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1 /* |
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2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.tools.javac.code; |
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27 |
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28 import com.sun.source.util.ParameterNameProvider; |
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29 import com.sun.tools.javac.code.Symbol.ParamSymbol; |
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30 import com.sun.tools.javac.util.Context; |
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31 import com.sun.tools.javac.util.Name; |
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32 import com.sun.tools.javac.util.Names; |
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33 |
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34 /** |
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35 * A Context class, that can return additional useful information for Symbols, currently |
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36 * parameter names. It does so by calling user-supplied {@link ParameterNameProvider}. |
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37 * |
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38 * <p><b>This is NOT part of any supported API. |
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39 * If you write code that depends on this, you do so at your own risk. |
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40 * This code and its internal interfaces are subject to change or |
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41 * deletion without notice.</b> |
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42 */ |
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43 public class MissingInfoHandler { |
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44 protected static final Context.Key<MissingInfoHandler> missingInfoHandlerWrapperKey = new Context.Key<>(); |
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45 |
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46 public static MissingInfoHandler instance(Context context) { |
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47 MissingInfoHandler instance = context.get(missingInfoHandlerWrapperKey); |
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48 if (instance == null) |
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49 instance = new MissingInfoHandler(context); |
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50 return instance; |
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51 } |
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52 |
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53 private final Names names; |
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54 private ParameterNameProvider parameterNameProvider; |
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55 |
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56 protected MissingInfoHandler(Context context) { |
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57 context.put(missingInfoHandlerWrapperKey, this); |
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58 names = Names.instance(context); |
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59 } |
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60 |
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61 public Name getParameterName(ParamSymbol parameter) { |
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62 if (parameterNameProvider != null) { |
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63 CharSequence name = parameterNameProvider.getParameterName(parameter); |
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64 if (name != null) { |
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65 return names.fromString(name.toString()); |
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66 } |
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67 } |
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68 |
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69 return null; |
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70 } |
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71 |
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72 public void setDelegate(ParameterNameProvider delegate) { |
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73 this.parameterNameProvider = delegate; |
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74 } |
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75 } |