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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 arrow
// OffsetTraits is a convenient interface over the various type traits
// constants such as arrow.Int32Traits allowing types with offsets, like
// BinaryType, StringType, LargeBinaryType and LargeStringType to have
// a method to return information about their offset type and how many bytes
// would be required to allocate an offset buffer for them.
type OffsetTraits interface {
// BytesRequired returns the number of bytes required to be allocated
// in order to hold the passed in number of elements of this type.
BytesRequired(int) int
}
type BinaryType struct{}
func (t *BinaryType) ID() Type { return BINARY }
func (t *BinaryType) Name() string { return "binary" }
func (t *BinaryType) String() string { return "binary" }
func (t *BinaryType) binary() {}
func (t *BinaryType) Fingerprint() string { return typeFingerprint(t) }
func (t *BinaryType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(),
SpecFixedWidth(Int32SizeBytes), SpecVariableWidth()}}
}
func (t *BinaryType) OffsetTypeTraits() OffsetTraits { return Int32Traits }
func (BinaryType) IsUtf8() bool { return false }
type StringType struct{}
func (t *StringType) ID() Type { return STRING }
func (t *StringType) Name() string { return "utf8" }
func (t *StringType) String() string { return "utf8" }
func (t *StringType) binary() {}
func (t *StringType) Fingerprint() string { return typeFingerprint(t) }
func (t *StringType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(),
SpecFixedWidth(Int32SizeBytes), SpecVariableWidth()}}
}
func (t *StringType) OffsetTypeTraits() OffsetTraits { return Int32Traits }
func (StringType) IsUtf8() bool { return true }
type LargeBinaryType struct{}
func (t *LargeBinaryType) ID() Type { return LARGE_BINARY }
func (t *LargeBinaryType) Name() string { return "large_binary" }
func (t *LargeBinaryType) String() string { return "large_binary" }
func (t *LargeBinaryType) binary() {}
func (t *LargeBinaryType) Fingerprint() string { return typeFingerprint(t) }
func (t *LargeBinaryType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(),
SpecFixedWidth(Int64SizeBytes), SpecVariableWidth()}}
}
func (t *LargeBinaryType) OffsetTypeTraits() OffsetTraits { return Int64Traits }
func (LargeBinaryType) IsUtf8() bool { return false }
type LargeStringType struct{}
func (t *LargeStringType) ID() Type { return LARGE_STRING }
func (t *LargeStringType) Name() string { return "large_utf8" }
func (t *LargeStringType) String() string { return "large_utf8" }
func (t *LargeStringType) binary() {}
func (t *LargeStringType) Fingerprint() string { return typeFingerprint(t) }
func (t *LargeStringType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(),
SpecFixedWidth(Int64SizeBytes), SpecVariableWidth()}}
}
func (t *LargeStringType) OffsetTypeTraits() OffsetTraits { return Int64Traits }
func (LargeStringType) IsUtf8() bool { return true }
type BinaryViewType struct{}
func (*BinaryViewType) ID() Type { return BINARY_VIEW }
func (*BinaryViewType) Name() string { return "binary_view" }
func (*BinaryViewType) String() string { return "binary_view" }
func (*BinaryViewType) IsUtf8() bool { return false }
func (*BinaryViewType) binary() {}
func (*BinaryViewType) view() {}
func (t *BinaryViewType) Fingerprint() string { return typeFingerprint(t) }
func (*BinaryViewType) Layout() DataTypeLayout {
variadic := SpecVariableWidth()
return DataTypeLayout{
Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(ViewHeaderSizeBytes)},
VariadicSpec: &variadic,
}
}
type StringViewType struct{}
func (*StringViewType) ID() Type { return STRING_VIEW }
func (*StringViewType) Name() string { return "string_view" }
func (*StringViewType) String() string { return "string_view" }
func (*StringViewType) IsUtf8() bool { return true }
func (*StringViewType) binary() {}
func (*StringViewType) view() {}
func (t *StringViewType) Fingerprint() string { return typeFingerprint(t) }
func (*StringViewType) Layout() DataTypeLayout {
variadic := SpecVariableWidth()
return DataTypeLayout{
Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(ViewHeaderSizeBytes)},
VariadicSpec: &variadic,
}
}
var (
BinaryTypes = struct {
Binary BinaryDataType
String BinaryDataType
LargeBinary BinaryDataType
LargeString BinaryDataType
BinaryView BinaryDataType
StringView BinaryDataType
}{
Binary: &BinaryType{},
String: &StringType{},
LargeBinary: &LargeBinaryType{},
LargeString: &LargeStringType{},
BinaryView: &BinaryViewType{},
StringView: &StringViewType{},
}
_ BinaryViewDataType = (*StringViewType)(nil)
_ BinaryViewDataType = (*BinaryViewType)(nil)
)
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