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/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed 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 leap.lang.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * Immutable
 * 
 * The class to which this annotation is applied is immutable. This means that
 * its state cannot be seen to change by callers. Of necessity this means that
 * all public fields are final, and that all public final reference fields refer
 * to other immutable objects, and that methods do not publish references to any
 * internal state which is mutable by implementation even if not by design.
 * Immutable objects may still have internal mutable state for purposes of
 * performance optimization; some state variables may be lazily computed, so
 * long as they are computed from immutable state and that callers cannot tell
 * the difference.
 * 
 * Immutable objects are inherently thread-safe; they may be passed between
 * threads or published without synchronization.
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface Immutable {
	
}