| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package arrow |
| |
| import ( |
| "reflect" |
| "unsafe" |
| |
| "github.com/apache/arrow/go/arrow/endian" |
| ) |
| |
| var ( |
| MonthIntervalTraits monthTraits |
| DayTimeIntervalTraits daytimeTraits |
| ) |
| |
| // MonthInterval traits |
| |
| const ( |
| // MonthIntervalSizeBytes specifies the number of bytes required to store a single MonthInterval in memory |
| MonthIntervalSizeBytes = int(unsafe.Sizeof(MonthInterval(0))) |
| ) |
| |
| type monthTraits struct{} |
| |
| // BytesRequired returns the number of bytes required to store n elements in memory. |
| func (monthTraits) BytesRequired(n int) int { return MonthIntervalSizeBytes * n } |
| |
| // PutValue |
| func (monthTraits) PutValue(b []byte, v MonthInterval) { |
| endian.Native.PutUint32(b, uint32(v)) |
| } |
| |
| // CastFromBytes reinterprets the slice b to a slice of type MonthInterval. |
| // |
| // NOTE: len(b) must be a multiple of MonthIntervalSizeBytes. |
| func (monthTraits) CastFromBytes(b []byte) []MonthInterval { |
| h := (*reflect.SliceHeader)(unsafe.Pointer(&b)) |
| |
| var res []MonthInterval |
| s := (*reflect.SliceHeader)(unsafe.Pointer(&res)) |
| s.Data = h.Data |
| s.Len = h.Len / MonthIntervalSizeBytes |
| s.Cap = h.Cap / MonthIntervalSizeBytes |
| |
| return res |
| } |
| |
| // CastToBytes reinterprets the slice b to a slice of bytes. |
| func (monthTraits) CastToBytes(b []MonthInterval) []byte { |
| h := (*reflect.SliceHeader)(unsafe.Pointer(&b)) |
| |
| var res []byte |
| s := (*reflect.SliceHeader)(unsafe.Pointer(&res)) |
| s.Data = h.Data |
| s.Len = h.Len * MonthIntervalSizeBytes |
| s.Cap = h.Cap * MonthIntervalSizeBytes |
| |
| return res |
| } |
| |
| // Copy copies src to dst. |
| func (monthTraits) Copy(dst, src []MonthInterval) { copy(dst, src) } |
| |
| // DayTimeInterval traits |
| |
| const ( |
| // DayTimeIntervalSizeBytes specifies the number of bytes required to store a single DayTimeInterval in memory |
| DayTimeIntervalSizeBytes = int(unsafe.Sizeof(DayTimeInterval{})) |
| ) |
| |
| type daytimeTraits struct{} |
| |
| // BytesRequired returns the number of bytes required to store n elements in memory. |
| func (daytimeTraits) BytesRequired(n int) int { return DayTimeIntervalSizeBytes * n } |
| |
| // PutValue |
| func (daytimeTraits) PutValue(b []byte, v DayTimeInterval) { |
| endian.Native.PutUint32(b[0:4], uint32(v.Days)) |
| endian.Native.PutUint32(b[4:8], uint32(v.Milliseconds)) |
| } |
| |
| // CastFromBytes reinterprets the slice b to a slice of type DayTimeInterval. |
| // |
| // NOTE: len(b) must be a multiple of DayTimeIntervalSizeBytes. |
| func (daytimeTraits) CastFromBytes(b []byte) []DayTimeInterval { |
| h := (*reflect.SliceHeader)(unsafe.Pointer(&b)) |
| |
| var res []DayTimeInterval |
| s := (*reflect.SliceHeader)(unsafe.Pointer(&res)) |
| s.Data = h.Data |
| s.Len = h.Len / DayTimeIntervalSizeBytes |
| s.Cap = h.Cap / DayTimeIntervalSizeBytes |
| |
| return res |
| } |
| |
| // CastToBytes reinterprets the slice b to a slice of bytes. |
| func (daytimeTraits) CastToBytes(b []DayTimeInterval) []byte { |
| h := (*reflect.SliceHeader)(unsafe.Pointer(&b)) |
| |
| var res []byte |
| s := (*reflect.SliceHeader)(unsafe.Pointer(&res)) |
| s.Data = h.Data |
| s.Len = h.Len * DayTimeIntervalSizeBytes |
| s.Cap = h.Cap * DayTimeIntervalSizeBytes |
| |
| return res |
| } |
| |
| // Copy copies src to dst. |
| func (daytimeTraits) Copy(dst, src []DayTimeInterval) { copy(dst, src) } |