Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Migrate `tools/bazel.rc` to `.bazelrc`
  Upgrade bazlets to latest stable-2.15 to build with 2.15.7 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.6 API
  Align Eclipse compiler settings with core Gerrit's
  WORKSPACE: Make commented out lines spaces indent consistent
  bazlets: Replace native.git_repository with skylark rule
  Upgrade bazlets to latest stable-2.15 to build with 2.15.5 API
  Update bazlets to latest stable-2.15 to build with 2.15.4 API
  Replace Guava functional constructs with Java native ones
  Remove final qualifiers
  Fix broken build status badge link
  Allow to protect specific projects against deletion
  Add tests for protected projects

Change-Id: I2aa88b659c17cf643e2914989e1331f67718f595
diff --git a/.settings/org.eclipse.jdt.core.prefs b/.settings/org.eclipse.jdt.core.prefs
index 1792fcc..40e022d 100644
--- a/.settings/org.eclipse.jdt.core.prefs
+++ b/.settings/org.eclipse.jdt.core.prefs
@@ -1,264 +1,126 @@
-#Fri Jul 16 23:39:13 PDT 2010
 eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=disabled
+org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
+org.eclipse.jdt.core.compiler.annotation.nonnull=org.eclipse.jdt.annotation.NonNull
+org.eclipse.jdt.core.compiler.annotation.nonnull.secondary=
+org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annotation.NonNullByDefault
+org.eclipse.jdt.core.compiler.annotation.nonnullbydefault.secondary=
+org.eclipse.jdt.core.compiler.annotation.nullable=org.eclipse.jdt.annotation.Nullable
+org.eclipse.jdt.core.compiler.annotation.nullable.secondary=
+org.eclipse.jdt.core.compiler.annotation.nullanalysis=disabled
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
 org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.doc.comment.support=enabled
+org.eclipse.jdt.core.compiler.problem.APILeak=warning
+org.eclipse.jdt.core.compiler.problem.annotationSuperInterface=ignore
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.autoboxing=ignore
+org.eclipse.jdt.core.compiler.problem.comparingIdentical=warning
+org.eclipse.jdt.core.compiler.problem.deadCode=warning
+org.eclipse.jdt.core.compiler.problem.deprecation=warning
+org.eclipse.jdt.core.compiler.problem.deprecationInDeprecatedCode=disabled
+org.eclipse.jdt.core.compiler.problem.deprecationWhenOverridingDeprecatedMethod=disabled
+org.eclipse.jdt.core.compiler.problem.discouragedReference=warning
+org.eclipse.jdt.core.compiler.problem.emptyStatement=warning
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 org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
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+org.eclipse.jdt.core.compiler.problem.invalidJavadocTags=enabled
+org.eclipse.jdt.core.compiler.problem.invalidJavadocTagsDeprecatedRef=enabled
+org.eclipse.jdt.core.compiler.problem.invalidJavadocTagsNotVisibleRef=enabled
+org.eclipse.jdt.core.compiler.problem.invalidJavadocTagsVisibility=private
+org.eclipse.jdt.core.compiler.problem.localVariableHiding=ignore
+org.eclipse.jdt.core.compiler.problem.methodWithConstructorName=warning
+org.eclipse.jdt.core.compiler.problem.missingDefaultCase=ignore
+org.eclipse.jdt.core.compiler.problem.missingDeprecatedAnnotation=ignore
+org.eclipse.jdt.core.compiler.problem.missingEnumCaseDespiteDefault=enabled
+org.eclipse.jdt.core.compiler.problem.missingHashCodeMethod=warning
+org.eclipse.jdt.core.compiler.problem.missingJavadocComments=ignore
+org.eclipse.jdt.core.compiler.problem.missingJavadocCommentsOverriding=disabled
+org.eclipse.jdt.core.compiler.problem.missingJavadocCommentsVisibility=public
+org.eclipse.jdt.core.compiler.problem.missingJavadocTagDescription=return_tag
+org.eclipse.jdt.core.compiler.problem.missingJavadocTags=ignore
+org.eclipse.jdt.core.compiler.problem.missingJavadocTagsMethodTypeParameters=disabled
+org.eclipse.jdt.core.compiler.problem.missingJavadocTagsOverriding=disabled
+org.eclipse.jdt.core.compiler.problem.missingJavadocTagsVisibility=protected
+org.eclipse.jdt.core.compiler.problem.missingOverrideAnnotation=warning
+org.eclipse.jdt.core.compiler.problem.missingOverrideAnnotationForInterfaceMethodImplementation=enabled
+org.eclipse.jdt.core.compiler.problem.missingSerialVersion=warning
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+org.eclipse.jdt.core.compiler.problem.specialParameterHidingField=disabled
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+org.eclipse.jdt.core.compiler.problem.unavoidableGenericTypeProblems=enabled
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+org.eclipse.jdt.core.compiler.problem.unlikelyCollectionMethodArgumentType=warning
+org.eclipse.jdt.core.compiler.problem.unlikelyCollectionMethodArgumentTypeStrict=disabled
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+org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionExemptExceptionAndThrowable=enabled
+org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionIncludeDocCommentReference=enabled
+org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionWhenOverriding=disabled
+org.eclipse.jdt.core.compiler.problem.unusedExceptionParameter=ignore
+org.eclipse.jdt.core.compiler.problem.unusedImport=warning
+org.eclipse.jdt.core.compiler.problem.unusedLabel=warning
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+org.eclipse.jdt.core.compiler.problem.unusedParameter=warning
+org.eclipse.jdt.core.compiler.problem.unusedParameterIncludeDocCommentReference=enabled
+org.eclipse.jdt.core.compiler.problem.unusedParameterWhenImplementingAbstract=disabled
+org.eclipse.jdt.core.compiler.problem.unusedParameterWhenOverridingConcrete=disabled
+org.eclipse.jdt.core.compiler.problem.unusedPrivateMember=warning
+org.eclipse.jdt.core.compiler.problem.unusedTypeParameter=ignore
+org.eclipse.jdt.core.compiler.problem.unusedWarningToken=warning
+org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=warning
+org.eclipse.jdt.core.compiler.processAnnotations=enabled
 org.eclipse.jdt.core.compiler.source=1.8
-org.eclipse.jdt.core.formatter.align_type_members_on_columns=false
-org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression=16
-org.eclipse.jdt.core.formatter.alignment_for_arguments_in_enum_constant=16
-org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call=16
-org.eclipse.jdt.core.formatter.alignment_for_arguments_in_method_invocation=16
-org.eclipse.jdt.core.formatter.alignment_for_arguments_in_qualified_allocation_expression=16
-org.eclipse.jdt.core.formatter.alignment_for_assignment=16
-org.eclipse.jdt.core.formatter.alignment_for_binary_expression=16
-org.eclipse.jdt.core.formatter.alignment_for_compact_if=16
-org.eclipse.jdt.core.formatter.alignment_for_conditional_expression=16
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-org.eclipse.jdt.core.formatter.alignment_for_expressions_in_array_initializer=16
