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/*
* 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 javax.el;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/**
* @since EL 3.0
*/
public class ImportHandler {
private static final Map> standardPackages = new HashMap<>();
static {
// Servlet 4.0
Set servletClassNames = new HashSet<>();
// Interfaces
servletClassNames.add("AsyncContext");
servletClassNames.add("AsyncListener");
servletClassNames.add("Filter");
servletClassNames.add("FilterChain");
servletClassNames.add("FilterConfig");
servletClassNames.add("FilterRegistration");
servletClassNames.add("FilterRegistration.Dynamic");
servletClassNames.add("ReadListener");
servletClassNames.add("Registration");
servletClassNames.add("Registration.Dynamic");
servletClassNames.add("RequestDispatcher");
servletClassNames.add("Servlet");
servletClassNames.add("ServletConfig");
servletClassNames.add("ServletContainerInitializer");
servletClassNames.add("ServletContext");
servletClassNames.add("ServletContextAttributeListener");
servletClassNames.add("ServletContextListener");
servletClassNames.add("ServletRegistration");
servletClassNames.add("ServletRegistration.Dynamic");
servletClassNames.add("ServletRequest");
servletClassNames.add("ServletRequestAttributeListener");
servletClassNames.add("ServletRequestListener");
servletClassNames.add("ServletResponse");
servletClassNames.add("SessionCookieConfig");
servletClassNames.add("SingleThreadModel");
servletClassNames.add("WriteListener");
// Classes
servletClassNames.add("AsyncEvent");
servletClassNames.add("GenericFilter");
servletClassNames.add("GenericServlet");
servletClassNames.add("HttpConstraintElement");
servletClassNames.add("HttpMethodConstraintElement");
servletClassNames.add("MultipartConfigElement");
servletClassNames.add("ServletContextAttributeEvent");
servletClassNames.add("ServletContextEvent");
servletClassNames.add("ServletInputStream");
servletClassNames.add("ServletOutputStream");
servletClassNames.add("ServletRequestAttributeEvent");
servletClassNames.add("ServletRequestEvent");
servletClassNames.add("ServletRequestWrapper");
servletClassNames.add("ServletResponseWrapper");
servletClassNames.add("ServletSecurityElement");
// Enums
servletClassNames.add("DispatcherType");
servletClassNames.add("SessionTrackingMode");
// Exceptions
servletClassNames.add("ServletException");
servletClassNames.add("UnavailableException");
standardPackages.put("javax.servlet", servletClassNames);
// Servlet 4.0
Set servletHttpClassNames = new HashSet<>();
// Interfaces
servletHttpClassNames.add("HttpServletMapping");
servletHttpClassNames.add("HttpServletRequest");
servletHttpClassNames.add("HttpServletResponse");
servletHttpClassNames.add("HttpSession");
servletHttpClassNames.add("HttpSessionActivationListener");
servletHttpClassNames.add("HttpSessionAttributeListener");
servletHttpClassNames.add("HttpSessionBindingListener");
servletHttpClassNames.add("HttpSessionContext");
servletHttpClassNames.add("HttpSessionIdListener");
servletHttpClassNames.add("HttpSessionListener");
servletHttpClassNames.add("HttpUpgradeHandler");
servletHttpClassNames.add("Part");
servletHttpClassNames.add("PushBuilder");
servletHttpClassNames.add("WebConnection");
// Classes
servletHttpClassNames.add("Cookie");
servletHttpClassNames.add("HttpFilter");
servletHttpClassNames.add("HttpServlet");
servletHttpClassNames.add("HttpServletRequestWrapper");
servletHttpClassNames.add("HttpServletResponseWrapper");
servletHttpClassNames.add("HttpSessionBindingEvent");
servletHttpClassNames.add("HttpSessionEvent");
servletHttpClassNames.add("HttpUtils");
// Enums
servletHttpClassNames.add("MappingMatch");
standardPackages.put("javax.servlet.http", servletHttpClassNames);
// JSP 2.3
Set servletJspClassNames = new HashSet<>();
// Interfaces
