ホワット・ア・ワンダフル・ワールド JAVA/VM

import javax.swing.JFrame;
import javax.vecmath.Point3d;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.BoundingSphere;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
import com.sun.j3d.utils.behaviors.mouse.MouseTranslate;

public class T extends JFrame {
  public T() {
    getContentPane().setLayout(new BorderLayout());
    GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
    Canvas3D canvas = new Canvas3D(config);
    getContentPane().add(canvas, BorderLayout.CENTER);
    OrbitBehavior orbit = new OrbitBehavior(canvas, OrbitBehavior.REVERSE_ALL);
    orbit.setSchedulingBounds(new BoundingSphere(new Point3d(0, 0, 0), 100.0));
    SimpleUniverse universe = new SimpleUniverse(canvas);
    universe.getViewingPlatform().setNominalViewingTransform();
    universe.getViewingPlatform().setViewPlatformBehavior(orbit);
    BranchGroup root = new BranchGroup();
    TransformGroup tg = new TransformGroup();
    root.addChild(tg);
    tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    MouseTranslate trans = new MouseTranslate(tg);
    BoundingSphere bounds = new BoundingSphere();
    bounds.setRadius(5.0);
    trans.setSchedulingBounds(bounds);
    tg.addChild(trans);
    root.addChild(new ColorCube(0.1));
    root.compile();
    universe.addBranchGraph(root);
  }
  public static void main(String[] args) {
    T t = new T();
    t.setBounds(10, 10, 400, 400);
    t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    t.setVisible(true);
  }
}

~/work/java/j3d$ ~/jdk1.6.0_05/bin/javac T.java
~/work/java/j3d$ ~/jdk1.6.0_05/bin/java -cp . T
Java 3D WARNING : reported GLX version = 1.2
GLX version 1.3 or higher is required
The reported version number may be incorrect. There is a known
ATI driver bug in glXQueryVersion that incorrectly reports the GLX
version as 1.2 when it really is 1.3, so Java 3D will attempt to
run anyway.
JAVA 3D: OpenGL 1.2 detected; will run with reduced functionality

~/work/java/j3d/j3d-examples$ ant
Buildfile: build.xml

init:

init-compile:

compile:
[javac] Compiling 148 source files to /home/aloha/work/java/j3d/j3d-examples/build/classes
[javac] 注:一部の入力ファイルは推奨されない API を使用またはオーバーライドしています。
[javac] 注:詳細については、-Xlint:deprecation オプションを指定して再コンパイルしてください。
[javac] 注:入力ファイルの操作のうち、未チェックまたは安全ではないものがあります。
[javac] 注:詳細については、-Xlint:unchecked オプションを指定して再コンパイルしてください。
[copy] Copying 48 files to /home/aloha/work/java/j3d/j3d-examples/build/classes/org/jdesktop/j3d/examples/resources
[copy] Copying 44 files to /home/aloha/work/java/j3d/j3d-examples/build/classes/org/jdesktop/j3d/examples

jar:
[mkdir] Created dir: /home/aloha/work/java/j3d/j3d-examples/dist
[jar] Building jar: /home/aloha/work/java/j3d/j3d-examples/dist/j3d-examples.jar

BUILD SUCCESSFUL
Total time: 7 seconds

Java 3D WARNING : reported GLX version = 1.2
GLX version 1.3 or higher is required
The reported version number may be incorrect. There is a known
ATI driver bug in glXQueryVersion that incorrectly reports the GLX
version as 1.2 when it really is 1.3, so Java 3D will attempt to
run anyway.
JAVA 3D: OpenGL 1.2 detected; will run with reduced functionality

追記 : ちょっと冗長なところをはぶいた


import java.io.*;
import java.io.FileInputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.DOMImplementation;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

public class ClassFileDumper {
  public static void main(String[] args) throws Exception {
    try {
      // class ファイルを ByteBuffer に丸ごと読みこむ
      FileInputStream is = new FileInputStream(args[0]);
      FileChannel channel = is.getChannel();
      ByteBuffer buffer = ByteBuffer.allocate((int)channel.size());
      channel.read(buffer);
      is.close();
      channel.close();
      buffer.order(java.nio.ByteOrder.BIG_ENDIAN);
      buffer.rewind();
      // DOM の初期化
      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      DocumentBuilder builder = factory.newDocumentBuilder();
      DOMImplementation domImpl = builder.getDOMImplementation();
      Document document = domImpl.createDocument("", "ClassFile", null);
      TransformerFactory transFactory = TransformerFactory.newInstance();
      Transformer transformer = transFactory.newTransformer();

      Element ClassFile = document.getDocumentElement();

      int magic = buffer.getInt();
      Element magicElm = document.createElement("magic");
      magicElm.appendChild(document.createTextNode(Integer.toString(magic)));
      ClassFile.appendChild(magicElm);

      short minor_version = buffer.getShort();
      Element minorElm = document.createElement("minor_version");
      minorElm.appendChild(document.createTextNode(Integer.toString(minor_version)));
      ClassFile.appendChild(minorElm);

      short major_version = buffer.getShort();
      Element majorElm = document.createElement("major_version");
      majorElm.appendChild(document.createTextNode(Integer.toString(major_version)));
      ClassFile.appendChild(majorElm);

      short constant_pool_count = buffer.getShort();
      Element cpcElm = document.createElement("constant_pool_count");
      cpcElm.appendChild(document.createTextNode(Integer.toString(constant_pool_count)));
      ClassFile.appendChild(cpcElm);
      Element constant_pool = document.createElement("constant_pool");
      for(int i = 1; i < constant_pool_count; i++) {
        Element e = readConstantPoolEntry(buffer, document);
        e.setAttribute("constant_pool_index", Integer.toString(i));
        constant_pool.appendChild(e);
      }
      ClassFile.appendChild(constant_pool);

