62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
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package meta
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const (
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FieldsMaskCapacity = 4
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FieldsMaskItemBitSize = 64
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)
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func MakeFieldsMaskFromInt64(v int64) FieldsMask {
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var mask FieldsMask
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mask.SetItemFromInt64(0, v)
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return mask
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}
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type FieldsMaskItem uint64
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func (fmi FieldsMaskItem) FieldIsDirty(index uint64) bool {
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return (1<<index)&fmi != 0
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}
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type FieldsMask struct {
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masks [FieldsMaskCapacity]FieldsMaskItem
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}
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func (fm *FieldsMask) SetItemFromUint64(index int, value uint64) {
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fm.masks[index] = FieldsMaskItem(value)
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}
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func (fm *FieldsMask) SetItemFromInt64(index int, value int64) {
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fm.masks[index] = FieldsMaskItem(value)
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}
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func (fm FieldsMask) FieldChanged(index uint64) bool {
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itemIndex := fm.itemIndex(index)
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maskIndex := fm.maskIndex(index)
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mask := fm.masks[itemIndex]
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return mask.FieldIsDirty(maskIndex)
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}
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func (fm *FieldsMask) SetFieldChanged(index uint64) {
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itemIndex := fm.itemIndex(index)
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maskIndex := fm.maskIndex(index)
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fm.masks[itemIndex] |= (1 << maskIndex)
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}
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func (fm FieldsMask) IsFilled() bool {
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for _, mask := range fm.masks {
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if mask > 0 {
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return true
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}
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}
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return false
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}
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func (fm FieldsMask) itemIndex(index uint64) uint64 {
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return index / FieldsMaskItemBitSize
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}
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func (fm FieldsMask) maskIndex(index uint64) uint64 {
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return index % FieldsMaskItemBitSize
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}
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