match(v interface{}) bool {
return !q.Query.Match(v)
}