content: /*
   * Copyright (c) 2012, 2020, Oracle and/or its affiliates. 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.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package openjdk.tools.sjavac;
  
  import java.io.File;
  import java.io.PrintWriter;
  import java.io.StringWriter;
  import java.nio.file.Path;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import java.util.StringTokenizer;
  import java.util.function.Function;
  import java.util.regex.Pattern;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  /**
   * Utilities.
   *
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  public class Util {
  
      public static String toFileSystemPath(String pkgId) {
          if (pkgId == null || pkgId.length()==0) return null;
          String pn;
          if (pkgId.charAt(0) == ':') {
              // When the module is the default empty module.
              // Do not prepend the module directory, because there is none.
              // Thus :java.foo.bar translates to java/foo/bar (or \)
              pn = pkgId.substring(1).replace('.',File.separatorChar);
          } else {
              // There is a module. Thus jdk.base:java.foo.bar translates
              // into jdk.base/java/foo/bar
              int cp = pkgId.indexOf(':');
              String mn = pkgId.substring(0,cp);
              pn = mn+File.separatorChar+pkgId.substring(cp+1).replace('.',File.separatorChar);
          }
          return pn;
      }
  
      public static String justPackageName(String pkgName) {
          int c = pkgName.indexOf(":");
          if (c == -1)
              throw new IllegalArgumentException("Expected ':' in package name (" + pkgName + ")");
          return pkgName.substring(c+1);
      }
  
      public static String extractStringOption(String opName, String s) {
          return extractStringOption(opName, s, null);
      }
  
      private static String extractStringOptionWithDelimiter(String opName, String s, String deflt, char delimiter) {
          int p = s.indexOf(opName+"=");
          if (p == -1) return deflt;
          p+=opName.length()+1;
          int pe = s.indexOf(delimiter, p);
          if (pe == -1) pe = s.length();
          return s.substring(p, pe);
      }
  
      public static String extractStringOption(String opName, String s, String deflt) {
          return extractStringOptionWithDelimiter(opName, s, deflt, ',');
      }
  
      public static String extractStringOptionLine(String opName, String s, String deflt) {
          return extractStringOptionWithDelimiter(opName, s, deflt, '\n').strip();
      }
  
      public static boolean extractBooleanOption(String opName, String s, boolean deflt) {
          String str = extractStringOption(opName, s);
          return "true".equals(str) ? true
               : "false".equals(str) ? false
               : deflt;
      }
  
      public static int extractIntOption(String opName, String s) {
          return extractIntOption(opName, s, 0);
      }
  
      public static int extractIntOption(String opName, String s, int deflt) {
          int p = s.indexOf(opName+"=");
          if (p == -1) return deflt;
          p+=opName.length()+1;
          int pe = s.indexOf(',', p);
          if (pe == -1) pe = s.length();
          int v = 0;
          try {
              v = Integer.parseInt(s.substring(p, pe));
          } catch (Exception e) {}
          return v;
      }
  
      /**
       * Extract the package name from a fully qualified class name.
       *
       * Example: Given "pkg.subpkg.A" this method returns ":pkg.subpkg".
       * Given "C" this method returns ":".
       *
       * @returns package name of the given class name
       */
      public static String pkgNameOfClassName(String fqClassName) {
          int i = fqClassName.lastIndexOf('.');
          String pkg = i == -1 ? "" : fqClassName.substring(0, i);
          return ":" + pkg;
      }
  
      /**
       * Clean out unwanted sub options supplied inside a primary option.
       * For example to only had portfile remaining from:
       *    settings="--server:id=foo,portfile=bar"
       * do settings = cleanOptions("--server:",Util.set("-portfile"),settings);
       *    now settings equals "--server:portfile=bar"
       *
       * @param allowedSubOptions A set of the allowed sub options, id portfile etc.
       * @param s The option settings string.
       */
      public static String cleanSubOptions(Set<String> allowedSubOptions, String s) {
          StringBuilder sb = new StringBuilder();
          StringTokenizer st = new StringTokenizer(s, ",");
          while (st.hasMoreTokens()) {
              String o = st.nextToken();
              int p = o.indexOf('=');
              if (p>0) {
                  String key = o.substring(0,p);
                  String val = o.substring(p+1);
                  if (allowedSubOptions.contains(key)) {
                      if (sb.length() > 0) sb.append(',');
                      sb.append(key+"="+val);
                  }
              }
          }
          return sb.toString();
      }
  
      /**
       * Convenience method to create a set with strings.
       */
      public static Set<String> set(String... ss) {
          Set<String> set = new HashSet<>();
          set.addAll(Arrays.asList(ss));
          return set;
      }
  
      /**
       * Normalize windows drive letter paths to upper case to enable string
       * comparison.
       *
       * @param file File name to normalize
       * @return The normalized string if file has a drive letter at the beginning,
       *         otherwise the original string.
       */
      public static String normalizeDriveLetter(String file) {
          if (file.length() > 2 && file.charAt(1) == ':') {
              return Character.toUpperCase(file.charAt(0)) + file.substring(1);
          } else if (file.length() > 3 && file.charAt(0) == '*'
                     && file.charAt(2) == ':') {
              // Handle a wildcard * at the beginning of the string.
              return file.substring(0, 1) + Character.toUpperCase(file.charAt(1))
                     + file.substring(2);
          }
          return file;
      }
  
      /**
       * Locate the setting for the server properties.
       */
      public static String findServerSettings(String[] args) {
          for (String s : args) {
              if (s.startsWith("--server:")) {
                  return s;
              }
          }
          return null;
      }
  
      public static <E> Set<E> union(Set<? extends E> s1,
                                     Set<? extends E> s2) {
          Set<E> union = new HashSet<>();
          union.addAll(s1);
          union.addAll(s2);
          return union;
      }
  
      public static <E> Set<E> subtract(Set<? extends E> orig,
                                        Set<? extends E> toSubtract) {
          Set<E> difference = new HashSet<>(orig);
          difference.removeAll(toSubtract);
          return difference;
      }
  
      public static String getStackTrace(Throwable t) {
          StringWriter sw = new StringWriter();
          t.printStackTrace(new PrintWriter(sw));
          return sw.toString();
      }
  
      // TODO: Remove when refactoring from java.io.File to java.nio.file.Path.
      public static File pathToFile(Path path) {
          return path == null ? null : path.toFile();
      }
  
      public static <E> Set<E> intersection(Collection<? extends E> c1,
                                            Collection<? extends E> c2) {
          Set<E> intersection = new HashSet<E>(c1);
          intersection.retainAll(c2);
          return intersection;
      }
  
      public static <I, T> Map<I, T> indexBy(Collection<? extends T> c,
                                             Function<? super T, ? extends I> indexFunction) {
          return c.stream().collect(Collectors.<T, I, T>toMap(indexFunction, o -> o));
      }
  
      public static String fileSuffix(Path file) {
          String fileNameStr = file.getFileName().toString();
          int dotIndex = fileNameStr.indexOf('.');
          return dotIndex == -1 ? "" : fileNameStr.substring(dotIndex);
      }
  
      public static Stream<String> getLines(String str) {
          return str.isEmpty()
                  ? Stream.empty()
                  : Stream.of(str.split(Pattern.quote(System.lineSeparator())));
      }
  }
  