groovy.lang.GroovyClassLoader Maven / Gradle / Ivy
Show all versions of spotless-ext-greclipse Show documentation
/*
* Copyright 2003-2013 the original author or authors.
*
* 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.
*/
/*
* @todo multi threaded compiling of the same class but with different roots
* for compilation... T1 compiles A, which uses B, T2 compiles B... mark A and B
* as parsed and then synchronize compilation. Problems: How to synchronize?
* How to get error messages?
*
*/
package groovy.lang;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.ModuleNode;
import org.codehaus.groovy.classgen.Verifier;
import org.codehaus.groovy.control.*;
import org.codehaus.groovy.runtime.IOGroovyMethods;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import java.io.*;
import java.net.*;
import java.security.*;
import java.util.*;
import java.util.regex.Pattern;
/**
* A ClassLoader which can load Groovy classes. The loaded classes are cached,
* classes from other classloaders should not be cached. To be able to load a
* script that was asked for earlier but was created later it is essential not
* to keep anything like a "class not found" information for that class name.
* This includes possible parent loaders. Classes that are not cached are always
* reloaded.
*
* @author James Strachan
* @author Guillaume Laforge
* @author Steve Goetze
* @author Bing Ran
* @author Scott Stirling
* @author Jochen Theodorou
* @version $Revision$
*/
public class GroovyClassLoader extends URLClassLoader {
/**
* this cache contains the loaded classes or PARSING, if the class is currently parsed
*/
protected final Map classCache = new HashMap();
/**
* This cache contains mappings of file name to class. It is used
* to bypass compilation.
*/
protected final Map sourceCache = new HashMap();
private final CompilerConfiguration config;
private Boolean recompile;
// use 1000000 as offset to avoid conflicts with names form the GroovyShell
private static int scriptNameCounter = 1000000;
private GroovyResourceLoader resourceLoader = new GroovyResourceLoader() {
public URL loadGroovySource(final String filename) throws MalformedURLException {
return AccessController.doPrivileged(new PrivilegedAction() {
public URL run() {
for (String extension : config.getScriptExtensions()) {
try {
URL ret = getSourceFile(filename, extension);
if (ret != null)
return ret;
} catch (Throwable t) { //
}
}
return null;
}
});
}
};
/**
* creates a GroovyClassLoader using the current Thread's context
* Class loader as parent.
*/
public GroovyClassLoader() {
this(Thread.currentThread().getContextClassLoader());
}
/**
* creates a GroovyClassLoader using the given ClassLoader as parent
*/
public GroovyClassLoader(ClassLoader loader) {
this(loader, null);
}
/**
* creates a GroovyClassLoader using the given GroovyClassLoader as parent.
* This loader will get the parent's CompilerConfiguration
*/
public GroovyClassLoader(GroovyClassLoader parent) {
this(parent, parent.config, false);
}
/**
* creates a GroovyClassLoader.
*
* @param parent the parent class loader
* @param config the compiler configuration
* @param useConfigurationClasspath determines if the configurations classpath should be added
*/
public GroovyClassLoader(ClassLoader parent, CompilerConfiguration config, boolean useConfigurationClasspath) {
super(new URL[0], parent);
if (config == null) config = CompilerConfiguration.DEFAULT;
this.config = config;
if (useConfigurationClasspath) {
for (String path : config.getClasspath()) {
this.addClasspath(path);
}
}
}
/**
* creates a GroovyClassLoader using the given ClassLoader as parent.
*/
public GroovyClassLoader(ClassLoader loader, CompilerConfiguration config) {
this(loader, config, true);
}
public void setResourceLoader(GroovyResourceLoader resourceLoader) {
if (resourceLoader == null) {
throw new IllegalArgumentException("Resource loader must not be null!");
}
this.resourceLoader = resourceLoader;
}
public GroovyResourceLoader getResourceLoader() {
return resourceLoader;
}
/**
* Loads the given class node returning the implementation Class.
