src/java.base/share/classes/java/security/PolicySpi.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package java.security;

/**
 * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
 * for the {@code Policy} class. Installing a system-wide {@code Policy}
 * object is no longer supported.
 *
 * @since 1.6
 * @deprecated This class was only useful in conjunction with
 *       {@linkplain SecurityManager the Security Manager}, which is no
 *       longer supported. There is no replacement for
 *       the Security Manager or this class.
 */

@Deprecated(since="17", forRemoval=true)
public abstract class PolicySpi {

    /**
     * Constructor.
     */
    public PolicySpi() {}

    /**
     * Check whether the policy has granted a Permission to a ProtectionDomain.
     *
     * @param domain the ProtectionDomain to check
     *
     * @param permission check whether this permission is granted to the
     *          specified domain
     *
     * @return boolean {@code true} if the permission is granted to the domain
     */
    protected abstract boolean engineImplies
        (ProtectionDomain domain, Permission permission);

    /**
     * Refreshes/reloads the policy configuration.
     *
     * <p> The default implementation of this method does nothing.
     */
    protected void engineRefresh() { }

    /**
     * Return a PermissionCollection object containing the set of
     * permissions granted to the specified CodeSource.
     *
     * <p> The default implementation of this method returns
     * Policy.UNSUPPORTED_EMPTY_COLLECTION object.
     *
     * @param codesource the CodeSource to which the returned
     *          PermissionCollection has been granted
     *
     * @return a set of permissions granted to the specified CodeSource
     */
    @SuppressWarnings("removal")
    protected PermissionCollection engineGetPermissions
                                        (CodeSource codesource) {
        return Policy.UNSUPPORTED_EMPTY_COLLECTION;
    }

    /**
     * Return a PermissionCollection object containing the set of
     * permissions granted to the specified ProtectionDomain.
     *
     * <p> The default implementation of this method returns
     * Policy.UNSUPPORTED_EMPTY_COLLECTION object.
     *
     * @param domain the ProtectionDomain to which the returned
     *          PermissionCollection has been granted
     *
     * @return a set of permissions granted to the specified ProtectionDomain
     */
    @SuppressWarnings("removal")
    protected PermissionCollection engineGetPermissions
                                        (ProtectionDomain domain) {
        return Policy.UNSUPPORTED_EMPTY_COLLECTION;
    }
}