Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright 2010 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  */

 import java.awt.BorderLayout;

 import java.awt.Color;

 import java.awt.Dimension;

 import java.awt.EventQueue;

 import java.awt.Font;

 import java.awt.GridBagConstraints;

 import java.awt.GridBagLayout;

 import java.awt.Rectangle;

 import java.awt.event.ActionEvent;

 import java.awt.event.ActionListener;

 import java.awt.event.MouseAdapter;

 import java.awt.event.MouseEvent;

 import java.io.File;

 import java.io.IOException;

 import java.io.PrintStream;

 import java.io.PrintWriter;

 import java.io.StringWriter;

 import java.lang.reflect.Field;

 import java.lang.reflect.Modifier;

 import java.nio.charset.Charset;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 import java.util.Set;

 import javax.swing.DefaultComboBoxModel;

 import javax.swing.JComboBox;

 import javax.swing.JComponent;

 import javax.swing.JFrame;

 import javax.swing.JLabel;

 import javax.swing.JPanel;

 import javax.swing.JScrollPane;

 import javax.swing.JTextArea;

 import javax.swing.JTextField;

 import javax.swing.SwingUtilities;

 import javax.swing.event.CaretEvent;

 import javax.swing.event.CaretListener;

 import javax.swing.text.BadLocationException;

 import javax.swing.text.DefaultHighlighter;

 import javax.swing.text.Highlighter;

 import javax.tools.Diagnostic;

 import javax.tools.DiagnosticListener;

 import javax.tools.JavaFileObject;

 import javax.tools.StandardJavaFileManager;

 import com.sun.source.tree.CompilationUnitTree;

 import com.sun.source.util.JavacTask;

 import com.sun.tools.javac.api.JavacTool;

 import com.sun.tools.javac.code.Flags;

 import com.sun.tools.javac.tree.JCTree;

 import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;

 import com.sun.tools.javac.tree.JCTree.JCNewClass;

 import com.sun.tools.javac.tree.JCTree.JCVariableDecl;

 import com.sun.tools.javac.tree.TreeInfo;

 import com.sun.tools.javac.tree.TreeScanner;

 import static com.sun.tools.javac.util.Position.NOPOS;

 /**

  * Utility and test program to check validity of tree positions for tree nodes.

  * The program can be run standalone, or as a jtreg test.  In standalone mode,

  * errors can be displayed in a gui viewer. For info on command line args,

  * run program with no args.

  *

  * <p>

  * jtreg: Note that by using the -r switch in the test description below, this test

  * will process all java files in the langtools/test directory, thus implicitly

  * covering any new language features that may be tested in this test suite.

  */

 /*

  * @test

  * @bug 6919889

  * @summary assorted position errors in compiler syntax trees

  * @run main TreePosTest -q -r -ef ./tools/javac/typeAnnotations -ef ./tools/javap/typeAnnotations -et ANNOTATED_TYPE .

  */

 public class TreePosTest {

     /**

      * Main entry point.

      * If test.src is set, program runs in jtreg mode, and will throw an Error

      * if any errors arise, otherwise System.exit will be used, unless the gui

      * viewer is being used. In jtreg mode, the default base directory for file

      * args is the value of ${test.src}. In jtreg mode, the -r option can be

      * given to change the default base directory to the root test directory.

      */

     public static void main(String... args) {

         String testSrc = System.getProperty("test.src");

         File baseDir = (testSrc == null) ? null : new File(testSrc);

         boolean ok = new TreePosTest().run(baseDir, args);

         if (!ok) {

             if (testSrc != null)  // jtreg mode

                 throw new Error("failed");

             else

                 System.exit(1);

         }

     }

     /**

      * Run the program. A base directory can be provided for file arguments.

      * In jtreg mode, the -r option can be given to change the default base

      * directory to the test root directory. For other options, see usage().

      * @param baseDir base directory for any file arguments.