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-org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_method_declaration=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_method_invocation=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_parenthesized_expression=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_switch=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_synchronized=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_while=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_colon_in_assert=insert
-org.eclipse.jdt.core.formatter.insert_space_before_colon_in_case=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_colon_in_conditional=insert
-org.eclipse.jdt.core.formatter.insert_space_before_colon_in_default=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_colon_in_for=insert
-org.eclipse.jdt.core.formatter.insert_space_before_colon_in_labeled_statement=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_allocation_expression=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_annotation=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_array_initializer=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_constructor_declaration_parameters=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_constructor_declaration_throws=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_enum_constant_arguments=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_enum_declarations=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_explicitconstructorcall_arguments=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_for_increments=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_for_inits=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_method_declaration_parameters=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_method_declaration_throws=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_method_invocation_arguments=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_multiple_field_declarations=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_multiple_local_declarations=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_parameterized_type_reference=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_superinterfaces=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_type_arguments=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_comma_in_type_parameters=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_ellipsis=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_angle_bracket_in_parameterized_type_reference=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_angle_bracket_in_type_arguments=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_angle_bracket_in_type_parameters=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_annotation_type_declaration=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_anonymous_type_declaration=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_array_initializer=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_block=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_constructor_declaration=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_enum_constant=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_enum_declaration=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_method_declaration=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_switch=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_type_declaration=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_allocation_expression=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_reference=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_type_reference=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_annotation=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_annotation_type_member_declaration=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_catch=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_constructor_declaration=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_enum_constant=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_for=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_if=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_declaration=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_invocation=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_parenthesized_expression=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_switch=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_synchronized=insert
-org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_while=insert
-org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_return=insert
-org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_throw=insert
-org.eclipse.jdt.core.formatter.insert_space_before_postfix_operator=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_prefix_operator=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_question_in_conditional=insert
-org.eclipse.jdt.core.formatter.insert_space_before_question_in_wildcard=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_semicolon=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_for=do not insert
-org.eclipse.jdt.core.formatter.insert_space_before_unary_operator=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_brackets_in_array_type_reference=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_empty_braces_in_array_initializer=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_empty_brackets_in_array_allocation_expression=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_annotation_type_member_declaration=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_constructor_declaration=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_enum_constant=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_declaration=do not insert
-org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_invocation=do not insert
-org.eclipse.jdt.core.formatter.join_lines_in_comments=true
-org.eclipse.jdt.core.formatter.join_wrapped_lines=true
-org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line=false
-org.eclipse.jdt.core.formatter.keep_empty_array_initializer_on_one_line=false
-org.eclipse.jdt.core.formatter.keep_imple_if_on_one_line=true
-org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line=false
-org.eclipse.jdt.core.formatter.lineSplit=80
-org.eclipse.jdt.core.formatter.never_indent_block_comments_on_first_column=false
-org.eclipse.jdt.core.formatter.never_indent_line_comments_on_first_column=false
-org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body=0
-org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve=3
-org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line=false
-org.eclipse.jdt.core.formatter.tabulation.char=space
-org.eclipse.jdt.core.formatter.tabulation.size=2
-org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations=false
-org.eclipse.jdt.core.formatter.wrap_before_binary_operator=true
diff --git a/README.md b/README.md
index 92bea1f..1444d1a 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,5 @@
 A plugin which allows projects to be deleted from Gerrit via an SSH command,
 REST API or the Project settings screen.
 
