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comparison: mobile/android/thirdparty/ch/boye/httpclientandroidlib/annotation/Immutable.java
mobile/android/thirdparty/ch/boye/httpclientandroidlib/annotation/Immutable.java
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| -1:000000000000 | 0:fae2e850f887 |
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| 1 /* | |
| 2 * ==================================================================== | |
| 3 * | |
| 4 * Licensed to the Apache Software Foundation (ASF) under one or more | |
| 5 * contributor license agreements. See the NOTICE file distributed with | |
| 6 * this work for additional information regarding copyright ownership. | |
| 7 * The ASF licenses this file to You under the Apache License, Version 2.0 | |
| 8 * (the "License"); you may not use this file except in compliance with | |
| 9 * the License. You may obtain a copy of the License at | |
| 10 * | |
| 11 * http://www.apache.org/licenses/LICENSE-2.0 | |
| 12 * | |
| 13 * Unless required by applicable law or agreed to in writing, software | |
| 14 * distributed under the License is distributed on an "AS IS" BASIS, | |
| 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 16 * See the License for the specific language governing permissions and | |
| 17 * limitations under the License. | |
| 18 * ==================================================================== | |
| 19 * | |
| 20 * This software consists of voluntary contributions made by many | |
| 21 * individuals on behalf of the Apache Software Foundation. For more | |
| 22 * information on the Apache Software Foundation, please see | |
| 23 * <http://www.apache.org/>. | |
| 24 * | |
| 25 */ | |
| 26 package ch.boye.httpclientandroidlib.annotation; | |
| 27 | |
| 28 import java.lang.annotation.Documented; | |
| 29 import java.lang.annotation.ElementType; | |
| 30 import java.lang.annotation.Retention; | |
| 31 import java.lang.annotation.RetentionPolicy; | |
| 32 import java.lang.annotation.Target; | |
| 33 | |
| 34 /** | |
| 35 * The class to which this annotation is applied is immutable. This means that | |
| 36 * its state cannot be seen to change by callers, which implies that | |
| 37 * <ul> | |
| 38 * <li> all public fields are final, </li> | |
| 39 * <li> all public final reference fields refer to other immutable objects, and </li> | |
| 40 * <li> constructors and methods do not publish references to any internal state | |
| 41 * which is potentially mutable by the implementation. </li> | |
| 42 * </ul> | |
| 43 * Immutable objects may still have internal mutable state for purposes of performance | |
| 44 * optimization; some state variables may be lazily computed, so long as they are computed | |
| 45 * from immutable state and that callers cannot tell the difference. | |
| 46 * <p> | |
| 47 * Immutable objects are inherently thread-safe; they may be passed between threads or | |
| 48 * published without synchronization. | |
| 49 * <p> | |
| 50 * Based on code developed by Brian Goetz and Tim Peierls and concepts | |
| 51 * published in 'Java Concurrency in Practice' by Brian Goetz, Tim Peierls, | |
| 52 * Joshua Bloch, Joseph Bowbeer, David Holmes and Doug Lea. | |
| 53 */ | |
| 54 @Documented | |
| 55 @Target(ElementType.TYPE) | |
| 56 @Retention(RetentionPolicy.CLASS) // The original version used RUNTIME | |
| 57 public @interface Immutable { | |
| 58 } |
