split core into multiple parts

i know with java modules it's not longer needed, but is helps me to
create a better structure.

api/pom.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>io.github.sebastian-toepfer.json-schema</groupId>
+        <artifactId>json-schema</artifactId>
+        <version>0.1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>json-schema-api</artifactId>
+    <name>Json Schema :: api</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>jakarta.json</groupId>
+            <artifactId>jakarta.json-api</artifactId>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.eclipse.parsson</groupId>
+            <artifactId>parsson</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/ConstraintViolation.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/ConstraintViolation.java

@@ -21,6 +21,6 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core;
+package io.github.sebastiantoepfer.jsonschema;
 
 public final class ConstraintViolation {}

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/InstanceType.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/InstanceType.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core;
+package io.github.sebastiantoepfer.jsonschema;
 
 import jakarta.json.JsonNumber;
 import jakarta.json.JsonValue;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/JsonSchema.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/JsonSchema.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core;
+package io.github.sebastiantoepfer.jsonschema;
 
 import jakarta.json.JsonValue;
 

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/JsonSchemas.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/JsonSchemas.java

@@ -21,9 +21,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core;
+package io.github.sebastiantoepfer.jsonschema;
 
-import io.github.sebastiantoepfer.jsonschema.core.spi.JsonSchemaFactory;
+import io.github.sebastiantoepfer.jsonschema.spi.JsonSchemaFactory;
 import jakarta.json.Json;
 import jakarta.json.JsonReader;
 import jakarta.json.JsonValue;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/Validator.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/Validator.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core;
+package io.github.sebastiantoepfer.jsonschema;
 
 import jakarta.json.Json;
 import jakarta.json.JsonReader;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/Vocabulary.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/Vocabulary.java

@@ -21,9 +21,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core;
+package io.github.sebastiantoepfer.jsonschema;
 
-import io.github.sebastiantoepfer.jsonschema.core.keyword.KeywordType;
+import io.github.sebastiantoepfer.jsonschema.keyword.KeywordType;
 import java.net.URI;
 import java.util.Optional;
 

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/Annotation.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/Annotation.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import jakarta.json.JsonValue;
 import java.util.Collection;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/Applicator.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/Applicator.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import jakarta.json.JsonValue;
 import java.util.Collection;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/Assertion.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/Assertion.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import jakarta.json.JsonValue;
 import java.util.Collection;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/DefaultAnnotation.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/DefaultAnnotation.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import jakarta.json.JsonValue;
 import java.util.Objects;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/Identifier.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/Identifier.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import java.net.URI;
 import java.util.Collection;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/Keyword.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/Keyword.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import java.util.Collection;
 

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/KeywordType.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/KeywordType.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import jakarta.json.JsonValue;
 import java.util.Objects;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/keyword/ReservedLocation.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/keyword/ReservedLocation.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import java.util.Collection;
 import java.util.Set;

core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/spi/JsonSchemaFactory.java → api/src/main/java/io/github/sebastiantoepfer/jsonschema/spi/JsonSchemaFactory.java

@@ -21,9 +21,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.spi;
+package io.github.sebastiantoepfer.jsonschema.spi;
 
-import io.github.sebastiantoepfer.jsonschema.core.JsonSchema;
+import io.github.sebastiantoepfer.jsonschema.JsonSchema;
 import jakarta.json.JsonValue;
 
 public interface JsonSchemaFactory {

api/src/main/java/module-info.java

@@ -0,0 +1,31 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2023 sebastian.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+module io.github.sebastiantoepfer.jsonschema {
+    exports io.github.sebastiantoepfer.jsonschema;
+    exports io.github.sebastiantoepfer.jsonschema.keyword;
+    exports io.github.sebastiantoepfer.jsonschema.spi;
+
+    requires jakarta.json;
+}

api/src/test/java/io/github/sebastiantoepfer/jsonschema/FakeJsonSchemaFactory.java

