string.go

// 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 coderx

import (
	"github.com/apache/beam/sdks/v2/go/pkg/beam/core/graph/coder"
	"github.com/apache/beam/sdks/v2/go/pkg/beam/core/typex"
	"github.com/apache/beam/sdks/v2/go/pkg/beam/core/util/reflectx"
)

// NewString returns a coder for the string type. It uses the native
// []byte to string conversion.
//
// Only for custom coder test use.
func NewString() (*coder.CustomCoder, error) {
	return coder.NewCustomCoder("string", reflectx.String, encString, decString)
}

func encString(v typex.T) []byte {
	return []byte(v.(string))
}

func decString(data []byte) typex.T {
	return string(data)
}