Add SearchAttributeKey value objects

src/DataConverter/SearchAttributes/BoolValue.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+/**
+ * @template-extends SearchAttributeKey<bool>
+ * @psalm-immutable
+ */
+final class BoolValue extends SearchAttributeKey
+{
+    protected function getType(): string
+    {
+        return ValueType::Bool->value;
+    }
+}

src/DataConverter/SearchAttributes/DatetimeValue.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+use DateTimeImmutable;
+
+/**
+ * @template-extends SearchAttributeKey<DateTimeImmutable>
+ * @psalm-immutable
+ */
+final class DatetimeValue extends SearchAttributeKey
+{
+    public function getValue(): string
+    {
+        return $this->value->format(\DateTimeImmutable::RFC3339);
+    }
+
+    protected function getType(): string
+    {
+        return ValueType::Datetime->value;
+    }
+}

src/DataConverter/SearchAttributes/FloatValue.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+/**
+ * @template-extends SearchAttributeKey<float>
+ * @psalm-immutable
+ */
+final class FloatValue extends SearchAttributeKey
+{
+    protected function getType(): string
+    {
+        return ValueType::Float->value;
+    }
+}

src/DataConverter/SearchAttributes/IntValue.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+/**
+ * @template-extends SearchAttributeKey<int>
+ * @psalm-immutable
+ */
+final class IntValue extends SearchAttributeKey
+{
+    protected function getType(): string
+    {
+        return ValueType::Int->value;
+    }
+}

src/DataConverter/SearchAttributes/KeywordListValue.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+/**
+ * @template-extends SearchAttributeKey<list<string>>
+ * @psalm-immutable
+ */
+final class KeywordListValue extends SearchAttributeKey
+{
+    protected function getType(): string
+    {
+        return ValueType::KeywordList->value;
+    }
+}

src/DataConverter/SearchAttributes/KeywordValue.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+/**
+ * @template-extends SearchAttributeKey<string>
+ * @psalm-immutable
+ */
+final class KeywordValue extends SearchAttributeKey
+{
+    protected function getType(): string
+    {
+        return ValueType::Keyword->value;
+    }
+}

src/DataConverter/SearchAttributes/SearchAttributeKey.php

@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+/**
+ * @template-covariant TValue
+ * @psalm-immutable
+ */
+abstract class SearchAttributeKey implements \JsonSerializable
+{
+    /**
+     * @param non-empty-string $key
+     * @param TValue $value
+     */
+    final protected function __construct(
+        public readonly string $key,
+        public readonly mixed $value,
+    ) {}
+
+    /**
+     * @param non-empty-string $key
+     */
+    public static function bool(string $key, bool $value): BoolValue
+    {
+        return new BoolValue($key, $value);
+    }
+
+    /**
+     * @param non-empty-string $key
+     */
+    public static function integer(string $key, int $value): IntValue
+    {
+        return new IntValue($key, $value);
+    }
+
+    /**
+     * @param non-empty-string $key
+     */
+    public static function float(string $key, float $value): FloatValue
+    {
+        return new FloatValue($key, $value);
+    }
+
+    /**
+     * @param non-empty-string $key
+     */
+    public static function keyword(string $key, string $value): KeywordValue
+    {
+        return new KeywordValue($key, $value);
+    }
+
+    /**
+     * @param non-empty-string $key
+     */
+    public static function string(string $key, string $value): StringValue
+    {
+        return new StringValue($key, $value);
+    }
+
+    public static function datetime(string $key, \DateTimeInterface|string $value): DatetimeValue
+    {
+        return new DatetimeValue($key, match (true) {
+            \is_string($value) => new \DateTimeImmutable($value),
+            $value instanceof \DateTimeImmutable => $value,
+            default => \DateTimeImmutable::createFromInterface($value),
+        });
+    }
+
+    /**
+     * @param non-empty-string $key
+     * @param iterable<scalar> $value
+     */
+    public static function keywordList(string $key, iterable $value): KeywordListValue
+    {
+        /** @var list<string> $values */
+        $values = [];
+        foreach ($value as $item) {
+            $values[] = (string) $item;
+        }
+
+        return new KeywordListValue($key, $values);
+    }
+
+    public function jsonSerialize(): array
+    {
+        return [
+            'type' => $this->getType(),
+            'value' => $this->getValue(),
+        ];
+    }
+
+    abstract protected function getType(): string;
+
+    protected function getValue(): mixed
+    {
+        return $this->value;
+    }
+}

src/DataConverter/SearchAttributes/StringValue.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+/**
+ * @template-extends SearchAttributeKey<string>
+ * @psalm-immutable
+ */
+final class StringValue extends SearchAttributeKey
+{
+    protected function getType(): string
+    {
+        return ValueType::String->value;
+    }
+}

src/DataConverter/SearchAttributes/ValueType.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Temporal\DataConverter\SearchAttributes;
+
+enum ValueType: string
+{
+    case Bool = 'bool';
+    case Float = 'float64';
+    case Int = 'int';
+    case Keyword = 'keyword';
+    case KeywordList = 'keyword_list';
+    case String = 'string';
+    case Datetime = 'datetime';
+}