Modifications command between two revisions (#1761)

Adds the option to compute the modifications between two revisions unsing the modifications command.

scm-plugins/scm-svn-plugin/src/main/java/sonia/scm/repository/ConsolidatingModificationCollector.java

@@ -0,0 +1,131 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.repository;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.BiConsumer;
+import java.util.function.BinaryOperator;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Collector;
+
+import static java.util.Collections.emptySet;
+import static java.util.Collections.unmodifiableCollection;
+import static java.util.Collections.unmodifiableSet;
+
+/**
+ * This class can be used to "consolidate" modifications for a stream of commit based modifications.
+ * Single modifications will be changed or ignored if subsequent modifications effect them. An "added"
+ * for a file for example will be ignored, if the same file is marked as "removed" later on. Another
+ * example would be a "modification" of a file, that was "added" beforehand, because in summary this
+ * simply is still an "added" file.
+ */
+class ConsolidatingModificationCollector implements Collector<Modification, ConsolidatedModifications, Collection<Modification>> {
+
+  static ConsolidatingModificationCollector consolidate() {
+    return new ConsolidatingModificationCollector();
+  }
+
+  @Override
+  public Supplier<ConsolidatedModifications> supplier() {
+    return ConsolidatedModifications::new;
+  }
+
+  @Override
+  public BiConsumer<ConsolidatedModifications, Modification> accumulator() {
+    return (existingModifications, currentModification) -> {
+      if (currentModification instanceof Copied) {
+        existingModifications.added(new Added(((Copied) currentModification).getTargetPath()));
+      } else if (currentModification instanceof Removed) {
+        existingModifications.removed((Removed) currentModification);
+      } else if (currentModification instanceof Renamed) {
+        Renamed renameModification = (Renamed) currentModification;
+        existingModifications.removed(new Removed(renameModification.getOldPath()));
+        existingModifications.added(new Added(renameModification.getNewPath()));
+      } else if (currentModification instanceof Added) {
+        existingModifications.added((Added) currentModification);
+      } else if (currentModification instanceof Modified) {
+        existingModifications.modified((Modified) currentModification);
+      } else {
+        throw new IllegalStateException("cannot handle modification of unknown type " + currentModification.getClass());
+      }
+    };
+  }
+
+  @Override
+  public BinaryOperator<ConsolidatedModifications> combiner() {
+    return null; // Combiner not needed because we do not support Collector.Characteristics#CONCURRENT
+  }
+
+  @Override
+  public Function<ConsolidatedModifications, Collection<Modification>> finisher() {
+    return ConsolidatedModifications::getModifications;
+  }
+
+  @Override
+  public Set<Characteristics> characteristics() {
+    return emptySet();
+  }
+}
+
+class ConsolidatedModifications {
+  private final Map<String, Modification> modifications = new HashMap<>();
+
+  Set<String> getPaths() {
+    return unmodifiableSet(modifications.keySet());
+  }
+
+  Collection<Modification> getModifications() {
+    return unmodifiableCollection(modifications.values());
+  }
+
+  void added(Added added) {
+    Modification earlierModification = modifications.get(added.getPath());
+    if (earlierModification instanceof Removed) {
+      modifications.put(added.getPath(), new Modified(added.getPath()));
+    } else {
+      modifications.put(added.getPath(), added);
+    }
+  }
+
+  void modified(Modified modified) {
+    Modification earlierModification = modifications.get(modified.getPath());
+    if (!(earlierModification instanceof Added)) { // added should still be added
+      modified.getEffectedPaths().forEach(path -> modifications.put(path, modified));
+    }
+  }
+
+  void removed(Removed removed) {
+    Modification earlierModification = modifications.get(removed.getPath());
+    if (earlierModification instanceof Added) {
+      modifications.remove(removed.getPath());
+    } else {
+      modifications.put(removed.getPath(), removed);
+    }
+  }
+}

scm-plugins/scm-svn-plugin/src/main/java/sonia/scm/repository/SvnUtil.java

@@ -47,15 +47,17 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
-import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
-import static java.util.Collections.emptyList;
 import static java.util.Optional.empty;
+import static java.util.stream.Collectors.toList;
 import static sonia.scm.ContextEntry.ContextBuilder.entity;
 import static sonia.scm.NotFoundException.notFound;
+import static sonia.scm.repository.ConsolidatingModificationCollector.consolidate;
 
 //~--- JDK imports ------------------------------------------------------------
 
@@ -118,22 +120,29 @@ public final class SvnUtil
     return result;
   }
 
+  public static Modifications createModifications(String startRevision, String endRevision, Collection<SVNLogEntry> entries) {
+    Collection<Modification> consolidatedModifications =
+      entries.stream()
+        .flatMap(SvnUtil::createModificationStream)
+        .collect(consolidate());
+    return new Modifications(startRevision, endRevision, consolidatedModifications);
+  }
 
   public static Modifications createModifications(SVNLogEntry entry, String revision) {
+    return new Modifications(revision, createModificationStream(entry).collect(toList()));
+  }
+
+  private static Stream<Modification> createModificationStream(SVNLogEntry entry) {
     Map<String, SVNLogEntryPath> changeMap = entry.getChangedPaths();
 
