Auto generate OSGi require bundle header

jhdf/build.gradle

@@ -105,7 +105,7 @@ jar {
             'Bundle-Vendor': 'James Mudd',
             'Bundle-Version': project.version,
             'Export-Package': 'io.jhdf,io.jhdf.*,io.jhdf.api,io.jhdf.api.*',
-            'Require-Bundle': 'slf4j.api;bundle-version="1.7.36",org.apache.commons.lang3;bundle-version="3.17.0",com.ning.compress-lzf;bundle-version="1.1.2",lz4-java;bundle-version="1.8.0"',
+            'Require-Bundle': buildRequireBundleHeader(),
             // Build data
             'Build-JDK': System.getProperty('java.vendor') + ' ' + System.getProperty('java.version'),
             'Build-OS': System.getProperty('os.name') + ' ' + System.getProperty('os.version'),
@@ -198,6 +198,9 @@ signing {
 
 import com.github.spotbugs.snom.Confidence
 import com.github.spotbugs.snom.Effort
+
+import java.util.stream.Collectors
+
 spotbugs {
     ignoreFailures = true // Allow build to continue with errors
     effort = Effort.valueOf('MAX')
@@ -222,3 +225,28 @@ sonarqube {
         property "sonar.java.checkstyle.reportPaths", "build/reports/checkstyle/main.xml,build/reports/checkstyle/test.xml"
     }
 }
+
+String buildRequireBundleHeader() {
+    def runtimeDependencies = configurations.runtimeClasspath.getAllDependencies()
+    def bundleToModule = [
+        "slf4j.api": "org.slf4j:slf4j-api",
+        "org.apache.commons.lang3": "org.apache.commons:commons-lang3",
+        "com.ning.compress-lzf": "com.ning:compress-lzf",
+        "lz4-java": "org.lz4:lz4-java"
+    ]
+
+    def moduleToVersion = runtimeDependencies.collectEntries {
+        [it.module.toString(), it.version]
+    }
+
+    //  Check here to catch when dependencies are added/removed
+    if(!bundleToModule.values().containsAll(moduleToVersion.keySet())) {
+        throw new IllegalStateException("Runtime dependencies not mapped for OSGi")
+    }
+
+    def header = bundleToModule.entrySet().stream()
+        .map {"${it.key};bundle-version=\"${moduleToVersion.get(it.value)}\"" }
+        .collect(Collectors.joining(","))
+
+    return header
+}