      // DOM を System.out に出力
      transformer.setOutputProperty(javax.xml.transform.OutputKeys.METHOD, "xml");
      transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
      transformer.setOutputProperty(javax.xml.transform.OutputKeys.INDENT, "yes");
      DOMSource source = new DOMSource(document);
      transformer.transform(source, new StreamResult(System.out));
    } catch (ArrayIndexOutOfBoundsException e) {
      System.out.println("usage : java ClassFileDumper hoge.class");
    } catch (FileNotFoundException e) {
      System.out.println("No such class file.");
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
  static Element readConstantPoolEntry(ByteBuffer buffer, Document document) {
    byte tag = buffer.get();
    Element entry = document.createElement(CONSTANT_INFO_NAME[tag]);
    Element tagElm = document.createElement("tag");
    tagElm.appendChild(document.createTextNode(Integer.toString(tag)));
    entry.appendChild(tagElm);
    switch(tag) {
      case CONSTANT_Utf8 :{
        short length = buffer.getShort();
        byte[] bytes = new byte[length];
        buffer.get(bytes, 0, length);
        Element lengthElm = document.createElement("length");
        lengthElm.appendChild(document.createTextNode(Integer.toString(length)));
        entry.appendChild(lengthElm);
        Element bytesElm = document.createElement("bytes");
        bytesElm.appendChild(document.createTextNode(new String(bytes)));
        entry.appendChild(bytesElm);
        break;
      }
      case CONSTANT_Integer :{
        int  val = buffer.getInt();
        Element valElm = document.createElement("int");
        valElm.appendChild(document.createTextNode(Integer.toString(val)));
        entry.appendChild(valElm);
        break;
      }
      case CONSTANT_Float :{
        float  val = buffer.getFloat();
        Element valElm = document.createElement("float");
        valElm.appendChild(document.createTextNode(Float.toString(val)));
        entry.appendChild(valElm);
        break;
      }
      case CONSTANT_Long :{
        long  val = buffer.getLong();
        Element valElm = document.createElement("long");
        valElm.appendChild(document.createTextNode(Long.toString(val)));
        entry.appendChild(valElm);
        break;
      }
      case CONSTANT_Double :{
        double  val = buffer.getInt();
        Element valElm = document.createElement("double");
        valElm.appendChild(document.createTextNode(Double.toString(val)));
        entry.appendChild(valElm);
        break;
      }
      case CONSTANT_Class :{
        short name_index = buffer.getShort();
        Element name_indexElm = document.createElement("name_index");
        name_indexElm.appendChild(document.createTextNode(Integer.toString(name_index)));
        entry.appendChild(name_indexElm);
        break;
      }
      case CONSTANT_String :{
        short string_index = buffer.getShort();
        Element string_indexElm = document.createElement("string_index");
        string_indexElm.appendChild(document.createTextNode(Integer.toString(string_index)));
        entry.appendChild(string_indexElm);
        break;
      }
      case CONSTANT_Fieldref :
      case CONSTANT_Methodref :
      case CONSTANT_InterfaceMethodref :{
        short class_index = buffer.getShort();
        short name_and_type_index = buffer.getShort();
        Element class_indexElm = document.createElement("class_index");
        class_indexElm.appendChild(document.createTextNode(Integer.toString(class_index)));
        entry.appendChild(class_indexElm);
        Element name_and_type_indexElm = document.createElement("name_and_type_index");
        name_and_type_indexElm.appendChild(document.createTextNode(Integer.toString(name_and_type_index)));
        entry.appendChild(name_and_type_indexElm);
        break;
      }
      case CONSTANT_NameAndType :{
        short name_index = buffer.getShort();
        short descriptor_index = buffer.getShort();
        Element name_indexElm = document.createElement("name_index");
        name_indexElm.appendChild(document.createTextNode(Integer.toString(name_index)));
        entry.appendChild(name_indexElm);
        Element descriptor_indexElm = document.createElement("descriptor_index");
        descriptor_indexElm.appendChild(document.createTextNode(Integer.toString(descriptor_index)));
        entry.appendChild(descriptor_indexElm);
        break;
      }
      default :
        System.out.println("Invalid data tag : " + tag);
        System.exit(-1);
    }
    return entry;
  }
  private final static byte CONSTANT_Utf8               = 0x01;
  private final static byte CONSTANT_Integer            = 0x03;
  private final static byte CONSTANT_Float              = 0x04;
  private final static byte CONSTANT_Long               = 0x05;
  private final static byte CONSTANT_Double             = 0x06;
  private final static byte CONSTANT_Class              = 0x07;
  private final static byte CONSTANT_String             = 0x08;
  private final static byte CONSTANT_Fieldref           = 0x09;
  private final static byte CONSTANT_Methodref          = 0x0a;
  private final static byte CONSTANT_InterfaceMethodref = 0x0b;
  private final static byte CONSTANT_NameAndType        = 0x0c;
  private final static String[] CONSTANT_INFO_NAME = {
    null,
    "CONSTANT_Utf8_info",
    null,
    "CONSTANT_Integer_info",
    "CONSTANT_Float_info",
    "CONSTANT_Long_info",
    "CONSTANT_Double_info",
    "CONSTANT_Class_info",
    "CONSTANT_String_info",
    "CONSTANT_Fieldref_info",
    "CONSTANT_Methodref_info",
    "CONSTANT_InterfaceMethodref_info",
    "CONSTANT_NameAndType_info"
  };
}

私は知識に何ものかを付け加え，また他の人々がより多くのものを付け加える手助けをした --- G.H.ハーディ

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