add java21 variant

vocabulary-format-assertion/src/main/java21/io/github/sebastiantoepfer/jsonschema/vocabulary/format/assertion/abnf/reader/ConcationTypeSwitch.java

@@ -0,0 +1,56 @@
+/*
+ * 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.vocabulary.format.assertion.abnf.reader;
+
+import io.github.sebastiantoepfer.jsonschema.vocabulary.format.assertion.abnf.element.Element;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+class ConcationTypeSwitch {
+
+    private final ExtractorOwner owner;
+    private final ElementEndDetector endOfElementDetector;
+    private final List<Element> elements;
+
+    public ConcationTypeSwitch(
+        final ExtractorOwner owner,
+        final ElementEndDetector endOfElementDetector,
+        final List<Element> elements
+    ) {
+        this.owner = Objects.requireNonNull(owner);
+        this.endOfElementDetector = Objects.requireNonNull(endOfElementDetector);
+        this.elements = List.copyOf(elements);
+    }
+
+    public Extractor switchTo(final ExtractorOwnerFactory ownerFactory, final ExtractorFactory targetFactory) {
+        final List<Element> newElements = new ArrayList<>(elements);
+        final Element element = newElements.removeLast();
+        return targetFactory.create(
+            ownerFactory.create(owner, endOfElementDetector, newElements),
+            endOfElementDetector,
+            element
+        );
+    }
+}