diff -r f69a163a9b51 -r 71d383b902e9 jdk/src/share/classes/java/dyn/ConstantCallSite.java --- a/jdk/src/share/classes/java/dyn/ConstantCallSite.java Thu Mar 24 11:20:42 2011 -0700 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,77 +0,0 @@ -/* - * Copyright (c) 2010, 2011, Oracle and/or its affiliates. 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. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -package java.dyn; - -/** - * A {@code ConstantCallSite} is a {@link CallSite} whose target is permanent, and can never be changed. - * An {@code invokedynamic} instruction linked to a {@code ConstantCallSite} is permanently - * bound to the call site's target. - * @author John Rose, JSR 292 EG - */ -public class ConstantCallSite extends CallSite { - /** - * Creates a call site with a permanent target. - * @param target the target to be permanently associated with this call site - * @throws NullPointerException if the proposed target is null - */ - public ConstantCallSite(MethodHandle target) { - super(target); - } - - /** - * Returns the target method of the call site, which behaves - * like a {@code final} field of the {@code ConstantCallSite}. - * That is, the the target is always the original value passed - * to the constructor call which created this instance. - * - * @return the immutable linkage state of this call site, a constant method handle - * @throws UnsupportedOperationException because this kind of call site cannot change its target - */ - @Override public final MethodHandle getTarget() { - return target; - } - - /** - * Always throws an {@link UnsupportedOperationException}. - * This kind of call site cannot change its target. - * @param ignore a new target proposed for the call site, which is ignored - * @throws UnsupportedOperationException because this kind of call site cannot change its target - */ - @Override public final void setTarget(MethodHandle ignore) { - throw new UnsupportedOperationException("ConstantCallSite"); - } - - /** - * Returns this call site's permanent target. - * Since that target will never change, this is a correct implementation - * of {@link CallSite#dynamicInvoker CallSite.dynamicInvoker}. - * @return the immutable linkage state of this call site, a constant method handle - */ - @Override - public final MethodHandle dynamicInvoker() { - return getTarget(); - } -}