      * @param args command line args

      * @return true if successful or in gui mode

      */

     boolean run(File baseDir, String... args) {

         if (args.length == 0) {

             usage(System.out);

             return true;

         }

         List<File> files = new ArrayList<File>();

         for (int i = 0; i < args.length; i++) {

             String arg = args[i];

             if (arg.equals("-encoding") && i + 1 < args.length)

                 encoding = args[++i];

             else if (arg.equals("-gui"))

                 gui = true;

             else if (arg.equals("-q"))

                 quiet = true;

             else if (arg.equals("-v"))

                 verbose = true;

             else if (arg.equals("-t") && i + 1 < args.length)

                 tags.add(args[++i]);

             else if (arg.equals("-ef") && i + 1 < args.length)

                 excludeFiles.add(new File(baseDir, args[++i]));

             else if (arg.equals("-et") && i + 1 < args.length)

                 excludeTags.add(args[++i]);

             else if (arg.equals("-r")) {

                 if (excludeFiles.size() > 0)

                     throw new Error("-r must be used before -ef");

                 File d = baseDir;

                 while (!new File(d, "TEST.ROOT").exists()) {

                     d = d.getParentFile();

                     if (d == null)

                         throw new Error("cannot find TEST.ROOT");

                 }

                 baseDir = d;

             }

             else if (arg.startsWith("-"))

                 throw new Error("unknown option: " + arg);

             else {

                 while (i < args.length)

                     files.add(new File(baseDir, args[i++]));

             }

         }

         for (File file: files) {

             if (file.exists())

                 test(file);

             else

                 error("File not found: " + file);

         }

         if (fileCount != 1)

             System.err.println(fileCount + " files read");

         if (errors > 0)

             System.err.println(errors + " errors");

         return (gui || errors == 0);

     }

     /**

      * Print command line help.

      * @param out output stream

      */

     void usage(PrintStream out) {

         out.println("Usage:");

         out.println("  java TreePosTest options... files...");

         out.println("");

         out.println("where options include:");

         out.println("-gui      Display returns in a GUI viewer");

         out.println("-q        Quiet: don't report on inapplicable files");

         out.println("-v        Verbose: report on files as they are being read");

         out.println("-t tag    Limit checks to tree nodes with this tag");

         out.println("          Can be repeated if desired");

         out.println("-ef file  Exclude file or directory");

         out.println("-et tag   Exclude tree nodes with given tag name");

         out.println("");

         out.println("files may be directories or files");

         out.println("directories will be scanned recursively");

         out.println("non java files, or java files which cannot be parsed, will be ignored");

         out.println("");

     }

     /**

      * Test a file. If the file is a directory, it will be recursively scanned

      * for java files.

      * @param file the file or directory to test

      */

     void test(File file) {

         if (excludeFiles.contains(file)) {

             if (!quiet)

                 error("File " + file + " excluded");

             return;

         }

         if (file.isDirectory()) {

             for (File f: file.listFiles()) {

                 test(f);

             }

             return;

         }

         if (file.isFile() && file.getName().endsWith(".java")) {

             try {

                 if (verbose)

                     System.err.println(file);

                 fileCount++;

                 PosTester p = new PosTester();

                 p.test(read(file));

             } catch (ParseException e) {

                 if (!quiet) {

                     error("Error parsing " + file + "\n" + e.getMessage());

                 }

             } catch (IOException e) {

                 error("Error reading " + file + ": " + e);

             }

             return;

         }

         if (!quiet)

             error("File " + file + " ignored");

     }

     /**

      * Read a file.

      * @param file the file to be read

      * @return the tree for the content of the file

      * @throws IOException if any IO errors occur

      * @throws TreePosTest.ParseException if any errors occur while parsing the file

      */

     JCCompilationUnit read(File file) throws IOException, ParseException {

         StringWriter sw = new StringWriter();

         PrintWriter pw = new PrintWriter(sw);

         Reporter r = new Reporter(pw);

         JavacTool tool = JavacTool.create();

         Charset cs = (encoding == null ? null : Charset.forName(encoding));

         StandardJavaFileManager fm = tool.getStandardFileManager(r, null, null);

         Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects(file);

         JavacTask task = tool.getTask(pw, fm, r, Collections.<String>emptyList(), null, files);

         Iterable<? extends CompilationUnitTree> trees = task.parse();

         pw.flush();

         if (r.errors > 0)

             throw new ParseException(sw.toString());

         Iterator<? extends CompilationUnitTree> iter = trees.iterator();

         if (!iter.hasNext())

             throw new Error("no trees found");

         JCCompilationUnit t = (JCCompilationUnit) iter.next();

         if (iter.hasNext())

             throw new Error("too many trees found");

         return t;

     }

     /**

      * Report an error. When the program is complete, the program will either

      * exit or throw an Error if any errors have been reported.

