108 lines
4.9 KiB
Java
108 lines
4.9 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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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
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* are met:
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*
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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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*
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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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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from 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 TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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import java.util.ArrayList;
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import java.util.List;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import jdk.dynalink.CallSiteDescriptor;
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import jdk.dynalink.NamedOperation;
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import jdk.dynalink.NamespaceOperation;
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import jdk.dynalink.Operation;
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import jdk.dynalink.StandardNamespace;
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import jdk.dynalink.StandardOperation;
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import jdk.dynalink.linker.GuardedInvocation;
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import jdk.dynalink.linker.GuardingDynamicLinker;
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import jdk.dynalink.linker.GuardingDynamicLinkerExporter;
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import jdk.dynalink.linker.LinkRequest;
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import jdk.dynalink.linker.LinkerServices;
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import jdk.dynalink.linker.support.SimpleLinkRequest;
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/**
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* This is a dynalink pluggable linker (see http://openjdk.java.net/jeps/276).
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* This linker translater underscore_separated method names to CamelCase names
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* used in Java APIs.
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*/
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public final class UnderscoreNameLinkerExporter extends GuardingDynamicLinkerExporter {
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static {
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System.out.println("pluggable dynalink underscore name linker loaded");
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}
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private static final Pattern UNDERSCORE_NAME = Pattern.compile("_(.)");
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// translate underscore_separated name as a CamelCase name
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private static String translateToCamelCase(final String name) {
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final Matcher m = UNDERSCORE_NAME.matcher(name);
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final StringBuilder buf = new StringBuilder();
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while (m.find()) {
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m.appendReplacement(buf, m.group(1).toUpperCase());
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}
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m.appendTail(buf);
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return buf.toString();
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}
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@Override
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public List<GuardingDynamicLinker> get() {
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final ArrayList<GuardingDynamicLinker> linkers = new ArrayList<>();
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linkers.add(new GuardingDynamicLinker() {
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@Override
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public GuardedInvocation getGuardedInvocation(final LinkRequest request,
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final LinkerServices linkerServices) throws Exception {
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final CallSiteDescriptor desc = request.getCallSiteDescriptor();
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final Operation op = desc.getOperation();
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final Object name = NamedOperation.getName(op);
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final Operation namespaceOp = NamedOperation.getBaseOperation(op);
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// is this a named GET_METHOD?
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final boolean isGetMethod =
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NamespaceOperation.getBaseOperation(namespaceOp) == StandardOperation.GET
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&& StandardNamespace.findFirst(namespaceOp) == StandardNamespace.METHOD;
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if (isGetMethod && name instanceof String) {
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final String str = (String)name;
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if (str.indexOf('_') == -1) {
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return null;
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}
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final String nameStr = translateToCamelCase(str);
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// create a new call descriptor to use translated name
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final CallSiteDescriptor newDesc = desc.changeOperation(((NamedOperation)op).changeName(nameStr));
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// create a new Link request to link the call site with translated name
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final LinkRequest newRequest = request.replaceArguments(newDesc, request.getArguments());
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// return guarded invocation linking the translated request
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return linkerServices.getGuardedInvocation(newRequest);
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}
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return null;
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}
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});
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return linkers;
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}
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}
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