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filter.go
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filter.go
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// Copyright 2013-2015 Aerospike, Inc.
//
// Licensed 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 aerospike
import (
ParticleType "github.com/aerospike/aerospike-client-go/types/particle_type"
Buffer "github.com/aerospike/aerospike-client-go/utils/buffer"
)
// Filter specifies a query filter definition.
type Filter struct {
name string
idxType IndexCollectionType
valueParticleType int
begin Value
end Value
}
// NewEqualFilter creates a new equality filter instance for query.
func NewEqualFilter(binName string, value interface{}) *Filter {
val := NewValue(value)
return newFilter(binName, ICT_DEFAULT, val.GetType(), val, val)
}
// NewRangeFilter creates a range filter for query.
// Range arguments must be int64 values.
// String ranges are not supported.
func NewRangeFilter(binName string, begin int64, end int64) *Filter {
vBegin, vEnd := NewValue(begin), NewValue(end)
return newFilter(binName, ICT_DEFAULT, vBegin.GetType(), vBegin, vEnd)
}
// NewContainsFilter creates a contains filter for query on collection index.
func NewContainsFilter(name string, indexCollectionType IndexCollectionType, value interface{}) *Filter {
v := NewValue(value)
return newFilter(name, indexCollectionType, v.GetType(), v, v)
}
// NewContainsRangeFilter creates a contains filter for query on ranges of data in a collection index.
func NewContainsRangeFilter(name string, indexCollectionType IndexCollectionType, begin, end int64) *Filter {
vBegin, vEnd := NewValue(begin), NewValue(end)
return newFilter(name, indexCollectionType, vBegin.GetType(), vBegin, vEnd)
}
// NewGeoWithinRegionFilter creates a geospatial "within region" filter for query.
// Argument must be a valid GeoJSON region.
func NewGeoPointsWithinRegionFilter(name, region string) *Filter {
v := NewStringValue(region)
return newFilter(name, ICT_DEFAULT, ParticleType.GEOJSON, v, v)
}
// GeoContainingPointFilter creates a geospatial "containing point" filter for query.
// Argument must be a valid GeoJSON point.
func NewGeoRegionContainingPointFilter(name, point string) *Filter {
v := NewStringValue(point)
return newFilter(name, ICT_DEFAULT, ParticleType.GEOJSON, v, v)
}
// Create a filter for query.
// Range arguments must be longs or integers which can be cast to longs.
// String ranges are not supported.
func newFilter(name string, indexCollectionType IndexCollectionType, valueParticleType int, begin Value, end Value) *Filter {
return &Filter{
name: name,
idxType: indexCollectionType,
valueParticleType: valueParticleType,
begin: begin,
end: end,
}
}
// IndexType return filter's index type.
func (fltr *Filter) IndexCollectionType() IndexCollectionType {
return fltr.idxType
}
func (fltr *Filter) estimateSize() (int, error) {
// bin name size(1) + particle type size(1) + begin particle size(4) + end particle size(4) = 10
return len(fltr.name) + fltr.begin.estimateSize() + fltr.end.estimateSize() + 10, nil
}
func (fltr *Filter) write(buf []byte, offset int) (int, error) {
var err error
// Write name.
len := copy(buf[offset+1:], fltr.name)
buf[offset] = byte(len)
offset += len + 1
// Write particle type.
buf[offset] = byte(fltr.valueParticleType)
offset++
// Write filter begin.
len, err = fltr.begin.write(buf, offset+4)
if err != nil {
return -1, err
}
Buffer.Int32ToBytes(int32(len), buf, offset)
offset += len + 4
// Write filter end.
len, err = fltr.end.write(buf, offset+4)
if err != nil {
return -1, err
}
Buffer.Int32ToBytes(int32(len), buf, offset)
offset += len + 4
return offset, nil
}