835 lines
28 KiB
Java
835 lines
28 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.el;
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import java.lang.ref.WeakReference;
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import java.lang.reflect.Array;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.text.MessageFormat;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Locale;
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import java.util.Map;
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import java.util.MissingResourceException;
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import java.util.ResourceBundle;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReadWriteLock;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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class Util {
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private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
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private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
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/**
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* Checks whether the supplied Throwable is one that needs to be
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* rethrown and swallows all others.
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* @param t the Throwable to check
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*/
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static void handleThrowable(Throwable t) {
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if (t instanceof ThreadDeath) {
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throw (ThreadDeath) t;
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}
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if (t instanceof VirtualMachineError) {
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throw (VirtualMachineError) t;
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}
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// All other instances of Throwable will be silently swallowed
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}
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static String message(ELContext context, String name, Object... props) {
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Locale locale = null;
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if (context != null) {
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locale = context.getLocale();
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}
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if (locale == null) {
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locale = Locale.getDefault();
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if (locale == null) {
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return "";
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}
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}
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ResourceBundle bundle = ResourceBundle.getBundle(
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"javax.el.LocalStrings", locale);
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try {
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String template = bundle.getString(name);
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if (props != null) {
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template = MessageFormat.format(template, props);
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}
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return template;
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} catch (MissingResourceException e) {
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return "Missing Resource: '" + name + "' for Locale " + locale.getDisplayName();
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}
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}
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private static final CacheValue nullTcclFactory = new CacheValue();
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private static final ConcurrentMap<CacheKey, CacheValue> factoryCache =
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new ConcurrentHashMap<>();
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/**
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* Provides a per class loader cache of ExpressionFactory instances without
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* pinning any in memory as that could trigger a memory leak.
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*/
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static ExpressionFactory getExpressionFactory() {
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ClassLoader tccl = getContextClassLoader();
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CacheValue cacheValue = null;
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ExpressionFactory factory = null;
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if (tccl == null) {
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cacheValue = nullTcclFactory;
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} else {
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CacheKey key = new CacheKey(tccl);
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cacheValue = factoryCache.get(key);
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if (cacheValue == null) {
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CacheValue newCacheValue = new CacheValue();
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cacheValue = factoryCache.putIfAbsent(key, newCacheValue);
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if (cacheValue == null) {
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cacheValue = newCacheValue;
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}
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}
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}
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final Lock readLock = cacheValue.getLock().readLock();
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readLock.lock();
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try {
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factory = cacheValue.getExpressionFactory();
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} finally {
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readLock.unlock();
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}
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if (factory == null) {
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final Lock writeLock = cacheValue.getLock().writeLock();
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writeLock.lock();
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try {
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factory = cacheValue.getExpressionFactory();
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if (factory == null) {
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factory = ExpressionFactory.newInstance();
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cacheValue.setExpressionFactory(factory);
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}
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} finally {
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writeLock.unlock();
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}
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}
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return factory;
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}
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/**
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* Key used to cache default ExpressionFactory information per class
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* loader. The class loader reference is never {@code null}, because
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* {@code null} tccl is handled separately.
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*/
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private static class CacheKey {
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private final int hash;
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private final WeakReference<ClassLoader> ref;
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public CacheKey(ClassLoader key) {
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hash = key.hashCode();
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ref = new WeakReference<>(key);
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}
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@Override
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public int hashCode() {
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return hash;
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == this) {
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return true;
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}
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if (!(obj instanceof CacheKey)) {
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return false;
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}
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ClassLoader thisKey = ref.get();
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if (thisKey == null) {
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return false;
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}
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return thisKey == ((CacheKey) obj).ref.get();
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}
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}
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private static class CacheValue {
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private final ReadWriteLock lock = new ReentrantReadWriteLock();
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private WeakReference<ExpressionFactory> ref;
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public CacheValue() {
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}
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public ReadWriteLock getLock() {
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return lock;
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}
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public ExpressionFactory getExpressionFactory() {
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return ref != null ? ref.get() : null;
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}
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public void setExpressionFactory(ExpressionFactory factory) {
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ref = new WeakReference<>(factory);
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}
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}
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/*
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* This method duplicates code in org.apache.el.util.ReflectionUtil. When
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* making changes keep the code in sync.
