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package java.nio.file;

import java.security.BasicPermission;

The Permission class for link creation operations. 
 The following table provides a summary description of what the permission
allows, and discusses the risks of granting code the permission.

Table shows permission target name, what the permission allows, and associated risks


Permission Target Name
What the Permission Allows
Risks of Allowing this Permission




  
hard
  
 Ability to add an existing file to a directory. This is sometimes
  known as creating a link, or hard link. 
  
 Extreme care should be taken when granting this permission. It allows
  linking to any file or directory in the file system thus allowing the
  attacker access to all files. 


  
symbolic
  
 Ability to create symbolic links. 
  
 Extreme care should be taken when granting this permission. It allows
  linking to any file or directory in the file system thus allowing the
  attacker to access to all files. 



See Also:
Files.createLink
Files.createSymbolicLink
Since:
1.7/**
 * The {@code Permission} class for link creation operations.
 *
 * <p> The following table provides a summary description of what the permission
 * allows, and discusses the risks of granting code the permission.
 *
 * <table class="striped">
 * <caption style="display:none">Table shows permission target name, what the permission allows, and associated risks</caption>
 * <thead>
 * <tr>
 * <th scope="col">Permission Target Name</th>
 * <th scope="col">What the Permission Allows</th>
 * <th scope="col">Risks of Allowing this Permission</th>
 * </tr>
 * </thead>
 * <tbody>
 * <tr>
 *   <th scope="row">hard</th>
 *   <td> Ability to add an existing file to a directory. This is sometimes
 *   known as creating a link, or hard link. </td>
 *   <td> Extreme care should be taken when granting this permission. It allows
 *   linking to any file or directory in the file system thus allowing the
 *   attacker access to all files. </td>
 * </tr>
 * <tr>
 *   <th scope="row">symbolic</th>
 *   <td> Ability to create symbolic links. </td>
 *   <td> Extreme care should be taken when granting this permission. It allows
 *   linking to any file or directory in the file system thus allowing the
 *   attacker to access to all files. </td>
 * </tr>
 * </tbody>
 * </table>
 *
 * @since 1.7
 *
 * @see Files#createLink
 * @see Files#createSymbolicLink
 */
public final class LinkPermission extends BasicPermission {
    static final long serialVersionUID = -1441492453772213220L;

    private void checkName(String name) {
        if (!name.equals("hard") && !name.equals("symbolic")) {
            throw new IllegalArgumentException("name: " + name);
        }
    }

    
Constructs a LinkPermission with the specified name. 
Params:
name – 
         the name of the permission. It must be "hard" or "symbolic".
Throws:
IllegalArgumentException – 
         if name is empty or invalid/**
     * Constructs a {@code LinkPermission} with the specified name.
     *
     * @param   name
     *          the name of the permission. It must be "hard" or "symbolic".
     *
     * @throws  IllegalArgumentException
     *          if name is empty or invalid
     */
    public LinkPermission(String name) {
        super(name);
        checkName(name);
    }

    
Constructs a LinkPermission with the specified name. 
Params:
name – 
         the name of the permission; must be "hard" or "symbolic".
actions –  the actions for the permission; must be the empty string or null
Throws:
IllegalArgumentException – 
         if name is empty or invalid, or actions is a non-empty string/**
     * Constructs a {@code LinkPermission} with the specified name.
     *
     * @param   name
     *          the name of the permission; must be "hard" or "symbolic".
     * @param   actions
     *          the actions for the permission; must be the empty string or
     *          {@code null}
     *
     * @throws  IllegalArgumentException
     *          if name is empty or invalid, or actions is a non-empty string
     */
    public LinkPermission(String name, String actions) {
        super(name);
        checkName(name);
        if (actions != null && !actions.isEmpty()) {
            throw new IllegalArgumentException("actions: " + actions);
        }
    }
}