| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the 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. |
| */ |
| package org.netbeans.modules.languages.antlr; |
| |
| import java.lang.ref.Reference; |
| import java.lang.ref.WeakReference; |
| import java.util.Collections; |
| import java.util.WeakHashMap; |
| import javax.swing.event.ChangeListener; |
| import org.netbeans.modules.parsing.api.ParserManager; |
| import org.netbeans.modules.parsing.api.ResultIterator; |
| import org.netbeans.modules.parsing.api.Snapshot; |
| import org.netbeans.modules.parsing.api.Source; |
| import org.netbeans.modules.parsing.api.Task; |
| import org.netbeans.modules.parsing.api.UserTask; |
| import org.netbeans.modules.parsing.spi.ParseException; |
| import org.netbeans.modules.parsing.spi.SourceModificationEvent; |
| import org.openide.filesystems.FileObject; |
| import org.openide.util.Exceptions; |
| |
| /** |
| * |
| * @author lkishalmi |
| */ |
| public abstract class AntlrParser extends org.netbeans.modules.parsing.spi.Parser { |
| |
| AntlrParserResult lastResult; |
| |
| /* |
| * The NetBeans indexer support is more appropriate for large scale project |
| * where parsing of all affected files would take a too long time. For ANTLR |
| * imports are only possible from the current directory, so it can be |
| * expected that the number of files that can be imported or need to be |
| * scanned is low. |
| */ |
| private static final WeakHashMap<FileObject, Reference<AntlrParserResult>> CACHE = new WeakHashMap<>(); |
| |
| protected abstract AntlrParserResult<?> createParserResult(Snapshot snapshot); |
| |
| @Override |
| public void parse(Snapshot snapshot, Task task, SourceModificationEvent event) throws ParseException { |
| AntlrParserResult<?> parserResult = createParserResult(snapshot); |
| |
| AntlrParserResult<?> parsed = parserResult.get(); |
| cacheResult(snapshot.getSource().getFileObject(), parsed); |
| lastResult = parsed; |
| } |
| |
| @Override |
| public Result getResult(Task task) throws ParseException { |
| assert lastResult != null; |
| return lastResult; |
| } |
| |
| @Override |
| public void addChangeListener(ChangeListener changeListener) { |
| } |
| |
| @Override |
| public void removeChangeListener(ChangeListener changeListener) { |
| } |
| |
| private static void cacheResult(FileObject fo, AntlrParserResult<?> result) { |
| synchronized (CACHE) { |
| CACHE.put(fo, new WeakReference<>(result)); |
| } |
| } |
| |
| public static AntlrParserResult getParserResult(FileObject fo) { |
| AntlrParserResult result = null; |
| java.lang.ref.Reference<AntlrParserResult> ceReference; |
| synchronized (CACHE) { |
| ceReference = CACHE.get(fo); |
| } |
| if (ceReference != null) { |
| result = ceReference.get(); |
| } |
| |
| if (result == null) { |
| try { |
| AntlrParserResult[] parserResult = new AntlrParserResult[1]; |
| ParserManager.parse(Collections.singleton(Source.create(fo)), new UserTask() { |
| @Override |
| public void run(ResultIterator resultIterator) throws Exception { |
| org.netbeans.modules.parsing.spi.Parser.Result result = resultIterator.getParserResult(); |
| if (result instanceof AntlrParserResult) { |
| parserResult[0] = (AntlrParserResult) result; |
| } |
| } |
| }); |
| if (parserResult[0] != null) { |
| result = parserResult[0]; |
| } |
| } catch (ParseException ex) { |
| Exceptions.printStackTrace(ex); |
| } |
| } |
| |
| return result; |
| } |
| |
| } |