JDK 11 java.base.jmod - Base Module

JDK 11 java.base.jmod is the JMOD file for JDK 11 Base module.

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JDK 11 Base module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\java.base.

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java/security/acl/Acl.java

/*
 * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.security.acl;

import java.util.Enumeration;
import java.security.Principal;

/**
 * Interface representing an Access Control List (ACL).  An Access
 * Control List is a data structure used to guard access to
 * resources.<p>
 *
 * An ACL can be thought of as a data structure with multiple ACL
 * entries.  Each ACL entry, of interface type AclEntry, contains a
 * set of permissions associated with a particular principal. (A
 * principal represents an entity such as an individual user or a
 * group). Additionally, each ACL entry is specified as being either
 * positive or negative. If positive, the permissions are to be
 * granted to the associated principal. If negative, the permissions
 * are to be denied.<p>
 *
 * The ACL Entries in each ACL observe the following rules:
 *
 * <ul> <li>Each principal can have at most one positive ACL entry and
 * one negative entry; that is, multiple positive or negative ACL
 * entries are not allowed for any principal.  Each entry specifies
 * the set of permissions that are to be granted (if positive) or
 * denied (if negative).
 *
 * <li>If there is no entry for a particular principal, then the
 * principal is considered to have a null (empty) permission set.
 *
 * <li>If there is a positive entry that grants a principal a
 * particular permission, and a negative entry that denies the
 * principal the same permission, the result is as though the
 * permission was never granted or denied.
 *
 * <li>Individual permissions always override permissions of the
 * group(s) to which the individual belongs. That is, individual
 * negative permissions (specific denial of permissions) override the
 * groups' positive permissions. And individual positive permissions
 * override the groups' negative permissions.
 *
 * </ul>
 *
 * The {@code  java.security.acl } package provides the
 * interfaces to the ACL and related data structures (ACL entries,
 * groups, permissions, etc.).<p>
 *
 * The {@code  java.security.acl.Acl } interface extends the
 * {@code  java.security.acl.Owner } interface. The Owner
 * interface is used to maintain a list of owners for each ACL.  Only
 * owners are allowed to modify an ACL. For example, only an owner can
 * call the ACL's {@code addEntry} method to add a new ACL entry
 * to the ACL.
 *
 * @see java.security.acl.AclEntry
 * @see java.security.acl.Owner
 * @see java.security.acl.Acl#getPermissions
 *
 * @author Satish Dharmaraj
 * @since 1.1
 *
 * @deprecated This class is deprecated and subject to removal in a future
 *     version of Java SE. It has been replaced by {@code java.security.Policy}
 *     and related classes since 1.2.
 */

@Deprecated(since="9", forRemoval=true)
@SuppressWarnings("removal")
public interface Acl extends Owner {

    /**
     * Sets the name of this ACL.
     *
     * @param caller the principal invoking this method. It must be an
     * owner of this ACL.
     *
     * @param name the name to be given to this ACL.
     *
     * @exception NotOwnerException if the caller principal
     * is not an owner of this ACL.
     *
     * @see #getName
     */
    public void setName(Principal caller, String name)
      throws NotOwnerException;

    /**
     * Returns the name of this ACL.
     *
     * @return the name of this ACL.
     *
     * @see #setName
     */
    public String getName();

    /**
     * Adds an ACL entry to this ACL. An entry associates a principal
     * (e.g., an individual or a group) with a set of
     * permissions. Each principal can have at most one positive ACL
     * entry (specifying permissions to be granted to the principal)
     * and one negative ACL entry (specifying permissions to be
     * denied). If there is already an ACL entry of the same type
     * (negative or positive) already in the ACL, false is returned.
     *
     * @param caller the principal invoking this method. It must be an
     * owner of this ACL.
     *
     * @param entry the ACL entry to be added to this ACL.
     *
     * @return true on success, false if an entry of the same type
     * (positive or negative) for the same principal is already
     * present in this ACL.
     *
     * @exception NotOwnerException if the caller principal
     *  is not an owner of this ACL.
     */
    public boolean addEntry(Principal caller, AclEntry entry)
      throws NotOwnerException;

    /**
     * Removes an ACL entry from this ACL.
     *
     * @param caller the principal invoking this method. It must be an
     * owner of this ACL.
     *
     * @param entry the ACL entry to be removed from this ACL.
     *
     * @return true on success, false if the entry is not part of this ACL.
     *
     * @exception NotOwnerException if the caller principal is not
     * an owner of this Acl.
     */
    public boolean removeEntry(Principal caller, AclEntry entry)
          throws NotOwnerException;

    /**
     * Returns an enumeration for the set of allowed permissions for the
     * specified principal (representing an entity such as an individual or
     * a group). This set of allowed permissions is calculated as
     * follows:
     *
     * <ul>
     *
     * <li>If there is no entry in this Access Control List for the
     * specified principal, an empty permission set is returned.
     *
     * <li>Otherwise, the principal's group permission sets are determined.
     * (A principal can belong to one or more groups, where a group is a
     * group of principals, represented by the Group interface.)
     * The group positive permission set is the union of all
     * the positive permissions of each group that the principal belongs to.
     * The group negative permission set is the union of all
     * the negative permissions of each group that the principal belongs to.
     * If there is a specific permission that occurs in both
     * the positive permission set and the negative permission set,
     * it is removed from both.<p>
     *
     * The individual positive and negative permission sets are also
     * determined. The positive permission set contains the permissions
     * specified in the positive ACL entry (if any) for the principal.
     * Similarly, the negative permission set contains the permissions
     * specified in the negative ACL entry (if any) for the principal.
     * The individual positive (or negative) permission set is considered
     * to be null if there is not a positive (negative) ACL entry for the
     * principal in this ACL.<p>
     *
     * The set of permissions granted to the principal is then calculated
     * using the simple rule that individual permissions always override
     * the group permissions. That is, the principal's individual negative
     * permission set (specific denial of permissions) overrides the group
     * positive permission set, and the principal's individual positive
     * permission set overrides the group negative permission set.
     *
     * </ul>
     *
     * @param user the principal whose permission set is to be returned.
     *
     * @return the permission set specifying the permissions the principal
     * is allowed.
     */
    public Enumeration<Permission> getPermissions(Principal user);

    /**
     * Returns an enumeration of the entries in this ACL. Each element in
     * the enumeration is of type AclEntry.
     *
     * @return an enumeration of the entries in this ACL.
     */
    public Enumeration<AclEntry> entries();

    /**
     * Checks whether or not the specified principal has the specified
     * permission. If it does, true is returned, otherwise false is returned.
     *
     * More specifically, this method checks whether the passed permission
     * is a member of the allowed permission set of the specified principal.
     * The allowed permission set is determined by the same algorithm as is
     * used by the {@code getPermissions} method.
     *
     * @param principal the principal, assumed to be a valid authenticated
     * Principal.
     *
     * @param permission the permission to be checked for.
     *
     * @return true if the principal has the specified permission, false
     * otherwise.
     *
     * @see #getPermissions
     */
    public boolean checkPermission(Principal principal, Permission permission);

    /**
     * Returns a string representation of the
     * ACL contents.
     *
     * @return a string representation of the ACL contents.
     */
    public String toString();
}

java/security/acl/Acl.java

 

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Release date: 2018-11-04
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