62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
package meta
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const (
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FieldsMaskCapacity = 4
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FieldsMaskPartBitSize = 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.SetPartFromInt64(0, v)
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return mask
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}
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type FieldsMaskPart uint64
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func (part FieldsMaskPart) FieldIsDirty(index uint64) bool {
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return (1<<index)&part != 0
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}
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type FieldsMask struct {
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parts [FieldsMaskCapacity]FieldsMaskPart
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}
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func (fm *FieldsMask) SetPartFromUint64(index int, value uint64) {
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fm.parts[index] = FieldsMaskPart(value)
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}
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func (fm *FieldsMask) SetPartFromInt64(index int, value int64) {
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fm.parts[index] = FieldsMaskPart(value)
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}
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func (fm FieldsMask) FieldChanged(index uint64) bool {
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partIndex := fm.partIndex(index)
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fieldIndex := fm.fieldIndex(index)
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part := fm.parts[partIndex]
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return part.FieldIsDirty(fieldIndex)
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}
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func (fm *FieldsMask) SetFieldChanged(index uint64) {
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partIndex := fm.partIndex(index)
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fieldIndex := fm.fieldIndex(index)
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fm.parts[partIndex] |= (1 << fieldIndex)
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}
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func (fm FieldsMask) IsFilled() bool {
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for _, mask := range fm.parts {
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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) partIndex(index uint64) uint64 {
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return index / FieldsMaskPartBitSize
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}
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func (fm FieldsMask) fieldIndex(index uint64) uint64 {
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return index % FieldsMaskPartBitSize
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}
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