tij0185.html

学习java的经典书籍

      Pr.error("closing " + os);
    }
  }
  <font color="#0000ff">static</font> <font color="#0000ff">void</font> close(Reader os) {
    <font color="#0000ff">try</font> {
      os.close();
    } <font color="#0000ff">catch</font>(IOException e) {
      Pr.error("closing " + os);
    }
  }
}

<font color="#0000ff">class</font> SourceCodeFile {
  <font color="#0000ff">public</font> <font color="#0000ff">static</font> <font color="#0000ff">final</font> String 
    startMarker = "<font color="#009900">//:", // Start of source file</font>
    endMarker = "} <font color="#009900">///:~", // End of source</font>
    endMarker2 = "}; <font color="#009900">///:~", // C++ file end</font>
    beginContinue = "} <font color="#009900">///:Continued",</font>
    endContinue = "<font color="#009900">///:Continuing",</font>
    packMarker = "###", <font color="#009900">// Packed file header tag</font>
    eol = <font color="#009900">// Line separator on current system</font>
      System.getProperty("line.separator"),
    filesep = <font color="#009900">// System's file path separator</font>
      System.getProperty("file.separator");
  <font color="#0000ff">public</font> <font color="#0000ff">static</font> String copyright = "";
  <font color="#0000ff">static</font> {
    <font color="#0000ff">try</font> {
      BufferedReader cr =
        <font color="#0000ff">new</font> BufferedReader(
          <font color="#0000ff">new</font> FileReader("Copyright.txt"));
      String crin;
      <font color="#0000ff">while</font>((crin = cr.readLine()) != <font color="#0000ff">null</font>)
        copyright += crin + "\n";
      cr.close();
    } <font color="#0000ff">catch</font>(Exception e) {
      copyright = "";
    }
  }
  <font color="#0000ff">private</font> String filename, dirname,
    contents = <font color="#0000ff">new</font> String();
  <font color="#0000ff">private</font> <font color="#0000ff">static</font> String chapter = "c02";
  <font color="#009900">// The file name separator from the old system:</font>
  <font color="#0000ff">public</font> <font color="#0000ff">static</font> String oldsep;
  <font color="#0000ff">public</font> String toString() {
    <font color="#0000ff">return</font> dirname + filesep + filename;
  }
  <font color="#009900">// Constructor for parsing from document file:</font>
  <font color="#0000ff">public</font> SourceCodeFile(String firstLine, 
      BufferedReader in) {
    dirname = chapter;
    <font color="#009900">// Skip past marker:</font>
    filename = firstLine.substring(
        startMarker.length()).trim();
    <font color="#009900">// Find space that terminates file name:</font>
    <font color="#0000ff">if</font>(filename.indexOf(' ') != -1)
      filename = filename.substring(
          0, filename.indexOf(' '));
    System.out.println("found: " + filename);
    contents = firstLine + eol;
    <font color="#0000ff">if</font>(copyright.length() != 0)
      contents += copyright + eol;
    String s;
    <font color="#0000ff">boolean</font> foundEndMarker = <font color="#0000ff">false</font>;
    <font color="#0000ff">try</font> {
      <font color="#0000ff">while</font>((s = in.readLine()) != <font color="#0000ff">null</font>) {
        <font color="#0000ff">if</font>(s.startsWith(startMarker))
          Pr.error("No end of file marker <font color="#0000ff">for</font> " +
            filename);
        <font color="#009900">// For this program, no spaces before </font>
        <font color="#009900">// the "package" keyword are allowed</font>
        <font color="#009900">// in the input source code:</font>
        <font color="#0000ff">else</font> <font color="#0000ff">if</font>(s.startsWith("<font color="#0000ff">package</font>")) {
          <font color="#009900">// Extract package name:</font>
          String pdir = s.substring(
            s.indexOf(' ')).trim();
          pdir = pdir.substring(
            0, pdir.indexOf(';')).trim();
          <font color="#009900">// Capture the chapter from the package</font>
          <font color="#009900">// ignoring the 'com' subdirectories:</font>
          <font color="#0000ff">if</font>(!pdir.startsWith("com")) {
            <font color="#0000ff">int</font> firstDot = pdir.indexOf('.');
            <font color="#0000ff">if</font>(firstDot != -1)
              chapter = 
                pdir.substring(0,firstDot);
            <font color="#0000ff">else</font>
              chapter = pdir;
          }
          <font color="#009900">// Convert package name to path name:</font>
          pdir = pdir.replace(
            '.', filesep.charAt(0));
          System.out.println("<font color="#0000ff">package</font> " + pdir);
          dirname = pdir;
        }
        contents += s + eol;
        <font color="#009900">// Move past continuations:</font>
        <font color="#0000ff">if</font>(s.startsWith(beginContinue))
          <font color="#0000ff">while</font>((s = in.readLine()) != <font color="#0000ff">null</font>)
            <font color="#0000ff">if</font>(s.startsWith(endContinue)) {
              contents += s + eol;
              <font color="#0000ff">break</font>;
            }
        <font color="#009900">// Watch for end of code listing:</font>
        <font color="#0000ff">if</font>(s.startsWith(endMarker) ||
           s.startsWith(endMarker2)) {
          foundEndMarker = <font color="#0000ff">true</font>;
          <font color="#0000ff">break</font>;
        }
      }
      <font color="#0000ff">if</font>(!foundEndMarker)
        Pr.error(
          "End marker not found before EOF");
      System.out.println("Chapter: " + chapter);
    } <font color="#0000ff">catch</font>(IOException e) {
      Pr.error("Error reading line");
    }
  }
  <font color="#009900">// For recovering from a packed file:</font>
  <font color="#0000ff">public</font> SourceCodeFile(BufferedReader pFile) {
    <font color="#0000ff">try</font> {
      String s = pFile.readLine();
      <font color="#0000ff">if</font>(s == <font color="#0000ff">null</font>) <font color="#0000ff">return</font>;
      <font color="#0000ff">if</font>(!s.startsWith(packMarker))
        Pr.error("Can't find " + packMarker
          + " in " + s);
      s = s.substring(
        packMarker.length()).trim();
      dirname = s.substring(0, s.indexOf('#'));
      filename = s.substring(s.indexOf('#') + 1);
      dirname = dirname.replace(
        oldsep.charAt(0), filesep.charAt(0));
      filename = filename.replace(
        oldsep.charAt(0), filesep.charAt(0));
      System.out.println("listing: " + dirname 
        + filesep + filename);
      <font color="#0000ff">while</font>((s = pFile.readLine()) != <font color="#0000ff">null</font>) {
        <font color="#009900">// Watch for end of code listing:</font>
        <font color="#0000ff">if</font>(s.startsWith(endMarker) ||
           s.startsWith(endMarker2)) {
          contents += s;
          <font color="#0000ff">break</font>;
        }
        contents += s + eol;
      }
    } <font color="#0000ff">catch</font>(IOException e) {
      System.err.println("Error reading line");
    }
  }
  <font color="#0000ff">public</font> <font color="#0000ff">boolean</font> hasFile() { 
    <font color="#0000ff">return</font> filename != <font color="#0000ff">null</font>; 
  }
  <font color="#0000ff">public</font> String directory() { <font color="#0000ff">return</font> dirname; }
  <font color="#0000ff">public</font> String filename() { <font color="#0000ff">return</font> filename; }
  <font color="#0000ff">public</font> String contents() { <font color="#0000ff">return</font> contents; }
  <font color="#009900">// To write to a packed file:</font>
  <font color="#0000ff">public</font> <font color="#0000ff">void</font> writePacked(DataOutputStream out) {
    <font color="#0000ff">try</font> {
      out.writeBytes(
        packMarker + dirname + "#" 
        + filename + eol);
      out.writeBytes(contents);
    } <font color="#0000ff">catch</font>(IOException e) {
      Pr.error("writing " + dirname + 
        filesep + filename);
    }
  }
  <font color="#009900">// To generate the actual file:</font>
  <font color="#0000ff">public</font> <font color="#0000ff">void</font> writeFile(String rootpath) {
    File path = <font color="#0000ff">new</font> File(rootpath, dirname);
    path.mkdirs();
    PrintWriter p =
      IO.psOpen(<font color="#0000ff">new</font> File(path, filename));
    p.print(contents);
    IO.close(p);
  }
}

