android-platform-libcore/luni/src/main/java/java/security/AllPermission.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package java.security;


/**
 * {@code AllPermission} represents the permission to perform any operation.
 * Since its {@link #implies(Permission)} method always returns {@code true},
 * granting this permission is equivalent to disabling security.
 */
public final class AllPermission extends Permission {

    /**
     * @serial
     */
    private static final long serialVersionUID = -2916474571451318075L;

    // Permission name
    private static final String ALL_PERMISSIONS = "<all permissions>";

    // Actions name
    private static final String ALL_ACTIONS = "<all actions>";

    /**
     * Constructs a new instance of {@code AllPermission}. The two argument
     * version is provided for class {@code Policy} so that it has a consistent
     * call pattern across all permissions. The name and action list are both
     * ignored.
     *
     * @param name
     *            ignored.
     * @param actions
     *            ignored.
     */
    public AllPermission(String name, String actions) {
        super(ALL_PERMISSIONS);
    }

    /**
     * Constructs a new instance of {@code AllPermission}.
     */
    public AllPermission() {
        super(ALL_PERMISSIONS);
    }

    /**
     * Compares the specified object with this {@code AllPermission} for
     * equality and returns {@code true} if the specified object is equal,
     * {@code false} otherwise. To be equal, the given object needs to be an
     * instance of {@code AllPermission}.
     *
     * @param obj
     *            object to be compared for equality with this {@code
     *            AllPermission}.
     * @return {@code true} if the specified object is equal to this {@code
     *         AllPermission}, otherwise {@code false}.
     * @see #hashCode
     */
    @Override
    public boolean equals(Object obj) {
        return (obj instanceof AllPermission);
    }

    /**
     * Returns the hash code value for this {@code AllPermission}. Returns the
     * same hash code for {@code AllPermission}s that are equal to each other as
     * required by the general contract of {@link Object#hashCode}.
     *
     * @return the hash code value for this {@code AllPermission}.
     * @see Object#equals(Object)
     * @see AllPermission#equals(Object)
     */
    @Override
    public int hashCode() {
        return 1;
    }

    /**
     * Returns the actions associated with this {@code AllPermission}. Since
     * {@code AllPermission} objects allow all actions, this method returns
     * always the string "&lt;all actions&gt;".
     *
     * @return the actions associated with this {@code AllPermission}.
     */
    @Override
    public String getActions() {
        return ALL_ACTIONS;
    }

    /**
     * Indicates whether the given permission is implied by this permission.
     * {@code AllPermission} objects imply all other permissions.
     *
     * @return always {@code true}.
     * @param permission
     *            the permission to check.
     */
    @Override
    public boolean implies(Permission permission) {
        return true;
    }

    /**
     * Returns a new {@code PermissionCollection} for holding permissions of
     * this class.
     *
     * @return a new {@code PermissionCollection}.
     */
    @Override
    public PermissionCollection newPermissionCollection() {
        return new AllPermissionCollection();
    }
}