attila@90: /*
attila@90:  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
attila@90:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
attila@90:  *
attila@90:  * This code is free software; you can redistribute it and/or modify it
attila@90:  * under the terms of the GNU General Public License version 2 only, as
attila@90:  * published by the Free Software Foundation.  Oracle designates this
attila@90:  * particular file as subject to the "Classpath" exception as provided
attila@90:  * by Oracle in the LICENSE file that accompanied this code.
attila@90:  *
attila@90:  * This code is distributed in the hope that it will be useful, but WITHOUT
attila@90:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
attila@90:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
attila@90:  * version 2 for more details (a copy is included in the LICENSE file that
attila@90:  * accompanied this code).
attila@90:  *
attila@90:  * You should have received a copy of the GNU General Public License version
attila@90:  * 2 along with this work; if not, write to the Free Software Foundation,
attila@90:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
attila@90:  *
attila@90:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
attila@90:  * or visit www.oracle.com if you need additional information or have any
attila@90:  * questions.
attila@90:  */
attila@90: 
attila@90: /*
attila@90:  * This file is available under and governed by the GNU General Public
attila@90:  * License version 2 only, as published by the Free Software Foundation.
attila@90:  * However, the following notice accompanied the original version of this
attila@90:  * file, and Oracle licenses the original version of this file under the BSD
attila@90:  * license:
attila@90:  */
attila@90: /*
attila@90:    Copyright 2009-2013 Attila Szegedi
attila@90: 
attila@90:    Licensed under both the Apache License, Version 2.0 (the "Apache License")
attila@90:    and the BSD License (the "BSD License"), with licensee being free to
attila@90:    choose either of the two at their discretion.
attila@90: 
attila@90:    You may not use this file except in compliance with either the Apache
attila@90:    License or the BSD License.
attila@90: 
attila@90:    If you choose to use this file in compliance with the Apache License, the
attila@90:    following notice applies to you:
attila@90: 
attila@90:        You may obtain a copy of the Apache License at
attila@90: 
attila@90:            http://www.apache.org/licenses/LICENSE-2.0
attila@90: 
attila@90:        Unless required by applicable law or agreed to in writing, software
attila@90:        distributed under the License is distributed on an "AS IS" BASIS,
attila@90:        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
attila@90:        implied. See the License for the specific language governing
attila@90:        permissions and limitations under the License.
attila@90: 
attila@90:    If you choose to use this file in compliance with the BSD License, the
attila@90:    following notice applies to you:
attila@90: 
attila@90:        Redistribution and use in source and binary forms, with or without
attila@90:        modification, are permitted provided that the following conditions are
attila@90:        met:
attila@90:        * Redistributions of source code must retain the above copyright
attila@90:          notice, this list of conditions and the following disclaimer.
attila@90:        * Redistributions in binary form must reproduce the above copyright
attila@90:          notice, this list of conditions and the following disclaimer in the
attila@90:          documentation and/or other materials provided with the distribution.
attila@90:        * Neither the name of the copyright holder nor the names of
attila@90:          contributors may be used to endorse or promote products derived from
attila@90:          this software without specific prior written permission.
attila@90: 
attila@90:        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
attila@90:        IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
attila@90:        TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
attila@90:        PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
attila@90:        BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
attila@90:        CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
attila@90:        SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
attila@90:        BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
attila@90:        WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
attila@90:        OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
attila@90:        ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
attila@90: */
attila@90: 
attila@90: package jdk.internal.dynalink.support;
attila@90: 
attila@90: import java.lang.invoke.MethodHandles;
attila@90: import java.lang.invoke.MethodHandles.Lookup;
attila@90: import java.util.Objects;
attila@90: import jdk.internal.dynalink.CallSiteDescriptor;
attila@90: 
attila@90: 
attila@90: /**
attila@90:  * A base class for call site descriptor implementations. Provides reconstruction of the name from the tokens, as well
attila@90:  * as a generally useful {@code equals} and {@code hashCode} methods.
attila@90:  * @author Attila Szegedi
attila@90:  */
attila@90: public abstract class AbstractCallSiteDescriptor implements CallSiteDescriptor {
attila@90: 
attila@90:     @Override
attila@90:     public String getName() {
attila@90:         return appendName(new StringBuilder(getNameLength())).toString();
attila@90:     }
attila@90: 
attila@90:    @Override
attila@90:    public Lookup getLookup() {
attila@90:        return MethodHandles.publicLookup();
attila@90:    }
attila@90: 
attila@90:     @Override
attila@90:     public boolean equals(Object obj) {
attila@90:         return obj instanceof CallSiteDescriptor && equals((CallSiteDescriptor)obj);
attila@90:     }
attila@90: 
attila@90:     /**
attila@90:      * Returns true if this call site descriptor is equal to the passed call site descriptor.
attila@90:      * @param csd the other call site descriptor.
attila@90:      * @return true if they are equal.
attila@90:      */
attila@90:     public boolean equals(CallSiteDescriptor csd) {
attila@90:         if(csd == null) {
attila@90:             return false;
attila@90:         }
attila@90:         if(csd == this) {
attila@90:             return true;
attila@90:         }
attila@90:         final int ntc = getNameTokenCount();
attila@90:         if(ntc != csd.getNameTokenCount()) {
attila@90:             return false;
attila@90:         }
attila@90:         for(int i = ntc; i-- > 0;) { // Reverse order as variability is higher at the end
attila@90:             if(!Objects.equals(getNameToken(i), csd.getNameToken(i))) {
attila@90:                 return false;
attila@90:             }
attila@90:         }
attila@90:         if(!getMethodType().equals(csd.getMethodType())) {
attila@90:             return false;
attila@90:         }
attila@90:         return lookupsEqual(getLookup(), csd.getLookup());
attila@90:     }
attila@90: 
attila@90:     @Override
attila@90:     public int hashCode() {
attila@90:         final int c = getNameTokenCount();
attila@90:         int h = 0;
attila@90:         for(int i = 0; i < c; ++i) {
attila@90:             h = h * 31 + getNameToken(i).hashCode();
attila@90:         }
attila@90:         return h * 31 + getMethodType().hashCode();
attila@90:     }
attila@90: 
attila@90:     @Override
attila@90:     public String toString() {
attila@90:         final String mt = getMethodType().toString();
attila@90:         final String l = getLookup().toString();
attila@90:         final StringBuilder b = new StringBuilder(l.length() + 1 + mt.length() + getNameLength());
attila@90:         return appendName(b).append(mt).append("@").append(l).toString();
attila@90:     }
attila@90: 
attila@90:     private int getNameLength() {
attila@90:         final int c = getNameTokenCount();
attila@90:         int l = 0;
attila@90:         for(int i = 0; i < c; ++i) {
attila@90:             l += getNameToken(i).length();
attila@90:         }
attila@90:         return l +  c - 1;
attila@90:     }
attila@90: 
attila@90:     private StringBuilder appendName(StringBuilder b) {
attila@90:         b.append(getNameToken(0));
attila@90:         final int c = getNameTokenCount();
attila@90:         for(int i = 1; i < c; ++i) {
attila@90:             b.append(':').append(getNameToken(i));
attila@90:         }
attila@90:         return b;
attila@90:     }
attila@90: 
attila@90:     private static boolean lookupsEqual(Lookup l1, Lookup l2) {
attila@90:         if(l1 == l2) {
attila@90:             return true;
attila@90:         }
attila@90:         if(l1.lookupClass() != l2.lookupClass()) {
attila@90:             return false;
attila@90:         }
attila@90:         return l1.lookupModes() == l2.lookupModes();
attila@90:     }
attila@90: }