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/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jasper;
import org.apache.jasper.compiler.JspReader;
import org.apache.jasper.compiler.ServletWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.MalformedURLException;
import org.apache.jasper.compiler.Compiler;
import org.apache.jasper.servlet.JspServletWrapper;
import org.apache.jasper.servlet.JasperLoader;
import javax.servlet.ServletContext;
import org.apache.jasper.compiler.JspRuntimeContext;
/**
* 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
*/
public class JspCompilationContext {
protected String servletClassName;
protected String jspUri;
private boolean isErrPage;
protected String servletPackageName = Constants.JSP_PACKAGE_NAME;
protected String servletJavaFileName;
protected String jspPath;
protected String classFileName;
protected String contentType;
protected JspReader reader;
protected ServletWriter writer;
protected Options options;
protected JspServletWrapper jsw;
protected Compiler jspCompiler;
protected String classPath;
protected String baseURI;
protected String outputDir;
protected ServletContext context;
protected URLClassLoader loader;
protected JspRuntimeContext rctxt;
protected int removed = 0;
protected URLClassLoader jspLoader;
protected URL [] outUrls = new URL[1];
protected Class servletClass;
// jspURI _must_ be relative to the context
public JspCompilationContext(String jspUri, boolean isErrPage, Options options,
ServletContext context, JspServletWrapper jsw,
JspRuntimeContext rctxt) {
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;
}
/* ==================== Methods to override ==================== */
/** ---------- 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 scratch directory to generate code into.
*/
public String getOutputDir() {
return outputDir;
}
public void setOutputDir( String s ) {
this.outputDir=s;
}
/**
* Create a "Compiler" object based on some init param data. This
* is not done yet. Right now we're just hardcoding the actual
* compilers that are created.
*/
public Compiler createCompiler() throws JasperException {
if (jspCompiler != null ) {
return jspCompiler;
}
jspCompiler = new Compiler(this, jsw);
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) {
return context.getResourceAsStream(canonicalURI(res));
}
public URL getResource(String res) throws MalformedURLException {
return context.getResource(canonicalURI(res));
}
/**
* 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;
}
/* ==================== Common implementation ==================== */
/**
* Just the class name (does not include package name) of the
* generated class.
*/
public String getServletClassName() {
if (servletClassName != null) {
return servletClassName;
}
int iSep = jspUri.lastIndexOf('/') + 1;
int iEnd = jspUri.length();
StringBuffer modifiedClassName =
new StringBuffer(jspUri.length() - iSep);
if (!Character.isJavaIdentifierStart(jspUri.charAt(iSep))) {
// If the first char is not a legal Java letter or digit,
// prepend a '_'.
modifiedClassName.append('_');
}
for (int i = iSep; i < iEnd; i++) {
char ch = jspUri.charAt(i);
if (Character.isJavaIdentifierPart(ch)) {
modifiedClassName.append(ch);
} else if (ch == '.') {
modifiedClassName.append('_');
} else {
modifiedClassName.append(mangleChar(ch));
}
}
servletClassName = modifiedClassName.toString();
return servletClassName;
}
public void setServletClassName(String servletClassName) {
this.servletClassName = servletClassName;
}
/**
* 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;
}
/**
* Package name for the generated class.
*/
public String getServletPackageName() {
return servletPackageName;
}
/**
* The package name into which the servlet class is generated.
*/
public void setServletPackageName(String servletPackageName) {
this.servletPackageName = servletPackageName;
}
/**
* Full path name of the Java file into which the servlet is being
* generated.
*/
public String getServletJavaFileName() {
if (servletJavaFileName != null) {
return servletJavaFileName;
}
String outputDir = getOutputDir();
servletJavaFileName = getServletClassName() + ".java";
if (outputDir != null && !outputDir.equals("")) {
if( outputDir.endsWith("/" ) ) {
servletJavaFileName = outputDir + servletJavaFileName;
} else {
servletJavaFileName = outputDir + "/" + servletJavaFileName;
}
}
return servletJavaFileName;
}
public void setServletJavaFileName(String servletJavaFileName) {
this.servletJavaFileName = servletJavaFileName;
}
/**
* Get hold of the Options object for this context.
*/
public Options getOptions() {
return options;
}
/**
* Path of the JSP relative to the work directory.
