author | attila |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink.support; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.MethodHandles.Lookup; |
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import java.util.Objects; |
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import jdk.internal.dynalink.CallSiteDescriptor; |
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/** |
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* A base class for call site descriptor implementations. Provides |
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* reconstruction of the name from the tokens, as well as generally useful |
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* {@code equals}, {@code hashCode}, and {@code toString} methods. In order to |
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* both prevent unprivileged access to its internal {@link MethodHandles.Lookup} |
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* object, and at the same time not force privileged access to it from |
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* {@code equals}, {@code hashCode}, and {@code toString} methods, subclasses |
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* must implement {@link #lookupEquals(AbstractCallSiteDescriptor)}, |
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* {@link #lookupHashCode()} and {@link #lookupToString()} methods. |
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* Additionally, {@link #equalsInKind(AbstractCallSiteDescriptor)} should be |
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* overridden instead of {@link #equals(Object)} to compare descriptors in |
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* subclasses; it is only necessary if they have implementation-specific |
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* properties other than the standard name, type, and lookup. |
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* @param <T> The call site descriptor subclass |
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*/ |
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public abstract class AbstractCallSiteDescriptor<T extends AbstractCallSiteDescriptor<T>> implements CallSiteDescriptor { |
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@Override |
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public String getName() { |
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return appendName(new StringBuilder(getNameLength())).toString(); |
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} |
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/** |
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* Checks if this call site descriptor is equality to another object. It is |
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* considered equal iff and only if they belong to the exact same class, and |
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* have the same name, method type, and lookup. Subclasses with additional |
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* properties should override |
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* {@link #equalsInKind(AbstractCallSiteDescriptor)} instead of this method. |
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* @param obj the object checked for equality |
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* @return true if they are equal, false otherwise |
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*/ |
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@SuppressWarnings("unchecked") |
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@Override |
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public boolean equals(final Object obj) { |
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return obj != null && obj.getClass() == getClass() && equalsInKind((T)obj); |
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} |
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/** |
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* Returns true if this call site descriptor is equal to the passed, |
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* non-null call site descriptor of the same class. |
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* @param csd the other call site descriptor. |
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* @return true if they are equal. |
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*/ |
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protected boolean equalsInKind(final T csd) { |
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if(csd == this) { |
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return true; |
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} |
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final int ntc = getNameTokenCount(); |
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if(ntc != csd.getNameTokenCount()) { |
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return false; |
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} |
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for(int i = ntc; i-- > 0;) { // Reverse order as variability is higher at the end |
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if(!Objects.equals(getNameToken(i), csd.getNameToken(i))) { |
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return false; |
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} |
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} |
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if(!getMethodType().equals(csd.getMethodType())) { |
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return false; |
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} |
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return lookupEquals(csd); |
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} |
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|
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/** |
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* Returns true if this call site descriptor's lookup is equal to the other |
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* call site descriptor's lookup. Typical implementation should try to |
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* obtain the other lookup directly without going through privileged |
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* {@link #getLookup()} (e.g. by reading the field as the type system |
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* enforces that they are of the same class) and then delegate to |
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* {@link #lookupsEqual(MethodHandles.Lookup, MethodHandles.Lookup)}. |
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* @param other the other lookup |
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* @return true if the lookups are equal |
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*/ |
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protected abstract boolean lookupEquals(T other); |
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|
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/** |
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* Compares two lookup objects for value-based equality. They are considered |
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* equal if they have the same |
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* {@link java.lang.invoke.MethodHandles.Lookup#lookupClass()} and |
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* {@link java.lang.invoke.MethodHandles.Lookup#lookupModes()}. |
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* @param l1 first lookup |
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* @param l2 second lookup |
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* @return true if the two lookups are equal, false otherwise. |
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*/ |
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protected static boolean lookupsEqual(final Lookup l1, final Lookup l2) { |
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if(l1 == l2) { |
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return true; |
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} else if (l1 == null || l2 == null) { |
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return false; |
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} else if(l1.lookupClass() != l2.lookupClass()) { |
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return false; |
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} |
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return l1.lookupModes() == l2.lookupModes(); |
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} |
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|
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@Override |
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public int hashCode() { |
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int h = lookupHashCode(); |
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final int c = getNameTokenCount(); |
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for(int i = 0; i < c; ++i) { |
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h = h * 31 + getNameToken(i).hashCode(); |
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} |
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return h * 31 + getMethodType().hashCode(); |
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} |
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|
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/** |
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* Return the hash code of this call site descriptor's {@link Lookup} |
197 |
* object. Typical implementation should delegate to |
|
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* {@link #lookupHashCode(MethodHandles.Lookup)}. |
|
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* @return the hash code of this call site descriptor's {@link Lookup} |
|
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* object. |
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*/ |
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protected abstract int lookupHashCode(); |
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|
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/** |
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* Returns a value-based hash code for the passed lookup object. It is |
|
206 |
* based on the lookup object's |
|
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* {@link java.lang.invoke.MethodHandles.Lookup#lookupClass()} and |
|
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* {@link java.lang.invoke.MethodHandles.Lookup#lookupModes()} values. |
|
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* @param lookup the lookup object. |
|
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* @return a hash code for the object. Returns 0 for null. |
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*/ |
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protected static int lookupHashCode(final Lookup lookup) { |
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return lookup != null ? lookup.lookupClass().hashCode() + 31 * lookup.lookupModes() : 0; |
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} |
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@Override |
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public String toString() { |
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final String mt = getMethodType().toString(); |
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final String l = lookupToString(); |
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final StringBuilder b = new StringBuilder(l.length() + 1 + mt.length() + getNameLength()); |
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return appendName(b).append(mt).append("@").append(l).toString(); |
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} |
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|
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/** |
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* Return a string representation of this call site descriptor's |
226 |
* {@link Lookup} object. Typically will return |
|
227 |
* {@link java.lang.invoke.MethodHandles.Lookup#toString()}. |
|
228 |
* @return a string representation of this call site descriptor's |
|
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* {@link Lookup} object. |
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*/ |
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protected abstract String lookupToString(); |
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|
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private int getNameLength() { |
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final int c = getNameTokenCount(); |
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int l = 0; |
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for(int i = 0; i < c; ++i) { |
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l += getNameToken(i).length(); |
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} |
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return l + c - 1; |
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} |
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private StringBuilder appendName(final StringBuilder b) { |
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b.append(getNameToken(0)); |
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final int c = getNameTokenCount(); |
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for(int i = 1; i < c; ++i) { |
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b.append(':').append(getNameToken(i)); |
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} |
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return b; |
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} |
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} |