jaxws/src/share/classes/com/sun/istack/internal/Interned.java

/*
 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package com.sun.istack.internal;

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

/**
 * Designates that a field, return value, argument, or a variable is supposed
 * to be an {@link String#intern() interned} string.
 *
 * <p>
 * In many places in the istack, we assume Strings to be interned for
 * the performance reason. Similarly, In many other places, we don't
 * make such an assumption for the performance reason (because intern
 * isn't free.)
 *
 * <p>
 * Therefore, distinguishing which part is supposed to be interned and
 * which part is supposed to be not is important. This annotation
 * allows us to capture that in the code.
 *
 * @author Kohsuke Kawaguchi
 */
@Documented
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.FIELD,ElementType.METHOD,ElementType.PARAMETER,ElementType.LOCAL_VARIABLE})
public @interface Interned {
}