feat: can now install multiple JDKs of same major version

The jbang provider no longer uses the major version number to determine
if a JDK has been installed or not. This means multiple JDKs can be
installed that have the same major version.

Fixes #46

# Conflicts:
#	src/main/java/dev/jbang/devkitman/jdkproviders/DefaultJdkProvider.java
#	src/main/java/dev/jbang/devkitman/jdkproviders/JBangJdkProvider.java
#	src/test/java/dev/jbang/devkitman/BaseTest.java

Author: quintesse

.justfile

@@ -10,7 +10,7 @@ clean:
 
 # build without tests
 build:
-    ./gradlew spotlessApply build -x test
+    ./gradlew spotlessApply build publishToMavenLocal -x test
 
 # run tests
 test:

src/main/java/dev/jbang/devkitman/Jdk.java

@@ -78,11 +78,7 @@ public Default(
 			@Override
 			@NonNull
 			public InstalledJdk install() {
-				if (!provider.canUpdate()) {
-					throw new UnsupportedOperationException(
-							"Installing a JDK is not supported by " + provider);
-				}
-				return provider.install(this);
+				return provider.manager().installJdk(this);
 			}
 
 			@Override
@@ -101,11 +97,6 @@ interface InstalledJdk extends Jdk {
 		@NonNull
 		Path home();
 
-		/**
-		 * Determines if the JDK version is fixed or that it can change
-		 */
-		boolean isFixedVersion();
-
 		@Override
 		default boolean isInstalled() {
 			return true;
@@ -117,7 +108,6 @@ default boolean isInstalled() {
 		void uninstall();
 
 		class Default extends Jdk.Default implements InstalledJdk {
-			private final boolean fixedVersion;
 			@Nullable
 			private final Path home;
 
@@ -130,18 +120,11 @@ public Default(
 					@NonNull String id,
 					@Nullable Path home,
 					@NonNull String version,
-					boolean fixedVersion,
 					@Nullable Set<String> tags) {
 				super(provider, id, version, tags != null ? tags : determineTagsFromJdkHome(home));
-				this.fixedVersion = fixedVersion;
 				this.home = home;
 			}
 
-			@Override
-			public boolean isFixedVersion() {
-				return fixedVersion;
-			}
-
 			@Override
 			@NonNull
 			public Path home() {
@@ -154,7 +137,7 @@ public Path home() {
 
 			@Override
 			public void uninstall() {
-				provider.uninstall(this);
+				provider.manager().uninstallJdk(this);
 			}
 
 			@Override
@@ -184,7 +167,8 @@ public int compareTo(Jdk o) {
 
 			@Override
 			public String toString() {
-				return majorVersion() + " (" + version + (isFixedVersion() ? " [fixed]" : " [dynamic]") + ", " + id
+				return majorVersion() + " (" + version + (provider.hasFixedVersions() ? " [fixed]" : " [dynamic]")
+						+ ", " + id
 						+ ", "
 						+ home + ", " + tags + "))";
 			}
@@ -310,6 +294,14 @@ public static <T extends Jdk> Predicate<T> openVersion(int version) {
 			return jdk -> jdk.majorVersion() >= version;
 		}
 
+		public static <T extends Jdk> Predicate<T> minVersion(int version) {
+			return jdk -> jdk.majorVersion() >= version;
+		}
+
+		public static <T extends Jdk> Predicate<T> maxVersion(int version) {
+			return jdk -> jdk.majorVersion() <= version;
+		}
+
 		public static <T extends Jdk> Predicate<T> forVersion(String version) {
 			int v = JavaUtils.parseJavaVersion(version);
 			return forVersion(v, JavaUtils.isOpenVersion(version));
@@ -328,7 +320,7 @@ public static <T extends Jdk> Predicate<T> allTags(Set<String> tags) {
 		}
 
 		public static <T extends InstalledJdk> Predicate<T> fixedVersion() {
-			return InstalledJdk::isFixedVersion;
+			return jdk -> jdk.provider().hasFixedVersions();
 		}
 
 		public static <T extends InstalledJdk> Predicate<T> path(Path jdkPath) {

src/main/java/dev/jbang/devkitman/JdkInstaller.java

@@ -1,7 +1,7 @@
 package dev.jbang.devkitman;
 
 import java.nio.file.Path;
-import java.util.List;
+import java.util.stream.Stream;
 
 import org.jspecify.annotations.NonNull;
 import org.jspecify.annotations.Nullable;
@@ -23,7 +23,7 @@ public interface JdkInstaller {
 	 * @return List of <code>Jdk</code> objects
 	 */
 	@NonNull
-	default List<Jdk.AvailableJdk> listAvailable() {
+	default Stream<Jdk.AvailableJdk> listAvailable() {
 		throw new UnsupportedOperationException(
 				"Listing available JDKs is not supported by " + getClass().getName());
 	}
@@ -38,7 +38,7 @@ default List<Jdk.AvailableJdk> listAvailable() {
 	 * @return A <code>Jdk</code> object or <code>null</code>
 	 */
 	default Jdk.@Nullable AvailableJdk getAvailableByVersion(int version, boolean openVersion) {
-		return listAvailable().stream()
+		return listAvailable()
 			.filter(Jdk.Predicates.forVersion(version, openVersion))
 			.findFirst()
 			.orElse(null);
@@ -58,7 +58,7 @@ default List<Jdk.AvailableJdk> listAvailable() {
 	 * @return A <code>Jdk</code> object or <code>null</code>
 	 */
 	default Jdk.@Nullable AvailableJdk getAvailableByIdOrToken(String idOrToken) {
-		return listAvailable().stream()
+		return listAvailable()
 			.filter(Jdk.Predicates.id(idOrToken))
 			.findFirst()
 			.orElse(null);