org.apache.jasper.compiler.Compiler Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.compiler;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.List;
import org.apache.jasper.JasperException;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.Options;
import org.apache.jasper.servlet.JspServletWrapper;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Main JSP compiler class. This class uses Ant for compiling.
*
* @author Anil K. Vijendran
* @author Mandar Raje
* @author Pierre Delisle
* @author Kin-man Chung
* @author Remy Maucherat
* @author Mark Roth
*/
public abstract class Compiler {
private final Log log = LogFactory.getLog(Compiler.class); // must not be static
// ----------------------------------------------------- Instance Variables
protected JspCompilationContext ctxt;
protected ErrorDispatcher errDispatcher;
protected PageInfo pageInfo;
protected JspServletWrapper jsw;
protected TagFileProcessor tfp;
protected Options options;
protected Node.Nodes pageNodes;
// ------------------------------------------------------------ Constructor
public void init(JspCompilationContext ctxt, JspServletWrapper jsw) {
this.jsw = jsw;
this.ctxt = ctxt;
this.options = ctxt.getOptions();
}
// --------------------------------------------------------- Public Methods
/**
*
* Retrieves the parsed nodes of the JSP page, if they are available. May
* return null. Used in development mode for generating detailed error
* messages. http://issues.apache.org/bugzilla/show_bug.cgi?id=37062.
*
*/
public Node.Nodes getPageNodes() {
return this.pageNodes;
}
/**
* Compile the jsp file into equivalent servlet in .java file
*
* @return a smap for the current JSP page, if one is generated, null
* otherwise
*/
protected String[] generateJava() throws Exception {
String[] smapStr = null;
long t1, t2, t3, t4;
t1 = t2 = t3 = t4 = 0;
if (log.isDebugEnabled()) {
t1 = System.currentTimeMillis();
}
// Setup page info area
pageInfo = new PageInfo(new BeanRepository(ctxt.getClassLoader(),
errDispatcher), ctxt.getJspFile());
JspConfig jspConfig = options.getJspConfig();
JspConfig.JspProperty jspProperty = jspConfig.findJspProperty(ctxt
.getJspFile());
/*
* If the current uri is matched by a pattern specified in a
* jsp-property-group in web.xml, initialize pageInfo with those
* properties.
*/
if (jspProperty.isELIgnored() != null) {
pageInfo.setELIgnored(JspUtil.booleanValue(jspProperty
.isELIgnored()));
}
if (jspProperty.isScriptingInvalid() != null) {
pageInfo.setScriptingInvalid(JspUtil.booleanValue(jspProperty
.isScriptingInvalid()));
}
if (jspProperty.getIncludePrelude() != null) {
pageInfo.setIncludePrelude(jspProperty.getIncludePrelude());
}
if (jspProperty.getIncludeCoda() != null) {
pageInfo.setIncludeCoda(jspProperty.getIncludeCoda());
}
if (jspProperty.isDeferedSyntaxAllowedAsLiteral() != null) {
pageInfo.setDeferredSyntaxAllowedAsLiteral(JspUtil.booleanValue(jspProperty
.isDeferedSyntaxAllowedAsLiteral()));
}
if (jspProperty.isTrimDirectiveWhitespaces() != null) {
pageInfo.setTrimDirectiveWhitespaces(JspUtil.booleanValue(jspProperty
.isTrimDirectiveWhitespaces()));
}
// Default ContentType processing is deferred until after the page has
// been parsed
if (jspProperty.getBuffer() != null) {
pageInfo.setBufferValue(jspProperty.getBuffer(), null,
errDispatcher);
}
if (jspProperty.isErrorOnUndeclaredNamespace() != null) {
pageInfo.setErrorOnUndeclaredNamespace(
JspUtil.booleanValue(
jspProperty.isErrorOnUndeclaredNamespace()));
}
if (ctxt.isTagFile()) {
try {
double libraryVersion = Double.parseDouble(ctxt.getTagInfo()
.getTagLibrary().getRequiredVersion());
if (libraryVersion < 2.0) {
pageInfo.setIsELIgnored("true", null, errDispatcher, true);
}
if (libraryVersion < 2.1) {
pageInfo.setDeferredSyntaxAllowedAsLiteral("true", null,
errDispatcher, true);
}
} catch (NumberFormatException ex) {
errDispatcher.jspError(ex);
}
}
ctxt.checkOutputDir();
String javaFileName = ctxt.getServletJavaFileName();
ServletWriter writer = null;
try {
/*
* The setting of isELIgnored changes the behaviour of the parser
* in subtle ways. To add to the 'fun', isELIgnored can be set in
* any file that forms part of the translation unit so setting it
* in a file included towards the end of the translation unit can
* change how the parser should have behaved when parsing content
* up to the point where isELIgnored was set. Arghh!
* Previous attempts to hack around this have only provided partial
* solutions. We now use two passes to parse the translation unit.
* The first just parses the directives and the second parses the
* whole translation unit once we know how isELIgnored has been set.
* TODO There are some possible optimisations of this process.
