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JavaRunnerLoader.javaAPI DocExample3254Tue Jan 05 17:56:30 GMT 1999None

JavaRunnerLoader

public class JavaRunnerLoader extends SecureClassLoader

Fields Summary
protected URL
urlBase
public boolean
printLoadMessages
Constructors Summary
public JavaRunnerLoader(String base, ClassLoader parent)


	     
		super(parent);
		try {
			if (!(base.endsWith("/")))
				base = base + "/";
			urlBase = new URL(base);
		} catch (Exception e) {
			throw new IllegalArgumentException(base);
		}
Methods Summary
public voidcheckPackageAccess(java.lang.String name)

		SecurityManager sm = System.getSecurityManager();
		if (sm != null)
			sm.checkPackageAccess(name);
protected java.lang.ClassfindClass(java.lang.String name)

		String urlName = name.replace('.", '/");
		byte buf[];
		Class cl;

		SecurityManager sm = System.getSecurityManager();
		if (sm != null) {
			int i = name.lastIndexOf('.");
			if (i >= 0)
				sm.checkPackageDefinition(name.substring(0, i));
		}
		try {
			URL url = new URL(urlBase, urlName + ".class");
			if (printLoadMessages)
				System.out.println("Loading " + url);
			InputStream is = url.openConnection().getInputStream();
			buf = getClassBytes(is);
			// Starting in 1.2 beta 4, we no longer use a code source in
			// this example
			// CodeSource cs = getCodeSource(urlBase, null);
			// cl = defineClass(name, buf, 0, buf.length, cs, null);
			cl = defineClass(name, buf, 0, buf.length);
			return cl;
		} catch (Exception e) {
			System.out.println("Can't load " + name + ": " + e);
			return null;
		}
byte[]getClassBytes(java.io.InputStream is)

		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		BufferedInputStream bis = new BufferedInputStream(is);
		boolean eof = false;
		while (!eof) {
			try {
				int i = bis.read();
				if (i == -1)
					eof = true;
				else baos.write(i);
			} catch (IOException e) {
				return null;
			}
		}
		return baos.toByteArray();