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* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
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package org.apache.jasper;
import java.io.File;
import java.io.FileNotFoundException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.concurrent.ConcurrentHashMap;
import java.util.Set;
import javax.servlet.ServletContext;
import javax.servlet.jsp.tagext.TagInfo;
import javax.servlet.jsp.tagext.TagLibraryInfo;
import org.apache.jasper.compiler.Compiler;
import org.apache.jasper.compiler.JspRuntimeContext;
import org.apache.jasper.compiler.JspUtil;
import org.apache.jasper.compiler.Localizer;
import org.apache.jasper.compiler.ServletWriter;
import org.apache.jasper.compiler.TagLibraryInfoImpl;
import org.apache.jasper.servlet.JasperLoader;
import org.apache.jasper.servlet.JspServletWrapper;
/**
* A place holder for various things that are used through out the JSP
* engine. This is a per-request/per-context data structure. Some of
* the instance variables are set at different points.
*
* Most of the path-related stuff is here - mangling names, versions, dirs,
* loading resources and dealing with uris.
*
* @author Anil K. Vijendran
* @author Harish Prabandham
* @author Pierre Delisle
* @author Costin Manolache
* @author Kin-man Chung
*/
public class JspCompilationContext {
private boolean isPackagedTagFile;
private String className;
private String jspUri;
private boolean isErrPage;
private String basePackageName;
private String derivedPackageName;
private String servletJavaFileName;
private String javaPath;
private String classFileName;
private String contentType;
private ServletWriter writer;
private Options options;
private JspServletWrapper jsw;
private Compiler jspCompiler;
private String classPath;
private String baseURI;
private String outputDir;
private ServletContext context;
private URLClassLoader loader;
private JspRuntimeContext rctxt;
private int removed = 0;
private URL baseUrl;
private Class servletClass;
private boolean isTagFile;
private boolean protoTypeMode;
private TagInfo tagInfo;
private URL tagFileJarUrl;
private ConcurrentHashMap taglibs;
private ConcurrentHashMap tagFileJarUrls;
// jspURI _must_ be relative to the context
public JspCompilationContext(String jspUri,
boolean isErrPage,
Options options,
ServletContext context,
JspServletWrapper jsw,
JspRuntimeContext rctxt)
throws JasperException {
this.jspUri = canonicalURI(jspUri);
this.isErrPage = isErrPage;
this.options = options;
this.jsw = jsw;
this.context = context;
this.baseURI = jspUri.substring(0, jspUri.lastIndexOf('/') + 1);
// hack fix for resolveRelativeURI
if (baseURI == null) {
baseURI = "/";
} else if (baseURI.charAt(0) != '/') {
// strip the basde slash since it will be combined with the
// uriBase to generate a file
baseURI = "/" + baseURI;
}
if (baseURI.charAt(baseURI.length() - 1) != '/') {
baseURI += '/';
}
this.rctxt = rctxt;
this.basePackageName = Constants.JSP_PACKAGE_NAME;
taglibs = (ConcurrentHashMap)
context.getAttribute(Constants.JSP_TAGLIBRARY_CACHE);
tagFileJarUrls = (ConcurrentHashMap)
context.getAttribute(Constants.JSP_TAGFILE_JAR_URLS_CACHE);
}
public JspCompilationContext(String tagfile,
TagInfo tagInfo,
Options options,
ServletContext context,
JspServletWrapper jsw,
JspRuntimeContext rctxt,
URL tagFileJarUrl)
throws JasperException {
this(tagfile, false, options, context, jsw, rctxt);
this.isTagFile = true;
this.tagInfo = tagInfo;
this.tagFileJarUrl = tagFileJarUrl;
if (tagFileJarUrl != null) {
isPackagedTagFile = true;
}
}
/* ==================== Methods to override ==================== */
/**
* Adds the given tag library with the given URI to the context-wide
* tag library cache.
*
* @param uri The tag library URI
* @param taglib The tag library to add
*/
public void addTaglib(String uri, TagLibraryInfoImpl taglib) {
taglibs.put(uri, taglib);
}
/**
* Gets the context-wide tag library cache.
