Java example source code file (Class2HTML.java)
The Class2HTML.java Java example source code
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package com.sun.org.apache.bcel.internal.util;
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import java.io.*;
import java.util.BitSet;
import com.sun.org.apache.bcel.internal.classfile.*;
import com.sun.org.apache.bcel.internal.Constants;
/**
* Read class file(s) and convert them into HTML files.
*
* Given a JavaClass object "class" that is in package "package" five files
* will be created in the specified directory.
*
* <OL>
* <LI> "package"."class".html as the main file which defines the frames for
* the following subfiles.
* <LI> "package"."class"_attributes.html contains all (known) attributes found in the file
* <LI> "package"."class"_cp.html contains the constant pool
* <LI> "package"."class"_code.html contains the byte code
* <LI> "package"."class"_methods.html contains references to all methods and fields of the class
* </OL>
*
* All subfiles reference each other appropiately, e.g. clicking on a
* method in the Method's frame will jump to the appropiate method in
* the Code frame.
*
* @version $Id: Class2HTML.java,v 1.3 2007-07-19 04:34:52 ofung Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm
*/
public class Class2HTML implements Constants
{
private JavaClass java_class; // current class object
private String dir;
private static String class_package; // name of package, unclean to make it static, but ...
private static String class_name; // name of current class, dito
private static ConstantPool constant_pool;
/**
* Write contents of the given JavaClass into HTML files.
*
* @param java_class The class to write
* @param dir The directory to put the files in
*/
public Class2HTML(JavaClass java_class, String dir) throws IOException {
Method[] methods = java_class.getMethods();
this.java_class = java_class;
this.dir = dir;
class_name = java_class.getClassName(); // Remember full name
constant_pool = java_class.getConstantPool();
// Get package name by tacking off everything after the last `.'
int index = class_name.lastIndexOf('.');
if(index > -1)
class_package = class_name.substring(0, index);
else
class_package = ""; // default package
ConstantHTML constant_html = new ConstantHTML(dir, class_name, class_package, methods,
constant_pool);
/* Attributes can't be written in one step, so we just open a file
* which will be written consequently.
*/
AttributeHTML attribute_html = new AttributeHTML(dir, class_name, constant_pool, constant_html);
MethodHTML method_html = new MethodHTML(dir, class_name, methods, java_class.getFields(),
constant_html, attribute_html);
// Write main file (with frames, yuk)
writeMainHTML(attribute_html);
new CodeHTML(dir, class_name, methods, constant_pool, constant_html);
attribute_html.close();
}
public static void _main(String argv[])
{
String[] file_name = new String[argv.length];
int files=0;
ClassParser parser=null;
JavaClass java_class=null;
String zip_file = null;
char sep = SecuritySupport.getSystemProperty("file.separator").toCharArray()[0];
String dir = "." + sep; // Where to store HTML files
try {
/* Parse command line arguments.
*/
for(int i=0; i < argv.length; i++) {
if(argv[i].charAt(0) == '-') { // command line switch
if(argv[i].equals("-d")) { // Specify target directory, default '.'
dir = argv[++i];
if(!dir.endsWith("" + sep))
dir = dir + sep;
new File(dir).mkdirs(); // Create target directory if necessary
}
else if(argv[i].equals("-zip"))
zip_file = argv[++i];
else
System.out.println("Unknown option " + argv[i]);
}
else // add file name to list */
file_name[files++] = argv[i];
}
if(files == 0)
System.err.println("Class2HTML: No input files specified.");
else { // Loop through files ...
for(int i=0; i < files; i++) {
System.out.print("Processing " + file_name[i] + "...");
if(zip_file == null)
parser = new ClassParser(file_name[i]); // Create parser object from file
else
parser = new ClassParser(zip_file, file_name[i]); // Create parser object from zip file
java_class = parser.parse();
new Class2HTML(java_class, dir);
System.out.println("Done.");
}
}
} catch(Exception e) {
System.out.println(e);
e.printStackTrace(System.out);
}
}
/**
* Utility method that converts a class reference in the constant pool,
* i.e., an index to a string.
*/
static String referenceClass(int index) {
String str = constant_pool.getConstantString(index, CONSTANT_Class);
str = Utility.compactClassName(str);
str = Utility.compactClassName(str, class_package + ".", true);
return "<A HREF=\"" + class_name + "_cp.html#cp" + index +
"\" TARGET=ConstantPool>" + str + "</A>";
}
static final String referenceType(String type) {
String short_type = Utility.compactClassName(type);
short_type = Utility.compactClassName(short_type, class_package + ".", true);
int index = type.indexOf('['); // Type is an array?
if(index > -1)
type = type.substring(0, index); // Tack of the `['
// test for basic type
if(type.equals("int") || type.equals("short") || type.equals("boolean") || type.equals("void") ||
type.equals("char") || type.equals("byte") || type.equals("long") || type.equals("double") ||
type.equals("float"))
return "<FONT COLOR=\"#00FF00\">" + type + "";
else
return "<A HREF=\"" + type + ".html\" TARGET=_top>" + short_type + "";
}
static String toHTML(String str) {
StringBuffer buf = new StringBuffer();
try { // Filter any characters HTML doesn't like such as < and > in particular
for(int i=0; i < str.length(); i++) {
char ch;
switch(ch=str.charAt(i)) {
case '<': buf.append("<"); break;
case '>': buf.append(">"); break;
case '\n': buf.append("\\n"); break;
case '\r': buf.append("\\r"); break;
default: buf.append(ch);
}
}
} catch(StringIndexOutOfBoundsException e) {} // Never occurs
return buf.toString();
}
private void writeMainHTML(AttributeHTML attribute_html) throws IOException {
PrintWriter file = new PrintWriter(new FileOutputStream(dir + class_name + ".html"));
Attribute[] attributes = java_class.getAttributes();
file.println("<HTML>\n" + "
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