*
* WARNING: this compilation is not synchronized
*
* @param classNode
* @return a class
*/
public Class defineClass(ClassNode classNode, String file, String newCodeBase) {
CodeSource codeSource = null;
try {
codeSource = new CodeSource(new URL("file", "", newCodeBase), (java.security.cert.Certificate[]) null);
} catch (MalformedURLException e) {
//swallow
}
CompilationUnit unit = createCompilationUnit(config, codeSource);
ClassCollector collector = createCollector(unit, classNode.getModule().getContext());
try {
unit.addClassNode(classNode);
unit.setClassgenCallback(collector);
unit.compile(Phases.CLASS_GENERATION);
definePackage(collector.generatedClass.getName());
return collector.generatedClass;
} catch (CompilationFailedException e) {
throw new RuntimeException(e);
}
}
/**
* Parses the given file into a Java class capable of being run
*
* @param file the file name to parse
* @return the main class defined in the given script
*/
public Class parseClass(File file) throws CompilationFailedException, IOException {
return parseClass(new GroovyCodeSource(file, config.getSourceEncoding()));
}
/**
* Parses the given text into a Java class capable of being run
*
* @param text the text of the script/class to parse
* @param fileName the file name to use as the name of the class
* @return the main class defined in the given script
*/
public Class parseClass(final String text, final String fileName) throws CompilationFailedException {
GroovyCodeSource gcs = AccessController.doPrivileged(new PrivilegedAction() {
public GroovyCodeSource run() {
return new GroovyCodeSource(text, fileName, "/groovy/script");
}
});
gcs.setCachable(false);
return parseClass(gcs);
}
/**
* Parses the given text into a Java class capable of being run
*
* @param text the text of the script/class to parse
* @return the main class defined in the given script
*/
public Class parseClass(String text) throws CompilationFailedException {
return parseClass(text, "script" + System.currentTimeMillis() +
Math.abs(text.hashCode()) + ".groovy");
}
public synchronized String generateScriptName() {
scriptNameCounter++;
return "script" + scriptNameCounter + ".groovy";
}
/**
* @deprecated Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.
*/
public Class parseClass(final InputStream in, final String fileName) throws CompilationFailedException {
// For generic input streams, provide a catch-all codebase of GroovyScript
// Security for these classes can be administered via policy grants with
// a codebase of file:groovy.script
GroovyCodeSource gcs = AccessController.doPrivileged(new PrivilegedAction() {
public GroovyCodeSource run() {
try {
String scriptText = config.getSourceEncoding() != null ?
IOGroovyMethods.getText(in, config.getSourceEncoding()) :
IOGroovyMethods.getText(in);
return new GroovyCodeSource(scriptText, fileName, "/groovy/script");
} catch (IOException e) {
throw new RuntimeException("Impossible to read the content of the input stream for file named: " + fileName, e);
}
}
});
return parseClass(gcs);
}
public Class parseClass(GroovyCodeSource codeSource) throws CompilationFailedException {
return parseClass(codeSource, codeSource.isCachable());
}
/**
* Parses the given code source into a Java class. If there is a class file
* for the given code source, then no parsing is done, instead the cached class is returned.
*
* @param shouldCacheSource if true then the generated class will be stored in the source cache
* @return the main class defined in the given script
*/
public Class parseClass(GroovyCodeSource codeSource, boolean shouldCacheSource) throws CompilationFailedException {
synchronized (sourceCache) {
Class answer = sourceCache.get(codeSource.getName());
if (answer != null) return answer;
answer = doParseClass(codeSource);
if (shouldCacheSource) sourceCache.put(codeSource.getName(), answer);
return answer;
}
}
private Class doParseClass(GroovyCodeSource codeSource) {
validate(codeSource);
Class answer; // Was neither already loaded nor compiling, so compile and add to cache.
