add mapper package

internal/mapper/mapper.go

@@ -0,0 +1,44 @@
+// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
+
+package mapper
+
+type Store[Key comparable, Value any] map[Key]Value
+
+func (m Store[Key, Value]) Get(key Key) (Value, bool) {
+	v, ok := m[key]
+	return v, ok
+}
+
+func (m Store[Key, Value]) Has(key Key) (ok bool) {
+	_, ok = m[key]
+	return
+}
+
+func (m Store[Key, Value]) Set(key Key, value Value) {
+	m[key] = value
+}
+
+type Mapper interface {
+	Get(key string) (any, bool)
+	Has(key string) (bool)
+	Set(key string, value any)
+}
+
+type Getter[Key comparable, Value comparable] interface {
+	Get(key Key) (Value, bool)
+	Has(key Key) (bool)
+}
+
+type Map[Key comparable, Value comparable] interface {
+	Get(key Key) (Value, bool)
+	Has(key Key) (bool)
+	Set(key Key, value Value)
+}
+
+func New[Key comparable, Value comparable]() Store[Key, Value] {
+	return make(Store[Key, Value])
+}
+
+func NewString[Value comparable]() Store[string, Value] {
+	return make(Store[string, Value])
+}

internal/mapper/mapper_test.go

@@ -0,0 +1,53 @@
+// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
+
+package mapper
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestNewMapper(t *testing.T) {
+	testMapper := New[string, int]()
+	assert.NotNil(t, testMapper)
+}
+
+func TestMapperGet(t *testing.T) {
+	testMapper := New[string, int]()
+	assert.NotNil(t, testMapper)
+
+	testMapper["foo"] = 3
+	v, exists := testMapper.Get("foo")
+	assert.True(t, exists)
+	assert.Equal(t, 3, v)
+}
+
+func TestMapperInterface(t *testing.T) {
+	var testInterface Map[string, int]
+	testMapper := New[string, int]()
+	assert.NotNil(t, testMapper)
+
+	testMapper["foo"] = 3
+	testInterface = testMapper
+	v, exists := testInterface.Get("foo")
+	assert.True(t, exists)
+	assert.Equal(t, 3, v)
+}
+
+func TestMapperMissing(t *testing.T) {
+	testMapper := New[string, int]()
+	assert.NotNil(t, testMapper)
+
+	testMapper["foo"] = 3
+	_, exists := testMapper.Get("bar")
+	assert.False(t, exists)
+}
+
+func TestNewStringMapper(t *testing.T) {
+	testMapper := NewString[int]()
+	assert.NotNil(t, testMapper)
+	testMapper["bar"] = 10
+	v, exists := testMapper.Get("bar")
+	assert.True(t, exists)
+	assert.Equal(t, 10, v)
+}