Change "insert space" setting for type parameters based on Java version

Change `insert_space_after_closing_angle_bracket_in_type_parameters`
setting when Java 8 is used so that a space is inserted after the
parameter type. Later versions of the Eclipse formatter can use
`do not insert` and they will correctly format classes. Earlier versions
need to use `insert` otherwise the space disappears.

This commit effectively reverts commit b11499d for Java 8 only. This
shouldn't be a problem since records were introduced in Java 14.

Fixes gh-363

spring-javaformat/spring-javaformat-formatter-tests/src/test/java/io/spring/javaformat/formatter/AbstractFormatterTests.java

@@ -54,18 +54,27 @@ protected static Item[] items(String expectedOverride) {
 		File configDir = new File("src/test/resources/config");
 		File expectedOverrideDir = new File("src/test/resources/" + expectedOverride);
 		for (File source : sourceDir.listFiles((dir, name) -> !name.startsWith("."))) {
-			File expected = new File(expectedOverrideDir, source.getName());
-			if (!expected.exists()) {
-				expected = new File(expectedDir, source.getName());
-			}
 			File config = new File(configDir, source.getName());
 			for (JavaBaseline javaBaseline : JavaBaseline.values()) {
+				File expected = getExpected(source, javaBaseline, expectedOverrideDir, expectedDir);
 				addItem(items, javaBaseline, source, expected, config);
 			}
 		}
 		return items.toArray(new Item[0]);
 	}
 
+	private static File getExpected(File source, JavaBaseline javaBaseline, File... expectedDirs) {
+		for (File expectedDir : expectedDirs) {
+			File versionSpecificExpectedDir = new File(expectedDir, javaBaseline.toString().toLowerCase());
+			File expected = new File(versionSpecificExpectedDir, source.getName());
+			expected = (!expected.exists()) ? new File(expectedDir, source.getName()) : expected;
+			if (expected.exists()) {
+				return expected;
+			}
+		}
+		throw new IllegalStateException("Unable to find expected file");
+	}
+
 	private static void addItem(List<Item> items, JavaBaseline javaBaseline, File source, File expected, File config) {
 		if (source.getName().contains("lineendings")) {
 			items.add(new Item(javaBaseline, copy(source, LineEnding.CR), copy(expected, LineEnding.CR), config));

spring-javaformat/spring-javaformat-formatter-tests/src/test/resources/expected/generics.txt

@@ -0,0 +1,8 @@
+package simple;
+
+/**
+ * gh-363.
+ */
+class SpectatorToDoubleGauge<T> extends AbstractMeter<T> implements Gauge {
+
+}

spring-javaformat/spring-javaformat-formatter-tests/src/test/resources/expected/v8/record-with-generic.txt

@@ -0,0 +1,11 @@
+package simple;
+
+/**
+ * Record with generic.
+ *
+ * @author Andy Wilkinson
+ * @since 1.0.0
+ */
+public record SomeRecord<T> (T item) {
+
+}

spring-javaformat/spring-javaformat-formatter-tests/src/test/resources/source/generics.txt

@@ -0,0 +1,8 @@
+package simple;
+
+/**
+ * gh-363.
+ */
+class SpectatorToDoubleGauge<T> extends AbstractMeter<T> implements Gauge {
+
+}

spring-javaformat/spring-javaformat-formatter/src/main/java/io/spring/javaformat/formatter/eclipse/Options.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2021 the original author or authors.
+ * Copyright 2017-2023 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.
@@ -24,6 +24,7 @@
 import java.util.Properties;
 
 import io.spring.javaformat.config.IndentationStyle;
+import io.spring.javaformat.config.JavaBaseline;
 import io.spring.javaformat.config.JavaFormatConfig;
 
 /**
@@ -63,8 +64,12 @@ private Map<String, String> loadProperties() throws IOException {
 	}
 
 	private void applyConfig(Map<String, String> properties, JavaFormatConfig javaFormatConfig) {
+		String coreFormatter = this.prefix + ".core.formatter.";
 		if (javaFormatConfig.getIndentationStyle() == IndentationStyle.SPACES) {
-			properties.put(this.prefix + ".core.formatter.tabulation.char", "space");
+			properties.put(coreFormatter + "tabulation.char", "space");
+		}
+		if (javaFormatConfig.getJavaBaseline() == JavaBaseline.V8) {
+			properties.put(coreFormatter + "insert_space_after_closing_angle_bracket_in_type_parameters", "insert");
 		}
 	}