package bytebufferpool

// ByteBuffer provides byte buffer, which can be used for minimizing
// memory allocations.
//
// ByteBuffer may be used with functions appending data to the given []byte
// slice. See example code for details.
//
// Use Get for obtaining an empty byte buffer.
type ByteBuffer struct {

	// B is a byte buffer to use in append-like workloads.
	// See example code for details.
	B []byte
}

// Bytes returns b.B, i.e. all the bytes accumulated in the buffer.
//
// The purpose of this function is bytes.Buffer compatibility.
func (b *ByteBuffer) Bytes() []byte {
	return b.B
}

// Write implements io.Writer - it appends p to ByteBuffer.B
func (b *ByteBuffer) Write(p []byte) (int, error) {
	b.B = append(b.B, p...)
	return len(p), nil
}

// WriteByte appends the byte c to the buffer.
//
// The purpose of this function is bytes.Buffer compatibility.
//
// The function always returns nil.
func (b *ByteBuffer) WriteByte(c byte) error {
	b.B = append(b.B, c)
	return nil
}

// WriteString appends s to ByteBuffer.B
func (b *ByteBuffer) WriteString(s string) (int, error) {
	b.B = append(b.B, s...)
	return len(s), nil
}

// Set sets ByteBuffer.B to p
func (b *ByteBuffer) Set(p []byte) {
	b.B = append(b.B[:0], p...)
}

// SetString sets ByteBuffer.B to s
func (b *ByteBuffer) SetString(s string) {
	b.B = append(b.B[:0], s...)
}

// Reset makes ByteBuffer.B empty.
func (b *ByteBuffer) Reset() {
	b.B = b.B[:0]
}

// Get returns an empty byte buffer from the pool.
//
// Getd byte buffer may be returned to the pool via Put call.
// This reduces the number of memory allocations required for byte buffer
// management.
func Get() *ByteBuffer {
	return defaultPool.Get()
}

// Put returns byte buffer to the pool.
//
// ByteBuffer.B mustn't be touched after returning it to the pool.
// Otherwise data races will occur.
func Put(b *ByteBuffer) {
	defaultPool.Put(b)
}

var defaultPool Pool