github.com/willyham/dosa@v2.3.1-0.20171024181418-1e446d37ee71+incompatible/conditioner.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package dosa
    22  
    23  import "github.com/pkg/errors"
    24  
    25  type conditioner struct {
    26  	object     DomainObject
    27  	conditions map[string][]*Condition
    28  }
    29  
    30  func (c *conditioner) appendOp(op Operator, fieldName string, value interface{}) {
    31  	c.conditions[fieldName] = append(c.conditions[fieldName], &Condition{Op: op, Value: value})
    32  }
    33  
    34  // convertConditions converts a list of client field names to server side field names
    35  func convertConditions(conditions map[string][]*Condition, t *Table) (map[string][]*Condition, error) {
    36  	serverConditions := map[string][]*Condition{}
    37  	for colName, conds := range conditions {
    38  		if scolName, ok := t.FieldToCol[colName]; ok {
    39  			serverConditions[scolName] = conds
    40  			// we need to be sure each of the types are correct for marshaling
    41  			cd := t.FindColumnDefinition(scolName)
    42  			for _, cond := range conds {
    43  				if err := ensureTypeMatch(cd.Type, cond.Value); err != nil {
    44  					return nil, errors.Wrapf(err, "column %s", colName)
    45  				}
    46  			}
    47  		} else {
    48  			return nil, errors.Errorf("Cannot find column %q in struct %q", colName, t.StructName)
    49  		}
    50  	}
    51  	return serverConditions, nil
    52  }