vmabstractclassloader.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 66 行

/*
 * $Id: VmAbstractClassLoader.java,v 1.3 2004/02/20 08:21:02 epr Exp $
 */
package org.jnode.vm;

import java.security.ProtectionDomain;

import org.jnode.vm.classmgr.ClassDecoder;
import org.jnode.vm.classmgr.SelectorMap;
import org.jnode.vm.classmgr.VmClassLoader;
import org.jnode.vm.classmgr.VmType;

/**
 * @author Ewout Prangsma ([e-mail])
 */
abstract class VmAbstractClassLoader extends VmClassLoader {

	/**
	 * @see org.jnode.vm.classmgr.VmClassLoader#defineClass(java.lang.String, byte[], int, int, java.security.ProtectionDomain)
	 */
	public final VmType defineClass(String name, byte[] data, int offset, int length, ProtectionDomain protDomain) {
		VmType vmClass = ClassDecoder.defineClass(name, data, offset, length, true, this);
		name = vmClass.getName();
		if (!isSystemClassLoader()) {
			if (name.startsWith("org.jnode.vm") || name.startsWith("java.lang")) {
				throw new SecurityException("Only the system classloader can load this class");
			}
		}
		addLoadedClass(name, vmClass);
		return vmClass;
	}
	
	/**
	 * Load an array class with a given name
	 * 
	 * @param name
	 * @param resolve
	 * @return VmClass
	 * @throws ClassNotFoundException
	 */
	protected final VmType loadArrayClass(String name, boolean resolve) throws ClassNotFoundException {
		VmType compType;
		String compName = name.substring(1);
		if ((compName.charAt(0) == 'L') && (compName.charAt(compName.length() - 1) == ';')) {
			compName = compName.substring(1, compName.length() - 1);
			compType = loadClass(compName, resolve);
			return compType.getArrayClass();
		} else if (compName.charAt(0) == '[') {
			compType = loadClass(compName, resolve);
			return compType.getArrayClass();
		} else {
			return VmType.getPrimitiveArrayClass(compName.charAt(0));
		}
	}

	protected abstract SelectorMap getSelectorMap();

	/**
	 * Add a class that has been loaded.
	 * 
	 * @param name
	 * @param cls
	 */
	public abstract void addLoadedClass(String name, VmType cls);
}