1 files changed, 73 insertions, 0 deletions
diff --git a/sonar-scanner-engine/src/main/java/org/sonar/scanner/scm/ScmChangedFilesProvider.java b/sonar-scanner-engine/src/main/java/org/sonar/scanner/scm/ScmChangedFilesProvider.java
new file mode 100644
index 00000000000..60b87a1fc0a
--- /dev/null
+++ b/sonar-scanner-engine/src/main/java/org/sonar/scanner/scm/ScmChangedFilesProvider.java
@@ -0,0 +1,73 @@
+/*
+ * SonarQube
+ * Copyright (C) 2009-2017 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.scanner.scm;
+
+import java.nio.file.Path;
+import java.util.Collection;
+import javax.annotation.CheckForNull;
+import org.picocontainer.annotations.Nullable;
+import org.picocontainer.injectors.ProviderAdapter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.sonar.api.batch.fs.internal.InputModuleHierarchy;
+import org.sonar.api.batch.scm.ScmBranchProvider;
+import org.sonar.api.batch.scm.ScmProvider;
+import org.sonar.scanner.scan.branch.BranchConfiguration;
+
+public class ScmChangedFilesProvider extends ProviderAdapter {
+  private static final Logger LOG = LoggerFactory.getLogger(ScmChangedFilesProvider.class);
+
+  private ScmChangedFiles scmBranchChangedFiles;
+
+  /*
+   * ScmConfiguration is not available in issues mode
+   */
+  public ScmChangedFiles provide(@Nullable ScmConfiguration scmConfiguration, BranchConfiguration branchConfiguration, InputModuleHierarchy inputModuleHierarchy) {
+    if (scmBranchChangedFiles == null) {
+      if (scmConfiguration == null) {
+        scmBranchChangedFiles = new ScmChangedFiles(null);
+      } else {
+        Path rootBaseDir = inputModuleHierarchy.root().getBaseDir();
+        Collection<Path> changedFiles = loadChangedFilesIfNeeded(scmConfiguration, branchConfiguration, rootBaseDir);
+        scmBranchChangedFiles = new ScmChangedFiles(changedFiles);
+      }
+    }
+    return scmBranchChangedFiles;
+  }
+
+  @CheckForNull
+  private static Collection<Path> loadChangedFilesIfNeeded(ScmConfiguration scmConfiguration, BranchConfiguration branchConfiguration, Path rootBaseDir) {
+    if (branchConfiguration.isShortLivingBranch()) {
+      ScmProvider scmProvider = scmConfiguration.provider();
+      if (scmProvider != null && (scmProvider instanceof ScmBranchProvider)) {
+        ScmBranchProvider scmBranchProvider = (ScmBranchProvider) scmProvider;
+        Collection<Path> changedFiles = scmBranchProvider.branchChangedFiles(branchConfiguration.branchTarget(), rootBaseDir);
+        if (changedFiles != null) {
+          LOG.debug("SCM reported {} files changed in the branch", changedFiles.size());
+          return changedFiles;
+        }
+      }
+
+      LOG.debug("SCM information about changed files in the branch is not available");
+    }
+    return null;
+  }
+
+}