1 files changed, 104 insertions, 0 deletions
diff --git a/plugins/toolsmiths/org.eclipse.papyrus.dev.project.management/src/org/eclipse/papyrus/dev/project/management/internal/operations/OptimizeDependenciesOperation.java b/plugins/toolsmiths/org.eclipse.papyrus.dev.project.management/src/org/eclipse/papyrus/dev/project/management/internal/operations/OptimizeDependenciesOperation.java
new file mode 100644
index 00000000000..87aed84f133
--- /dev/null
+++ b/plugins/toolsmiths/org.eclipse.papyrus.dev.project.management/src/org/eclipse/papyrus/dev/project/management/internal/operations/OptimizeDependenciesOperation.java
@@ -0,0 +1,104 @@
+/*****************************************************************************
+ * Copyright (c) 2016 Christian W. Damus and others.
+ * 
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Christian W. Damus - Initial API and implementation
+ *   
+ *****************************************************************************/
+
+package org.eclipse.papyrus.dev.project.management.internal.operations;
+
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.core.commands.ExecutionException;
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.OperationCanceledException;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.SubMonitor;
+import org.eclipse.papyrus.dev.project.management.internal.operations.DependencyAnalysisContext.APIExports;
+import org.eclipse.papyrus.dev.project.management.internal.operations.DependencyAnalysisContext.BundleAnalysis;
+import org.eclipse.papyrus.dev.project.management.internal.operations.DependencyAnalysisContext.DependencyGraph;
+import org.eclipse.papyrus.eclipse.project.editors.interfaces.IManifestEditor;
+import org.eclipse.papyrus.infra.tools.util.Iterables2;
+import org.eclipse.pde.core.project.IRequiredBundleDescription;
+
+/**
+ * Undoable "optimize dependencies" operation, which ensures re-exports of dependencies
+ * that contribute types to the exported API and removes redundancies (except where they are
+ * re-exported).
+ */
+public class OptimizeDependenciesOperation extends AbstractManifestUpdateOperation {
+
+	public OptimizeDependenciesOperation(Map<? extends IFile, ? extends IManifestEditor> manifests) {
+		super("Optimize Bundle Dependencies", manifests);
+	}
+
+	@Override
+	protected IStatus doExecute(IProgressMonitor monitor, Map<? extends IFile, ? extends IManifestEditor> manifests) throws ExecutionException {
+		SubMonitor sub = SubMonitor.convert(monitor, "Analyzing ...", manifests.size() + 1);
+
+		sub.split(1).beginTask("Initializing", IProgressMonitor.UNKNOWN);
+
+		DependencyAnalysisContext analysisContext = new DependencyAnalysisContext(manifests.keySet());
+
+		// This map is sorted from root to leaves of the dependency tree
+		List<BundleAnalysis> bundles = Iterables2.topoSort(
+				analysisContext.getAnalysisRoots(),
+				BundleAnalysis::partialCompare);
+
+		for (BundleAnalysis bundle : bundles) {
+			IManifestEditor editor = manifests.get(bundle.getManifest());
+
+			SubMonitor step = sub.split(1);
+
+			if (step.isCanceled()) {
+				throw new OperationCanceledException();
+			}
+
+			editor.init();
+			optimizeDependencies(bundle, editor, step);
+		}
+
+		return Status.OK_STATUS;
+	}
+
+	private void optimizeDependencies(BundleAnalysis bundle, IManifestEditor manifest, IProgressMonitor monitor) {
+		monitor.beginTask(bundle.getBundleID(), IProgressMonitor.UNKNOWN);
+		bundle.pushMonitor(monitor);
+
+		try {
+			DependencyGraph graph = bundle.getDependencyGraph();
+			APIExports api = bundle.getAPIExports();
+
+			for (IRequiredBundleDescription requireBundle : manifest.getRequiredBundles()) {
+				String required = requireBundle.getName();
+
+				if (graph.isRedundant(required)) {
+					// Remove it from the manifest
+					manifest.removeRequiredBundle(required);
+
+					// Update the graph
+					graph.removeDependency(required);
+				} else if (api.isExposed(required) && !requireBundle.isExported()) {
+					// We need to retain this dependency and ensure that it is re-exported,
+					// unless it is already re-exported by some other dependency that we re-export
+					// (which would be the redundant case, above)
+					manifest.setRequiredBundleExported(required, true);
+
+					// Update the graph
+					graph.reexport(required);
+				} // else just retain this dependency as is
+			}
+		} finally {
+			bundle.popMonitor();
+		}
+	}
+}