| // 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 array |
| |
| import ( |
| "sync/atomic" |
| |
| "github.com/apache/arrow/go/arrow" |
| "github.com/apache/arrow/go/arrow/bitutil" |
| "github.com/apache/arrow/go/arrow/float16" |
| "github.com/apache/arrow/go/arrow/internal/debug" |
| "github.com/apache/arrow/go/arrow/memory" |
| ) |
| |
| type Float16Builder struct { |
| builder |
| |
| data *memory.Buffer |
| rawData []float16.Num |
| } |
| |
| func NewFloat16Builder(mem memory.Allocator) *Float16Builder { |
| return &Float16Builder{builder: builder{refCount: 1, mem: mem}} |
| } |
| |
| // Release decreases the reference count by 1. |
| // When the reference count goes to zero, the memory is freed. |
| func (b *Float16Builder) Release() { |
| debug.Assert(atomic.LoadInt64(&b.refCount) > 0, "too many releases") |
| |
| if atomic.AddInt64(&b.refCount, -1) == 0 { |
| if b.nullBitmap != nil { |
| b.nullBitmap.Release() |
| b.nullBitmap = nil |
| } |
| if b.data != nil { |
| b.data.Release() |
| b.data = nil |
| b.rawData = nil |
| } |
| } |
| } |
| |
| func (b *Float16Builder) Append(v float16.Num) { |
| b.Reserve(1) |
| b.UnsafeAppend(v) |
| } |
| |
| func (b *Float16Builder) UnsafeAppend(v float16.Num) { |
| bitutil.SetBit(b.nullBitmap.Bytes(), b.length) |
| b.rawData[b.length] = v |
| b.length++ |
| } |
| |
| func (b *Float16Builder) AppendNull() { |
| b.Reserve(1) |
| b.UnsafeAppendBoolToBitmap(false) |
| } |
| |
| func (b *Float16Builder) UnsafeAppendBoolToBitmap(isValid bool) { |
| if isValid { |
| bitutil.SetBit(b.nullBitmap.Bytes(), b.length) |
| } else { |
| b.nulls++ |
| } |
| b.length++ |
| } |
| |
| // AppendValues will append the values in the v slice. The valid slice determines which values |
| // in v are valid (not null). The valid slice must either be empty or be equal in length to v. If empty, |
| // all values in v are appended and considered valid. |
| func (b *Float16Builder) AppendValues(v []float16.Num, valid []bool) { |
| if len(v) != len(valid) && len(valid) != 0 { |
| panic("len(v) != len(valid) && len(valid) != 0") |
| } |
| |
| if len(v) == 0 { |
| return |
| } |
| |
| b.Reserve(len(v)) |
| if len(v) > 0 { |
| arrow.Float16Traits.Copy(b.rawData[b.length:], v) |
| } |
| b.builder.unsafeAppendBoolsToBitmap(valid, len(v)) |
| } |
| |
| func (b *Float16Builder) init(capacity int) { |
| b.builder.init(capacity) |
| |
| b.data = memory.NewResizableBuffer(b.mem) |
| bytesN := arrow.Uint16Traits.BytesRequired(capacity) |
| b.data.Resize(bytesN) |
| b.rawData = arrow.Float16Traits.CastFromBytes(b.data.Bytes()) |
| } |
| |
| // Reserve ensures there is enough space for appending n elements |
| // by checking the capacity and calling Resize if necessary. |
| func (b *Float16Builder) Reserve(n int) { |
| b.builder.reserve(n, b.Resize) |
| } |
| |
| // Resize adjusts the space allocated by b to n elements. If n is greater than b.Cap(), |
| // additional memory will be allocated. If n is smaller, the allocated memory may reduced. |
| func (b *Float16Builder) Resize(n int) { |
| nBuilder := n |
| if n < minBuilderCapacity { |
| n = minBuilderCapacity |
| } |
| |
| if b.capacity == 0 { |
| b.init(n) |
| } else { |
| b.builder.resize(nBuilder, b.init) |
| b.data.Resize(arrow.Float16Traits.BytesRequired(n)) |
| b.rawData = arrow.Float16Traits.CastFromBytes(b.data.Bytes()) |
| } |
| } |
| |
| // NewArray creates a Float16 array from the memory buffers used by the builder and resets the Float16Builder |
| // so it can be used to build a new array. |
| func (b *Float16Builder) NewArray() Interface { |
| return b.NewFloat16Array() |
| } |
| |
| // NewFloat16Array creates a Float16 array from the memory buffers used by the builder and resets the Float16Builder |
| // so it can be used to build a new array. |
| func (b *Float16Builder) NewFloat16Array() (a *Float16) { |
| data := b.newData() |
| a = NewFloat16Data(data) |
| data.Release() |
| return |
| } |
| |
| func (b *Float16Builder) newData() (data *Data) { |
| bytesRequired := arrow.Float16Traits.BytesRequired(b.length) |
| if bytesRequired > 0 && bytesRequired < b.data.Len() { |
| // trim buffers |
| b.data.Resize(bytesRequired) |
| } |
| data = NewData(arrow.FixedWidthTypes.Float16, b.length, []*memory.Buffer{b.nullBitmap, b.data}, nil, b.nulls, 0) |
| b.reset() |
| |
| if b.data != nil { |
| b.data.Release() |
| b.data = nil |
| b.rawData = nil |
| } |
| |
| return |
| } |