CompilationUnit unit = createCompilationUnit(config, codeSource.getCodeSource());
SourceUnit su = null;
File file = codeSource.getFile();
if (file != null) {
su = unit.addSource(file);
} else {
URL url = codeSource.getURL();
if (url != null) {
su = unit.addSource(url);
} else {
su = unit.addSource(codeSource.getName(), codeSource.getScriptText());
}
}
ClassCollector collector = createCollector(unit, su);
unit.setClassgenCallback(collector);
int goalPhase = Phases.CLASS_GENERATION;
if (config != null && config.getTargetDirectory() != null) goalPhase = Phases.OUTPUT;
unit.compile(goalPhase);
answer = collector.generatedClass;
String mainClass = su.getAST().getMainClassName();
for (Object o : collector.getLoadedClasses()) {
Class clazz = (Class) o;
String clazzName = clazz.getName();
definePackage(clazzName);
setClassCacheEntry(clazz);
if (clazzName.equals(mainClass)) answer = clazz;
}
return answer;
}
private void validate(GroovyCodeSource codeSource) {
if (codeSource.getFile() == null) {
if (codeSource.getScriptText() == null) {
throw new IllegalArgumentException("Script text to compile cannot be null!");
}
}
}
private void definePackage(String className) {
int i = className.lastIndexOf('.');
if (i != -1) {
String pkgName = className.substring(0, i);
java.lang.Package pkg = getPackage(pkgName);
if (pkg == null) {
definePackage(pkgName, null, null, null, null, null, null, null);
}
}
}
/**
* gets the currently used classpath.
*
* @return a String[] containing the file information of the urls
* @see #getURLs()
*/
protected String[] getClassPath() {
//workaround for Groovy-835
URL[] urls = getURLs();
String[] ret = new String[urls.length];
for (int i = 0; i < ret.length; i++) {
ret[i] = urls[i].getFile();
}
return ret;
}
protected PermissionCollection getPermissions(CodeSource codeSource) {
PermissionCollection perms;
try {
perms = super.getPermissions(codeSource);
} catch (SecurityException e) {
// We lied about our CodeSource and that makes URLClassLoader unhappy.
perms = new Permissions();
}
ProtectionDomain myDomain = AccessController.doPrivileged(new PrivilegedAction() {
public ProtectionDomain run() {
return getClass().getProtectionDomain();
}
});
PermissionCollection myPerms = myDomain.getPermissions();
if (myPerms != null) {
for (Enumeration elements = myPerms.elements(); elements.hasMoreElements();) {
perms.add(elements.nextElement());
}
}
perms.setReadOnly();
return perms;
}
public static class InnerLoader extends GroovyClassLoader {
private final GroovyClassLoader delegate;
private final long timeStamp;
public InnerLoader(GroovyClassLoader delegate) {
super(delegate);
this.delegate = delegate;
timeStamp = System.currentTimeMillis();
}
public void addClasspath(String path) {
delegate.addClasspath(path);
}
public void clearCache() {
delegate.clearCache();
}
public URL findResource(String name) {
return delegate.findResource(name);
}
public Enumeration findResources(String name) throws IOException {
return delegate.findResources(name);
}
public Class[] getLoadedClasses() {
return delegate.getLoadedClasses();
}
public URL getResource(String name) {
return delegate.getResource(name);
}
public InputStream getResourceAsStream(String name) {
return delegate.getResourceAsStream(name);
}
public GroovyResourceLoader getResourceLoader() {
return delegate.getResourceLoader();
}
public URL[] getURLs() {
return delegate.getURLs();
}
public Class loadClass(String name, boolean lookupScriptFiles, boolean preferClassOverScript, boolean resolve) throws ClassNotFoundException, CompilationFailedException {
Class c = findLoadedClass(name);
if (c != null) return c;
return delegate.loadClass(name, lookupScriptFiles, preferClassOverScript, resolve);
}
public Class parseClass(GroovyCodeSource codeSource, boolean shouldCache) throws CompilationFailedException {
return delegate.parseClass(codeSource, shouldCache);
}
public void setResourceLoader(GroovyResourceLoader resourceLoader) {
delegate.setResourceLoader(resourceLoader);
}
public void addURL(URL url) {
delegate.addURL(url);
}
public long getTimeStamp() {
return timeStamp;
}
}
/**
* creates a new CompilationUnit. If you want to add additional
* phase operations to the CompilationUnit (for example to inject
* additional methods, variables, fields), then you should overwrite
* this method.