      * @param msg the error message

      */

     void error(String msg) {

         System.err.println(msg);

         errors++;

     }

     /** Number of files that have been analyzed. */

     int fileCount;

     /** Number of errors reported. */

     int errors;

     /** Flag: don't report irrelevant files. */

     boolean quiet;

     /** Flag: report files as they are processed. */

     boolean verbose;

     /** Flag: show errors in GUI viewer. */

     boolean gui;

     /** Option: encoding for test files. */

     String encoding;

     /** The GUI viewer for errors. */

     Viewer viewer;

     /** The set of tags for tree nodes to be analyzed; if empty, all tree nodes

      * are analyzed. */

     Set<String> tags = new HashSet<String>();

     /** Set of files and directories to be excluded from analysis. */

     Set<File> excludeFiles = new HashSet<File>();

     /** Set of tag names to be excluded from analysis. */

     Set<String> excludeTags = new HashSet<String>();

     /** Table of printable names for tree tag values. */

     TagNames tagNames = new TagNames();

     /**

      * Main class for testing assertions concerning tree positions for tree nodes.

      */

     private class PosTester extends TreeScanner {

         void test(JCCompilationUnit tree) {

             sourcefile = tree.sourcefile;

             endPosTable = tree.endPositions;

             encl = new Info();

             tree.accept(this);

         }

         @Override

         public void scan(JCTree tree) {

             if (tree == null)

                 return;

             Info self = new Info(tree, endPosTable);

             if (check(encl, self)) {

                 // Modifiers nodes are present throughout the tree even where

                 // there is no corresponding source text.

                 // Redundant semicolons in a class definition can cause empty

                 // initializer blocks with no positions.

                 if ((self.tag == JCTree.MODIFIERS || self.tag == JCTree.BLOCK)

                         && self.pos == NOPOS) {

                     // If pos is NOPOS, so should be the start and end positions

                     check("start == NOPOS", encl, self, self.start == NOPOS);

                     check("end == NOPOS", encl, self, self.end == NOPOS);

                 } else {

                     // For this node, start , pos, and endpos should be all defined

                     check("start != NOPOS", encl, self, self.start != NOPOS);

                     check("pos != NOPOS", encl, self, self.pos != NOPOS);

                     check("end != NOPOS", encl, self, self.end != NOPOS);

                     // The following should normally be ordered

                     // encl.start <= start <= pos <= end <= encl.end

                     // In addition, the position of the enclosing node should be

                     // within this node.

                     // The primary exceptions are for array type nodes, because of the

                     // need to support legacy syntax:

                     //    e.g.    int a[];    int[] b[];    int f()[] { return null; }

                     // and because of inconsistent nesting of left and right of

                     // array declarations:

                     //    e.g.    int[][] a = new int[2][];

                     check("encl.start <= start", encl, self, encl.start <= self.start);

                     check("start <= pos", encl, self, self.start <= self.pos);

                     if (!(self.tag == JCTree.TYPEARRAY

                             && (encl.tag == JCTree.VARDEF || encl.tag == JCTree.TYPEARRAY))) {

                         check("encl.pos <= start || end <= encl.pos",

                                 encl, self, encl.pos <= self.start || self.end <= encl.pos);

                     }

                     check("pos <= end", encl, self, self.pos <= self.end);

                     if (!(self.tag == JCTree.TYPEARRAY && encl.tag == JCTree.TYPEARRAY)) {

                         check("end <= encl.end", encl, self, self.end <= encl.end);

