/*
* $Header: /home/cvspublic/jakarta-tomcat/src/share/org/apache/jasper/runtime/JspLoader.java,v 1.2 1999/10/21 01:48:42 akv Exp $
* $Revision: 1.2 $
* $Date: 1999/10/21 01:48:42 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper.runtime;
import java.io.FileInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Vector;
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.jasper.JasperException;
import org.apache.jasper.Constants;
import org.apache.jasper.JspEngineContext;
import org.apache.jasper.Options;
import org.apache.jasper.compiler.Compiler;
/**
* This is a class loader that loads JSP files as though they were
* Java classes. It calls the compiler to compile the JSP file into a
* servlet and then loads the generated class.
*
* This code is quite fragile and needs careful
* treatment/handling/revisiting. I know this doesn't work very well
* right now for:
*
* (a) inner classes
* (b) does not work at all for tag handlers that have inner
* classes; but that is likely to change with the new JSP PR2
* spec.
*
* @author Anil K. Vijendran
* @author Harish Prabandham
*/
public class JspLoader extends ClassLoader {
Hashtable loadedJSPs = new Hashtable();
ClassLoader parent;
ServletContext context;
Options options;
JspLoader(ServletContext context,
ClassLoader cl, Options options)
{
// super(cl); // JDK 1.2 FIXME
super();
this.context = context;
this.parent = cl;
this.options = options;
}
public Class getJspServletClass(String name) {
return (Class) loadedJSPs.get(name);
}
protected synchronized Class loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
// First, check if the class has already been loaded
Class c = findLoadedClass(name);
if (c == null) {
try {
//System.out.println("JspLoader: parent = " + parent);
if (parent != null) {
c = parent.loadClass(name);
}
else {
c = findSystemClass(name);
}
} catch (ClassNotFoundException e) {
// If still not found, then call findClass in order
// to find the class.
try {
c = findClass(name);
} catch (ClassNotFoundException ex) {
throw ex;
}
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
protected Class findClass(String className) throws ClassNotFoundException {
try {
int beg = className.lastIndexOf(".") == -1 ? 0 :
className.lastIndexOf(".")+1;
int end = className.lastIndexOf("_jsp_");
if (end <= 0) { // this is a class that the JSP file depends on (example: class
// in a tag library)
byte[] classBytes = loadClassDataFromJar(className);
if (classBytes == null)
throw new ClassNotFoundException(className);
return defClass(className, classBytes);
} else {
String fileName = null;
String outputDir = options.scratchDir().toString();
if (className.indexOf('$', end) != -1) {
// this means we're loading an inner class
fileName = outputDir + File.separatorChar +
className.replace('.', File.separatorChar) + ".class";
} else {
fileName = className.substring(beg, end) + ".class";
fileName = outputDir + File.separatorChar + fileName;
}
FileInputStream fin = new FileInputStream(fileName);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte buf[] = new byte[1024];
for(int i = 0; (i = fin.read(buf)) != -1; )
baos.write(buf, 0, i);
fin.close();
baos.close();
byte[] classBytes = baos.toByteArray();
return defClass(className, classBytes);
}
} catch (Exception ex) {
throw new ClassNotFoundException(Constants.getString(
"jsp.error.unable.loadclass",
new Object[] {className}));
}
}
/**
* Just a short hand for defineClass now... I suspect we might need to
* make this public at some point of time.
*/
private final Class defClass(String className, byte[] classData) {
return defineClass(className, classData, 0, classData.length);
}
/* Check if we need to reload a JSP page.
*
* Side-effect: re-compile the JSP page.
*
* @param classpath explicitly set the JSP compilation path.
* @return true if JSP files is newer
*/
public boolean loadJSP(String name, String classpath, boolean isErrorPage,
HttpServletRequest req, HttpServletResponse res)
throws JasperException, FileNotFoundException
{
Class jspClass = (Class) loadedJSPs.get(name);
boolean firstTime = jspClass == null;
JspEngineContext ctxt = new JspEngineContext(this, classpath,
context, name,
isErrorPage, options,
req, res);
boolean outDated = false;
Compiler compiler = ctxt.createCompiler();
try {
outDated = compiler.compile();
} catch (FileNotFoundException ex) {
throw ex;
} catch (JasperException ex) {
throw ex;
} catch (Exception ex) {
throw new JasperException(Constants.getString("jsp.error.unable.compile"),
ex);
}
// Reload only if it's outdated
if((jspClass == null) || outDated) {
try {
jspClass = loadClass(ctxt.getFullClassName(), true);
} catch (ClassNotFoundException cex) {
throw new JasperException(Constants.getString("jsp.error.unable.load"),
cex);
}
loadedJSPs.put(name, jspClass);
}
return outDated;
}
private Vector jars = new Vector();
private byte[] loadClassDataFromJar(String className) {
String entryName = className.replace('.','/')+".class";
InputStream classStream = null;
for(int i = 0; i < jars.size(); i++) {
File thisFile = new File((String) jars.elementAt(i));
try {
// check if it exists...
if (!thisFile.exists())
return null;
if (thisFile.isFile()) {
ZipFile zip = new ZipFile(thisFile);
ZipEntry entry = zip.getEntry(entryName);
if (entry != null) {
classStream = zip.getInputStream(entry);
byte[] classData = getClassData(classStream);
zip.close();
return classData;
} else {
zip.close();
}
} else { // its a directory...
File classFile = new File(thisFile,
entryName.replace('/', File.separatorChar));
if (classFile.exists()) {
classStream = new FileInputStream(classFile);
byte[] classData = getClassData(classStream);
classStream.close();
return classData;
}
}
} catch (IOException ioe) {
return null;
}
}
return null;
}
private byte[] getClassData(InputStream istream) throws IOException {
byte[] buf = new byte[1024];
ByteArrayOutputStream bout = new ByteArrayOutputStream();
int num = 0;
while((num = istream.read(buf)) != -1) {
bout.write(buf, 0, num);
}
return bout.toByteArray();
}
public void addJar(String jarFileName) throws IOException {
if (!jars.contains(jarFileName)) {
Constants.message("jsp.message.adding_jar",
new Object[] { jarFileName },
Constants.MED_VERBOSITY);
jars.addElement(jarFileName);
}
}
public String getClassPath() {
StringBuffer cpath = new StringBuffer();
String sep = System.getProperty("path.separator");
for(int i = 0; i < jars.size(); i++) {
cpath.append((String)jars.elementAt(i)+sep);
}
return cpath.toString();
}
}