*
* @param config the compiler configuration, usually the same as for this class loader
* @param source the source containing the initial file to compile, more files may follow during compilation
* @return the CompilationUnit
*/
protected CompilationUnit createCompilationUnit(CompilerConfiguration config, CodeSource source) {
return new CompilationUnit(config, source, this);
}
/**
* creates a ClassCollector for a new compilation.
*
* @param unit the compilationUnit
* @param su the SourceUnit
* @return the ClassCollector
*/
protected ClassCollector createCollector(CompilationUnit unit, SourceUnit su) {
InnerLoader loader = AccessController.doPrivileged(new PrivilegedAction() {
public InnerLoader run() {
return new InnerLoader(GroovyClassLoader.this);
}
});
return new ClassCollector(loader, unit, su);
}
public static class ClassCollector extends CompilationUnit.ClassgenCallback {
private Class generatedClass;
private final GroovyClassLoader cl;
private final SourceUnit su;
private final CompilationUnit unit;
private final Collection loadedClasses;
protected ClassCollector(InnerLoader cl, CompilationUnit unit, SourceUnit su) {
this.cl = cl;
this.unit = unit;
this.loadedClasses = new ArrayList();
this.su = su;
}
public GroovyClassLoader getDefiningClassLoader() {
return cl;
}
protected Class createClass(byte[] code, ClassNode classNode) {
GroovyClassLoader cl = getDefiningClassLoader();
Class theClass = cl.defineClass(classNode.getName(), code, 0, code.length, unit.getAST().getCodeSource());
this.loadedClasses.add(theClass);
if (generatedClass == null) {
ModuleNode mn = classNode.getModule();
SourceUnit msu = null;
if (mn != null) msu = mn.getContext();
ClassNode main = null;
if (mn != null) main = (ClassNode) mn.getClasses().get(0);
if (msu == su && main == classNode) generatedClass = theClass;
}
return theClass;
}
protected Class onClassNode(ClassWriter classWriter, ClassNode classNode) {
byte[] code = classWriter.toByteArray();
return createClass(code, classNode);
}
public void call(ClassVisitor classWriter, ClassNode classNode) {
onClassNode((ClassWriter) classWriter, classNode);
}
public Collection getLoadedClasses() {
return this.loadedClasses;
}
}
/**
* open up the super class define that takes raw bytes
*/
public Class defineClass(String name, byte[] b) {
return super.defineClass(name, b, 0, b.length);
}
/**
* loads a class from a file or a parent classloader.
* This method does call loadClass(String, boolean, boolean, boolean)
* with the last parameter set to false.
*
* @throws CompilationFailedException if compilation was not successful
*/
public Class loadClass(final String name, boolean lookupScriptFiles, boolean preferClassOverScript)
throws ClassNotFoundException, CompilationFailedException {
return loadClass(name, lookupScriptFiles, preferClassOverScript, false);
}
/**
* gets a class from the class cache. This cache contains only classes loaded through
* this class loader or an InnerLoader instance. If no class is stored for a
* specific name, then the method should return null.
*
* @param name of the class
* @return the class stored for the given name
* @see #removeClassCacheEntry(String)
* @see #setClassCacheEntry(Class)
* @see #clearCache()
*/
protected Class getClassCacheEntry(String name) {
if (name == null) return null;
synchronized (classCache) {
return classCache.get(name);
}
}
/**
* sets an entry in the class cache.
*
* @param cls the class
* @see #removeClassCacheEntry(String)
* @see #getClassCacheEntry(String)
* @see #clearCache()
*/
protected void setClassCacheEntry(Class cls) {
synchronized (classCache) {
classCache.put(cls.getName(), cls);
}
}
/**
* removes a class from the class cache.
*
* @param name of the class
* @see #getClassCacheEntry(String)
* @see #setClassCacheEntry(Class)
* @see #clearCache()
*/
protected void removeClassCacheEntry(String name) {
synchronized (classCache) {
classCache.remove(name);
}
}
/**
* adds a URL to the classloader.
