add support for OpenJDK Early Access builds

changelog/@unreleased/pr-423.v2.yml

@@ -0,0 +1,5 @@
+type: improvement
+improvement:
+  description: add support for Project Loom JDK24 Early Access builds
+  links:
+  - https://github.com/palantir/gradle-jdks/pull/423

gradle-jdks-distributions/src/main/java/com/palantir/gradle/jdks/JdkDistributionName.java

@@ -24,7 +24,8 @@
 public enum JdkDistributionName {
     AZUL_ZULU,
     AMAZON_CORRETTO,
-    GRAALVM_CE;
+    GRAALVM_CE,
+    JAVA_EARLY_ACCESS;
 
     JdkDistributionName() {}
 

gradle-jdks/src/main/java/com/palantir/gradle/jdks/JavaEarlyAccessJdkDistribution.java

@@ -0,0 +1,186 @@
+/*
+ * (c) Copyright 2024 Palantir Technologies Inc. All rights reserved.
+ *
+ * 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
+ *
+ *     http://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 com.palantir.gradle.jdks;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Splitter;
+import com.palantir.gradle.jdks.JdkPath.Extension;
+import com.palantir.gradle.jdks.setup.common.Arch;
+import com.palantir.gradle.jdks.setup.common.Os;
+import java.util.List;
+import java.util.Optional;
+import org.immutables.value.Value;
+
+public final class JavaEarlyAccessJdkDistribution implements JdkDistribution {
+    // example artifact uris:
+    // jdk24 EA:
+    // https://download.java.net/java/early_access/jdk24/17/GPL/openjdk-24-ea+17_linux-aarch64_bin.tar.gz
+    // loom jdk24 EA:
+    // https://download.java.net/java/early_access/loom/7/openjdk-24-loom+7-60_linux-aarch64_bin.tar.gz
+    // valhall jdk24 EA:
+    // https://download.java.net/java/early_access/valhalla/1/openjdk-23-valhalla+1-90_linux-aarch64_bin.tar.gz
+
+    @Override
+    public String defaultBaseUrl() {
+        return "https://download.java.net/java/early_access";
+    }
+
+    @Override
+    public JdkPath path(JdkRelease jdkRelease) {
+        EarlyAccessVersion eaVersion = parseEarlyAccessVersion(jdkRelease.version());
+
+        String pathPrefix = String.format("%s/%s", eaVersion.projectName(), eaVersion.earlyAccessMajorVersion());
+        if (eaVersion.projectName().equals("jdk24")) {
+            // jdk24 ea paths are a bit different, so we special-case them here
+            // (see also special-casing in parseEarlyAccessVersion which sets the project name to "jdk24")
+            // (see above, jdk24 EA builds have a "/GPL" in the path on download.java.net)
+            pathPrefix = pathPrefix + "/GPL";
+        }
+
+        String filename = String.format(
+                "openjdk-%s_%s-%s_bin",
+                eaVersion.fullJdkVersion(), os(jdkRelease.os()), arch(jdkRelease.arch(), jdkRelease.os()));
+
+        String fullPath = String.format("%s/%s", pathPrefix, filename);
+
+        return JdkPath.builder()
+                .filename(fullPath)
+                .extension(extension(jdkRelease.os()))
+                .build();
+    }
+
+    private static String os(Os os) {
+        switch (os) {
+            case MACOS:
+                return "macos";
+            case LINUX_GLIBC:
+                return "linux";
+            case WINDOWS:
+                return "windows";
+            default:
+                throw new UnsupportedOperationException("Case " + os + " not implemented");
+        }
+    }
+
+    private static String arch(Arch arch, Os os) {
+        switch (arch) {
+            case X86_64:
+                return "x64";
+            case AARCH64:
+                if (os == Os.WINDOWS) {
+                    throw new UnsupportedOperationException("Case " + arch + " not implemented on windows");
+                }
+                return "aarch64";
+            default:
+                throw new UnsupportedOperationException("Case " + arch + " not implemented");
+        }
+    }
+
+    private static Extension extension(Os operatingSystem) {
+        switch (operatingSystem) {
+            case LINUX_GLIBC:
+            case MACOS:
+                return Extension.TARGZ;
+            case WINDOWS:
+                return Extension.ZIP;
+            default:
+                throw new UnsupportedOperationException("Unknown OS: " + operatingSystem);
+        }
+    }
+
