API error on SWT on a 4.34 master

Don't try to add EE to bundles that don't have any requirements defined
in manifest.

ManifestUtils.getRequiredExecutionEnvironments() currently returns
"generic" bundle runtime requirements from OSGI for bundles that don't
define anything, and it seem to be violation of the
org.osgi.framework.wiring.BundleRevision.getDeclaredRequirements(String)
contract that isn't supposed to return anything if nothing is specified
in the manifest.

At least for API baseline tooling use of OSGI generic requirements not
specified in the manifest do not make sense, as we compare what's
written in the manifest and not what is derived from the platform or
host.

Fixes #1386

apitools/org.eclipse.pde.api.tools/src/org/eclipse/pde/api/tools/internal/model/BundleComponent.java

@@ -82,6 +82,7 @@
 import org.osgi.framework.Constants;
 import org.osgi.framework.FrameworkUtil;
 import org.osgi.framework.Version;
+import org.osgi.framework.namespace.ExecutionEnvironmentNamespace;
 import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
 
@@ -92,6 +93,8 @@
  */
 public class BundleComponent extends Component {
 
+	private static final String[] NO_EXECUTION_ENVIRONMENTS = new String[0];
+
 	static final String TMP_API_FILE_PREFIX = "api"; //$NON-NLS-1$
 
 	/**
@@ -310,7 +313,12 @@ protected void init() throws CoreException {
 				BundleDescription bundleDescription = getBundleDescription(manifest, fLocation, fBundleId);
 				fSymbolicName = bundleDescription.getSymbolicName();
 				fVersion = bundleDescription.getVersion();
-				fdeclaredRequiredEE = ManifestUtils.getRequiredExecutionEnvironments(bundleDescription).toArray(String[]::new);
+				if (hasDeclaredRequiredEE(manifest)) {
+					fdeclaredRequiredEE = ManifestUtils.getRequiredExecutionEnvironments(bundleDescription)
+							.toArray(String[]::new);
+				} else {
+					fdeclaredRequiredEE = NO_EXECUTION_ENVIRONMENTS;
+				}
 				setName(manifest.get(Constants.BUNDLE_NAME));
 				fBundleDescription = bundleDescription;
 			} catch (BundleException e) {
@@ -1204,4 +1212,28 @@ protected void baselineDisposed(IApiBaseline baseline) throws CoreException {
 						new Object[] { getName(), baseline.getName(), Thread.currentThread().getName() }),
 				disposeSource));
 	}
+
+	/*
+	 * This is a copy of
+	 * org.eclipse.pde.internal.core.MinimalState.hasDeclaredRequiredEE(Map<String,
+	 * String>). PDE ends up adding a synthetic EE to the manifest when that method
+	 * returns false, and that ends up in the bundle description such that we cannot
+	 * determine whether the EE was actually present or was synthesized. So we
+	 * repeat that computation here
+	 */
+	@SuppressWarnings("deprecation")
+	private boolean hasDeclaredRequiredEE(Map<String, String> manifest) {
+		if (manifest.containsKey(Constants.BUNDLE_REQUIREDEXECUTIONENVIRONMENT)) {
+			return true;
+		}
+		try {
+			String capability = manifest.get(Constants.REQUIRE_CAPABILITY);
+			ManifestElement[] header = ManifestElement.parseHeader(Constants.REQUIRE_CAPABILITY, capability);
+			return header != null && Arrays.stream(header).map(ManifestElement::getValue)
+					.anyMatch(ExecutionEnvironmentNamespace.EXECUTION_ENVIRONMENT_NAMESPACE::equals);
+		} catch (BundleException e) {
+			return false; // ignore
+		}
+	}
+
 }