*
* @return The context-wide tag library cache
*/
public ConcurrentHashMap getTaglibs() {
return taglibs;
}
/**
* Clears the context-wide tag library cache.
*/
public void clearTaglibs() {
taglibs.clear();
}
/**
* Clears the context-wide mappings from JAR packaged tag file paths to
* their corresponding URLs.
*/
public void clearTagFileJarUrls() {
tagFileJarUrls.clear();
}
/** ---------- Class path and loader ---------- */
/**
* The classpath that is passed off to the Java compiler.
*/
public String getClassPath() {
if( classPath != null )
return classPath;
return rctxt.getClassPath();
}
/**
* The classpath that is passed off to the Java compiler.
*/
public void setClassPath(String classPath) {
this.classPath = classPath;
}
/**
* What class loader to use for loading classes while compiling
* this JSP?
*/
public ClassLoader getClassLoader() {
if( loader != null )
return loader;
return rctxt.getParentClassLoader();
}
public void setClassLoader(URLClassLoader loader) {
this.loader = loader;
}
/** ---------- Input/Output ---------- */
/**
* The output directory to generate code into. The output directory
* is make up of the scratch directory, which is provide in Options,
* plus the directory derived from the package name.
*/
public String getOutputDir() {
if (outputDir == null) {
createOutputDir();
}
return outputDir;
}
/**
* Create a compiler object for parsing only.
*/
public Compiler createParser() throws JasperException {
jspCompiler = new Compiler(this, jsw);
return jspCompiler;
}
/**
* Create a "Compiler" object.
*/
public Compiler createCompiler(boolean jspcMode) throws JasperException {
if (jspCompiler != null ) {
return jspCompiler;
}
jspCompiler = new Compiler(this, jsw, jspcMode);
return jspCompiler;
}
public Compiler getCompiler() {
return jspCompiler;
}
/** ---------- Access resources in the webapp ---------- */
/**
* Get the full value of a URI relative to this compilations context
* uses current file as the base.
*/
public String resolveRelativeUri(String uri) {
// sometimes we get uri's massaged from File(String), so check for
// a root directory deperator char
if (uri.startsWith("/") || uri.startsWith(File.separator)) {
return uri;
} else {
return baseURI + uri;
}
}
/**
* Gets a resource as a stream, relative to the meanings of this
* context's implementation.
* @return a null if the resource cannot be found or represented
* as an InputStream.
*/
public java.io.InputStream getResourceAsStream(String res)
throws JasperException {
return context.getResourceAsStream(canonicalURI(res));
}
public URL getResource(String res) throws MalformedURLException {
try {
return context.getResource(canonicalURI(res));
} catch (JasperException ex) {
throw new MalformedURLException(ex.getMessage());
}
}
public Set getResourcePaths(String path)
throws JasperException {
return context.getResourcePaths(canonicalURI(path));
}
/**
* Gets the actual path of a URI relative to the context of
* the compilation.
*/
public String getRealPath(String path) {
if (context != null) {
return context.getRealPath(path);
}
return path;
}
/**
* Gets the context-wide mappings from JAR packaged tag file paths to
* their corresponfing URLs.
*/
public ConcurrentHashMap getTagFileJarUrls() {
return this.tagFileJarUrls;
}
/**
* Returns the JAR file in which the tag file for which this
* JspCompilationContext was created is packaged, or null if this
* JspCompilationContext does not correspond to a tag file, or if the
* corresponding tag file is not packaged in a JAR.
*/
public URL getTagFileJarUrl() {
return this.tagFileJarUrl;
}
/* ==================== Common implementation ==================== */
/**
* Just the class name (does not include package name) of the
* generated class.
*/
public String getServletClassName() {
if (className != null) {
return className;
}
if (isTagFile) {
className = tagInfo.getTagClassName();
int lastIndex = className.lastIndexOf('.');
if (lastIndex != -1) {
className = className.substring(lastIndex + 1);
}
} else {
int iSep = jspUri.lastIndexOf('/') + 1;
className = JspUtil.makeJavaIdentifier(jspUri.substring(iSep));
}
return className;
}
public void setServletClassName(String className) {
this.className = className;
}
/**
* Path of the JSP URI. Note that this is not a file name. This is
* the context rooted URI of the JSP file.
