get table for mapped class

src/Field/BooleanField.php

@@ -4,7 +4,7 @@
 
 class BooleanField extends Field
 {
-    public function getDynamoDbType(): string
+    public function dynamoDbType(): string
     {
         return 'BOOL';
     }

src/Field/DateTimeField.php

@@ -4,7 +4,7 @@
 
 class DateTimeField extends Field
 {
-    public function getDynamoDbType(): string
+    public function dynamoDbType(): string
     {
         // Dates are stored as strings
         return 'S';

src/Field/Field.php

@@ -22,7 +22,7 @@ public function name(): string
      */
     public function readFieldValue(array $item, string $fieldName)
     {
-        $rawDynamoDbValue = $item[$fieldName][$this->getDynamoDbType()];
+        $rawDynamoDbValue = $item[$fieldName][$this->dynamoDbType()];
 
         return $this->castValueFromDynamoDbFormat($rawDynamoDbValue);
     }
@@ -33,11 +33,11 @@ public function readFieldValue(array $item, string $fieldName)
     public function dynamoDbQueryValue($fieldValue): array
     {
         return [
-            $this->getDynamoDbType() => $this->castValueForDynamoDbFormat($fieldValue),
+            $this->dynamoDbType() => $this->castValueForDynamoDbFormat($fieldValue),
         ];
     }
 
-    abstract protected function getDynamoDbType(): string;
+    abstract protected function dynamoDbType(): string;
 
     /**
      * @param mixed $value

src/Field/FloatField.php

@@ -4,7 +4,7 @@
 
 class FloatField extends Field
 {
-    public function getDynamoDbType(): string
+    public function dynamoDbType(): string
     {
         return 'N';
     }

src/Field/IntegerField.php

@@ -4,7 +4,7 @@
 
 class IntegerField extends Field
 {
-    public function getDynamoDbType(): string
+    public function dynamoDbType(): string
     {
         return 'N';
     }

src/Field/StringField.php

@@ -4,7 +4,7 @@
 
 class StringField extends Field
 {
-    public function getDynamoDbType(): string
+    public function dynamoDbType(): string
     {
         return 'S';
     }

src/Mapping/ClassMapping.php

@@ -2,8 +2,11 @@
 
 namespace Dynamap\Mapping;
 
+use Dynamap\Mapping\Field\DynamoDBField;
 use Dynamap\Mapping\Exception\CannotMapNonExistentFieldException;
 use Dynamap\Mapping\Exception\ClassNameInvalidException;
+use Dynamap\Mapping\Exception\MappingNotFoundException;
+use Dynamap\Mapping\Exception\NoFieldsMappedForClassException;
 
 class ClassMapping
 {
@@ -33,8 +36,28 @@ public static function fromArray(string $className, array $config): ClassMapping
         return new static($className, $config);
     }
 
+    public function getClassName(): string
+    {
+        return $this->className;
+    }
+
+    public function getMappedProperty(string $propertyName): DynamoDBField
+    {
+        if (true === empty($this->mapping['fields'])) { // todo: add a test for this
+            throw new NoFieldsMappedForClassException('You have tried to access mapping for a class which has no mapped properties');
+        }
+
+        if (false === \array_key_exists($propertyName, $this->mapping['fields'])) {
+            throw new MappingNotFoundException('Mapping for ' . $propertyName . ' could not be found');
+        }
+
+        return $this->mapping['fields'][$propertyName];
+    }
+
     /**
+     * @param string $className
      * @param array $fields
+     * @return array
      * @throws CannotMapNonExistentFieldException
      * @throws \ReflectionException
      */
@@ -48,16 +71,16 @@ private static function mapProperties(string $className, array $fields): array
         }, []);
 
         $mappedFields = [];
+        $factory = new FieldMappingFactory();
+
         foreach ($fields as $classField => $type) {
-            if (\in_array($classField, $classProperties) === false) {
+            if (false === \in_array($classField, $classProperties, false)) {
                 throw new CannotMapNonExistentFieldException('The field ' . $classField . ' does not exist in ' . $className);
             }
 
-            $mappedFields[$classField] = $factory->getType($type);
+            $mappedFields[$classField] = $factory->getDynamoDbType($type);
         }
 
-
-
-        return $fields;
+        return $mappedFields;
     }
 }

src/Mapping/Exception/MappingNotFoundException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Dynamap\Mapping\Exception;
+
+class MappingNotFoundException extends \Exception
+{
+}

src/Mapping/Exception/NoFieldsMappedForClassException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Dynamap\Mapping\Exception;
+
+class NoFieldsMappedForClassException extends \Exception
+{
+}

src/Mapping/Field/BooleanField.php

@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace Dynamap\Mapping\Field;
+
+class BooleanField implements DynamoDBField
+{
+    public function getDynamoDBFieldType(): string
+    {
+        return 'BOOL';
+    }
+}

src/Mapping/Field/DateTimeField.php

@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace Dynamap\Mapping\Field;
+
+class DateTimeField implements DynamoDBField
+{
+    public function getDynamoDBFieldType(): string
+    {
+        return 'S';
+    }
+}

src/Mapping/Field/DynamoDBField.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Dynamap\Mapping\Field;
+
+interface DynamoDBField
+{
+    public function getDynamoDBFieldType(): string;
+}

src/Mapping/Field/NumberField.php

@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace Dynamap\Mapping\Field;
+
+class NumberField implements DynamoDBField
+{
+    public function getDynamoDBFieldType(): string
+    {
+        return 'N';
+    }
+}

