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sortiterator.go
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/
sortiterator.go
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package model
import (
"reflect"
"github.com/ungerik/go-start/reflection"
)
func NewSortIterator(iterator Iterator, compareFunc interface{}) *SortIterator {
return &SortIterator{Iterator: iterator, CompareFunc: compareFunc}
}
type SortIterator struct {
Iterator Iterator
CompareFunc interface{}
sliceIterator *SliceIterator
err error
}
func (self *SortIterator) Next(resultRef interface{}) bool {
if self.err != nil {
return false
}
if self.sliceIterator == nil {
f, err := reflection.NewSortCompareFunc(self.CompareFunc)
if err != nil {
self.err = err
return false
}
slice := make([]interface{}, 0, 16)
result := reflect.New(f.ArgType).Interface()
for self.Iterator.Next(result) {
slice = append(slice, result)
result = reflect.New(f.ArgType).Interface()
}
self.err = self.Iterator.Err()
if self.err != nil {
return false
}
self.err = f.Sort(slice)
if self.err != nil {
return false
}
self.sliceIterator = NewSliceIterator(slice)
}
return self.sliceIterator.Next(resultRef)
}
func (self *SortIterator) Err() error {
return self.err
}