1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/jdk/internal/dynalink/support/AbstractCallSiteDescriptor.java Thu Feb 14 13:22:26 2013 +0100
1.3 @@ -0,0 +1,186 @@
1.4 +/*
1.5 + * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +/*
1.30 + * This file is available under and governed by the GNU General Public
1.31 + * License version 2 only, as published by the Free Software Foundation.
1.32 + * However, the following notice accompanied the original version of this
1.33 + * file, and Oracle licenses the original version of this file under the BSD
1.34 + * license:
1.35 + */
1.36 +/*
1.37 + Copyright 2009-2013 Attila Szegedi
1.38 +
1.39 + Licensed under both the Apache License, Version 2.0 (the "Apache License")
1.40 + and the BSD License (the "BSD License"), with licensee being free to
1.41 + choose either of the two at their discretion.
1.42 +
1.43 + You may not use this file except in compliance with either the Apache
1.44 + License or the BSD License.
1.45 +
1.46 + If you choose to use this file in compliance with the Apache License, the
1.47 + following notice applies to you:
1.48 +
1.49 + You may obtain a copy of the Apache License at
1.50 +
1.51 + http://www.apache.org/licenses/LICENSE-2.0
1.52 +
1.53 + Unless required by applicable law or agreed to in writing, software
1.54 + distributed under the License is distributed on an "AS IS" BASIS,
1.55 + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
1.56 + implied. See the License for the specific language governing
1.57 + permissions and limitations under the License.
1.58 +
1.59 + If you choose to use this file in compliance with the BSD License, the
1.60 + following notice applies to you:
1.61 +
1.62 + Redistribution and use in source and binary forms, with or without
1.63 + modification, are permitted provided that the following conditions are
1.64 + met:
1.65 + * Redistributions of source code must retain the above copyright
1.66 + notice, this list of conditions and the following disclaimer.
1.67 + * Redistributions in binary form must reproduce the above copyright
1.68 + notice, this list of conditions and the following disclaimer in the
1.69 + documentation and/or other materials provided with the distribution.
1.70 + * Neither the name of the copyright holder nor the names of
1.71 + contributors may be used to endorse or promote products derived from
1.72 + this software without specific prior written permission.
1.73 +
1.74 + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.75 + IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.76 + TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
1.77 + PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
1.78 + BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.79 + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.80 + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
1.81 + BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
1.82 + WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
1.83 + OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
1.84 + ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.85 +*/
1.86 +
1.87 +package jdk.internal.dynalink.support;
1.88 +
1.89 +import java.lang.invoke.MethodHandles;
1.90 +import java.lang.invoke.MethodHandles.Lookup;
1.91 +import java.util.Objects;
1.92 +import jdk.internal.dynalink.CallSiteDescriptor;
1.93 +
1.94 +
1.95 +/**
1.96 + * A base class for call site descriptor implementations. Provides reconstruction of the name from the tokens, as well
1.97 + * as a generally useful {@code equals} and {@code hashCode} methods.
1.98 + * @author Attila Szegedi
1.99 + */
1.100 +public abstract class AbstractCallSiteDescriptor implements CallSiteDescriptor {
1.101 +
1.102 + @Override
1.103 + public String getName() {
1.104 + return appendName(new StringBuilder(getNameLength())).toString();
1.105 + }
1.106 +
1.107 + @Override
1.108 + public Lookup getLookup() {
1.109 + return MethodHandles.publicLookup();
1.110 + }
1.111 +
1.112 + @Override
1.113 + public boolean equals(Object obj) {
1.114 + return obj instanceof CallSiteDescriptor && equals((CallSiteDescriptor)obj);
1.115 + }
1.116 +
1.117 + /**
1.118 + * Returns true if this call site descriptor is equal to the passed call site descriptor.
1.119 + * @param csd the other call site descriptor.
1.120 + * @return true if they are equal.
1.121 + */
1.122 + public boolean equals(CallSiteDescriptor csd) {
1.123 + if(csd == null) {
1.124 + return false;
1.125 + }
1.126 + if(csd == this) {
1.127 + return true;
1.128 + }
1.129 + final int ntc = getNameTokenCount();
1.130 + if(ntc != csd.getNameTokenCount()) {
1.131 + return false;
1.132 + }
1.133 + for(int i = ntc; i-- > 0;) { // Reverse order as variability is higher at the end
1.134 + if(!Objects.equals(getNameToken(i), csd.getNameToken(i))) {
1.135 + return false;
1.136 + }
1.137 + }
1.138 + if(!getMethodType().equals(csd.getMethodType())) {
1.139 + return false;
1.140 + }
1.141 + return lookupsEqual(getLookup(), csd.getLookup());
1.142 + }
1.143 +
1.144 + @Override
1.145 + public int hashCode() {
1.146 + final int c = getNameTokenCount();
1.147 + int h = 0;
1.148 + for(int i = 0; i < c; ++i) {
1.149 + h = h * 31 + getNameToken(i).hashCode();
1.150 + }
1.151 + return h * 31 + getMethodType().hashCode();
1.152 + }
1.153 +
1.154 + @Override
1.155 + public String toString() {
1.156 + final String mt = getMethodType().toString();
1.157 + final String l = getLookup().toString();
1.158 + final StringBuilder b = new StringBuilder(l.length() + 1 + mt.length() + getNameLength());
1.159 + return appendName(b).append(mt).append("@").append(l).toString();
1.160 + }
1.161 +
1.162 + private int getNameLength() {
1.163 + final int c = getNameTokenCount();
1.164 + int l = 0;
1.165 + for(int i = 0; i < c; ++i) {
1.166 + l += getNameToken(i).length();
1.167 + }
1.168 + return l + c - 1;
1.169 + }
1.170 +
1.171 + private StringBuilder appendName(StringBuilder b) {
1.172 + b.append(getNameToken(0));
1.173 + final int c = getNameTokenCount();
1.174 + for(int i = 1; i < c; ++i) {
1.175 + b.append(':').append(getNameToken(i));
1.176 + }
1.177 + return b;
1.178 + }
1.179 +
1.180 + private static boolean lookupsEqual(Lookup l1, Lookup l2) {
1.181 + if(l1 == l2) {
1.182 + return true;
1.183 + }
1.184 + if(l1.lookupClass() != l2.lookupClass()) {
1.185 + return false;
1.186 + }
1.187 + return l1.lookupModes() == l2.lookupModes();
1.188 + }
1.189 +}
