author | alanb |
Thu, 22 Dec 2011 10:52:17 +0000 | |
changeset 11358 | 8821bb789678 |
parent 9035 | 1255eb81cc2f |
child 18574 | 4aeaeb541678 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.nio.file.attribute; |
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import java.util.*; |
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|
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/** |
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* An entry in an access control list (ACL). |
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* |
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* <p> The ACL entry represented by this class is based on the ACL model |
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* specified in <a href="http://www.ietf.org/rfc/rfc3530.txt"><i>RFC 3530: |
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* Network File System (NFS) version 4 Protocol</i></a>. Each entry has four |
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* components as follows: |
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* |
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* <ol> |
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* <li><p> The {@link #type() type} component determines if the entry |
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* grants or denies access. </p></li> |
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* |
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* <li><p> The {@link #principal() principal} component, sometimes called the |
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* "who" component, is a {@link UserPrincipal} corresponding to the identity |
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* that the entry grants or denies access |
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* </p></li> |
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* |
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* <li><p> The {@link #permissions permissions} component is a set of |
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* {@link AclEntryPermission permissions} |
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* </p></li> |
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* |
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* <li><p> The {@link #flags flags} component is a set of {@link AclEntryFlag |
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* flags} to indicate how entries are inherited and propagated </p></li> |
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* </ol> |
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* |
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* <p> ACL entries are created using an associated {@link Builder} object by |
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* invoking its {@link Builder#build build} method. |
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* |
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* <p> ACL entries are immutable and are safe for use by multiple concurrent |
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* threads. |
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* |
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* @since 1.7 |
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*/ |
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public final class AclEntry { |
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private final AclEntryType type; |
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private final UserPrincipal who; |
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private final Set<AclEntryPermission> perms; |
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private final Set<AclEntryFlag> flags; |
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// cached hash code |
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private volatile int hash; |
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// private constructor |
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private AclEntry(AclEntryType type, |
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UserPrincipal who, |
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Set<AclEntryPermission> perms, |
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Set<AclEntryFlag> flags) |
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{ |
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this.type = type; |
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this.who = who; |
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this.perms = perms; |
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this.flags = flags; |
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} |
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/** |
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* A builder of {@link AclEntry} objects. |
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* |
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* <p> A {@code Builder} object is obtained by invoking one of the {@link |
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* AclEntry#newBuilder newBuilder} methods defined by the {@code AclEntry} |
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* class. |
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* |
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* <p> Builder objects are mutable and are not safe for use by multiple |
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* concurrent threads without appropriate synchronization. |
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* |
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* @since 1.7 |
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*/ |
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public static final class Builder { |
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private AclEntryType type; |
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private UserPrincipal who; |
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private Set<AclEntryPermission> perms; |
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private Set<AclEntryFlag> flags; |
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private Builder(AclEntryType type, |
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UserPrincipal who, |
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Set<AclEntryPermission> perms, |
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Set<AclEntryFlag> flags) |
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{ |
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assert perms != null && flags != null; |
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this.type = type; |
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this.who = who; |
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this.perms = perms; |
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this.flags = flags; |
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} |
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/** |
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* Constructs an {@link AclEntry} from the components of this builder. |
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* The type and who components are required to have been set in order |
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* to construct an {@code AclEntry}. |
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* |
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* @return a new ACL entry |
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* |
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* @throws IllegalStateException |
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* if the type or who component have not been set |
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*/ |
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public AclEntry build() { |
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if (type == null) |
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throw new IllegalStateException("Missing type component"); |
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if (who == null) |
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throw new IllegalStateException("Missing who component"); |
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return new AclEntry(type, who, perms, flags); |
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} |
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|
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/** |
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* Sets the type component of this builder. |
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* |
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* @return this builder |
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*/ |
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public Builder setType(AclEntryType type) { |
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if (type == null) |
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throw new NullPointerException(); |
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this.type = type; |
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return this; |
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} |
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|
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/** |
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* Sets the principal component of this builder. |
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* |
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* @return this builder |
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*/ |
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public Builder setPrincipal(UserPrincipal who) { |
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if (who == null) |
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throw new NullPointerException(); |
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this.who = who; |
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return this; |
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} |
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|
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// check set only contains elements of the given type |
