# Guard Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) # Guard ``` interface Guard ``` |--------------------------------------------------------------------------------------------| | [java.security.Guard](https://developer.android.com/reference/kotlin/java/security/Guard#) | |-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Known Direct Subclasses [Permission](https://developer.android.com/reference/kotlin/java/security/Permission) |---------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------| | [Permission](https://developer.android.com/reference/kotlin/java/security/Permission) | Android doesn't support[SecurityManager](https://developer.android.com/reference/kotlin/java/lang/SecurityManager.html#). | | 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| Known Indirect Subclasses [AllPermission](https://developer.android.com/reference/kotlin/java/security/AllPermission),[AuthPermission](https://developer.android.com/reference/kotlin/javax/security/auth/AuthPermission.html#),[BasicPermission](https://developer.android.com/reference/kotlin/java/security/BasicPermission),[FilePermission](https://developer.android.com/reference/kotlin/java/io/FilePermission.html#),[LinkPermission](https://developer.android.com/reference/kotlin/java/nio/file/LinkPermission.html#),[LoggingPermission](https://developer.android.com/reference/kotlin/java/util/logging/LoggingPermission.html#),[NetPermission](https://developer.android.com/reference/kotlin/java/net/NetPermission.html#),[PrivateCredentialPermission](https://developer.android.com/reference/kotlin/javax/security/auth/PrivateCredentialPermission.html#),[PropertyPermission](https://developer.android.com/reference/kotlin/java/util/PropertyPermission.html#),[ReflectPermission](https://developer.android.com/reference/kotlin/java/lang/reflect/ReflectPermission.html#),[RuntimePermission](https://developer.android.com/reference/kotlin/java/lang/RuntimePermission.html#),[SQLPermission](https://developer.android.com/reference/kotlin/java/sql/SQLPermission.html#), and 5 others. |-------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------| | [AllPermission](https://developer.android.com/reference/kotlin/java/security/AllPermission) | Android doesn't support[SecurityManager](https://developer.android.com/reference/kotlin/java/lang/SecurityManager.html#). | | [AuthPermission](https://developer.android.com/reference/kotlin/javax/security/auth/AuthPermission.html#) | Legacy security code; do not use. | | [BasicPermission](https://developer.android.com/reference/kotlin/java/security/BasicPermission) | Android doesn't support[SecurityManager](https://developer.android.com/reference/kotlin/java/lang/SecurityManager.html#). | | [FilePermission](https://developer.android.com/reference/kotlin/java/io/FilePermission.html#) | Legacy security code; do not use. | | [LinkPermission](https://developer.android.com/reference/kotlin/java/nio/file/LinkPermission.html#) | The`Permission`class for link creation operations. | | [LoggingPermission](https://developer.android.com/reference/kotlin/java/util/logging/LoggingPermission.html#) | Legacy security code; do not use. | | [NetPermission](https://developer.android.com/reference/kotlin/java/net/NetPermission.html#) | Legacy security code; do not use. | | [PrivateCredentialPermission](https://developer.android.com/reference/kotlin/javax/security/auth/PrivateCredentialPermission.html#) | Legacy security code; do not use. | | [PropertyPermission](https://developer.android.com/reference/kotlin/java/util/PropertyPermission.html#) | Legacy security code; do not use. | | [ReflectPermission](https://developer.android.com/reference/kotlin/java/lang/reflect/ReflectPermission.html#) | Legacy security code; do not use. | | [RuntimePermission](https://developer.android.com/reference/kotlin/java/lang/RuntimePermission.html#) | Legacy security code; do not use. | | [SQLPermission](https://developer.android.com/reference/kotlin/java/sql/SQLPermission.html#) | Legacy security code; do not use. | | [SSLPermission](https://developer.android.com/reference/kotlin/javax/net/ssl/SSLPermission.html#) | Legacy security code; do not use. | | [SecurityPermission](https://developer.android.com/reference/kotlin/java/security/SecurityPermission) | Legacy security code; do not use. | | [SerializablePermission](https://developer.android.com/reference/kotlin/java/io/SerializablePermission.html#) | This legacy security is not supported on Android. | | [SocketPermission](https://developer.android.com/reference/kotlin/java/net/SocketPermission.html#) | Legacy security code; do not use. | | [UnresolvedPermission](https://developer.android.com/reference/kotlin/java/security/UnresolvedPermission) | Legacy security code; do not use. | | This interface represents a guard, which is an object that is used to protect access to another object. This interface contains a single method,`checkGuard`, with a single`object`argument.`checkGuard`is invoked (by the GuardedObject`getObject`method) to determine whether or not to allow access to the object. ## Summary | Public methods || |--------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | abstract[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [checkGuard](https://developer.android.com/reference/kotlin/java/security/Guard#checkGuard(kotlin.Any))`(`object:` `[Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)!`)` Determines whether or not to allow access to the guarded object`object`. | ## Public methods ### checkGuard Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun checkGuard(object: Any!): Unit ``` Determines whether or not to allow access to the guarded object`object`. Returns silently if access is allowed. Otherwise, throws a SecurityException. | Parameters || |----------|----------------------------------------------------------------------------------------------------------------------| | `object` | [Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)!:the object being protected by the guard. | | Exceptions || |-------------------------------|----------------------| | `java.lang.SecurityException` | if access is denied. |