Running glide update -v to pulldown all the required depedencies

vendor/cloud.google.com/go/bigquery/value.go

@@ -0,0 +1,195 @@
+// Copyright 2015 Google Inc. All Rights Reserved.
+//
+// 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 bigquery
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"time"
+
+	bq "google.golang.org/api/bigquery/v2"
+)
+
+// Value stores the contents of a single cell from a BigQuery result.
+type Value interface{}
+
+// ValueLoader stores a slice of Values representing a result row from a Read operation.
+// See Iterator.Get for more information.
+type ValueLoader interface {
+	Load(v []Value) error
+}
+
+// ValueList converts a []Value to implement ValueLoader.
+type ValueList []Value
+
+// Load stores a sequence of values in a ValueList.
+func (vs *ValueList) Load(v []Value) error {
+	*vs = append(*vs, v...)
+	return nil
+}
+
+// A ValueSaver returns a row of data to be inserted into a table.
+type ValueSaver interface {
+	// Save returns a row to be inserted into a BigQuery table, represented
+	// as a map from field name to Value.
+	// If insertID is non-empty, BigQuery will use it to de-duplicate
+	// insertions of this row on a best-effort basis.
+	Save() (row map[string]Value, insertID string, err error)
+}
+
+// ValuesSaver implements ValueSaver for a slice of Values.
+type ValuesSaver struct {
+	Schema Schema
+
+	// If non-empty, BigQuery will use InsertID to de-duplicate insertions
+	// of this row on a best-effort basis.
+	InsertID string
+
+	Row []Value
+}
+
+// Save implements ValueSaver
+func (vls *ValuesSaver) Save() (map[string]Value, string, error) {
+	m, err := valuesToMap(vls.Row, vls.Schema)
+	return m, vls.InsertID, err
+}
+
+func valuesToMap(vs []Value, schema Schema) (map[string]Value, error) {
+	if len(vs) != len(schema) {
+		return nil, errors.New("Schema does not match length of row to be inserted")
+	}
+
+	m := make(map[string]Value)
+	for i, fieldSchema := range schema {
+		if fieldSchema.Type == RecordFieldType {
+			nested, ok := vs[i].([]Value)
+			if !ok {
+				return nil, errors.New("Nested record is not a []Value")
+			}
+			value, err := valuesToMap(nested, fieldSchema.Schema)
+			if err != nil {
+				return nil, err
+			}
+			m[fieldSchema.Name] = value
+		} else {
+			m[fieldSchema.Name] = vs[i]
+		}
+	}
+	return m, nil
+}
+
+// convertRows converts a series of TableRows into a series of Value slices.
+// schema is used to interpret the data from rows; its length must match the
+// length of each row.
+func convertRows(rows []*bq.TableRow, schema Schema) ([][]Value, error) {
+	var rs [][]Value
+	for _, r := range rows {
+		row, err := convertRow(r, schema)
+		if err != nil {
+			return nil, err
+		}
+		rs = append(rs, row)
+	}
+	return rs, nil
+}
+
+func convertRow(r *bq.TableRow, schema Schema) ([]Value, error) {
+	if len(schema) != len(r.F) {
+		return nil, errors.New("schema length does not match row length")
+	}
+	var values []Value
+	for i, cell := range r.F {
+		fs := schema[i]
+		v, err := convertValue(cell.V, fs.Type, fs.Schema)
+		if err != nil {
+			return nil, err
+		}
+		values = append(values, v)
+	}
+	return values, nil
+}
+
+func convertValue(val interface{}, typ FieldType, schema Schema) (Value, error) {
+	switch val := val.(type) {
+	case nil:
+		return nil, nil
+	case []interface{}:
+		return convertRepeatedRecord(val, typ, schema)
+	case map[string]interface{}:
+		return convertNestedRecord(val, schema)
+	case string:
+		return convertBasicType(val, typ)
+	default:
+		return nil, fmt.Errorf("got value %v; expected a value of type %s", val, typ)
+	}
+}
+
+func convertRepeatedRecord(vals []interface{}, typ FieldType, schema Schema) (Value, error) {
+	var values []Value
+	for _, cell := range vals {
+		// each cell contains a single entry, keyed by "v"
+		val := cell.(map[string]interface{})["v"]
+		v, err := convertValue(val, typ, schema)
+		if err != nil {
+			return nil, err
+		}
+		values = append(values, v)
+	}
+	return values, nil
+}
+
+func convertNestedRecord(val map[string]interface{}, schema Schema) (Value, error) {
+	// convertNestedRecord is similar to convertRow, as a record has the same structure as a row.
+
+	// Nested records are wrapped in a map with a single key, "f".
+	record := val["f"].([]interface{})
+	if len(record) != len(schema) {
+		return nil, errors.New("schema length does not match record length")
+	}
+
+	var values []Value
+	for i, cell := range record {
+		// each cell contains a single entry, keyed by "v"
+		val := cell.(map[string]interface{})["v"]
+
+		fs := schema[i]
+		v, err := convertValue(val, fs.Type, fs.Schema)
+		if err != nil {
+			return nil, err
+		}
+		values = append(values, v)
+	}
+	return values, nil
+}
+
+// convertBasicType returns val as an interface with a concrete type specified by typ.
+func convertBasicType(val string, typ FieldType) (Value, error) {
+	switch typ {
+	case StringFieldType:
+		return val, nil
+	case IntegerFieldType:
+		return strconv.Atoi(val)
+	case FloatFieldType:
+		return strconv.ParseFloat(val, 64)
+	case BooleanFieldType:
+		return strconv.ParseBool(val)
+	case TimestampFieldType:
+		f, err := strconv.ParseFloat(val, 64)
+		return Value(time.Unix(0, int64(f*1e9))), err
+	default:
+		return nil, errors.New("unrecognized type")
+	}
+}