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*/
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static Method findMethod(Class<?> clazz, Object base, String methodName,
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Class<?>[] paramTypes, Object[] paramValues) {
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if (clazz == null || methodName == null) {
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throw new MethodNotFoundException(
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message(null, "util.method.notfound", clazz, methodName,
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paramString(paramTypes)));
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}
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if (paramTypes == null) {
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paramTypes = getTypesFromValues(paramValues);
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}
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Method[] methods = clazz.getMethods();
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List<Wrapper<Method>> wrappers = Wrapper.wrap(methods, methodName);
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Wrapper<Method> result = findWrapper(clazz, wrappers, methodName, paramTypes, paramValues);
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return getMethod(clazz, base, result.unWrap());
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}
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/*
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* This method duplicates code in org.apache.el.util.ReflectionUtil. When
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* making changes keep the code in sync.
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*/
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@SuppressWarnings("null")
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private static <T> Wrapper<T> findWrapper(Class<?> clazz, List<Wrapper<T>> wrappers,
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String name, Class<?>[] paramTypes, Object[] paramValues) {
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Map<Wrapper<T>,MatchResult> candidates = new HashMap<>();
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int paramCount = paramTypes.length;
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for (Wrapper<T> w : wrappers) {
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Class<?>[] mParamTypes = w.getParameterTypes();
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int mParamCount;
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if (mParamTypes == null) {
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mParamCount = 0;
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} else {
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mParamCount = mParamTypes.length;
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}
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// Check the number of parameters
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// Multiple tests to improve readability
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if (!w.isVarArgs() && paramCount != mParamCount) {
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// Method has wrong number of parameters
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continue;
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}
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if (w.isVarArgs() && paramCount < mParamCount -1) {
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// Method has wrong number of parameters
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continue;
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}
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if (w.isVarArgs() && paramCount == mParamCount && paramValues != null &&
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paramValues.length > paramCount && !paramTypes[mParamCount -1].isArray()) {
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// Method arguments don't match
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continue;
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}
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if (w.isVarArgs() && paramCount > mParamCount && paramValues != null &&
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paramValues.length != paramCount) {
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// Might match a different varargs method
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continue;
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}
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if (!w.isVarArgs() && paramValues != null && paramCount != paramValues.length) {
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// Might match a different varargs method
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continue;
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}
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// Check the parameters match
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int exactMatch = 0;
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int assignableMatch = 0;
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int coercibleMatch = 0;
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boolean noMatch = false;
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for (int i = 0; i < mParamCount; i++) {
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// Can't be null
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if (w.isVarArgs() && i == (mParamCount - 1)) {
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if (i == paramCount || (paramValues != null && paramValues.length == i)) {
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// Nothing is passed as varargs
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assignableMatch++;
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break;
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}
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Class<?> varType = mParamTypes[i].getComponentType();
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for (int j = i; j < paramCount; j++) {
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if (isAssignableFrom(paramTypes[j], varType)) {
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assignableMatch++;
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} else {
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if (paramValues == null) {
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noMatch = true;
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break;
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} else {
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if (isCoercibleFrom(paramValues[j], varType)) {
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coercibleMatch++;
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} else {
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noMatch = true;
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break;
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}
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}
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}
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// Don't treat a varArgs match as an exact match, it can
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// lead to a varArgs method matching when the result
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// should be ambiguous
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}
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} else {
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if (mParamTypes[i].equals(paramTypes[i])) {
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exactMatch++;
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} else if (paramTypes[i] != null && isAssignableFrom(paramTypes[i], mParamTypes[i])) {
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assignableMatch++;
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} else {
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if (paramValues == null) {
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noMatch = true;
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break;
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} else {
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if (isCoercibleFrom(paramValues[i], mParamTypes[i])) {
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coercibleMatch++;
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} else {
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noMatch = true;
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break;
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}
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}
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}
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}
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}
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if (noMatch) {
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continue;
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}
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// If a method is found where every parameter matches exactly,
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// return it
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if (exactMatch == paramCount) {
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return w;
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}
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candidates.put(w, new MatchResult(
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exactMatch, assignableMatch, coercibleMatch, w.isBridge()));
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}
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// Look for the method that has the highest number of parameters where
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// the type matches exactly
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MatchResult bestMatch = new MatchResult(0, 0, 0, false);
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Wrapper<T> match = null;
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boolean multiple = false;
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for (Map.Entry<Wrapper<T>, MatchResult> entry : candidates.entrySet()) {