servletJspClassNames.add("HttpJspPage");
servletJspClassNames.add("JspApplicationContext");
servletJspClassNames.add("JspPage");
// Classes
servletJspClassNames.add("ErrorData");
servletJspClassNames.add("JspContext");
servletJspClassNames.add("JspEngineInfo");
servletJspClassNames.add("JspFactory");
servletJspClassNames.add("JspWriter");
servletJspClassNames.add("PageContext");
servletJspClassNames.add("Exceptions");
servletJspClassNames.add("JspException");
servletJspClassNames.add("JspTagException");
servletJspClassNames.add("SkipPageException");
standardPackages.put("javax.servlet.jsp", servletJspClassNames);
Set javaLangClassNames = new HashSet<>();
// Based on Java 21 EA29
// Interfaces
javaLangClassNames.add("Appendable");
javaLangClassNames.add("AutoCloseable");
javaLangClassNames.add("CharSequence");
javaLangClassNames.add("Cloneable");
javaLangClassNames.add("Comparable");
javaLangClassNames.add("Iterable");
javaLangClassNames.add("ProcessHandle");
javaLangClassNames.add("ProcessHandle.Info");
javaLangClassNames.add("Readable");
javaLangClassNames.add("Runnable");
javaLangClassNames.add("StackWalker.StackFrame");
javaLangClassNames.add("System.Logger");
javaLangClassNames.add("Thread.Builder");
javaLangClassNames.add("Thread.Builder.OfPlatform");
javaLangClassNames.add("Thread.Builder.OfVirtual");
javaLangClassNames.add("Thread.UncaughtExceptionHandler");
// Classes
javaLangClassNames.add("Boolean");
javaLangClassNames.add("Byte");
javaLangClassNames.add("Character");
javaLangClassNames.add("Character.Subset");
javaLangClassNames.add("Character.UnicodeBlock");
javaLangClassNames.add("Class");
javaLangClassNames.add("ClassLoader");
javaLangClassNames.add("ClassValue");
javaLangClassNames.add("Compiler");
javaLangClassNames.add("Double");
javaLangClassNames.add("Enum");
javaLangClassNames.add("Enum.EnumDesc");
javaLangClassNames.add("Float");
javaLangClassNames.add("InheritableThreadLocal");
javaLangClassNames.add("Integer");
javaLangClassNames.add("Long");
javaLangClassNames.add("Math");
javaLangClassNames.add("Module");
javaLangClassNames.add("ModuleLayer");
javaLangClassNames.add("ModuleLayer.Controller");
javaLangClassNames.add("Number");
javaLangClassNames.add("Object");
javaLangClassNames.add("Package");
javaLangClassNames.add("Process");
javaLangClassNames.add("ProcessBuilder");
javaLangClassNames.add("ProcessBuilder.Redirect");
javaLangClassNames.add("Record");
javaLangClassNames.add("Runtime");
javaLangClassNames.add("Runtime.Version");
javaLangClassNames.add("RuntimePermission");
javaLangClassNames.add("ScopedValue");
javaLangClassNames.add("ScopedValue.CallableOp");
javaLangClassNames.add("ScopedValue.Carrier");
javaLangClassNames.add("SecurityManager");
javaLangClassNames.add("Short");
javaLangClassNames.add("StackTraceElement");
javaLangClassNames.add("StackWalker");
javaLangClassNames.add("StrictMath");
javaLangClassNames.add("String");
javaLangClassNames.add("StringBuffer");
javaLangClassNames.add("StringBuilder");
javaLangClassNames.add("StringTemplate");
javaLangClassNames.add("StringTemplate.Processor");
javaLangClassNames.add("StringTemplate.Processor.Linkage");
javaLangClassNames.add("System");
javaLangClassNames.add("System.LoggerFinder");
javaLangClassNames.add("Thread");
javaLangClassNames.add("ThreadGroup");
javaLangClassNames.add("ThreadLocal");
javaLangClassNames.add("Throwable");
javaLangClassNames.add("Void");
// Enums
javaLangClassNames.add("Character.UnicodeScript");
javaLangClassNames.add("ProcessBuilder.Redirect.Type");
javaLangClassNames.add("StackWalker.Option");
javaLangClassNames.add("System.Logger.Level");
javaLangClassNames.add("Thread.State");
// Exceptions
javaLangClassNames.add("ArithmeticException");
javaLangClassNames.add("ArrayIndexOutOfBoundsException");
javaLangClassNames.add("ArrayStoreException");