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private static void checkSet(Set<?> set, Class<?> type) { |
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for (Object e: set) { |
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if (e == null) |
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throw new NullPointerException(); |
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type.cast(e); |
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} |
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} |
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|
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167 |
/** |
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* Sets the permissions component of this builder. On return, the |
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* permissions component of this builder is a copy of the given set. |
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* |
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* @return this builder |
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* |
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* @throws ClassCastException |
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* if the set contains elements that are not of type {@code |
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* AclEntryPermission} |
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*/ |
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public Builder setPermissions(Set<AclEntryPermission> perms) { |
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if (perms.isEmpty()) { |
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// EnumSet.copyOf does not allow empty set |
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perms = Collections.emptySet(); |
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} else { |
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// copy and check for erroneous elements |
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perms = EnumSet.copyOf(perms); |
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checkSet(perms, AclEntryPermission.class); |
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} |
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this.perms = perms; |
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return this; |
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189 |
} |
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190 |
|
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191 |
/** |
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* Sets the permissions component of this builder. On return, the |
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* permissions component of this builder is a copy of the permissions in |
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* the given array. |
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* |
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* @return this builder |
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*/ |
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public Builder setPermissions(AclEntryPermission... perms) { |
8158 | 199 |
Set<AclEntryPermission> set = EnumSet.noneOf(AclEntryPermission.class); |
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// copy and check for null elements |
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for (AclEntryPermission p: perms) { |
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if (p == null) |
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203 |
throw new NullPointerException(); |
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set.add(p); |
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} |
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this.perms = set; |
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return this; |
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} |
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209 |
|
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210 |
/** |
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* Sets the flags component of this builder. On return, the flags |
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* component of this builder is a copy of the given set. |
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* |
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* @return this builder |
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* |
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* @throws ClassCastException |
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* if the set contains elements that are not of type {@code |
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* AclEntryFlag} |
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*/ |
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public Builder setFlags(Set<AclEntryFlag> flags) { |
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if (flags.isEmpty()) { |
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// EnumSet.copyOf does not allow empty set |
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flags = Collections.emptySet(); |
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} else { |
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// copy and check for erroneous elements |
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flags = EnumSet.copyOf(flags); |
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checkSet(flags, AclEntryFlag.class); |
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} |
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|
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this.flags = flags; |
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return this; |
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232 |
} |
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233 |
|
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234 |
/** |
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235 |
* Sets the flags component of this builder. On return, the flags |
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* component of this builder is a copy of the flags in the given |
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* array. |
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* |
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* @return this builder |
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*/ |
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public Builder setFlags(AclEntryFlag... flags) { |
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Set<AclEntryFlag> set = EnumSet.noneOf(AclEntryFlag.class); |
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// copy and check for null elements |
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for (AclEntryFlag f: flags) { |
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if (f == null) |
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throw new NullPointerException(); |
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set.add(f); |
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} |
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this.flags = set; |
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return this; |
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} |
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} |
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|
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/** |
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* Constructs a new builder. The initial value of the type and who |
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* components is {@code null}. The initial value of the permissions and |
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* flags components is the empty set. |
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* |
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* @return a new builder |
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*/ |
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public static Builder newBuilder() { |
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Set<AclEntryPermission> perms = Collections.emptySet(); |
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Set<AclEntryFlag> flags = Collections.emptySet(); |
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return new Builder(null, null, perms, flags); |
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} |
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|
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/** |
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* Constructs a new builder with the components of an existing ACL entry. |
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* |
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* @param entry |
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* an ACL entry |
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* |
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* @return a new builder |
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*/ |
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public static Builder newBuilder(AclEntry entry) { |
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return new Builder(entry.type, entry.who, entry.perms, entry.flags); |
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} |
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|
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/** |
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* Returns the ACL entry type. |
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*/ |
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public AclEntryType type() { |
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return type; |
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} |
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|
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/** |
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* Returns the principal component. |
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*/ |
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public UserPrincipal principal() { |
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return who; |
