File	Doc	Category	Size	Date	Package
JasperLoader.java	API Doc	Glassfish v2 API	10246	Fri May 04 22:32:58 BST 2007	org.apache.jasper.servlet

JasperLoader

• java.lang.Object
  • java.lang.ClassLoader
    • java.security.SecureClassLoader
      • java.net.URLClassLoader

Fields Summary
private PermissionCollection	permissionCollection
private CodeSource	codeSource
private ClassLoader	parent
private SecurityManager	securityManager
private Map	bytecodes

Constructors Summary
public JasperLoader(URL[] urls, ClassLoader parent, PermissionCollection permissionCollection, CodeSource codeSource, Map bytecodes) super(urls, parent); this.permissionCollection = permissionCollection; this.codeSource = codeSource; this.parent = parent; this.securityManager = System.getSecurityManager(); this.bytecodes = bytecodes;

Methods Summary
public java.lang.Class	findClass(java.lang.String className) // If the class file is in memory, use it byte[] cdata = this.bytecodes.get(className); String path = className.replace('.", '/") + ".class"; if (cdata == null) { // If the bytecode preprocessor is not enabled, use super.findClass // as usual. if (!PreprocessorUtil.isPreprocessorEnabled()) { return super.findClass(className); } // read class data from file cdata = loadClassDataFromFile(path); if (cdata == null) { throw new ClassNotFoundException(className); } } // Preprocess the loaded byte code if (PreprocessorUtil.isPreprocessorEnabled()) { cdata = PreprocessorUtil.processClass(path, cdata); } Class clazz = null; if (securityManager != null) { ProtectionDomain pd = new ProtectionDomain(codeSource, permissionCollection); clazz = defineClass(className, cdata, 0, cdata.length, pd); } else { clazz = defineClass(className, cdata, 0, cdata.length); } return clazz;
public final java.security.PermissionCollection	getPermissions(java.security.CodeSource codeSource) Get the Permissions for a CodeSource. Since this ClassLoader is only used for a JSP page in a web application context, we just return our preset PermissionCollection for the web app context. param codeSource Code source where the code was loaded from return PermissionCollection for CodeSource return permissionCollection;
public java.lang.Class	loadClass(java.lang.String name) Load the class with the specified name. This method searches for classes in the same manner as loadClass(String, boolean) with false as the second argument. param name Name of the class to be loaded exception ClassNotFoundException if the class was not found return (loadClass(name, false));
public java.lang.Class	loadClass(java.lang.String name, boolean resolve) Load the class with the specified name, searching using the following algorithm until it finds and returns the class. If the class cannot be found, returns ClassNotFoundException. Call findLoadedClass(String) to check if the class has already been loaded. If it has, the same Class object is returned. If the delegate property is set to true, call the loadClass() method of the parent class loader, if any. Call findClass() to find this class in our locally defined repositories. Call the loadClass() method of our parent class loader, if any. If the class was found using the above steps, and the resolve flag is true, this method will then call resolveClass(Class) on the resulting Class object. param name Name of the class to be loaded param resolve If true then resolve the class exception ClassNotFoundException if the class was not found Class clazz = null; // (0) Check our previously loaded class cache clazz = findLoadedClass(name); if (clazz != null) { if (resolve) resolveClass(clazz); return (clazz); } // (.5) Permission to access this class when using a SecurityManager if (securityManager != null) { int dot = name.lastIndexOf('."); if (dot >= 0) { try { // Do not call the security manager since by default, we grant that package. if (!"org.apache.jasper.runtime".equalsIgnoreCase(name.substring(0,dot))){ securityManager.checkPackageAccess(name.substring(0,dot)); } } catch (SecurityException se) { String error = "Security Violation, attempt to use " + "Restricted Class: " + name; se.printStackTrace(); throw new ClassNotFoundException(error); } } } if( !name.startsWith(Constants.JSP_PACKAGE_NAME) ) { // Class is not in org.apache.jsp, therefore, have our // parent load it clazz = parent.loadClass(name); if( resolve ) resolveClass(clazz); return clazz; } return findClass(name);
private byte[]	loadClassDataFromFile(java.lang.String fileName) byte[] classBytes = null; try { InputStream in = null; if (SecurityUtil.isPackageProtectionEnabled()){ in = (InputStream)AccessController.doPrivileged( new PrivilegedAction(){ public Object run(){ return getResourceAsStream(fileName); } }); } else { in = getResourceAsStream(fileName); } if (in == null) { return null; } ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte buf[] = new byte[1024]; for (int i = 0; (i = in.read(buf)) != -1; ) { baos.write(buf, 0, i); } in.close(); baos.close(); classBytes = baos.toByteArray(); } catch(Exception ex) { ex.printStackTrace(); return null; } return classBytes;