*/
public String getJspFile() {
return jspUri;
}
/**
* Are we processing something that has been declared as an
* errorpage?
*/
public boolean isErrorPage() {
return isErrPage;
}
public void setErrorPage(boolean isErrPage) {
this.isErrPage = isErrPage;
}
public boolean isTagFile() {
return isTagFile;
}
public TagInfo getTagInfo() {
return tagInfo;
}
public void setTagInfo(TagInfo tagi) {
tagInfo = tagi;
}
/**
* True if we are compiling a tag file in prototype mode.
* ie we only generate codes with class for the tag handler with empty
* method bodies.
*/
public boolean isPrototypeMode() {
return protoTypeMode;
}
public void setPrototypeMode(boolean pm) {
protoTypeMode = pm;
}
/**
* Package name for the generated class is make up of the base package
* name, which is user settable, and the derived package name. The
* derived package name directly mirrors the file heirachy of the JSP page.
*/
public String getServletPackageName() {
if (isTagFile()) {
String className = tagInfo.getTagClassName();
int lastIndex = className.lastIndexOf('.');
String pkgName = "";
if (lastIndex != -1) {
pkgName = className.substring(0, lastIndex);
}
return pkgName;
} else {
String dPackageName = getDerivedPackageName();
if (dPackageName.length() == 0) {
return basePackageName;
}
return basePackageName + '.' + getDerivedPackageName();
}
}
private String getDerivedPackageName() {
if (derivedPackageName == null) {
int iSep = jspUri.lastIndexOf('/');
derivedPackageName = (iSep > 0) ?
JspUtil.makeJavaPackage(jspUri.substring(1,iSep)) : "";
}
return derivedPackageName;
}
/**
* The package name into which the servlet class is generated.
*/
public void setServletPackageName(String servletPackageName) {
this.basePackageName = servletPackageName;
}
/**
* Full path name of the Java file into which the servlet is being
* generated.
*/
public String getServletJavaFileName() {
if (servletJavaFileName == null) {
servletJavaFileName =
getOutputDir() + getServletClassName() + ".java";
}
return servletJavaFileName;
}
/**
* Get hold of the Options object for this context.
*/
public Options getOptions() {
return options;
}
public ServletContext getServletContext() {
return context;
}
public JspRuntimeContext getRuntimeContext() {
return rctxt;
}
/**
* Full class name
*/
public String getFullClassName() {
if (isTagFile()) {
return tagInfo.getTagClassName();
}
return getServletPackageName() + '.' + getServletClassName();
}
/**
* Path of the Java file relative to the work directory.
*/
public String getJavaPath() {
if (javaPath != null) {
return javaPath;
}
javaPath = getFullClassName().replace('.','/') + ".java";
return javaPath;
}
public String getClassFileName() {
if (classFileName == null) {
classFileName = getOutputDir() + getServletClassName() + ".class";
}
return classFileName;
}
/**
* Get the content type of this JSP.
*
* Content type includes content type and encoding.
*/
public String getContentType() {
return contentType;
}
public void setContentType(String contentType) {
this.contentType = contentType;
}
/**
* Where is the servlet being generated?
*/
public ServletWriter getWriter() {
return writer;
}
public void setWriter(ServletWriter writer) {
this.writer = writer;
}
/**
* Gets the 'location' of the TLD associated with the given taglib 'uri'.
*
* @return An array of two Strings: The first element denotes the real
* path to the TLD. If the path to the TLD points to a jar file, then the
* second element denotes the name of the TLD entry in the jar file.
* Returns null if the given uri is not associated with any tag library
* 'exposed' in the web application.
*/
public String[] getTldLocation(String uri) throws JasperException {
String[] location =
getOptions().getTldLocationsCache().getLocation(uri);
return location;
}
/**
* Are we keeping generated code around?