*
* @param url the new classpath element
*/
public void addURL(URL url) {
super.addURL(url);
}
/**
* Indicates if a class is recompilable. Recompilable means, that the classloader
* will try to locate a groovy source file for this class and then compile it again,
* adding the resulting class as entry to the cache. Giving null as class is like a
* recompilation, so the method should always return true here. Only classes that are
* implementing GroovyObject are compilable and only if the timestamp in the class
* is lower than Long.MAX_VALUE.
*
* NOTE: First the parent loaders will be asked and only if they don't return a
* class the recompilation will happen. Recompilation also only happen if the source
* file is newer.
*
* @param cls the class to be tested. If null the method should return true
* @return true if the class should be compiled again
* @see #isSourceNewer(URL, Class)
*/
protected boolean isRecompilable(Class cls) {
if (cls == null) return true;
if (cls.getClassLoader() == this) return false;
if (recompile == null && !config.getRecompileGroovySource()) return false;
if (recompile != null && !recompile) return false;
if (!GroovyObject.class.isAssignableFrom(cls)) return false;
long timestamp = getTimeStamp(cls);
if (timestamp == Long.MAX_VALUE) return false;
return true;
}
/**
* sets if the recompilation should be enable. There are 3 possible
* values for this. Any value different than null overrides the
* value from the compiler configuration. true means to recompile if needed
* false means to never recompile.
*
* @param mode the recompilation mode
* @see CompilerConfiguration
*/
public void setShouldRecompile(Boolean mode) {
recompile = mode;
}
/**
* gets the currently set recompilation mode. null means, the
* compiler configuration is used. False means no recompilation and
* true means that recompilation will be done if needed.
*
* @return the recompilation mode
*/
public Boolean isShouldRecompile() {
return recompile;
}
/**
* loads a class from a file or a parent classloader.
*
* @param name of the class to be loaded
* @param lookupScriptFiles if false no lookup at files is done at all
* @param preferClassOverScript if true the file lookup is only done if there is no class
* @param resolve see {@link java.lang.ClassLoader#loadClass(java.lang.String, boolean)}
* @return the class found or the class created from a file lookup
* @throws ClassNotFoundException if the class could not be found
* @throws CompilationFailedException if the source file could not be compiled
*/
public Class loadClass(final String name, boolean lookupScriptFiles, boolean preferClassOverScript, boolean resolve)
throws ClassNotFoundException, CompilationFailedException {
// look into cache
Class cls = getClassCacheEntry(name);
// enable recompilation?
boolean recompile = isRecompilable(cls);
if (!recompile) return cls;
// try parent loader
ClassNotFoundException last = null;
try {
Class parentClassLoaderClass = super.loadClass(name, resolve);
// always return if the parent loader was successful
if (cls != parentClassLoaderClass) return parentClassLoaderClass;
} catch (ClassNotFoundException cnfe) {
last = cnfe;
} catch (NoClassDefFoundError ncdfe) {
if (ncdfe.getMessage().indexOf("wrong name") > 0) {
last = new ClassNotFoundException(name);
} else {
throw ncdfe;
}
}
// check security manager
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
String className = name.replace('/', '.');
int i = className.lastIndexOf('.');
// no checks on the sun.reflect classes for reflection speed-up
// in particular ConstructorAccessorImpl, MethodAccessorImpl, FieldAccessorImpl and SerializationConstructorAccessorImpl
// which are generated at runtime by the JDK
if (i != -1 && !className.startsWith("sun.reflect.")) {
sm.checkPackageAccess(className.substring(0, i));
}
}
// prefer class if no recompilation
if (cls != null && preferClassOverScript) return cls;
// at this point the loading from a parent loader failed
// and we want to recompile if needed.
if (lookupScriptFiles) {
// try groovy file
try {
// check if recompilation already happened.
final Class classCacheEntry = getClassCacheEntry(name);
if (classCacheEntry != cls) return classCacheEntry;
URL source = resourceLoader.loadGroovySource(name);
// if recompilation fails, we want cls==null
Class oldClass = cls;
cls = null;
cls = recompile(source, name, oldClass);
} catch (IOException ioe) {
last = new ClassNotFoundException("IOException while opening groovy source: " + name, ioe);
} finally {
if (cls == null) {
removeClassCacheEntry(name);
} else {
setClassCacheEntry(cls);
}
}
}
if (cls == null) {
// no class found, there should have been an exception before now
if (last == null) throw new AssertionError(true);
throw last;
}
return cls;
}
/**
* (Re)Compiles the given source.
