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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package sun.nio.fs;

import java.nio.file.attribute.*;
import java.io.IOException;
import static sun.nio.fs.UnixNativeDispatcher.*;

Unix implementation of java.nio.file.attribute.UserPrincipal
/** * Unix implementation of java.nio.file.attribute.UserPrincipal */
class UnixUserPrincipals { private static User createSpecial(String name) { return new User(-1, name); } static final User SPECIAL_OWNER = createSpecial("OWNER@"); static final User SPECIAL_GROUP = createSpecial("GROUP@"); static final User SPECIAL_EVERYONE = createSpecial("EVERYONE@"); static class User implements UserPrincipal { private final int id; // uid or gid private final boolean isGroup; private final String name; private User(int id, boolean isGroup, String name) { this.id = id; this.isGroup = isGroup; this.name = name; } User(int id, String name) { this(id, false, name); } int uid() { if (isGroup) throw new AssertionError(); return id; } int gid() { if (isGroup) return id; throw new AssertionError(); } boolean isSpecial() { return id == -1; } @Override public String getName() { return name; } @Override public String toString() { return name; } @Override public boolean equals(Object obj) { if (obj == this) return true; if (!(obj instanceof User)) return false; User other = (User)obj; if ((this.id != other.id) || (this.isGroup != other.isGroup)) { return false; } // specials if (this.id == -1 && other.id == -1) return this.name.equals(other.name); return true; } @Override public int hashCode() { return (id != -1) ? id : name.hashCode(); } } static class Group extends User implements GroupPrincipal { Group(int id, String name) { super(id, true, name); } } // return UserPrincipal representing given uid static User fromUid(int uid) { String name = null; try { name = Util.toString(getpwuid(uid)); } catch (UnixException x) { name = Integer.toString(uid); } return new User(uid, name); } // return GroupPrincipal representing given gid static Group fromGid(int gid) { String name = null; try { name = Util.toString(getgrgid(gid)); } catch (UnixException x) { name = Integer.toString(gid); } return new Group(gid, name); } // lookup user or group name private static int lookupName(String name, boolean isGroup) throws IOException { SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPermission(new RuntimePermission("lookupUserInformation")); } int id = -1; try { id = (isGroup) ? getgrnam(name) : getpwnam(name); } catch (UnixException x) { throw new IOException(name + ": " + x.errorString()); } if (id == -1) { // lookup failed, allow input to be uid or gid try { id = Integer.parseInt(name); } catch (NumberFormatException ignore) { throw new UserPrincipalNotFoundException(name); } } return id; } // lookup user name static UserPrincipal lookupUser(String name) throws IOException { if (name.equals(SPECIAL_OWNER.getName())) return SPECIAL_OWNER; if (name.equals(SPECIAL_GROUP.getName())) return SPECIAL_GROUP; if (name.equals(SPECIAL_EVERYONE.getName())) return SPECIAL_EVERYONE; int uid = lookupName(name, false); return new User(uid, name); } // lookup group name static GroupPrincipal lookupGroup(String group) throws IOException { int gid = lookupName(group, true); return new Group(gid, group); } }