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multipolygon.go
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multipolygon.go
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// Copyright 2020-2022 Dolthub, 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 spatial
import (
"fmt"
"strings"
"github.com/gabereiser/go-mysql-server/sql/expression"
"github.com/gabereiser/go-mysql-server/sql/types"
"github.com/gabereiser/go-mysql-server/sql"
)
// MultiPolygon is a function that returns a MultiPolygon.
type MultiPolygon struct {
expression.NaryExpression
}
var _ sql.FunctionExpression = (*MultiPolygon)(nil)
// NewMultiPolygon creates a new multipolygon expression.
func NewMultiPolygon(args ...sql.Expression) (sql.Expression, error) {
if len(args) < 1 {
return nil, sql.ErrInvalidArgumentNumber.New("MultiPolygon", "1 or more", len(args))
}
return &MultiPolygon{expression.NaryExpression{ChildExpressions: args}}, nil
}
// FunctionName implements sql.FunctionExpression
func (p *MultiPolygon) FunctionName() string {
return "multipolygon"
}
// Description implements sql.FunctionExpression
func (p *MultiPolygon) Description() string {
return "returns a new multipolygon."
}
// Type implements the sql.Expression interface.
func (p *MultiPolygon) Type() sql.Type {
return types.MultiPolygonType{}
}
func (p *MultiPolygon) String() string {
var args = make([]string, len(p.ChildExpressions))
for i, arg := range p.ChildExpressions {
args[i] = arg.String()
}
return fmt.Sprintf("%s(%s)", p.FunctionName(), strings.Join(args, ","))
}
// WithChildren implements the Expression interface.
func (p *MultiPolygon) WithChildren(children ...sql.Expression) (sql.Expression, error) {
return NewMultiPolygon(children...)
}
// Eval implements the sql.Expression interface.
func (p *MultiPolygon) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
var polys = make([]types.Polygon, len(p.ChildExpressions))
for i, arg := range p.ChildExpressions {
val, err := arg.Eval(ctx, row)
if err != nil {
return nil, err
}
switch v := val.(type) {
case types.Polygon:
polys[i] = v
case types.GeometryValue:
return nil, sql.ErrInvalidArgumentDetails.New(p.FunctionName(), v)
default:
return nil, sql.ErrIllegalGISValue.New(v)
}
}
return types.MultiPolygon{Polygons: polys}, nil
}