*/
public boolean keepGenerated() {
return getOptions().getKeepGenerated();
}
// ==================== Removal ====================
public void incrementRemoved() {
if (removed > 1) {
jspCompiler.removeGeneratedFiles();
if( rctxt != null )
rctxt.removeWrapper(jspUri);
}
removed++;
}
public boolean isRemoved() {
if (removed > 1 ) {
return true;
}
return false;
}
// ==================== Compile and reload ====================
public void compile() throws JasperException, FileNotFoundException {
createCompiler(false);
if (isPackagedTagFile || jspCompiler.isOutDated()) {
try {
jspCompiler.compile(true);
jsw.setReload(true);
jsw.setCompilationException(null);
} catch (JasperException ex) {
// Cache compilation exception
jsw.setCompilationException(ex);
throw ex;
} catch (Exception ex) {
ex.printStackTrace();
JasperException je = new JasperException(
Localizer.getMessage("jsp.error.unable.compile"),
ex);
// Cache compilation exception
jsw.setCompilationException(je);
throw je;
}
}
}
// ==================== Manipulating the class ====================
public Class load()
throws JasperException
{
try {
String name = getFullClassName();
if (options.getUsePrecompiled()) {
servletClass = getClassLoader().loadClass(name);
} else {
servletClass = getJspLoader().loadClass(name);
}
} catch (ClassNotFoundException cex) {
throw new JasperException(
Localizer.getMessage("jsp.error.unable.load"), cex);
} catch (Exception ex) {
throw new JasperException(
Localizer.getMessage("jsp.error.unable.compile"), ex);
}
removed = 0;
return servletClass;
}
public ClassLoader getJspLoader() {
return new JasperLoader(new URL[] {baseUrl},
getClassLoader(),
rctxt.getPermissionCollection(),
rctxt.getCodeSource(),
rctxt.getBytecodes());
}
public void makeOutputDir() {
synchronized(outputDirLock) {
File outDirFile = new File(outputDir);
outDirFile.mkdirs();
}
}
// ==================== Private methods ====================
static Object outputDirLock = new Object();
private void createOutputDir() {
String path = null;
if (isTagFile()) {
String tagName = tagInfo.getTagClassName();
path = tagName.replace('.', '/');
path = path.substring(0, path.lastIndexOf('/'));
} else {
path = getServletPackageName().replace('.', '/');
}
try {
// Append servlet or tag handler path to scratch dir
baseUrl = options.getScratchDir().toURL();
File f = new File( options.getScratchDir(), path );
outputDir = f.getPath() + File.separator;
makeOutputDir();
} catch (Exception e) {
throw new IllegalStateException("No output directory: " +
e.getMessage());
}
}
private static final boolean isPathSeparator(char c) {
return (c == '/' || c == '\\');
}
private static final String canonicalURI(String s)
throws JasperException {
if (s == null) return null;
StringBuffer result = new StringBuffer();
final int len = s.length();
int pos = 0;
while (pos < len) {
char c = s.charAt(pos);
if ( isPathSeparator(c) ) {
/*
* multiple path separators.
* 'foo///bar' -> 'foo/bar'
*/
while (pos+1 < len && isPathSeparator(s.charAt(pos+1))) {
++pos;
}
if (pos+1 < len && s.charAt(pos+1) == '.') {
/*
* a single dot at the end of the path - we are done.
*/
if (pos+2 >= len) break;
switch (s.charAt(pos+2)) {
/*
* self directory in path
* foo/./bar -> foo/bar
*/
case '/':
case '\\':
pos += 2;
continue;
/*
* two dots in a path: go back one hierarchy.
* foo/bar/../baz -> foo/baz
*/
case '.':
// only if we have exactly _two_ dots.
if (pos+3 < len && isPathSeparator(s.charAt(pos+3))) {
pos += 3;
int separatorPos = result.length()-1;
if (separatorPos < 0) {
throw new JasperException(
Localizer.getMessage("jsp.error.badpath",s));
}
while (separatorPos >= 0 &&
! isPathSeparator(result
.charAt(separatorPos))) {
--separatorPos;
}
if (separatorPos >= 0)
result.setLength(separatorPos);
continue;
}
}
}
}
result.append(c);
++pos;
}
return result.toString();
}
}