-[![Build Status](https://gerrit-ci.gerritforge.com/job/plugin-delete-project-bazel-master/badge/icon)
+[![Build Status](https://gerrit-ci.gerritforge.com/view/Plugins-master/job/plugin-delete-project-bazel-master/badge/icon
+)](https://gerrit-ci.gerritforge.com/view/Plugins-master/job/plugin-delete-project-bazel-master/)
diff --git a/WORKSPACE b/WORKSPACE
index 5e343eb..4cdbf86 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -4,7 +4,7 @@
 
 load_bazlets(
     commit = "e4662688b3f482cf5789b27a1ea726e8d0aabfc8",
-    #    local_path = "/home/<user>/projects/bazlets",
+    #local_path = "/home/<user>/projects/bazlets",
 )
 
 # Polymer dependencies
@@ -33,7 +33,7 @@
     repository = GERRIT,
 )
 
-#Snapshot Plugin API
+# Snapshot Plugin API
 #load(
 #    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
 #    "gerrit_api_maven_local",
diff --git a/bazlets.bzl b/bazlets.bzl
index f97b72c..f089af4 100644
--- a/bazlets.bzl
+++ b/bazlets.bzl
@@ -1,10 +1,12 @@
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
+
 NAME = "com_googlesource_gerrit_bazlets"
 
 def load_bazlets(
         commit,
         local_path = None):
     if not local_path:
-        native.git_repository(
+        git_repository(
             name = NAME,
             remote = "https://gerrit.googlesource.com/bazlets",
             commit = commit,
diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/Configuration.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/Configuration.java
index be7186d..cd11508 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/Configuration.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/Configuration.java
@@ -14,11 +14,16 @@
 
 package com.googlesource.gerrit.plugins.deleteproject;
 
+import static java.util.stream.Collectors.toList;
+
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.server.config.PluginConfig;
 import com.google.gerrit.server.config.PluginConfigFactory;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
+import java.util.Arrays;
+import java.util.List;
+import java.util.regex.Pattern;
 
 @Singleton
 public class Configuration {
@@ -27,6 +32,7 @@
   private final boolean allowDeletionWithTags;
   private final boolean hideProjectOnPreserve;
   private final String deletedProjectsParent;
+  private final List<Pattern> protectedProjects;
 
