ipfs-search/ipfs-search

package providerfilters

import (
    "errors"
    "fmt"

    t "github.com/ipfs-search/ipfs-search/types"
)

var (
    errFilter = errors.New("filter error")
)

// MultiFilter efficiently combines multiple filters into a single filter.
type MultiFilter struct {
    filters []Filter
}

// NewMultiFilter returns a pointer to a new MultiFilter.
func NewMultiFilter(filters ...Filter) *MultiFilter {
    return &MultiFilter{
        filters,
    }
}

// Filter takes a Provider and returns true when it is to be included, false
// when not and an error when unexpected condition occur.
func (m *MultiFilter) Filter(p t.Provider) (bool, error) {
    for _, f := range m.filters {
        include, err := f.Filter(p)

        if err != nil {
            return false, fmt.Errorf("%w: %s with filter %v", errFilter, err, f)
        }

        if !include {
            return false, nil
        }
    }

    return true, nil
}