Add support for generating method names

Add `MethodNameGenerator` to support generation of method names.

See gh-28414

spring-core/src/test/java/org/springframework/aot/generate/MethodNameGeneratorTests.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.aot.generate;
+
+import java.io.InputStream;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link MethodNameGenerator}.
+ *
+ * @author Phillip Webb
+ */
+class MethodNameGeneratorTests {
+
+	private final MethodNameGenerator generator = new MethodNameGenerator();
+
+	@Test
+	void createWithReservedNamesReservesNames() {
+		MethodNameGenerator generator = new MethodNameGenerator("testName");
+		assertThat(generator.generateMethodName("test", "name")).hasToString("testName1");
+	}
+
+	@Test
+	void generateMethodNameGeneratesName() {
+		String generated = this.generator.generateMethodName("register", "myBean",
+				"bean");
+		assertThat(generated).isEqualTo("registerMyBeanBean");
+	}
+
+	@Test
+	void generateMethodNameWhenHasNonLettersGeneratesName() {
+		String generated = this.generator.generateMethodName("register", "myBean123",
+				"bean");
+		assertThat(generated).isEqualTo("registerMyBeanBean");
+	}
+
+	@Test
+	void generateMethodNameWhenHasDotsGeneratesCamelCaseName() {
+		String generated = this.generator.generateMethodName("register",
+				"org.springframework.example.bean");
+		assertThat(generated).isEqualTo("registerOrgSpringframeworkExampleBean");
+	}
+
+	@Test
+	void generateMethodNameWhenMultipleCallsGeneratesSequencedName() {
+		String generated1 = this.generator.generateMethodName("register", "myBean123",
+				"bean");
+		String generated2 = this.generator.generateMethodName("register", "myBean!",
+				"bean");
+		String generated3 = this.generator.generateMethodName("register", "myBean%%",
+				"bean");
+		assertThat(generated1).isEqualTo("registerMyBeanBean");
+		assertThat(generated2).isEqualTo("registerMyBeanBean1");
+		assertThat(generated3).isEqualTo("registerMyBeanBean2");
+	}
+
+	@Test
+	void generateMethodNameWhenAllEmptyPartsGeneratesSetName() {
+		String generated = this.generator.generateMethodName("123");
+		assertThat(generated).isEqualTo("$$aot");
+	}
+
+	@Test
+	void joinReturnsJoinedName() {
+		assertThat(MethodNameGenerator.join("get", "bean", "factory"))
+				.isEqualTo("getBeanFactory");
+		assertThat(MethodNameGenerator.join("get", null, "factory"))
+				.isEqualTo("getFactory");
+		assertThat(MethodNameGenerator.join(null, null)).isEqualTo("");
+		assertThat(MethodNameGenerator.join("", null)).isEqualTo("");
+		assertThat(MethodNameGenerator.join("get", InputStream.class))
+				.isEqualTo("getInputStream");
+
+	}
+
+}