@@ -0,0 +1,45 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2023 sebastian.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.github.sebastiantoepfer.jsonschema;
+
+import io.github.sebastiantoepfer.jsonschema.spi.JsonSchemaFactory;
+import jakarta.json.JsonValue;
+
+public final class FakeJsonSchemaFactory implements JsonSchemaFactory {
+
+    @Override
+    public JsonSchema create(final JsonValue schema) {
+        return new JsonSchema() {
+            @Override
+            public Validator validator() {
+                throw new UnsupportedOperationException("Not supported yet.");
+            }
+
+            @Override
+            public JsonValue.ValueType getValueType() {
+                throw new UnsupportedOperationException("Not supported yet.");
+            }
+        };
+    }
+}

api/src/test/java/io/github/sebastiantoepfer/jsonschema/InstanceTypeTest.java

@@ -0,0 +1,75 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2023 sebastian.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.github.sebastiantoepfer.jsonschema;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+import jakarta.json.Json;
+import jakarta.json.JsonValue;
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class InstanceTypeTest {
+
+    @ParameterizedTest
+    @MethodSource("provideWithValidCombinations")
+    void should_be_true_if_instancetype_is_correct(final InstanceType instanceType, final JsonValue value) {
+        assertThat(instanceType.isInstance(value), is(true));
+    }
+
+    static Stream<? extends Arguments> provideWithValidCombinations() {
+        return Stream.of(
+            Arguments.of(InstanceType.NULL, JsonValue.NULL),
+            Arguments.of(InstanceType.BOOLEAN, JsonValue.FALSE),
+            Arguments.of(InstanceType.BOOLEAN, JsonValue.TRUE),
+            Arguments.of(InstanceType.OBJECT, JsonValue.EMPTY_JSON_OBJECT),
+            Arguments.of(InstanceType.ARRAY, JsonValue.EMPTY_JSON_ARRAY),
+            Arguments.of(InstanceType.NUMBER, Json.createValue(23L)),
+            Arguments.of(InstanceType.INTEGER, Json.createValue(23L)),
+            Arguments.of(InstanceType.INTEGER, Json.createValue(0.0))
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("provideWithInvalidCombinations")
+    void should_be_false_if_instancetype_is_correct(final InstanceType instanceType, final JsonValue value) {
+        assertThat(instanceType.isInstance(value), is(false));
+    }
+
+    static Stream<? extends Arguments> provideWithInvalidCombinations() {
+        return Stream.of(
+            Arguments.of(InstanceType.NULL, JsonValue.TRUE),
+            Arguments.of(InstanceType.BOOLEAN, JsonValue.EMPTY_JSON_OBJECT),
+            Arguments.of(InstanceType.BOOLEAN, JsonValue.EMPTY_JSON_ARRAY),
+            Arguments.of(InstanceType.OBJECT, JsonValue.EMPTY_JSON_ARRAY),
+            Arguments.of(InstanceType.ARRAY, JsonValue.TRUE),
+            Arguments.of(InstanceType.NUMBER, Json.createValue("string")),
+            Arguments.of(InstanceType.INTEGER, Json.createValue(23.2)),
+            Arguments.of(InstanceType.INTEGER, Json.createValue("test"))
+        );
+    }
+}

core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/JsonSchemasTest.java → api/src/test/java/io/github/sebastiantoepfer/jsonschema/JsonSchemasTest.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core;
+package io.github.sebastiantoepfer.jsonschema;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;

core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/keyword/AnnotationTest.java → api/src/test/java/io/github/sebastiantoepfer/jsonschema/keyword/AnnotationTest.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;

core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/keyword/ApplicatorTest.java → api/src/test/java/io/github/sebastiantoepfer/jsonschema/keyword/ApplicatorTest.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;

core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/keyword/AssertionTest.java → api/src/test/java/io/github/sebastiantoepfer/jsonschema/keyword/AssertionTest.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;

core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/keyword/DefaultAnnotationTest.java → api/src/test/java/io/github/sebastiantoepfer/jsonschema/keyword/DefaultAnnotationTest.java

@@ -21,7 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package io.github.sebastiantoepfer.jsonschema.core.keyword;
+package io.github.sebastiantoepfer.jsonschema.keyword;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;