*/
// Parse the file
ParserController parserCtl = new ParserController(ctxt, this);
// Pass 1 - the directives
Node.Nodes directives =
parserCtl.parseDirectives(ctxt.getJspFile());
Validator.validateDirectives(this, directives);
// Pass 2 - the whole translation unit
pageNodes = parserCtl.parse(ctxt.getJspFile());
// Leave this until now since it can only be set once - bug 49726
if (pageInfo.getContentType() == null &&
jspProperty.getDefaultContentType() != null) {
pageInfo.setContentType(jspProperty.getDefaultContentType());
}
if (ctxt.isPrototypeMode()) {
// generate prototype .java file for the tag file
writer = setupContextWriter(javaFileName);
Generator.generate(writer, this, pageNodes);
writer.close();
writer = null;
return null;
}
// Validate and process attributes - don't re-validate the
// directives we validated in pass 1
Validator.validateExDirectives(this, pageNodes);
if (log.isDebugEnabled()) {
t2 = System.currentTimeMillis();
}
// Collect page info
Collector.collect(this, pageNodes);
// Compile (if necessary) and load the tag files referenced in
// this compilation unit.
tfp = new TagFileProcessor();
tfp.loadTagFiles(this, pageNodes);
if (log.isDebugEnabled()) {
t3 = System.currentTimeMillis();
}
// Determine which custom tag needs to declare which scripting vars
ScriptingVariabler.set(pageNodes, errDispatcher);
// Optimizations by Tag Plugins
TagPluginManager tagPluginManager = options.getTagPluginManager();
tagPluginManager.apply(pageNodes, errDispatcher, pageInfo);
// Optimization: concatenate contiguous template texts.
TextOptimizer.concatenate(this, pageNodes);
// Generate static function mapper codes.
ELFunctionMapper.map(pageNodes);
// generate servlet .java file
writer = setupContextWriter(javaFileName);
Generator.generate(writer, this, pageNodes);
writer.close();
writer = null;
// The writer is only used during the compile, dereference
// it in the JspCompilationContext when done to allow it
// to be GC'd and save memory.
ctxt.setWriter(null);
if (log.isDebugEnabled()) {
t4 = System.currentTimeMillis();
log.debug("Generated " + javaFileName + " total=" + (t4 - t1)
+ " generate=" + (t4 - t3) + " validate=" + (t2 - t1));
}
} catch (Exception e) {
if (writer != null) {
try {
writer.close();
writer = null;
} catch (Exception e1) {
// do nothing
}
}
// Remove the generated .java file
new File(javaFileName).delete();
throw e;
} finally {
if (writer != null) {
try {
writer.close();
} catch (Exception e2) {
// do nothing
}
}
}
// JSR45 Support
if (!options.isSmapSuppressed()) {
smapStr = SmapUtil.generateSmap(ctxt, pageNodes);
}
// If any proto type .java and .class files was generated,
// the prototype .java may have been replaced by the current
// compilation (if the tag file is self referencing), but the
// .class file need to be removed, to make sure that javac would
// generate .class again from the new .java file just generated.
tfp.removeProtoTypeFiles(ctxt.getClassFileName());
return smapStr;
}
private ServletWriter setupContextWriter(String javaFileName)
throws FileNotFoundException, JasperException {
ServletWriter writer;
// Setup the ServletWriter
String javaEncoding = ctxt.getOptions().getJavaEncoding();
OutputStreamWriter osw = null;
try {
osw = new OutputStreamWriter(
new FileOutputStream(javaFileName), javaEncoding);
} catch (UnsupportedEncodingException ex) {
errDispatcher.jspError("jsp.error.needAlternateJavaEncoding",
javaEncoding);
}
writer = new ServletWriter(new PrintWriter(osw));
ctxt.setWriter(writer);
return writer;
}
/**
* Compile the servlet from .java file to .class file
*/
protected abstract void generateClass(String[] smap)
throws FileNotFoundException, JasperException, Exception;
/**
* Compile the jsp file from the current engine context
*/
public void compile() throws FileNotFoundException, JasperException,
Exception {
compile(true);
}
/**
* Compile the jsp file from the current engine context. As an side- effect,
* tag files that are referenced by this page are also compiled.
*
* @param compileClass
* If true, generate both .java and .class file If false,
* generate only .java file
*/
public void compile(boolean compileClass) throws FileNotFoundException,
JasperException, Exception {
compile(compileClass, false);
}
/**
* Compile the jsp file from the current engine context. As an side- effect,
* tag files that are referenced by this page are also compiled.
*
* @param compileClass
* If true, generate both .java and .class file If false,
* generate only .java file
* @param jspcMode
* true if invoked from JspC, false otherwise
*/
public void compile(boolean compileClass, boolean jspcMode)
throws FileNotFoundException, JasperException, Exception {
if (errDispatcher == null) {
this.errDispatcher = new ErrorDispatcher(jspcMode);
}
try {
String[] smap = generateJava();
if (compileClass) {
generateClass(smap);
// Fix for bugzilla 41606
// Set JspServletWrapper.servletClassLastModifiedTime after successful compile
String targetFileName = ctxt.getClassFileName();
if (targetFileName != null) {
File targetFile = new File(targetFileName);
if (targetFile.exists() && jsw != null) {
jsw.setServletClassLastModifiedTime(targetFile.lastModified());
}
}
}
} finally {
if (tfp != null && ctxt.isPrototypeMode()) {
tfp.removeProtoTypeFiles(null);
}
// Make sure these object which are only used during the
// generation and compilation of the JSP page get
// dereferenced so that they can be GC'd and reduce the
// memory footprint.
tfp = null;
errDispatcher = null;
pageInfo = null;
// Only get rid of the pageNodes if in production.