*/
public String getJspPath() {
if (jspPath != null) {
return jspPath;
}
String dirName = getJspFile();
int pos = dirName.lastIndexOf('/');
if (pos > 0) {
dirName = dirName.substring(0, pos + 1);
} else {
dirName = "";
}
jspPath = dirName + getServletClassName() + ".java";
if (jspPath.startsWith("/")) {
jspPath = jspPath.substring(1);
}
return jspPath;
}
public String getClassFileName() {
if (classFileName != null) {
return classFileName;
}
String outputDir = getOutputDir();
classFileName = getServletClassName() + ".class";
if (outputDir != null && !outputDir.equals("")) {
classFileName = outputDir + File.separatorChar + classFileName;
}
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;
}
/**
* Get the input reader for the JSP text.
*/
public JspReader getReader() {
return reader;
}
public void setReader(JspReader reader) {
this.reader = reader;
}
/**
* Where is the servlet being generated?
*/
public ServletWriter getWriter() {
return writer;
}
public void setWriter(ServletWriter writer) {
this.writer = writer;
}
/**
* Get the 'location' of the TLD associated with
* a given taglib 'uri'.
*
* @return An array of two Strings. The first one is
* real path to the TLD. If the path to the TLD points
* to a jar file, then the second string is the
* name of the entry for the TLD in the jar file.
* Returns null if the uri is not associated to
* a tag library 'exposed' in the web application.
* A tag library is 'exposed' either explicitely in
* web.xml or implicitely via the uri tag in the TLD
* of a taglib deployed in a jar file (WEB-INF/lib).
*/
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();
if (jspCompiler.isOutDated()) {
try {
jspCompiler.compile();
jsw.setReload(true);
} catch (JasperException ex) {
throw ex;
} catch (Exception ex) {
throw new JasperException(
Constants.getString("jsp.error.unable.compile"),ex);
}
}
}
// ==================== Manipulating the class ====================
public Class load()
throws JasperException, FileNotFoundException
{
try {
jspLoader = new JasperLoader
(outUrls,
getServletPackageName() + "." + getServletClassName(),
rctxt.getParentClassLoader(),
rctxt.getPermissionCollection(),
rctxt.getCodeSource());
servletClass = jspLoader.loadClass(
getServletPackageName() + "." + getServletClassName());
} catch (ClassNotFoundException cex) {
throw new JasperException(
Constants.getString("jsp.error.unable.load"),cex);
} catch (Exception ex) {
throw new JasperException
(Constants.getString("jsp.error.unable.compile"), ex);
}
removed = 0;
return servletClass;
}
public void createOutdir() {
File outDirF = null;
try {
URL outURL = options.getScratchDir().toURL();
String outURI = outURL.toString();
if (outURI.endsWith("/")) {
outURI = outURI
+ jspUri.substring(1,jspUri.lastIndexOf("/")+1);
} else {
outURI = outURI
+ jspUri.substring(0,jspUri.lastIndexOf("/")+1);
}
outURL = new URL(outURI);
outDirF = new File(outURL.getFile());
if (!outDirF.exists()) {
outDirF.mkdirs();
}
this.setOutputDir( outDirF.toString() + File.separator );
outUrls[0] = new URL(outDirF.toURL().toString() + File.separator);
} catch (Exception e) {
throw new IllegalStateException("No output directory: " +
e.getMessage());
}
}
// ==================== Private methods ====================
// Mangling, etc.
/**
* Mangle the specified character to create a legal Java class name.
*/
private static final String mangleChar(char ch) {
String s = Integer.toHexString(ch);
int nzeros = 5 - s.length();
char[] result = new char[6];
result[0] = '_';
for (int i = 1; i <= nzeros; i++) {
result[i] = '0';
}
for (int i = nzeros+1, j = 0; i < 6; i++, j++) {
result[i] = s.charAt(j);
}
return new String(result);
}
private static final boolean isPathSeparator(char c) {
return (c == '/' || c == '\\');
}
private static final String canonicalURI(String s) {
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;
while (separatorPos >= 0 &&
! isPathSeparator(result
.charAt(separatorPos))) {
--separatorPos;
}
if (separatorPos >= 0)
result.setLength(separatorPos);
continue;
}
}
}
}
result.append(c);
++pos;
}
return result.toString();
}
}
