From 5597825438bbdef935047f860781e0c4d62eb93e Mon Sep 17 00:00:00 2001
From: Hannes Wellmann <wellmann.hannes1@gmx.net>
Date: Wed, 14 Feb 2024 00:14:28 +0100
Subject: [PATCH] Provide utility to obtain the BREE from a EE requirement

---
 .../pde/internal/core/util/ManifestUtils.java | 71 ++++++++++++++++++-
 1 file changed, 70 insertions(+), 1 deletion(-)

diff --git a/ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/util/ManifestUtils.java b/ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/util/ManifestUtils.java
index f2b7db192e..b806a9c385 100644
--- a/ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/util/ManifestUtils.java
+++ b/ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/util/ManifestUtils.java
@@ -13,11 +13,16 @@
  *******************************************************************************/
 package org.eclipse.pde.internal.core.util;
 
+import static org.osgi.framework.namespace.ExecutionEnvironmentNamespace.CAPABILITY_VERSION_ATTRIBUTE;
+import static org.osgi.framework.namespace.ExecutionEnvironmentNamespace.EXECUTION_ENVIRONMENT_NAMESPACE;
+
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Writer;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.LinkedList;
@@ -25,6 +30,8 @@
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.jar.JarFile;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
@@ -38,6 +45,8 @@
 import org.eclipse.jdt.core.IPackageFragmentRoot;
 import org.eclipse.jdt.core.JavaCore;
 import org.eclipse.jdt.core.JavaModelException;
+import org.eclipse.jdt.launching.JavaRuntime;
+import org.eclipse.jdt.launching.environments.IExecutionEnvironment;
 import org.eclipse.osgi.util.ManifestElement;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.pde.core.build.IBuild;
@@ -50,6 +59,9 @@
 import org.eclipse.pde.internal.core.project.PDEProject;
 import org.osgi.framework.BundleException;
 import org.osgi.framework.Constants;
+import org.osgi.framework.Filter;
+import org.osgi.framework.FrameworkUtil;
+import org.osgi.framework.InvalidSyntaxException;
 
 public class ManifestUtils {
 
@@ -77,7 +89,7 @@ public class ManifestUtils {
 	 * <p>
 	 * If this method is being called from a dev mode workspace, the returned map
 	 * should be passed to {@link TargetWeaver#weaveManifest(Map, File)} so that the
-	 * bundle classpath can be corrected. 
+	 * bundle classpath can be corrected.
 	 * </p>
 	 * <p>
 	 * This method is called by
@@ -285,4 +297,61 @@ private static String splitOnComma(String value) {
 		sb.append(values[values.length - 1]);
 		return sb.toString();
 	}
+
+
+	// Simple filters are for example (&(version=17)(osgi.ee=JavaSE))
+	private static final Pattern SIMPLE_EE_FILTER;
+	private static final int NAME_GROUP = 2;
+	private static final int VERSION_GROUP = 3;
+	static {
+		String nameSegment = "\\(" + EXECUTION_ENVIRONMENT_NAMESPACE + "=([\\w/]+)\\)"; //$NON-NLS-1$//$NON-NLS-2$
+		String versionSegment = "\\(" + CAPABILITY_VERSION_ATTRIBUTE + "=([\\d\\.]+)\\)"; //$NON-NLS-1$ //$NON-NLS-2$
+		SIMPLE_EE_FILTER = Pattern.compile("\\(&(" + nameSegment + ")|(" + versionSegment + ")\\)"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+	}
+
+	private static final List<Map<String, String>> AVAILABLE_EE_PROPERTIES = createEEProperties();
+
+	private static List<Map<String, String>> createEEProperties() {
+		IExecutionEnvironment[] availableEEs = JavaRuntime.getExecutionEnvironmentsManager().getExecutionEnvironments();
+		List<Map<String, String>> eeProperties = Arrays.stream(availableEEs).map(ee -> {
+			String id = ee.getId();
+			int versionSeparator = id.lastIndexOf('-');
+			if (versionSeparator < 0) {
+				throw new IllegalArgumentException("Missing version-separator in EE Id"); //$NON-NLS-1$
+			}
+			String name = id.substring(0, versionSeparator);
+			String version = id.substring(versionSeparator + 1);
+			return Map.of(EXECUTION_ENVIRONMENT_NAMESPACE, name, CAPABILITY_VERSION_ATTRIBUTE, version);
+		}).toList();
+		return eeProperties;
+	}
+
+	public static List<String> parseRequiredEEsFromFilter(String eeFilter) {
+		if (eeFilter.chars().anyMatch(Character::isWhitespace)) {
+			eeFilter = eeFilter.replaceAll("\\s*", ""); //$NON-NLS-1$ //$NON-NLS-2$
+		}
+		Matcher matcher = SIMPLE_EE_FILTER.matcher(eeFilter);
+		if (matcher.matches()) { // fast track
+			String name = matcher.group(NAME_GROUP);
+			String version = matcher.group(VERSION_GROUP);
+			if (name != null && version != null) {
+				return List.of(name + "-" + version); //$NON-NLS-1$
+			}
+		}
+		try { // complex filter. Collect all matching EEs
+			Filter filter = FrameworkUtil.createFilter(eeFilter);
+			List<String> requiredEEs = new ArrayList<>();
+			for (Map<String, String> ee : AVAILABLE_EE_PROPERTIES) {
+				if (filter.matches(ee)) {
+					String name = ee.get(EXECUTION_ENVIRONMENT_NAMESPACE);
+					String version = ee.get(CAPABILITY_VERSION_ATTRIBUTE);
+					requiredEEs.add(name + "-" + version); //$NON-NLS-1$
+				}
+			}
+			return requiredEEs;
+		} catch (InvalidSyntaxException e) { // should not happen
+			throw new IllegalArgumentException("Invalid execution environment filter", e); //$NON-NLS-1$
+		}
+	}
+
 }