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} |
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|
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293 |
/** |
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* Returns a copy of the permissions component. |
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* |
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* <p> The returned set is a modifiable copy of the permissions. |
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*/ |
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public Set<AclEntryPermission> permissions() { |
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return new HashSet<AclEntryPermission>(perms); |
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} |
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|
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/** |
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* Returns a copy of the flags component. |
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* |
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* <p> The returned set is a modifiable copy of the flags. |
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*/ |
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public Set<AclEntryFlag> flags() { |
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return new HashSet<AclEntryFlag>(flags); |
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} |
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|
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311 |
/** |
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* Compares the specified object with this ACL entry for equality. |
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* |
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* <p> If the given object is not an {@code AclEntry} then this method |
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* immediately returns {@code false}. |
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* |
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* <p> For two ACL entries to be considered equals requires that they are |
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* both the same type, their who components are equal, their permissions |
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* components are equal, and their flags components are equal. |
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* |
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321 |
* <p> This method satisfies the general contract of the {@link |
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* java.lang.Object#equals(Object) Object.equals} method. </p> |
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* |
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* @param ob the object to which this object is to be compared |
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* |
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* @return {@code true} if, and only if, the given object is an AclEntry that |
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* is identical to this AclEntry |
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*/ |
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@Override |
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public boolean equals(Object ob) { |
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if (ob == this) |
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return true; |
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if (ob == null || !(ob instanceof AclEntry)) |
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return false; |
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AclEntry other = (AclEntry)ob; |
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if (this.type != other.type) |
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return false; |
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if (!this.who.equals(other.who)) |
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return false; |
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if (!this.perms.equals(other.perms)) |
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return false; |
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if (!this.flags.equals(other.flags)) |
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return false; |
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return true; |
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345 |
} |
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346 |
|
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347 |
private static int hash(int h, Object o) { |
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return h * 127 + o.hashCode(); |
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} |
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350 |
|
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351 |
/** |
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352 |
* Returns the hash-code value for this ACL entry. |
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353 |
* |
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354 |
* <p> This method satisfies the general contract of the {@link |
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* Object#hashCode} method. |
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356 |
*/ |
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357 |
@Override |
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358 |
public int hashCode() { |
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359 |
// return cached hash if available |
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360 |
if (hash != 0) |
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361 |
return hash; |
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362 |
int h = type.hashCode(); |
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363 |
h = hash(h, who); |
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364 |
h = hash(h, perms); |
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365 |
h = hash(h, flags); |
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366 |
hash = h; |
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|
367 |
return hash; |
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368 |
} |
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|
369 |
|
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370 |
/** |
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371 |
* Returns the string representation of this ACL entry. |
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372 |
* |
2072
80dfe4469bbd
6809132: (file) Javadoc style and consistency issues
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2057
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|
373 |
* @return the string representation of this entry |
2057
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374 |
*/ |
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375 |
@Override |
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|
376 |
public String toString() { |
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|
377 |
StringBuilder sb = new StringBuilder(); |
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|
378 |
|
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|
379 |
// who |
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|
380 |
sb.append(who.getName()); |
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changeset
|
381 |
sb.append(':'); |
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changeset
|
382 |
|
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|
383 |
// permissions |
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|
384 |
for (AclEntryPermission perm: perms) { |
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|
385 |
sb.append(perm.name()); |
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changeset
|
386 |
sb.append('/'); |
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|
387 |
} |
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|
388 |
sb.setLength(sb.length()-1); // drop final slash |
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changeset
|
389 |
sb.append(':'); |
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parents:
diff
changeset
|
390 |
|
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parents:
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changeset
|
391 |
// flags |
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|
392 |
if (!flags.isEmpty()) { |
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changeset
|
393 |
for (AclEntryFlag flag: flags) { |
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6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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changeset
|
394 |
sb.append(flag.name()); |
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6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
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changeset
|
395 |
sb.append('/'); |
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parents:
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changeset
|
396 |
} |
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changeset
|
397 |
sb.setLength(sb.length()-1); // drop final slash |
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6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
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changeset
|
398 |
sb.append(':'); |
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parents:
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|
399 |
} |
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|
400 |
|
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parents:
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changeset
|
401 |
// type |
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parents:
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changeset
|
402 |
sb.append(type.name()); |
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parents:
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changeset
|
403 |
return sb.toString(); |
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parents:
diff
changeset
|
404 |
} |
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changeset
|
405 |
} |