javaLangClassNames.add("ClassCastException");
javaLangClassNames.add("ClassNotFoundException");
javaLangClassNames.add("CloneNotSupportedException");
javaLangClassNames.add("EnumConstantNotPresentException");
javaLangClassNames.add("Exception");
javaLangClassNames.add("IllegalAccessException");
javaLangClassNames.add("IllegalArgumentException");
javaLangClassNames.add("IllegalCallerException");
javaLangClassNames.add("IllegalMonitorStateException");
javaLangClassNames.add("IllegalStateException");
javaLangClassNames.add("IllegalThreadStateException");
javaLangClassNames.add("IndexOutOfBoundsException");
javaLangClassNames.add("InstantiationException");
javaLangClassNames.add("InterruptedException");
javaLangClassNames.add("LayerInstantiationException");
javaLangClassNames.add("MatchException");
javaLangClassNames.add("NegativeArraySizeException");
javaLangClassNames.add("NoSuchFieldException");
javaLangClassNames.add("NoSuchMethodException");
javaLangClassNames.add("NullPointerException");
javaLangClassNames.add("NumberFormatException");
javaLangClassNames.add("ReflectiveOperationException");
javaLangClassNames.add("RuntimeException");
javaLangClassNames.add("SecurityException");
javaLangClassNames.add("StringIndexOutOfBoundsException");
javaLangClassNames.add("TypeNotPresentException");
javaLangClassNames.add("UnsupportedOperationException");
javaLangClassNames.add("WrongThreadException");
// Errors
javaLangClassNames.add("AbstractMethodError");
javaLangClassNames.add("AssertionError");
javaLangClassNames.add("BootstrapMethodError");
javaLangClassNames.add("ClassCircularityError");
javaLangClassNames.add("ClassFormatError");
javaLangClassNames.add("Error");
javaLangClassNames.add("ExceptionInInitializerError");
javaLangClassNames.add("IllegalAccessError");
javaLangClassNames.add("IncompatibleClassChangeError");
javaLangClassNames.add("InstantiationError");
javaLangClassNames.add("InternalError");
javaLangClassNames.add("LinkageError");
javaLangClassNames.add("NoClassDefFoundError");
javaLangClassNames.add("NoSuchFieldError");
javaLangClassNames.add("NoSuchMethodError");
javaLangClassNames.add("OutOfMemoryError");
javaLangClassNames.add("StackOverflowError");
javaLangClassNames.add("ThreadDeath");
javaLangClassNames.add("UnknownError");
javaLangClassNames.add("UnsatisfiedLinkError");
javaLangClassNames.add("UnsupportedClassVersionError");
javaLangClassNames.add("VerifyError");
javaLangClassNames.add("VirtualMachineError");
// Annotation Types
javaLangClassNames.add("Deprecated");
javaLangClassNames.add("FunctionalInterface");
javaLangClassNames.add("Override");
javaLangClassNames.add("SafeVarargs");
javaLangClassNames.add("SuppressWarnings");
standardPackages.put("java.lang", javaLangClassNames);
}
private Map> packageNames = new ConcurrentHashMap<>();
private Map classNames = new ConcurrentHashMap<>();
private Map> clazzes = new ConcurrentHashMap<>();
private Map> statics = new ConcurrentHashMap<>();
public ImportHandler() {
importPackage("java.lang");
}
public void importStatic(String name) throws ELException {
int lastPeriod = name.lastIndexOf('.');
if (lastPeriod < 0) {
throw new ELException(Util.message(null, "importHandler.invalidStaticName", name));
}
String className = name.substring(0, lastPeriod);
String fieldOrMethodName = name.substring(lastPeriod + 1);
Class clazz = findClass(className, true);
if (clazz == null) {
throw new ELException(Util.message(null, "importHandler.invalidClassNameForStatic", className, name));
}
boolean found = false;
for (Field field : clazz.getFields()) {
if (field.getName().equals(fieldOrMethodName)) {
int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers) && Modifier.isPublic(modifiers)) {
found = true;
break;
}
}
}
if (!found) {
for (Method method : clazz.getMethods()) {
if (method.getName().equals(fieldOrMethodName)) {