src/Mapping/Field/StringField.php

@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace Dynamap\Mapping\Field;
+
+class StringField implements DynamoDBField
+{
+    public function getDynamoDBFieldType(): string
+    {
+        return 'S';
+    }
+}

src/Mapping/FieldMappingFactory.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Dynamap\Mapping;
+
+use Dynamap\Mapping\Field\BooleanField;
+use Dynamap\Mapping\Field\DynamoDBField;
+use Dynamap\Mapping\Field\NumberField;
+use Dynamap\Mapping\Field\StringField;
+
+class FieldMappingFactory
+{
+    public function getDynamoDBType(string $propertyType): DynamoDBField
+    {
+        switch (strtolower($propertyType)) {
+            case 'uuid' :
+            case 'string':
+            case 'datetime':
+                return new StringField();
+                break;
+            case 'float':
+            case 'integer':
+                return new NumberField();
+                break;
+            case 'bool':
+                return new BooleanField();
+                break;
+            default: // todo: add a test for this
+                throw new InvalidMappingTypeException();
+        }
+    }
+}

src/Mapping/Mapping.php

@@ -2,6 +2,7 @@
 
 namespace Dynamap\Mapping;
 
+use Dynamap\Mapping\Exception\ClassNameInvalidException;
 use Dynamap\Mapping\Exception\NoTableSpeficiedException;
 
 final class Mapping
@@ -11,7 +12,7 @@ final class Mapping
 
     private function __construct(array $mapping)
     {
-//        var_dump($mapping);
+        $this->mapping = $mapping;
     }
 
     public static function fromConfigArray(array $config)
@@ -27,4 +28,21 @@ public static function fromConfigArray(array $config)
 
         return new static($mapping);
     }
+
+    public function getTableFor(string $className): string
+    {
+        // todo: add a test for this
+        if (false === \class_exists($className)) {
+            throw new ClassNameInvalidException('Get table for ' . $className . ' as the class was not found');
+        }
+
+        foreach ($this->mapping as $mappedTable) {
+            if ($mappedTable->containsMappingForClass($className)) {
+                return $mappedTable->getTableName();
+            }
+        }
+
+        // todo: add a test for this
+        throw new ClassNotMappedException('The class ' . $className . ' was not found in the mapping configuration');
+    }
 }

src/Mapping/TableMapping.php

@@ -42,4 +42,16 @@ public function getTableName(): string
     {
         return $this->tableName;
     }
+
+    // todo: add a test for this method
+    public function containsMappingForClass(string $className): bool
+    {
+        foreach ($this->classMappings as $classMapping) {
+            if ($className === $classMapping->getClassName()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }

tests/Fixture/Tag.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Dynamap\Test\Fixture;
+
+class Tag
+{
+
+}

tests/Mapping/ClassMappingTest.php

@@ -37,15 +37,17 @@ public function test fields are mapped(): void
                 'createdAt' => 'datetime',
                 'rating' => 'float',
                 'numComments' => 'integer',
+                'published' => 'bool'
             ],
         ];
 
         $classMapping = ClassMapping::fromArray(Article::class, $mapping);
 
-        $this->assertSame('S', $classMapping->getMappedProperty('id')->getDynamoDBType());
-        $this->assertSame('S', $classMapping->getMappedProperty('name')->getDynamoDBType());
-        $this->assertSame('S', $classMapping->getMappedProperty('createdAt')->getDynamoDBType());
-        $this->assertSame('N', $classMapping->getMappedProperty('rating')->getDynamoDBType());
-        $this->assertSame('N', $classMapping->getMappedProperty('numComments')->getDynamoDBType());
+        $this->assertSame('S', $classMapping->getMappedProperty('id')->getDynamoDBFieldType());
+        $this->assertSame('S', $classMapping->getMappedProperty('name')->getDynamoDBFieldType());
+        $this->assertSame('S', $classMapping->getMappedProperty('createdAt')->getDynamoDBFieldType());
+        $this->assertSame('N', $classMapping->getMappedProperty('rating')->getDynamoDBFieldType());
+        $this->assertSame('N', $classMapping->getMappedProperty('numComments')->getDynamoDBFieldType());
+        $this->assertSame('BOOL', $classMapping->getMappedProperty('published')->getDynamoDBFieldType());
     }
 }

tests/Mapping/MappingTest.php

@@ -6,6 +6,7 @@
 use Dynamap\Mapping\Mapping;
 use Dynamap\Test\Fixture\Article;
 use Dynamap\Test\Fixture\Author;
+use Dynamap\Test\Fixture\Tag;
 use PHPUnit\Framework\TestCase;
 
 class MappingTest extends TestCase
@@ -35,9 +36,19 @@ public function test a table mapping is created(): void
                         Author::class => [],
                     ],
                 ],
+                [
+                    // if you're thinking about using mulitple tables, go back and read the AWS docs on why you shouldn't.
+                    // then (and only then) come back and think about if you actually _really_ do want to do this.
+                    'name' => 'other_table',
+                    'mappings' => [
+                        Tag::class => []
+                    ]
+                ]
             ],
         ]);
 
-//        $this->assertSame('my_table', $mapping->getTableFor(Article::class));
+        $this->assertSame('my_table', $mapping->getTableFor(Article::class));
+        $this->assertSame('my_table', $mapping->getTableFor(Author::class));
+        $this->assertSame('other_table', $mapping->getTableFor(Tag::class));
     }
 }