   @Inject
   public Configuration(PluginConfigFactory pluginConfigFactory, @PluginName String pluginName) {
@@ -34,6 +40,11 @@
     allowDeletionWithTags = cfg.getBoolean("allowDeletionOfReposWithTags", true);
     hideProjectOnPreserve = cfg.getBoolean("hideProjectOnPreserve", false);
     deletedProjectsParent = cfg.getString("parentForDeletedProjects", DELETED_PROJECTS_PARENT);
+    protectedProjects =
+        Arrays.asList(cfg.getStringList("protectedProject"))
+            .stream()
+            .map(Pattern::compile)
+            .collect(toList());
   }
 
   public boolean deletionWithTagsAllowed() {
@@ -47,4 +58,8 @@
   public String getDeletedProjectsParent() {
     return deletedProjectsParent;
   }
+
+  public List<Pattern> protectedProjects() {
+    return protectedProjects;
+  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/ProtectedProjects.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/ProtectedProjects.java
index 7074149..c1e697d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/ProtectedProjects.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/ProtectedProjects.java
@@ -14,6 +14,7 @@
 
 package com.googlesource.gerrit.plugins.deleteproject;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.config.AllProjectsName;
 import com.google.gerrit.server.config.AllProjectsNameProvider;
@@ -27,18 +28,31 @@
 public class ProtectedProjects {
   private final AllProjectsName allProjectsName;
   private final AllUsersName allUsersName;
+  private final Configuration config;
 
   @Inject
   ProtectedProjects(
-      AllProjectsNameProvider allProjectsNameProvider, AllUsersNameProvider allUsersNameProvider) {
+      AllProjectsNameProvider allProjectsNameProvider,
+      AllUsersNameProvider allUsersNameProvider,
+      Configuration config) {
     this.allProjectsName = allProjectsNameProvider.get();
     this.allUsersName = allUsersNameProvider.get();
+    this.config = config;
   }
 
-  public boolean isProtected(Project.NameKey name) {
+  private boolean isDefaultProtected(Project.NameKey name) {
     return name.equals(allProjectsName) || name.equals(allUsersName);
   }
 
+  private boolean isCustomProtected(Project.NameKey name) {
+    return config.protectedProjects().stream().anyMatch(p -> p.matcher(name.get()).matches());
+  }
+
+  @VisibleForTesting
+  public boolean isProtected(Project.NameKey name) {
+    return isDefaultProtected(name) || isCustomProtected(name);
+  }
+
   public boolean isProtected(ProjectResource rsrc) {
     return isProtected(rsrc.getNameKey());
   }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/database/DatabaseDeleteHandler.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/database/DatabaseDeleteHandler.java
index ca1ed10..5db7fe5 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/database/DatabaseDeleteHandler.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/database/DatabaseDeleteHandler.java
@@ -151,7 +151,7 @@
     }
   }
 
-  private final void deleteChanges(ReviewDb db, Project.NameKey project, List<Change.Id> changeIds)
+  private void deleteChanges(ReviewDb db, Project.NameKey project, List<Change.Id> changeIds)
       throws OrmException {
 
     for (Change.Id id : changeIds) {
@@ -181,8 +181,7 @@
     }
   }
 
-  private final void deleteFromPatchSets(ReviewDb db, final ResultSet<PatchSet> patchSets)
-      throws OrmException {
+  private void deleteFromPatchSets(ReviewDb db, ResultSet<PatchSet> patchSets) throws OrmException {
     for (PatchSet patchSet : patchSets) {
       accountPatchReviewStore.get().clearReviewed(patchSet.getId());
       db.patchSets().delete(Collections.singleton(patchSet));
diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java
index 837ad6f..31ee0e8 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java
@@ -14,9 +14,8 @@
 
 package com.googlesource.gerrit.plugins.deleteproject.projectconfig;
 
-import com.google.common.base.Function;
-import com.google.common.base.Joiner;
-import com.google.common.collect.Iterables;
+import static java.util.stream.Collectors.joining;
+
 import com.google.gerrit.extensions.common.ProjectInfo;
 import com.google.gerrit.extensions.restapi.ResourceConflictException;
 import com.google.gerrit.server.permissions.PermissionBackendException;
@@ -51,19 +50,9 @@
     try {
       List<ProjectInfo> children = listChildProjectsProvider.get().apply(rsrc);
       if (!children.isEmpty()) {
-        String childrenString =
-            Joiner.on(", ")
-                .join(
-                    Iterables.transform(
-                        children,
-                        new Function<ProjectInfo, String>() {
-                          @Override
-                          public String apply(ProjectInfo info) {
-                            return info.name;
-                          }
-                        }));
         throw new CannotDeleteProjectException(
-            "Cannot delete project because it has children: " + childrenString);
+            "Cannot delete project because it has children: "
+                + children.stream().map(info -> info.name).collect(joining(",")));
       }
     } catch (PermissionBackendException e) {
       throw new CannotDeleteProjectException(
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index cbb1719..65f996d 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -43,3 +43,13 @@
 	is set to true.
 