                     }

                 }

             }

             Info prevEncl = encl;

             encl = self;

             tree.accept(this);

             encl = prevEncl;

         }

         @Override

         public void visitVarDef(JCVariableDecl tree) {

             // enum member declarations are desugared in the parser and have

             // ill-defined semantics for tree positions, so for now, we

             // skip the synthesized bits and just check parts which came from

             // the original source text

             if ((tree.mods.flags & Flags.ENUM) != 0) {

                 scan(tree.mods);

                 if (tree.init != null) {

                     if (tree.init.getTag() == JCTree.NEWCLASS) {

                         JCNewClass init = (JCNewClass) tree.init;

                         if (init.args != null && init.args.nonEmpty()) {

                             scan(init.args);

                         }

                         if (init.def != null && init.def.defs != null) {

                             scan(init.def.defs);

                         }

                     }

                 }

             } else

                 super.visitVarDef(tree);

         }

         boolean check(Info encl, Info self) {

             if (excludeTags.size() > 0) {

                 if (encl != null && excludeTags.contains(tagNames.get(encl.tag))

                         || excludeTags.contains(tagNames.get(self.tag)))

                     return false;

             }

             return tags.size() == 0 || tags.contains(tagNames.get(self.tag));

         }

         void check(String label, Info encl, Info self, boolean ok) {

             if (!ok) {

                 if (gui) {

                     if (viewer == null)

                         viewer = new Viewer();

                     viewer.addEntry(sourcefile, label, encl, self);

                 }

                 String s = self.tree.toString();

                 String msg = sourcefile.getName() + ": " + label + ": " +

                         "encl:" + encl + " this:" + self + "\n" +

                         s.substring(0, Math.min(80, s.length())).replaceAll("[\r\n]+", " ");

                 error(msg);

             }

         }

         JavaFileObject sourcefile;

         Map<JCTree, Integer> endPosTable;

         Info encl;

     }

     /**

      * Utility class providing easy access to position and other info for a tree node.

      */

     private class Info {

         Info() {

             tree = null;

             tag = JCTree.ERRONEOUS;

             start = 0;

             pos = 0;

             end = Integer.MAX_VALUE;

         }

         Info(JCTree tree, Map<JCTree, Integer> endPosTable) {

             this.tree = tree;

             tag = tree.getTag();

             start = TreeInfo.getStartPos(tree);

             pos = tree.pos;

             end = TreeInfo.getEndPos(tree, endPosTable);

         }

         @Override

         public String toString() {

             return tagNames.get(tree.getTag()) + "[start:" + start + ",pos:" + pos + ",end:" + end + "]";

         }

         final JCTree tree;

         final int tag;

         final int start;

         final int pos;

         final int end;

     }

     /**

      * Names for tree tags.

      * javac does not provide an API to convert tag values to strings, so this class uses

      * reflection to determine names of public static final int values in JCTree.

      */

     private static class TagNames {

         String get(int tag) {

             if (map == null) {

                 map = new HashMap<Integer, String>();

                 Class c = JCTree.class;

                 for (Field f : c.getDeclaredFields()) {

                     if (f.getType().equals(int.class)) {

                         int mods = f.getModifiers();

                         if (Modifier.isPublic(mods) && Modifier.isStatic(mods) && Modifier.isFinal(mods)) {

                             try {

                                 map.put(f.getInt(null), f.getName());

                             } catch (IllegalAccessException e) {

                             }

                         }

                     }

                 }

             }

             String name = map.get(tag);

             return (name == null) ? "??" : name;

         }

         private Map<Integer, String> map;

     }

     /**

      * Thrown when errors are found parsing a java file.

      */

     private static class ParseException extends Exception {

         ParseException(String msg) {

             super(msg);

         }

     }

     /**

      * DiagnosticListener to report diagnostics and count any errors that occur.

      */

     private static class Reporter implements DiagnosticListener<JavaFileObject> {

         Reporter(PrintWriter out) {

             this.out = out;

         }

         public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

             out.println(diagnostic);

             switch (diagnostic.getKind()) {

                 case ERROR:

                     errors++;

             }

         }

         int errors;

         PrintWriter out;

     }

     /**

      * GUI viewer for issues found by TreePosTester. The viewer provides a drop

      * down list for selecting error conditions, a header area providing details

      * about an error, and a text area with the ranges of text highlighted as

      * appropriate.

