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/*
* Copyright (c) 2010, 2013, 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
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* published by the Free Software Foundation. Oracle designates this
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
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* 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).
*
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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file, and Oracle licenses the original version of this file under the BSD
* license:
*/
/*
Copyright 2009-2013 Attila Szegedi
Licensed under both the Apache License, Version 2.0 (the "Apache License")
and the BSD License (the "BSD License"), with licensee being free to
choose either of the two at their discretion.
You may not use this file except in compliance with either the Apache
License or the BSD License.
If you choose to use this file in compliance with the Apache License, the
following notice applies to you:
You may obtain a copy of the Apache 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.
If you choose to use this file in compliance with the BSD License, the
following notice applies to you:
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the names of
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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*/
package jdk.internal.dynalink.support;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodHandles.Lookup;
import java.util.Objects;
import jdk.internal.dynalink.CallSiteDescriptor;
/**
* A base class for call site descriptor implementations. Provides reconstruction of the name from the tokens, as well
* as a generally useful {@code equals} and {@code hashCode} methods.
* @author Attila Szegedi
*/
public abstract class AbstractCallSiteDescriptor implements CallSiteDescriptor {
@Override
public String getName() {
return appendName(new StringBuilder(getNameLength())).toString();
}
@Override
public Lookup getLookup() {
return MethodHandles.publicLookup();
}
@Override
public boolean equals(final Object obj) {
return obj instanceof CallSiteDescriptor && equals((CallSiteDescriptor)obj);
}
/**
* Returns true if this call site descriptor is equal to the passed call site descriptor.
* @param csd the other call site descriptor.
* @return true if they are equal.
*/
public boolean equals(final CallSiteDescriptor csd) {
if(csd == null) {
return false;
}
if(csd == this) {
return true;
}
final int ntc = getNameTokenCount();
if(ntc != csd.getNameTokenCount()) {
return false;
}
for(int i = ntc; i-- > 0;) { // Reverse order as variability is higher at the end
if(!Objects.equals(getNameToken(i), csd.getNameToken(i))) {
return false;
}
}
if(!getMethodType().equals(csd.getMethodType())) {
return false;
}
return lookupsEqual(getLookup(), csd.getLookup());
}
@Override
public int hashCode() {
final Lookup lookup = getLookup();
int h = lookup.lookupClass().hashCode() + 31 * lookup.lookupModes();
final int c = getNameTokenCount();
for(int i = 0; i < c; ++i) {
h = h * 31 + getNameToken(i).hashCode();
}
return h * 31 + getMethodType().hashCode();
}
@Override
public String toString() {
final String mt = getMethodType().toString();
final String l = getLookup().toString();
final StringBuilder b = new StringBuilder(l.length() + 1 + mt.length() + getNameLength());
return appendName(b).append(mt).append("@").append(l).toString();
}
private int getNameLength() {
final int c = getNameTokenCount();
int l = 0;
for(int i = 0; i < c; ++i) {
l += getNameToken(i).length();
}
return l + c - 1;
}
private StringBuilder appendName(final StringBuilder b) {
b.append(getNameToken(0));
final int c = getNameTokenCount();
for(int i = 1; i < c; ++i) {
b.append(':').append(getNameToken(i));
}
return b;
}
private static boolean lookupsEqual(final Lookup l1, final Lookup l2) {
if(l1 == l2) {
return true;
}
if(l1.lookupClass() != l2.lookupClass()) {
return false;
}
return l1.lookupModes() == l2.lookupModes();
}
}