/* * 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 jakarta.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<String,Set<String>> standardPackages = new HashMap<>();static {// Servlet 6.0 new HashSet<>();// Interfaces "AsyncContext" );"AsyncListener" );"Filter" );"FilterChain" );"FilterConfig" );"FilterRegistration" );"FilterRegistration.Dynamic" );"ReadListener" );"Registration" );"Registration.Dynamic" );"RequestDispatcher" );"Servlet" );"ServletConfig" );"ServletConnection" );"ServletContainerInitializer" );"ServletContext" );"ServletContextAttributeListener" );"ServletContextListener" );"ServletRegistration" );"ServletRegistration.Dynamic" );"ServletRequest" );"ServletRequestAttributeListener" );"ServletRequestListener" );"ServletResponse" );"SessionCookieConfig" );"WriteListener" );// Classes "AsyncEvent" );"GenericFilter" );"GenericServlet" );"HttpConstraintElement" );"HttpMethodConstraintElement" );"MultipartConfigElement" );"ServletContextAttributeEvent" );"ServletContextEvent" );"ServletInputStream" );"ServletOutputStream" );"ServletRequestAttributeEvent" );"ServletRequestEvent" );"ServletRequestWrapper" );"ServletResponseWrapper" );"ServletSecurityElement" );// Enums "DispatcherType" );"SessionTrackingMode" );// Exceptions "ServletException" );"UnavailableException" );"jakarta.servlet" , servletClassNames);// Servlet 6.0 new HashSet<>();// Interfaces "HttpServletMapping" );"HttpServletRequest" );"HttpServletResponse" );"HttpSession" );"HttpSessionActivationListener" );"HttpSessionAttributeListener" );"HttpSessionBindingListener" );"HttpSessionIdListener" );"HttpSessionListener" );"HttpUpgradeHandler" );"Part" );"PushBuilder" );"WebConnection" );// Classes "Cookie" );"HttpFilter" );"HttpServlet" );"HttpServletRequestWrapper" );"HttpServletResponseWrapper" );"HttpSessionBindingEvent" );"HttpSessionEvent" );"HttpUtils" );// Enums "MappingMatch" );"jakarta.servlet.http" , servletHttpClassNames);// JSP 3.0 new HashSet<>();// Interfaces "HttpJspPage" );"JspApplicationContext" );"JspPage" );// Classes "ErrorData" );"JspContext" );"JspEngineInfo" );"JspFactory" );"JspWriter" );"PageContext" );"Exceptions" );"JspException" );"JspTagException" );"SkipPageException" );"jakarta.servlet.jsp" , servletJspClassNames);new HashSet<>();// Based on Java 21 EA29 // Interfaces "Appendable" );"AutoCloseable" );"CharSequence" );"Cloneable" );"Comparable" );"Iterable" );"ProcessHandle" );"ProcessHandle.Info" );"Readable" );"Runnable" );"StackWalker.StackFrame" );"System.Logger" );"Thread.Builder" );"Thread.Builder.OfPlatform" );"Thread.Builder.OfVirtual" );"Thread.UncaughtExceptionHandler" );// Classes "Boolean" );"Byte" );"Character" );"Character.Subset" );"Character.UnicodeBlock" );"Class" );"ClassLoader" );"ClassValue" );"Compiler" );"Double" );"Enum" );"Enum.EnumDesc" );"Float" );"InheritableThreadLocal" );"Integer" );"Long" );"Math" );"Module" );"ModuleLayer" );"ModuleLayer.Controller" );"Number" );"Object" );"Package" );"Process" );"ProcessBuilder" );"ProcessBuilder.Redirect" );"Record" );"Runtime" );"Runtime.Version" );"RuntimePermission" );"ScopedValue" );"ScopedValue.Carrier" );"SecurityManager" );"Short" );"StackTraceElement" );"StackWalker" );"StrictMath" );"String" );"StringBuffer" );"StringBuilder" );"StringTemplate" );"StringTemplate.Processor" );"StringTemplate.Processor.Linkage" );"System" );"System.LoggerFinder" );"Thread" );"ThreadGroup" );"ThreadLocal" );"Throwable" );"Void" );// Enums "Character.UnicodeScript" );"ProcessBuilder.Redirect.Type" );"StackWalker.Option" );"System.Logger.Level" );"Thread.State" );// Exceptions "ArithmeticException" );"ArrayIndexOutOfBoundsException" );"ArrayStoreException" );"ClassCastException" );"ClassNotFoundException" );"CloneNotSupportedException" );"EnumConstantNotPresentException" );"Exception" );"IllegalAccessException" );"IllegalArgumentException" );"IllegalCallerException" );"IllegalMonitorStateException" );"IllegalStateException" );"IllegalThreadStateException" );"IndexOutOfBoundsException" );"InstantiationException" );"InterruptedException" );"LayerInstantiationException" );"MatchException" );"NegativeArraySizeException" );"NoSuchFieldException" );"NoSuchMethodException" );"NullPointerException" );"NumberFormatException" );"ReflectiveOperationException" );"RuntimeException" );"SecurityException" );"StringIndexOutOfBoundsException" );"TypeNotPresentException" );"UnsupportedOperationException" );"WrongThreadException" );// Errors "AbstractMethodError" );"AssertionError" );"BootstrapMethodError" );"ClassCircularityError" );"ClassFormatError" );"Error" );"ExceptionInInitializerError" );"IllegalAccessError" );"IncompatibleClassChangeError" );"InstantiationError" );"InternalError" );"LinkageError" );"NoClassDefFoundError" );"NoSuchFieldError" );"NoSuchMethodError" );"OutOfMemoryError" );"StackOverflowError" );"ThreadDeath" );"UnknownError" );"UnsatisfiedLinkError" );"UnsupportedClassVersionError" );"VerifyError" );"VirtualMachineError" );// Annotation Types "Deprecated" );"FunctionalInterface" );"Override" );"SafeVarargs" );"SuppressWarnings" );"java.lang" , javaLangClassNames);private Map<String,Set<String>> packageNames = new ConcurrentHashMap<>();private Map<String,String> classNames = new ConcurrentHashMap<>();private Map<String,Class <?>> clazzes = new ConcurrentHashMap<>();private Map<String,Class <?>> statics = new ConcurrentHashMap<>();public ImportHandler() {"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));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)) {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)) {true ;break ;if (!found) {throw new ELException(null , "importHandler.staticNotFound" , fieldOrMethodName, className, name));Class <?> conflict = statics.get(fieldOrMethodName);if (conflict != null ) {throw new ELException(Util.message(null , "importHandler.ambiguousStaticImport" , name,'.' + fieldOrMethodName));public void importClass(String name) throws ELException {int lastPeriodIndex = name.lastIndexOf('.' );if (lastPeriodIndex < 0) {throw new ELException(Util.message(null , "importHandler.invalidClassName" , 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. if (preloaded == null ) {else {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 if (className != null ) {Class <?> clazz = findClass(className, true );if (clazz != null ) {return clazz;// Search the package imports - note there may be multiple matches // (which correctly triggers an error) for (Map.Entry<String,Set<String>> 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 ;'.' + name;Class <?> clazz = findClass(className, false );if (clazz != null ) {if (result != null ) {throw new ELException(null , "importHandler.ambiguousImport" , className, result.getName()));if (result == null ) {// Cache NotFound results to save repeated calls to findClass() // which is relatively slow class );else {return result;public Class <?> resolveStatic(String name) {return statics.get(name);private Class <?> findClass(String name, boolean throwException) {Class <?> clazz;try {catch (ClassNotFoundException e) {return null ;// Class must be public, non-abstract, not an interface and in an // exported package int modifiers = clazz.getModifiers();if (!Modifier.isPublic(modifiers) || Modifier.isAbstract(modifiers) || Modifier.isInterface(modifiers) ||if (throwException) {throw new ELException(Util.message(null , "importHandler.invalidClass" , name));else {return null ;return clazz;private static boolean isExported(Class <?> type) {return module.isExported(packageName);/* * Marker class used because null values are not permitted in a ConcurrentHashMap. private static class NotFound {quality 94%
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