<font color="#0000ff">class</font> DirMap {
  <font color="#0000ff">private</font> Hashtable t = <font color="#0000ff">new</font> Hashtable();
  <font color="#0000ff">private</font> String rootpath;
  DirMap() {
    rootpath = System.getProperty("user.dir");
  }
  DirMap(String alternateDir) {
    rootpath = alternateDir;
  }
  <font color="#0000ff">public</font> <font color="#0000ff">void</font> add(SourceCodeFile f){
    String path = f.directory();
    <font color="#0000ff">if</font>(!t.containsKey(path))
      t.put(path, <font color="#0000ff">new</font> Vector());
    ((Vector)t.get(path)).addElement(f);
  }
  <font color="#0000ff">public</font> <font color="#0000ff">void</font> writePackedFile(String fname) {
    DataOutputStream packed = IO.dosOpen(fname);
    <font color="#0000ff">try</font> {
      packed.writeBytes("###Old Separator:" +
        SourceCodeFile.filesep + "###\n");
    } <font color="#0000ff">catch</font>(IOException e) {
      Pr.error("Writing separator to " + fname);
    }
    Enumeration e = t.keys();
    <font color="#0000ff">while</font>(e.hasMoreElements()) {
      String dir = (String)e.nextElement();
      System.out.println(
        "Writing directory " + dir);
      Vector v = (Vector)t.get(dir);