      */

     private class Viewer extends JFrame {

         /**

          * Create a viewer.

          */

         Viewer() {

             initGUI();

         }

         /**

          * Add another entry to the list of errors.

          * @param file The file containing the error

          * @param check The condition that was being tested, and which failed

          * @param encl the enclosing tree node

          * @param self the tree node containing the error

          */

         void addEntry(JavaFileObject file, String check, Info encl, Info self) {

             Entry e = new Entry(file, check, encl, self);

             DefaultComboBoxModel m = (DefaultComboBoxModel) entries.getModel();

             m.addElement(e);

             if (m.getSize() == 1)

                 entries.setSelectedItem(e);

         }

         /**

          * Initialize the GUI window.

          */

         private void initGUI() {

             JPanel head = new JPanel(new GridBagLayout());

             GridBagConstraints lc = new GridBagConstraints();

             GridBagConstraints fc = new GridBagConstraints();

             fc.anchor = GridBagConstraints.WEST;

             fc.fill = GridBagConstraints.HORIZONTAL;

             fc.gridwidth = GridBagConstraints.REMAINDER;

             entries = new JComboBox();

             entries.addActionListener(new ActionListener() {

                 public void actionPerformed(ActionEvent e) {

                     showEntry((Entry) entries.getSelectedItem());

                 }

             });

             fc.insets.bottom = 10;

             head.add(entries, fc);

             fc.insets.bottom = 0;

             head.add(new JLabel("check:"), lc);

             head.add(checkField = createTextField(80), fc);

             fc.fill = GridBagConstraints.NONE;

             head.add(setBackground(new JLabel("encl:"), enclColor), lc);

             head.add(enclPanel = new InfoPanel(), fc);

             head.add(setBackground(new JLabel("self:"), selfColor), lc);

             head.add(selfPanel = new InfoPanel(), fc);

             add(head, BorderLayout.NORTH);

             body = new JTextArea();

             body.setFont(Font.decode(Font.MONOSPACED));

             body.addCaretListener(new CaretListener() {

                 public void caretUpdate(CaretEvent e) {

                     int dot = e.getDot();

                     int mark = e.getMark();

                     if (dot == mark)

                         statusText.setText("dot: " + dot);

                     else

                         statusText.setText("dot: " + dot + ", mark:" + mark);

                 }

             });

             JScrollPane p = new JScrollPane(body,

                     JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,

                     JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

             p.setPreferredSize(new Dimension(640, 480));

             add(p, BorderLayout.CENTER);

             statusText = createTextField(80);

             add(statusText, BorderLayout.SOUTH);

             pack();

             setLocationRelativeTo(null); // centered on screen

             setVisible(true);

             setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         }

         /** Show an entry that has been selected. */

         private void showEntry(Entry e) {

             try {

                 // update simple fields

                 setTitle(e.file.getName());

                 checkField.setText(e.check);

                 enclPanel.setInfo(e.encl);

                 selfPanel.setInfo(e.self);

                 // show file text with highlights

                 body.setText(e.file.getCharContent(true).toString());

                 Highlighter highlighter = body.getHighlighter();

                 highlighter.removeAllHighlights();

                 addHighlight(highlighter, e.encl, enclColor);

                 addHighlight(highlighter, e.self, selfColor);

                 scroll(body, getMinPos(enclPanel.info, selfPanel.info));

             } catch (IOException ex) {

                 body.setText("Cannot read " + e.file.getName() + ": " + e);

             }

         }

         /** Create a test field. */

         private JTextField createTextField(int width) {

             JTextField f = new JTextField(width);

             f.setEditable(false);

             f.setBorder(null);

             return f;

