1 files changed, 247 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/permissions/FailedPermissionBackend.java b/java/com/google/gerrit/server/permissions/FailedPermissionBackend.java
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+++ b/java/com/google/gerrit/server/permissions/FailedPermissionBackend.java
@@ -0,0 +1,247 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.permissions;
+
+import com.google.gerrit.extensions.api.access.GlobalOrPluginPermission;
+import com.google.gerrit.extensions.conditions.BooleanCondition;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.notedb.ChangeNotes;
+import com.google.gerrit.server.permissions.PermissionBackend.ForChange;
+import com.google.gerrit.server.permissions.PermissionBackend.ForProject;
+import com.google.gerrit.server.permissions.PermissionBackend.ForRef;
+import com.google.gerrit.server.permissions.PermissionBackend.RefFilterOptions;
+import com.google.gerrit.server.permissions.PermissionBackend.WithUser;
+import com.google.gerrit.server.query.change.ChangeData;
+import com.google.inject.Provider;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.Repository;
+
+/**
+ * Helpers for {@link PermissionBackend} that must fail.
+ *
+ * <p>These helpers are useful to curry failure state identified inside a non-throwing factory
+ * method to the throwing {@code check} or {@code test} methods.
+ */
+public class FailedPermissionBackend {
+  public static WithUser user(String message) {
+    return new FailedWithUser(message, null);
+  }
+
+  public static WithUser user(String message, Throwable cause) {
+    return new FailedWithUser(message, cause);
+  }
+
+  public static ForProject project(String message) {
+    return project(message, null);
+  }
+
+  public static ForProject project(String message, Throwable cause) {
+    return new FailedProject(message, cause);
+  }
+
+  public static ForRef ref(String message) {
+    return ref(message, null);
+  }
+
+  public static ForRef ref(String message, Throwable cause) {
+    return new FailedRef(message, cause);
+  }
+
+  public static ForChange change(String message) {
+    return change(message, null);
+  }
+
+  public static ForChange change(String message, Throwable cause) {
+    return new FailedChange(message, cause);
+  }
+
+  private FailedPermissionBackend() {}
+
+  private static class FailedWithUser extends WithUser {
+    private final String message;
+    private final Throwable cause;
+
+    FailedWithUser(String message, Throwable cause) {
+      this.message = message;
+      this.cause = cause;
+    }
+
+    @Override
+    public ForProject project(Project.NameKey project) {
+      return new FailedProject(message, cause);
+    }
+
+    @Override
+    public void check(GlobalOrPluginPermission perm) throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public <T extends GlobalOrPluginPermission> Set<T> test(Collection<T> permSet)
+        throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public BooleanCondition testCond(GlobalOrPluginPermission perm) {
+      throw new UnsupportedOperationException(
+          "FailedPermissionBackend does not support conditions");
+    }
+  }
+
+  private static class FailedProject extends ForProject {
+    private final String message;
+    private final Throwable cause;
+
+    FailedProject(String message, Throwable cause) {
+      this.message = message;
+      this.cause = cause;
+    }
+
+    @Override
+    public ForProject database(Provider<ReviewDb> db) {
+      return this;
+    }
+
+    @Override
+    public String resourcePath() {
+      throw new UnsupportedOperationException(
+          "FailedPermissionBackend is not scoped to a resource");
+    }
+
+    @Override
+    public ForRef ref(String ref) {
+      return new FailedRef(message, cause);
+    }
+
+    @Override
+    public void check(ProjectPermission perm) throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public Set<ProjectPermission> test(Collection<ProjectPermission> permSet)
+        throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public BooleanCondition testCond(ProjectPermission perm) {
+      throw new UnsupportedOperationException(
+          "FailedPermissionBackend does not support conditions");
+    }
+
+    @Override
+    public Map<String, Ref> filter(Map<String, Ref> refs, Repository repo, RefFilterOptions opts)
+        throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+  }
+
+  private static class FailedRef extends ForRef {
+    private final String message;
+    private final Throwable cause;
+
+    FailedRef(String message, Throwable cause) {
+      this.message = message;
+      this.cause = cause;
+    }
+
+    @Override
+    public ForRef database(Provider<ReviewDb> db) {
+      return this;
+    }
+
+    @Override
+    public String resourcePath() {
+      throw new UnsupportedOperationException(
+          "FailedPermissionBackend is not scoped to a resource");
+    }
+
+    @Override
+    public ForChange change(ChangeData cd) {
+      return new FailedChange(message, cause);
+    }
+
+    @Override
+    public ForChange change(ChangeNotes notes) {
+      return new FailedChange(message, cause);
+    }
+
+    @Override
+    public ForChange indexedChange(ChangeData cd, ChangeNotes notes) {
+      return new FailedChange(message, cause);
+    }
+
+    @Override
+    public void check(RefPermission perm) throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public Set<RefPermission> test(Collection<RefPermission> permSet)
+        throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public BooleanCondition testCond(RefPermission perm) {
+      throw new UnsupportedOperationException(
+          "FailedPermissionBackend does not support conditions");
+    }
+  }
+
+  private static class FailedChange extends ForChange {
+    private final String message;
+    private final Throwable cause;
+
+    FailedChange(String message, Throwable cause) {
+      this.message = message;
+      this.cause = cause;
+    }
+
+    @Override
+    public ForChange database(Provider<ReviewDb> db) {
+      return this;
+    }
+
+    @Override
+    public String resourcePath() {
+      throw new UnsupportedOperationException(
+          "FailedPermissionBackend is not scoped to a resource");
+    }
+
+    @Override
+    public void check(ChangePermissionOrLabel perm) throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public <T extends ChangePermissionOrLabel> Set<T> test(Collection<T> permSet)
+        throws PermissionBackendException {
+      throw new PermissionBackendException(message, cause);
+    }
+
+    @Override
+    public BooleanCondition testCond(ChangePermissionOrLabel perm) {
+      throw new UnsupportedOperationException(
+          "FailedPermissionBackend does not support conditions");
+    }
+  }
+}