1 /*
   2  * Copyright (c) 2014, 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 package com.sun.tools.sjavac.comp.dependencies;
  26 
  27 import java.util.HashSet;
  28 import java.util.Set;
  29 
  30 import com.sun.source.tree.Tree;
  31 import com.sun.source.util.TaskEvent;
  32 import com.sun.source.util.TaskListener;
  33 import com.sun.tools.javac.code.Symbol.ClassSymbol;
  34 import com.sun.tools.javac.tree.JCTree.JCClassDecl;
  35 import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
  36 import com.sun.tools.javac.util.Context;
  37 import com.sun.tools.javac.util.DefinedBy;
  38 import com.sun.tools.javac.util.DefinedBy.Api;
  39 import com.sun.tools.sjavac.comp.Dependencies;
  40 
  41 public class PublicApiCollector implements TaskListener {
  42 
  43     private Context context;
  44     private final Set<ClassSymbol> classSymbols = new HashSet<>();
  45 
  46     public PublicApiCollector(Context context) {
  47         this.context = context;
  48     }
  49 
  50     @Override
  51     @DefinedBy(Api.COMPILER_TREE)
  52     public void finished(TaskEvent e) {
  53         switch (e.getKind()) {
  54         case ANALYZE:
  55             collectClassSymbols((JCCompilationUnit) e.getCompilationUnit());
  56             break;
  57         case COMPILATION:
  58             extractPubApis();
  59             break;
  60         }
  61     }
  62 
  63     private void collectClassSymbols(JCCompilationUnit cu) {
  64         for (Tree t : cu.getTypeDecls()) {
  65             if (t instanceof JCClassDecl)  // Can also be a JCSkip
  66                 classSymbols.add(((JCClassDecl) t).sym);
  67         }
  68     }
  69 
  70     private void extractPubApis() {
  71         // For incremental builds we need to remember the public api of what
  72         // we depend upon.
  73         // Within a single compilation loop, we need to keep track of public
  74         // api of what we're compiling to decide if any dependants needs to
  75         // be tainted.
  76         Dependencies deps = Dependencies.instance(context);
  77         for (ClassSymbol cs : classSymbols)
  78             deps.visitPubapi(cs);
  79     }
  80 }