// In development mode, they are used for detailed
// error messages.
// http://issues.apache.org/bugzilla/show_bug.cgi?id=37062
if (!this.options.getDevelopment()) {
pageNodes = null;
}
if (ctxt.getWriter() != null) {
ctxt.getWriter().close();
ctxt.setWriter(null);
}
}
}
/**
* This is a protected method intended to be overridden by subclasses of
* Compiler. This is used by the compile method to do all the compilation.
*/
public boolean isOutDated() {
return isOutDated(true);
}
/**
* Determine if a compilation is necessary by checking the time stamp of the
* JSP page with that of the corresponding .class or .java file. If the page
* has dependencies, the check is also extended to its dependents, and so
* on. This method can by overridden by a subclasses of Compiler.
*
* @param checkClass
* If true, check against .class file, if false, check against
* .java file.
*/
public boolean isOutDated(boolean checkClass) {
String jsp = ctxt.getJspFile();
if (jsw != null
&& (ctxt.getOptions().getModificationTestInterval() > 0)) {
if (jsw.getLastModificationTest()
+ (ctxt.getOptions().getModificationTestInterval() * 1000) > System
.currentTimeMillis()) {
return false;
}
jsw.setLastModificationTest(System.currentTimeMillis());
}
long jspRealLastModified = 0;
try {
URL jspUrl = ctxt.getResource(jsp);
if (jspUrl == null) {
ctxt.incrementRemoved();
return true;
}
URLConnection uc = jspUrl.openConnection();
if (uc instanceof JarURLConnection) {
jspRealLastModified =
((JarURLConnection) uc).getJarEntry().getTime();
} else {
jspRealLastModified = uc.getLastModified();
}
uc.getInputStream().close();
} catch (Exception e) {
log.debug("Problem accessing resource. Treat as outdated.", e);
return true;
}
long targetLastModified = 0;
File targetFile;
if (checkClass) {
targetFile = new File(ctxt.getClassFileName());
} else {
targetFile = new File(ctxt.getServletJavaFileName());
}
if (!targetFile.exists()) {
return true;
}
targetLastModified = targetFile.lastModified();
if (checkClass && jsw != null) {
jsw.setServletClassLastModifiedTime(targetLastModified);
}
if (targetLastModified < jspRealLastModified) {
if (log.isDebugEnabled()) {
log.debug("Compiler: outdated: " + targetFile + " "
+ targetLastModified);
}
return true;
}
// determine if source dependent files (e.g. includes using include
// directives) have been changed.
if (jsw == null) {
return false;
}
List depends = jsw.getDependants();
if (depends == null) {
return false;
}
Iterator it = depends.iterator();
while (it.hasNext()) {
String include = it.next();
try {
URL includeUrl = ctxt.getResource(include);
if (includeUrl == null) {
return true;
}
URLConnection iuc = includeUrl.openConnection();
long includeLastModified = 0;
if (iuc instanceof JarURLConnection) {
includeLastModified =
((JarURLConnection) iuc).getJarEntry().getTime();
} else {
includeLastModified = iuc.getLastModified();
}
iuc.getInputStream().close();
if (includeLastModified > targetLastModified) {
return true;
}
} catch (Exception e) {
log.debug("Problem accessing resource. Treat as outdated.", e);
return true;
}
}
return false;
}
/**
* Gets the error dispatcher.
*/
public ErrorDispatcher getErrorDispatcher() {
return errDispatcher;
}
/**
* Gets the info about the page under compilation
*/
public PageInfo getPageInfo() {
return pageInfo;
}
public JspCompilationContext getCompilationContext() {
return ctxt;
}
/**
* Remove generated files
*/
public void removeGeneratedFiles() {
try {
String classFileName = ctxt.getClassFileName();
if (classFileName != null) {
File classFile = new File(classFileName);
if (log.isDebugEnabled())
log.debug("Deleting " + classFile);
classFile.delete();
}
} catch (Exception e) {
// Remove as much as possible, ignore possible exceptions
}
try {
String javaFileName = ctxt.getServletJavaFileName();
if (javaFileName != null) {
File javaFile = new File(javaFileName);
if (log.isDebugEnabled())
log.debug("Deleting " + javaFile);
javaFile.delete();
}
} catch (Exception e) {
// Remove as much as possible, ignore possible exceptions
}
}
public void removeGeneratedClassFiles() {
try {
String classFileName = ctxt.getClassFileName();
if (classFileName != null) {
File classFile = new File(classFileName);
if (log.isDebugEnabled())
log.debug("Deleting " + classFile);
classFile.delete();
}
} catch (Exception e) {
// Remove as much as possible, ignore possible exceptions
}
}
}