         }

         /** Add a highlighted region based on the positions in an Info object. */

         private void addHighlight(Highlighter h, Info info, Color c) {

             int start = info.start;

             int end = info.end;

             if (start == -1 && end == -1)

                 return;

             if (start == -1)

                 start = end;

             if (end == -1)

                 end = start;

             try {

                 h.addHighlight(info.start, info.end,

                         new DefaultHighlighter.DefaultHighlightPainter(c));

                 if (info.pos != -1) {

                     Color c2 = new Color(c.getRed(), c.getGreen(), c.getBlue(), (int)(.4f * 255)); // 40%

                     h.addHighlight(info.pos, info.pos + 1,

                         new DefaultHighlighter.DefaultHighlightPainter(c2));

                 }

             } catch (BadLocationException e) {

                 e.printStackTrace();

             }

         }

         /** Get the minimum valid position in a set of info objects. */

         private int getMinPos(Info... values) {

             int i = Integer.MAX_VALUE;

             for (Info info: values) {

                 if (info.start >= 0) i = Math.min(i, info.start);

                 if (info.pos   >= 0) i = Math.min(i, info.pos);

                 if (info.end   >= 0) i = Math.min(i, info.end);

             }

             return (i == Integer.MAX_VALUE) ? 0 : i;

         }

         /** Set the background on a component. */

         private JComponent setBackground(JComponent comp, Color c) {

             comp.setOpaque(true);

             comp.setBackground(c);

             return comp;

         }

         /** Scroll a text area to display a given position near the middle of the visible area. */

         private void scroll(final JTextArea t, final int pos) {

             // Using invokeLater appears to give text a chance to sort itself out

             // before the scroll happens; otherwise scrollRectToVisible doesn't work.

             // Maybe there's a better way to sync with the text...

             EventQueue.invokeLater(new Runnable() {

                 public void run() {

                     try {

                         Rectangle r = t.modelToView(pos);

                         JScrollPane p = (JScrollPane) SwingUtilities.getAncestorOfClass(JScrollPane.class, t);

                         r.y = Math.max(0, r.y - p.getHeight() * 2 / 5);

                         r.height += p.getHeight() * 4 / 5;

                         t.scrollRectToVisible(r);

                     } catch (BadLocationException ignore) {

                     }

                 }

             });

         }

         private JComboBox entries;

         private JTextField checkField;

         private InfoPanel enclPanel;

         private InfoPanel selfPanel;

         private JTextArea body;

         private JTextField statusText;

         private Color selfColor = new Color(0.f, 1.f, 0.f, 0.2f); // 20% green

         private Color enclColor = new Color(1.f, 0.f, 0.f, 0.2f); // 20% red

         /** Panel to display an Info object. */

         private class InfoPanel extends JPanel {

             InfoPanel() {

                 add(tagName = createTextField(20));

                 add(new JLabel("start:"));

                 add(addListener(start = createTextField(6)));

                 add(new JLabel("pos:"));

                 add(addListener(pos = createTextField(6)));

                 add(new JLabel("end:"));

                 add(addListener(end = createTextField(6)));

             }

             void setInfo(Info info) {

                 this.info = info;

                 tagName.setText(tagNames.get(info.tag));

                 start.setText(String.valueOf(info.start));

                 pos.setText(String.valueOf(info.pos));

                 end.setText(String.valueOf(info.end));

             }

             JTextField addListener(final JTextField f) {

                 f.addMouseListener(new MouseAdapter() {

                     @Override

                     public void mouseClicked(MouseEvent e) {

                         body.setCaretPosition(Integer.valueOf(f.getText()));

                         body.getCaret().setVisible(true);

                     }

                 });

                 return f;

             }

             Info info;

             JTextField tagName;

             JTextField start;

             JTextField pos;

             JTextField end;

         }

         /** Object to record information about an error to be displayed. */

         private class Entry {

             Entry(JavaFileObject file, String check, Info encl, Info self) {

                 this.file = file;

                 this.check = check;

                 this.encl = encl;

                 this.self= self;

             }

             @Override

             public String toString() {

                 return file.getName() + " " + check + " " + getMinPos(encl, self);

             }

             final JavaFileObject file;

             final String check;

             final Info encl;

             final Info self;

         }

     }

 }