diff options
Diffstat (limited to 'luni/src/main/java/java/security/GuardedObject.java')
-rw-r--r-- | luni/src/main/java/java/security/GuardedObject.java | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/luni/src/main/java/java/security/GuardedObject.java b/luni/src/main/java/java/security/GuardedObject.java new file mode 100644 index 0000000..34a5113 --- /dev/null +++ b/luni/src/main/java/java/security/GuardedObject.java @@ -0,0 +1,76 @@ +/* + * 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; + +import java.io.IOException; +import java.io.Serializable; + +/** + * {@code GuardedObject} controls access to an object, by checking all requests + * for the object with a {@code Guard}. + */ +public class GuardedObject implements Serializable { + + private static final long serialVersionUID = -5240450096227834308L; + + private final Object object; + + private final Guard guard; + + /** + * Constructs a new instance of {@code GuardedObject} which protects access + * to the specified {@code Object} using the specified {@code Guard}. + * + * @param object + * the {@code Object} to protect. + * @param guard + * the {@code Guard} which protects the specified {@code Object}, + * maybe {@code null}. + */ + public GuardedObject(Object object, Guard guard) { + this.object = object; + this.guard = guard; + } + + /** + * Returns the guarded {@code Object} if the associated {@code Guard} + * permits access. If access is not granted, then a {@code + * SecurityException} is thrown. + * + * @return the guarded object. + * @exception SecurityException + * if access is not granted to the guarded object. + */ + public Object getObject() throws SecurityException { + if (guard != null) { + guard.checkGuard(object); + } + return object; + } + + /** + * Checks the guard (if there is one) before performing a default + * serialization. + */ + private void writeObject(java.io.ObjectOutputStream out) throws IOException { + if (guard != null) { + guard.checkGuard(object); + } + out.defaultWriteObject(); + } +} |