javaclass.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 818 行 · 第 1/2 页

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.bytecode;

import com.caucho.vfs.ReadStream;
import com.caucho.vfs.Vfs;
import com.caucho.vfs.WriteStream;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Represents a java class.
 */
public class JavaClass extends JClass {
  static private final Logger log
    = Logger.getLogger(JavaClass.class.getName());

  public static final int MAGIC = 0xcafebabe;

  public static final int ACC_PUBLIC    = 0x0001;
  public static final int ACC_PRIVATE   = 0x0002;
  public static final int ACC_PROTECTED = 0x0004;
  public static final int ACC_STATIC    = 0x0008;
  public static final int ACC_FINAL     = 0x0010;
  public static final int ACC_SUPER     = 0x0020;

  private JavaClassLoader _loader;

  private URL _url;

  private int _major;
  private int _minor;

  private ConstantPool _constantPool = new ConstantPool();
  
  private int _accessFlags;

  private String _thisClass;
  private String _superClass;

  private ArrayList<String> _interfaces = new ArrayList<String>();
  
  private ArrayList<JavaField> _fields = new ArrayList<JavaField>();
  
  private ArrayList<JavaMethod> _methods = new ArrayList<JavaMethod>();
  
  private ArrayList<Attribute> _attributes = new ArrayList<Attribute>();
  
  private JavaAnnotation []_annotations;

  private boolean _isWrite;

  public JavaClass(JavaClassLoader loader)
  {
    if (loader == null)
      throw new NullPointerException();
    
    _loader = loader;
  }

  /**
   * Returns the loader.
   */
  public JavaClassLoader getClassLoader()
  {
    return _loader;
  }

  public void setWrite(boolean isWrite)
  {
    _isWrite = isWrite;
  }

  /**
   * Sets the URL.
   */
  public void setURL(URL url)
  {
    _url = url;
  }

  /**
   * Sets the major identifier of the class file.
   */
  public void setMajor(int major)
  {
    _major = major;
  }

  /**
   * Gets the major identifier of the class file.
   */
  public int getMajor()
  {
    return _major;
  }

  /**
   * Sets the minor identifier of the class file.
   */
  public void setMinor(int minor)
  {
    _minor = minor;
  }

  /**
   * Gets the minor identifier of the class file.
   */
  public int getMinor()
  {
    return _minor;
  }

  /**
   * Returns the class's constant pool.
   */
  public ConstantPool getConstantPool()
  {
    return _constantPool;
  }

  /**
   * Sets the access flags.
   */
  public void setAccessFlags(int flags)
  {
    _accessFlags = flags;
  }

  /**
   * Gets the access flags.
   */
  public int getAccessFlags()
  {
    lazyLoad();
    
    return _accessFlags;
  }

  /**
   * Sets this class.
   */
  public void setThisClass(String className)
  {
    _thisClass = className;

    if (_isWrite)
      getConstantPool().addClass(className);
  }

  /**
   * Gets this class name.
   */
  public String getThisClass()
  {
    return _thisClass;
  }

  /**
   * Sets the super class.
   */
  public void setSuperClass(String className)
  {
    _superClass = className;

    getConstantPool().addClass(className);
  }

  /**
   * Gets the super class name.
   */
  public String getSuperClassName()
  {
    lazyLoad();
    
    return _superClass;
  }

  /**
   * Gets the super class name.
   */
  public JClass getSuperClass()
  {
    lazyLoad();
    
    if (_superClass == null)
      return null;
    else
      return getClassLoader().forName(_superClass.replace('/', '.'));
  }

  /**
   * Returns true for a final class.
   */
  public boolean isFinal()
  {
    return Modifier.isFinal(getAccessFlags());
  }

  /**
   * Returns true for an abstract class.
   */
  public boolean isAbstract()
  {
    return Modifier.isAbstract(getAccessFlags());
  }

  /**
   * Returns true for a public class.
   */
  public boolean isPublic()
  {
    return Modifier.isPublic(getAccessFlags());
  }

  /**
   * Returns true for a primitive class.
   */
  public boolean isPrimitive()
  {
    return false;
  }

  /**
   * Adds an interface.
   */
  public void addInterface(String className)
  {
    _interfaces.add(className);

    if (_isWrite)
      getConstantPool().addClass(className);
  }

  /**
   * Adds an interface.
   */
  public ArrayList<String> getInterfaceNames()
  {
    return _interfaces;
  }

  /**
   * Gets the interfaces.
   */
  public JClass []getInterfaces()
  {
    lazyLoad();
    
    JClass []interfaces = new JClass[_interfaces.size()];

    for (int i = 0; i < _interfaces.size(); i++) {
      String name = _interfaces.get(i);
      name = name.replace('/', '.');
      
      interfaces[i] = getClassLoader().forName(name);
    }
    
    return interfaces;
  }

  /**
   * Adds a field
   */
  public void addField(JavaField field)
  {
    _fields.add(field);
  }

  public JavaField createField(String name, String descriptor)
  {
    if (! _isWrite)
      throw new IllegalStateException("create field requires write");

    JavaField jField = new JavaField();
    jField.setWrite(true);
    jField.setJavaClass(this);

    jField.setName(name);
    jField.setDescriptor(descriptor);

    _fields.add(jField);

    return jField;
  }

  /**
   * Returns the fields.
   */
  public ArrayList<JavaField> getFieldList()
  {
    lazyLoad();
    
    return _fields;
  }

  /**
   * Returns a fields.
   */
  public JavaField getField(String name)
  {
    ArrayList<JavaField> fieldList = getFieldList();
    
    for (int i = 0; i < fieldList.size(); i++) {
      JavaField field = fieldList.get(i);

      if (field.getName().equals(name))
	return field;
    }

    return null;
  }

  /**
   * Adds a method
   */
  public void addMethod(JavaMethod method)
  {
    _methods.add(method);
  }

  public JavaMethod createMethod(String name, String descriptor)
  {
    if (! _isWrite)
      throw new IllegalStateException("create method requires write");

    JavaMethod jMethod = new JavaMethod();
    jMethod.setWrite(true);
    jMethod.setJavaClass(this);

    jMethod.setName(name);
    jMethod.setDescriptor(descriptor);

    _methods.add(jMethod);

    return jMethod;
  }

  /**
   * Returns the methods.
   */
  public ArrayList<JavaMethod> getMethodList()
  {
    lazyLoad();
    
    return _methods;
  }

  /**
   * Returns true for an array.
   */
  public boolean isArray()
  {
    return false;
  }

  /**
   * Returns true for an interface.
   */
  public boolean isInterface()
  {
    lazyLoad();
    
    return Modifier.isInterface(_accessFlags);
  }

  /**
   * Returns a method.
   */
  public JavaMethod getMethod(String name)
  {
    ArrayList<JavaMethod> methodList = getMethodList();
    
    for (int i = 0; i < methodList.size(); i++) {
      JavaMethod method = methodList.get(i);