int modifiers = method.getModifiers();
if (Modifier.isStatic(modifiers) && Modifier.isPublic(modifiers)) {
found = true;
break;
}
}
}
}
if (!found) {
throw new ELException(
Util.message(null, "importHandler.staticNotFound", fieldOrMethodName, className, name));
}
Class conflict = statics.get(fieldOrMethodName);
if (conflict != null) {
throw new ELException(Util.message(null, "importHandler.ambiguousStaticImport", name,
conflict.getName() + '.' + fieldOrMethodName));
}
statics.put(fieldOrMethodName, clazz);
}
public void importClass(String name) throws ELException {
int lastPeriodIndex = name.lastIndexOf('.');
if (lastPeriodIndex < 0) {
throw new ELException(Util.message(null, "importHandler.invalidClassName", name));
}
String unqualifiedName = name.substring(lastPeriodIndex + 1);
String currentName = classNames.putIfAbsent(unqualifiedName, name);
if (currentName != null && !currentName.equals(name)) {
// Conflict. Same unqualifiedName, different fully qualified names
throw new ELException(Util.message(null, "importHandler.ambiguousImport", name, currentName));
}
}
public void importPackage(String name) {
// Import ambiguity is handled at resolution, not at import
// Whether the package exists is not checked,
// a) for sake of performance when used in JSPs (BZ 57142),
// b) java.lang.Package.getPackage(name) is not reliable (BZ 57574),
// c) such check is not required by specification.
Set preloaded = standardPackages.get(name);
if (preloaded == null) {
packageNames.put(name, Collections.emptySet());
} else {
packageNames.put(name, preloaded);
}
}
public Class resolveClass(String name) {
if (name == null || name.contains(".")) {
return null;
}
// Has it been previously resolved?
Class result = clazzes.get(name);
if (result != null) {
if (NotFound.class.equals(result)) {
return null;
} else {
return result;
}
}
// Search the class imports
String className = classNames.get(name);
if (className != null) {
Class clazz = findClass(className, true);
if (clazz != null) {
clazzes.put(name, clazz);
return clazz;
}
}
// Search the package imports - note there may be multiple matches
// (which correctly triggers an error)
for (Map.Entry> entry : packageNames.entrySet()) {
if (!entry.getValue().isEmpty()) {
// Standard package where we know all the class names
if (!entry.getValue().contains(name)) {
// Requested name isn't in the list so it isn't in this
// package so move on to next package. This allows the
// class loader look-up to be skipped.
continue;
}
}
className = entry.getKey() + '.' + name;
Class clazz = findClass(className, false);
if (clazz != null) {
if (result != null) {
throw new ELException(
Util.message(null, "importHandler.ambiguousImport", className, result.getName()));
}
result = clazz;
}
}
if (result == null) {
// Cache NotFound results to save repeated calls to findClass()
// which is relatively slow
clazzes.put(name, NotFound.class);
} else {
clazzes.put(name, result);
}
return result;
}
public Class resolveStatic(String name) {
return statics.get(name);
}
private Class findClass(String name, boolean throwException) {
Class clazz;
ClassLoader cl = Util.getContextClassLoader();
try {
clazz = cl.loadClass(name);
} catch (ClassNotFoundException e) {
return null;
}
// Class must be public, non-abstract, not an interface and (for
// Java 9+) in an exported package
JreCompat jreCompat = JreCompat.getInstance();
int modifiers = clazz.getModifiers();
if (!Modifier.isPublic(modifiers) || Modifier.isAbstract(modifiers) || Modifier.isInterface(modifiers) ||
!jreCompat.isExported(clazz)) {
if (throwException) {
throw new ELException(Util.message(null, "importHandler.invalidClass", name));
} else {
return null;
}
}
return clazz;
}
/*
* Marker class used because null values are not permitted in a ConcurrentHashMap.
*/
private static class NotFound {
}
}
