/
binary.go
134 lines (116 loc) · 3.33 KB
/
binary.go
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// 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 (
"bytes"
"fmt"
"strings"
"unsafe"
"github.com/aliyun/aliyun-odps-go-sdk/arrow"
)
// A type which represents an immutable sequence of variable-length binary strings.
type Binary struct {
array
valueOffsets []int32
valueBytes []byte
}
// NewBinaryData constructs a new Binary array from data.
func NewBinaryData(data *Data) *Binary {
a := &Binary{}
a.refCount = 1
a.setData(data)
return a
}
// Value returns the slice at index i. This value should not be mutated.
func (a *Binary) Value(i int) []byte {
if i < 0 || i >= a.array.data.length {
panic("arrow/array: index out of range")
}
idx := a.array.data.offset + i
return a.valueBytes[a.valueOffsets[idx]:a.valueOffsets[idx+1]]
}
// ValueString returns the string at index i without performing additional allocations.
// The string is only valid for the lifetime of the Binary array.
func (a *Binary) ValueString(i int) string {
b := a.Value(i)
return *(*string)(unsafe.Pointer(&b))
}
func (a *Binary) ValueOffset(i int) int {
if i < 0 || i >= a.array.data.length {
panic("arrow/array: index out of range")
}
return int(a.valueOffsets[a.array.data.offset+i])
}
func (a *Binary) ValueLen(i int) int {
if i < 0 || i >= a.array.data.length {
panic("arrow/array: index out of range")
}
beg := a.array.data.offset + i
return int(a.valueOffsets[beg+1] - a.valueOffsets[beg])
}
func (a *Binary) ValueOffsets() []int32 {
beg := a.array.data.offset
end := beg + a.array.data.length + 1
return a.valueOffsets[beg:end]
}
func (a *Binary) ValueBytes() []byte {
beg := a.array.data.offset
end := beg + a.array.data.length
return a.valueBytes[a.valueOffsets[beg]:a.valueOffsets[end]]
}
func (a *Binary) String() string {
o := new(strings.Builder)
o.WriteString("[")
for i := 0; i < a.Len(); i++ {
if i > 0 {
o.WriteString(" ")
}
switch {
case a.IsNull(i):
o.WriteString("(null)")
default:
fmt.Fprintf(o, "%q", a.ValueString(i))
}
}
o.WriteString("]")
return o.String()
}
func (a *Binary) setData(data *Data) {
if len(data.buffers) != 3 {
panic("len(data.buffers) != 3")
}
a.array.setData(data)
if valueData := data.buffers[2]; valueData != nil {
a.valueBytes = valueData.Bytes()
}
if valueOffsets := data.buffers[1]; valueOffsets != nil {
a.valueOffsets = arrow.Int32Traits.CastFromBytes(valueOffsets.Bytes())
}
}
func arrayEqualBinary(left, right *Binary) bool {
for i := 0; i < left.Len(); i++ {
if left.IsNull(i) {
continue
}
if !bytes.Equal(left.Value(i), right.Value(i)) {
return false
}
}
return true
}
var (
_ Interface = (*Binary)(nil)
)