1 files changed, 114 insertions, 0 deletions
diff --git a/jimfs/src/main/java/com/google/common/jimfs/UserLookupService.java b/jimfs/src/main/java/com/google/common/jimfs/UserLookupService.java
new file mode 100644
index 0000000..419d71f
--- /dev/null
+++ b/jimfs/src/main/java/com/google/common/jimfs/UserLookupService.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.common.jimfs;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.io.IOException;
+import java.nio.file.attribute.GroupPrincipal;
+import java.nio.file.attribute.UserPrincipal;
+import java.nio.file.attribute.UserPrincipalLookupService;
+import java.nio.file.attribute.UserPrincipalNotFoundException;
+
+/**
+ * {@link UserPrincipalLookupService} implementation.
+ *
+ * @author Colin Decker
+ */
+final class UserLookupService extends UserPrincipalLookupService {
+
+  private final boolean supportsGroups;
+
+  public UserLookupService(boolean supportsGroups) {
+    this.supportsGroups = supportsGroups;
+  }
+
+  @Override
+  public UserPrincipal lookupPrincipalByName(String name) {
+    return createUserPrincipal(name);
+  }
+
+  @Override
+  public GroupPrincipal lookupPrincipalByGroupName(String group) throws IOException {
+    if (!supportsGroups) {
+      throw new UserPrincipalNotFoundException(group); // required by spec
+    }
+    return createGroupPrincipal(group);
+  }
+
+  /** Creates a {@link UserPrincipal} for the given user name. */
+  static UserPrincipal createUserPrincipal(String name) {
+    return new JimfsUserPrincipal(name);
+  }
+
+  /** Creates a {@link GroupPrincipal} for the given group name. */
+  static GroupPrincipal createGroupPrincipal(String name) {
+    return new JimfsGroupPrincipal(name);
+  }
+
+  /** Base class for {@link UserPrincipal} and {@link GroupPrincipal} implementations. */
+  private abstract static class NamedPrincipal implements UserPrincipal {
+
+    protected final String name;
+
+    private NamedPrincipal(String name) {
+      this.name = checkNotNull(name);
+    }
+
+    @Override
+    public final String getName() {
+      return name;
+    }
+
+    @Override
+    public final int hashCode() {
+      return name.hashCode();
+    }
+
+    @Override
+    public final String toString() {
+      return name;
+    }
+  }
+
+  /** {@link UserPrincipal} implementation. */
+  static final class JimfsUserPrincipal extends NamedPrincipal {
+
+    private JimfsUserPrincipal(String name) {
+      super(name);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      return obj instanceof JimfsUserPrincipal
+          && getName().equals(((JimfsUserPrincipal) obj).getName());
+    }
+  }
+
+  /** {@link GroupPrincipal} implementation. */
+  static final class JimfsGroupPrincipal extends NamedPrincipal implements GroupPrincipal {
+
+    private JimfsGroupPrincipal(String name) {
+      super(name);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      return obj instanceof JimfsGroupPrincipal && ((JimfsGroupPrincipal) obj).name.equals(name);
+    }
+  }
+}