* This method starts the compilation of a given source, if
* the source has changed since the class was created. For
* this isSourceNewer is called.
*
* @param source the source pointer for the compilation
* @param className the name of the class to be generated
* @param oldClass a possible former class
* @return the old class if the source wasn't new enough, the new class else
* @throws CompilationFailedException if the compilation failed
* @throws IOException if the source is not readable
* @see #isSourceNewer(URL, Class)
*/
protected Class recompile(URL source, String className, Class oldClass) throws CompilationFailedException, IOException {
if (source != null) {
// found a source, compile it if newer
if ((oldClass != null && isSourceNewer(source, oldClass)) || (oldClass == null)) {
synchronized (sourceCache) {
String name = source.toExternalForm();
sourceCache.remove(name);
if (isFile(source)) {
try {
return parseClass(new GroovyCodeSource(new File(source.toURI()), config.getSourceEncoding()));
} catch (URISyntaxException e) {
// do nothing and fall back to the other version
}
}
return parseClass(source.openStream(), name);
}
}
}
return oldClass;
}
@Override
public Class loadClass(String name) throws ClassNotFoundException {
return loadClass(name, false);
}
/**
* Implemented here to check package access prior to returning an
* already loaded class.
*
* @throws CompilationFailedException if the compilation failed
* @throws ClassNotFoundException if the class was not found
* @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
*/
protected Class loadClass(final String name, boolean resolve) throws ClassNotFoundException {
return loadClass(name, true, true, resolve);
}
/**
* gets the time stamp of a given class. For groovy
* generated classes this usually means to return the value
* of the static field __timeStamp. If the parameter doesn't
* have such a field, then Long.MAX_VALUE is returned
*
* @param cls the class
* @return the time stamp
*/
protected long getTimeStamp(Class cls) {
return Verifier.getTimestamp(cls);
}
/**
* This method will take a file name and try to "decode" any URL encoded characters. For example
* if the file name contains any spaces this method call will take the resulting %20 encoded values
* and convert them to spaces.
*
* This method was added specifically to fix defect: Groovy-1787. The defect involved a situation
* where two scripts were sitting in a directory with spaces in its name. The code would fail
* when the class loader tried to resolve the file name and would choke on the URLEncoded space values.
*/
private String decodeFileName(String fileName) {
String decodedFile = fileName;
try {
decodedFile = URLDecoder.decode(fileName, "UTF-8");
} catch (UnsupportedEncodingException e) {
System.err.println("Encountered an invalid encoding scheme when trying to use URLDecoder.decode() inside of the GroovyClassLoader.decodeFileName() method. Returning the unencoded URL.");
System.err.println("Please note that if you encounter this error and you have spaces in your directory you will run into issues. Refer to GROOVY-1787 for description of this bug.");
}
return decodedFile;
}
private boolean isFile(URL ret) {
return ret != null && ret.getProtocol().equals("file");
}
private File getFileForUrl(URL ret, String filename) {
String fileWithoutPackage = filename;
if (fileWithoutPackage.indexOf('/') != -1) {
int index = fileWithoutPackage.lastIndexOf('/');
fileWithoutPackage = fileWithoutPackage.substring(index + 1);
}
return fileReallyExists(ret, fileWithoutPackage);
}
private File fileReallyExists(URL ret, String fileWithoutPackage) {
File path;
try {
/* fix for GROOVY-5809 */
path = new File(ret.toURI());
} catch(URISyntaxException e) {
path = new File(decodeFileName(ret.getFile()));
}
path = path.getParentFile();
if (path.exists() && path.isDirectory()) {
File file = new File(path, fileWithoutPackage);
if (file.exists()) {
// file.exists() might be case insensitive. Let's do
// case sensitive match for the filename
File parent = file.getParentFile();
for (String child : parent.list()) {
if (child.equals(fileWithoutPackage)) return file;
}
}
}
//file does not exist!
return null;
}
private URL getSourceFile(String name, String extension) {
String filename = name.replace('.', '/') + "." + extension;
URL ret = getResource(filename);
if (isFile(ret) && getFileForUrl(ret, filename) == null) return null;
return ret;
}
/**
* Decides if the given source is newer than a class.