-    List<Modification> modificationList;
     if (Util.isNotEmpty(changeMap)) {
-      modificationList = changeMap.values().stream()
+      return changeMap.values().stream()
         .map(e -> asModification(e.getType(), e.getPath()))
         .filter(Optional::isPresent)
-        .map(Optional::get)
-        .collect(Collectors.toList());
+        .map(Optional::get);
     } else {
-      modificationList = emptyList();
+      return Stream.empty();
     }
-
-    return new Modifications(revision, modificationList);
   }
 
   public static Optional<Modification> asModification(char type, String path) {
@@ -383,4 +392,5 @@ public final class SvnUtil
   {
     return Strings.nullToEmpty(id).startsWith(ID_TRANSACTION_PREFIX);
   }
+
 }

scm-plugins/scm-svn-plugin/src/main/java/sonia/scm/repository/spi/SvnModificationsCommand.java

@@ -48,14 +48,12 @@ public class SvnModificationsCommand extends AbstractSvnCommand implements Modif
 
   @Override
   public Modifications getModifications(String revisionOrTransactionId) {
-    Modifications modifications;
     try {
       if (SvnUtil.isTransactionEntryId(revisionOrTransactionId)) {
-        modifications = getModificationsFromTransaction(SvnUtil.getTransactionId(revisionOrTransactionId));
+        return getModificationsFromTransaction(SvnUtil.getTransactionId(revisionOrTransactionId));
       } else {
-        modifications = getModificationFromRevision(revisionOrTransactionId);
+        return getModificationFromRevision(revisionOrTransactionId, revisionOrTransactionId);
       }
-      return modifications;
     } catch (SVNException ex) {
       throw new InternalRepositoryException(
         repository,
@@ -65,15 +63,33 @@ public class SvnModificationsCommand extends AbstractSvnCommand implements Modif
     }
   }
 
+  @Override
+  public Modifications getModifications(String baseRevision, String revision) {
+    try {
+      return getModificationFromRevision(baseRevision, revision);
+    } catch (SVNException ex) {
+      throw new InternalRepositoryException(
+        repository,
+        "failed to get svn modifications from " + baseRevision + " to " + revision,
+        ex
+      );
+    }
+  }
+
   @SuppressWarnings("unchecked")
-  private Modifications getModificationFromRevision(String revision) throws SVNException {
-    log.debug("get svn modifications from revision: {}", revision);
-    long revisionNumber = SvnUtil.getRevisionNumber(revision, repository);
+  private Modifications getModificationFromRevision(String startRevision, String endRevision) throws SVNException {
+    log.debug("get svn modifications from revision {} to {}", startRevision, endRevision);
+    long startRevisionNumber = SvnUtil.getRevisionNumber(startRevision, repository);
+    long endRevisionNumber = SvnUtil.getRevisionNumber(endRevision, repository);
     SVNRepository repo = open();
-    Collection<SVNLogEntry> entries = repo.log(null, null, revisionNumber,
-      revisionNumber, true, true);
+    Collection<SVNLogEntry> entries = repo.log(null, null, startRevisionNumber,
+      endRevisionNumber, true, true);
     if (Util.isNotEmpty(entries)) {
-      return SvnUtil.createModifications(entries.iterator().next(), revision);
+      if (startRevision.equals(endRevision)) {
+        return SvnUtil.createModifications(entries.iterator().next(), endRevision);
+      } else {
+        return SvnUtil.createModifications(startRevision, endRevision, entries);
+      }
     }
     return null;
   }
@@ -87,10 +103,4 @@ public class SvnModificationsCommand extends AbstractSvnCommand implements Modif
 
     return new Modifications(null, modificationList);
   }
-
-  @Override
-  public Modifications getModifications(ModificationsCommandRequest request) {
-    return getModifications(request.getRevision());
-  }
-
 }

scm-plugins/scm-svn-plugin/src/main/java/sonia/scm/repository/spi/SvnRepositoryServiceProvider.java

@@ -26,6 +26,7 @@ package sonia.scm.repository.spi;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.io.Closeables;
+import sonia.scm.repository.Feature;
 import sonia.scm.repository.Repository;
 import sonia.scm.repository.SvnRepositoryHandler;
 import sonia.scm.repository.SvnWorkingCopyFactory;
@@ -34,6 +35,7 @@ import sonia.scm.repository.api.HookContextFactory;
 
 import javax.net.ssl.TrustManager;
 import java.io.IOException;
+import java.util.EnumSet;
 import java.util.Set;
 
 /**
@@ -41,7 +43,6 @@ import java.util.Set;
  */
 public class SvnRepositoryServiceProvider extends RepositoryServiceProvider {
 
-  //J-
   public static final Set<Command> COMMANDS = ImmutableSet.of(
     Command.BLAME,
     Command.BROWSE,
@@ -55,8 +56,10 @@ public class SvnRepositoryServiceProvider extends RepositoryServiceProvider {
     Command.FULL_HEALTH_CHECK,
     Command.MIRROR
   );
-  //J+
 
+  public static final Set<Feature> FEATURES = EnumSet.of(
+    Feature.MODIFICATIONS_BETWEEN_REVISIONS
+  );
 
   private final SvnContext context;
   private final SvnWorkingCopyFactory workingCopyFactory;
@@ -129,6 +132,11 @@ public class SvnRepositoryServiceProvider extends RepositoryServiceProvider {
     return COMMANDS;
   }
 
+  @Override
+  public Set<Feature> getSupportedFeatures() {
+    return FEATURES;
+  }
+
   @Override
   public UnbundleCommand getUnbundleCommand() {
     return new SvnUnbundleCommand(context, hookContextFactory, new SvnLogCommand(context));