 	By default `Deleted-Projects`.
+
+<a id="protectedProject">
+`plugin.@PLUGIN@.protectedProject`
+:	The name of a project that is protected against deletion. May be an exact
+	name or a regular expression.
+
+	May be specified more than once to specify multiple project names or
+	patterns.
+
+	By default not set.
diff --git a/src/test/java/com/googlesource/gerrit/plugins/deleteproject/ProtectedProjectsTest.java b/src/test/java/com/googlesource/gerrit/plugins/deleteproject/ProtectedProjectsTest.java
new file mode 100644
index 0000000..9133f64
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/deleteproject/ProtectedProjectsTest.java
@@ -0,0 +1,99 @@
+// Copyright (C) 2018 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.googlesource.gerrit.plugins.deleteproject;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.when;
+
+import com.google.common.collect.ImmutableList;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.server.config.AllProjectsName;
+import com.google.gerrit.server.config.AllProjectsNameProvider;
+import com.google.gerrit.server.config.AllUsersName;
+import com.google.gerrit.server.config.AllUsersNameProvider;
+import com.google.gerrit.server.config.PluginConfig;
+import com.google.gerrit.server.config.PluginConfigFactory;
+import java.util.List;
+import org.eclipse.jgit.lib.Config;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class ProtectedProjectsTest {
+  private static final String PLUGIN_NAME = "delete-project";
+
+  @Mock private AllProjectsNameProvider allProjectsMock;
+  @Mock private AllUsersNameProvider allUsersMock;
+  @Mock private PluginConfigFactory pluginConfigFactoryMock;
+
+  private PluginConfig pluginConfig;
+  private Configuration deleteConfig;
+  private ProtectedProjects protectedProjects;
+
+  @Before
+  public void setup() throws Exception {
+    when(allProjectsMock.get()).thenReturn(new AllProjectsName("All-Projects"));
+    when(allUsersMock.get()).thenReturn(new AllUsersName("All-Users"));
+    pluginConfig = new PluginConfig(PLUGIN_NAME, new Config());
+    when(pluginConfigFactoryMock.getFromGerritConfig(PLUGIN_NAME)).thenReturn(pluginConfig);
+    deleteConfig = new Configuration(pluginConfigFactoryMock, PLUGIN_NAME);
+    protectedProjects = new ProtectedProjects(allProjectsMock, allUsersMock, deleteConfig);
+  }
+
+  @Test
+  public void allProjectsIsProtected() throws Exception {
+    assertProtected("All-Projects");
+  }
+
+  @Test
+  public void allUsersIsProtected() throws Exception {
+    assertProtected("All-Users");
+  }
+
+  @Test
+  public void otherProjectIsNotProtected() throws Exception {
+    assertNotProtected("test-project");
+  }
+
+  @Test
+  public void customProjectIsProtected() throws Exception {
+    List<String> projects = ImmutableList.of("Custom-Parent", "^protected-.*");
+    pluginConfig.setStringList("protectedProject", projects);
+    when(pluginConfigFactoryMock.getFromGerritConfig(PLUGIN_NAME)).thenReturn(pluginConfig);
+    deleteConfig = new Configuration(pluginConfigFactoryMock, PLUGIN_NAME);
+    assertThat(deleteConfig.protectedProjects()).hasSize(projects.size());
+    protectedProjects = new ProtectedProjects(allProjectsMock, allUsersMock, deleteConfig);
+
+    assertProtected("protected-project-1");
+    assertProtected("protected-project-2");
+    assertProtected("Custom-Parent");
+    assertNotProtected("test-project");
+    assertNotProtected("protected");
+    assertNotProtected("my-protected-project");
+    assertNotProtected("Another-Custom-Parent");
+    assertNotProtected("Custom-Parent-2");
+  }
+
+  private void assertProtected(String name) {
+    assertThat(protectedProjects.isProtected(new Project.NameKey(name))).isTrue();
+  }
+
+  private void assertNotProtected(String name) {
+    assertThat(protectedProjects.isProtected(new Project.NameKey(name))).isFalse();
+  }
+}