*
* @param source the source we may want to compile
* @param cls the former class
* @return true if the source is newer, false else
* @throws IOException if it is not possible to open an
* connection for the given source
* @see #getTimeStamp(Class)
*/
protected boolean isSourceNewer(URL source, Class cls) throws IOException {
long lastMod;
// Special handling for file:// protocol, as getLastModified() often reports
// incorrect results (-1)
if (isFile(source)) {
// Coerce the file URL to a File
// See ClassNodeResolver.isSourceNewer for another method that replaces '|' with ':'.
// WTF: Why is this done and where is it documented?
String path = source.getPath().replace('/', File.separatorChar).replace('|', ':');
File file = new File(path);
lastMod = file.lastModified();
} else {
URLConnection conn = source.openConnection();
lastMod = conn.getLastModified();
conn.getInputStream().close();
}
long classTime = getTimeStamp(cls);
return classTime + config.getMinimumRecompilationInterval() < lastMod;
}
/**
* adds a classpath to this classloader.
*
* @param path is a jar file or a directory.
* @see #addURL(URL)
*/
public void addClasspath(final String path) {
AccessController.doPrivileged(new PrivilegedAction() {
public Void run() {
try {
// As the java.net.URL Javadoc says, the recommended way to get a URL is via URI.
// http://docs.oracle.com/javase/7/docs/api/java/net/URL.html
// "Note, the URI class does perform escaping of its component fields in certain circumstances.
// The recommended way to manage the encoding and decoding of URLs is to use URI, and to convert
// between these two classes using toURI() and URI.toURL()."
// A possibly better approach here is to construct a URI and then resolve it against
// a URI for the current working directory.
// But we use this string match for now so everyone can see it doesn't hurt file-only classpaths.
URI newURI;
if (!URI_PATTERN.matcher(path).matches()) {
newURI = new File(path).toURI();
} else {
newURI = new URI(path);
}
URL[] urls = getURLs();
for (URL url : urls) {
// Do not use URL.equals. It uses the network to resolve names and compares ip addresses!
// That is a violation of RFC and just plain evil.
// http://michaelscharf.blogspot.com/2006/11/javaneturlequals-and-hashcode-make.html
// http://docs.oracle.com/javase/7/docs/api/java/net/URL.html#equals(java.lang.Object)
// "Since hosts comparison requires name resolution, this operation is a blocking operation.
// Note: The defined behavior for equals is known to be inconsistent with virtual hosting in HTTP."
if (newURI.equals(url.toURI())) return null;
}
addURL(newURI.toURL());
} catch (MalformedURLException e) {
//TODO: fail through ?
} catch (URISyntaxException e) {
// Just doing the same thing...
}
return null;
}
});
}
// TODO remove duplication with GroovyMain#uriPattern
// RFC2396
// scheme = alpha *( alpha | digit | "+" | "-" | "." )
// match URIs but not Windows filenames, e.g.: http://cnn.com but not C:\xxx\file.ext
private static final Pattern URI_PATTERN = Pattern.compile("\\p{Alpha}[-+.\\p{Alnum}]*:[^\\\\]*");
/**
* Returns all Groovy classes loaded by this class loader.
*
* @return all classes loaded by this class loader
*/
public Class[] getLoadedClasses() {
synchronized (classCache) {
final Collection values = classCache.values();
return values.toArray(new Class[values.size()]);
}
}
/**
* Removes all classes from the class cache.
*
* @see #getClassCacheEntry(String)
* @see #setClassCacheEntry(Class)
* @see #removeClassCacheEntry(String)
*/
public void clearCache() {
synchronized (classCache) {
classCache.clear();
}
synchronized (sourceCache) {
sourceCache.clear();
}
}
}