+    @VisibleForTesting
+    static EarlyAccessVersion parseEarlyAccessVersion(String fullVersion) {
+        // some examples:
+        //
+        // input: "24-ea+17"
+        // outputs:
+        //   projectName == "jdk24" (this is a special-case)
+        //   javaMajorVersion == "24-ea"
+        //   earlyAccessMajorVersion == "17"
+        //   earlyAccessMinorVersion == Optional.empty()
+        //
+        // input: "24-loom+7-60"
+        // outputs:
+        //   projectName == "loom"
+        //   javaMajorVersion == "24-loom"
+        //   earlyAccessMajorVersion == "7"
+        //   earlyAccessMinorVersion == "60"
+
+        List<String> parts = Splitter.on("+").splitToList(fullVersion);
+        if (parts.size() != 2) {
+            throw new IllegalArgumentException(String.format(
+                    "Expected %s to be of the form: `javaMajorVersion+earlyAccessMajorVersion`"
+                            + " or `javaMajorVersion+earlyAccessMajorVersion-earlyAccessMinorVersion`"
+                            + " (e.g. 24-loom+7-60 == Java Major Version: 24-loom, Early Access Major Version: 7,"
+                            + " Early Access Minor Version: 60)",
+                    fullVersion));
+        }
+
+        String javaMajorVersion = parts.get(0);
+        List<String> javaMajorVersionParts = Splitter.on("-").splitToList(javaMajorVersion);
+        if (javaMajorVersionParts.size() != 2) {
+            throw new IllegalArgumentException(String.format(
+                    "Expected %s to have javaMajorVersion of the form: `jvmVersion-projectName`"
+                            + " (e.g. 24-loom+7-60 == JVM Version: 24, Project Name: loom)",
+                    fullVersion));
+        }
+
+        String projectName = javaMajorVersionParts.get(1);
+        // special case: for JDK24 EA builds with a version string like "24-ea+17", the project name is "jdk24"
+        if (projectName.equals("ea")) {
+            projectName = "jdk24";
+        }
+
+        List<String> earlyAccessParts = Splitter.on("-").splitToList(parts.get(1));
+        if (earlyAccessParts.isEmpty()) {
+            throw new IllegalArgumentException(String.format(
+                    "Expected %s to be of the form: `javaMajorVersion+earlyAccessMajorVersion`"
+                            + " or `javaMajorVersion+earlyAccessMajorVersion-earlyAccessMinorVersion`"
+                            + " (e.g. 24-loom+7-60 == Java Major Version: 24-loom, Early Access Major Version: 7,"
+                            + " Early Access Minor Version: 60)",
+                    fullVersion));
+        }
+
+        ImmutableEarlyAccessVersion.Builder builder = ImmutableEarlyAccessVersion.builder()
+                .projectName(projectName)
+                .javaMajorVersion(parts.get(0))
+                .earlyAccessMajorVersion(earlyAccessParts.get(0));
+        if (earlyAccessParts.size() > 1) {
+            builder.earlyAccessMinorVersion(earlyAccessParts.get(1));
+        }
+
+        return builder.build();
+    }
+
+    @Value.Immutable
+    interface EarlyAccessVersion {
+        String projectName();
+
+        String javaMajorVersion();
+
+        String earlyAccessMajorVersion();
+
+        Optional<String> earlyAccessMinorVersion();
+
+        @Value.Derived
+        default String fullJdkVersion() {
+            String minorVersionSuffix =
+                    earlyAccessMinorVersion().map(v -> "-" + v).orElse("");
+            return String.format("%s+%s%s", javaMajorVersion(), earlyAccessMajorVersion(), minorVersionSuffix);
+        }
+    }
+}

gradle-jdks/src/main/java/com/palantir/gradle/jdks/JdkDistributions.java

@@ -26,7 +26,9 @@ final class JdkDistributions {
             JdkDistributionName.AMAZON_CORRETTO,
             new AmazonCorrettoJdkDistribution(),
             JdkDistributionName.GRAALVM_CE,
-            new GraalVmCeDistribution());
+            new GraalVmCeDistribution(),
+            JdkDistributionName.JAVA_EARLY_ACCESS,
+            new JavaEarlyAccessJdkDistribution());
 
     public JdkDistribution get(JdkDistributionName jdkDistributionName) {
         return Optional.ofNullable(JDK_DISTRIBUTIONS.get(jdkDistributionName))