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    1   /*
    2    * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package com.sun.tools.javac.code;
   27   
   28   import java.util.HashMap;
   29   import java.util.Map;
   30   
   31   import com.sun.tools.javac.util.Assert;
   32   import com.sun.tools.javac.util.Context;
   33   import com.sun.tools.javac.util.ListBuffer;
   34   import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
   35   
   36   /**
   37    *
   38    * <p><b>This is NOT part of any supported API.
   39    * If you write code that depends on this, you do so at your own risk.
   40    * This code and its internal interfaces are subject to change or
   41    * deletion without notice.</b>
   42    */
   43   public class DeferredLintHandler {
   44       protected static final Context.Key<DeferredLintHandler> deferredLintHandlerKey =
   45           new Context.Key<DeferredLintHandler>();
   46   
   47       public static DeferredLintHandler instance(Context context) {
   48           DeferredLintHandler instance = context.get(deferredLintHandlerKey);
   49           if (instance == null)
   50               instance = new DeferredLintHandler(context);
   51           return instance;
   52       }
   53   
   54       protected DeferredLintHandler(Context context) {
   55           context.put(deferredLintHandlerKey, this);
   56       }
   57   
   58       private DeferredLintHandler() {}
   59   
   60       public interface LintLogger {
   61           void report();
   62       }
   63   
   64       private DiagnosticPosition currentPos;
   65       private Map<DiagnosticPosition, ListBuffer<LintLogger>> loggersQueue = new HashMap<DiagnosticPosition, ListBuffer<LintLogger>>();
   66   
   67       public void report(LintLogger logger) {
   68           ListBuffer<LintLogger> loggers = loggersQueue.get(currentPos);
   69           Assert.checkNonNull(loggers);
   70           loggers.append(logger);
   71       }
   72   
   73       public void flush(DiagnosticPosition pos) {
   74           ListBuffer<LintLogger> loggers = loggersQueue.get(pos);
   75           if (loggers != null) {
   76               for (LintLogger lintLogger : loggers) {
   77                   lintLogger.report();
   78               }
   79               loggersQueue.remove(pos);
   80           }
   81       }
   82   
   83       public DeferredLintHandler setPos(DiagnosticPosition currentPos) {
   84           this.currentPos = currentPos;
   85           loggersQueue.put(currentPos, ListBuffer.<LintLogger>lb());
   86           return this;
   87       }
   88   
   89       public static final DeferredLintHandler immediateHandler = new DeferredLintHandler() {
   90           @Override
   91           public void report(LintLogger logger) {
   92               logger.report();
   93           }
   94       };
   95   }

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