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int cmp = entry.getValue().compareTo(bestMatch);
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if (cmp > 0 || match == null) {
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bestMatch = entry.getValue();
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match = entry.getKey();
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multiple = false;
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} else if (cmp == 0) {
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multiple = true;
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}
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}
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if (multiple) {
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if (bestMatch.getExact() == paramCount - 1) {
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// Only one parameter is not an exact match - try using the
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// super class
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match = resolveAmbiguousWrapper(candidates.keySet(), paramTypes);
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} else {
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match = null;
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}
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if (match == null) {
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// If multiple methods have the same matching number of parameters
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// the match is ambiguous so throw an exception
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throw new MethodNotFoundException(message(
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null, "util.method.ambiguous", clazz, name,
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paramString(paramTypes)));
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}
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}
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// Handle case where no match at all was found
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if (match == null) {
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throw new MethodNotFoundException(message(
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null, "util.method.notfound", clazz, name,
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paramString(paramTypes)));
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}
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return match;
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}
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private static final String paramString(Class<?>[] types) {
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if (types != null) {
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < types.length; i++) {
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if (types[i] == null) {
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sb.append("null, ");
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} else {
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sb.append(types[i].getName()).append(", ");
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}
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}
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if (sb.length() > 2) {
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sb.setLength(sb.length() - 2);
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}
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return sb.toString();
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}
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return null;
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}
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/*
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* This method duplicates code in org.apache.el.util.ReflectionUtil. When
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* making changes keep the code in sync.
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*/
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private static <T> Wrapper<T> resolveAmbiguousWrapper(Set<Wrapper<T>> candidates,
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Class<?>[] paramTypes) {
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// Identify which parameter isn't an exact match
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Wrapper<T> w = candidates.iterator().next();
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int nonMatchIndex = 0;
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Class<?> nonMatchClass = null;
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for (int i = 0; i < paramTypes.length; i++) {
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if (w.getParameterTypes()[i] != paramTypes[i]) {
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nonMatchIndex = i;
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nonMatchClass = paramTypes[i];
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break;
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}
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}
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if (nonMatchClass == null) {
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// Null will always be ambiguous
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return null;
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}
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for (Wrapper<T> c : candidates) {
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if (c.getParameterTypes()[nonMatchIndex] ==
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paramTypes[nonMatchIndex]) {
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// Methods have different non-matching parameters
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// Result is ambiguous
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return null;
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}
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}
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// Can't be null
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Class<?> superClass = nonMatchClass.getSuperclass();
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while (superClass != null) {
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for (Wrapper<T> c : candidates) {
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if (c.getParameterTypes()[nonMatchIndex].equals(superClass)) {
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// Found a match
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return c;
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}
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}
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superClass = superClass.getSuperclass();
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}
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// Treat instances of Number as a special case
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Wrapper<T> match = null;
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if (Number.class.isAssignableFrom(nonMatchClass)) {
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for (Wrapper<T> c : candidates) {
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Class<?> candidateType = c.getParameterTypes()[nonMatchIndex];
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if (Number.class.isAssignableFrom(candidateType) ||
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candidateType.isPrimitive()) {
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if (match == null) {
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match = c;
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} else {
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// Match still ambiguous
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match = null;
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break;
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}
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}
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}
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}
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return match;
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}
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/*
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* This method duplicates code in org.apache.el.util.ReflectionUtil. When
|
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* making changes keep the code in sync.
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|
*/
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static boolean isAssignableFrom(Class<?> src, Class<?> target) {
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// src will always be an object
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// Short-cut. null is always assignable to an object and in EL null
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// can always be coerced to a valid value for a primitive
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if (src == null) {
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return true;
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}
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Class<?> targetClass;
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if (target.isPrimitive()) {
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if (target == Boolean.TYPE) {
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targetClass = Boolean.class;
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} else if (target == Character.TYPE) {
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targetClass = Character.class;
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} else if (target == Byte.TYPE) {
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targetClass = Byte.class;
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} else if (target == Short.TYPE) {
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targetClass = Short.class;
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} else if (target == Integer.TYPE) {
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targetClass = Integer.class;
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} else if (target == Long.TYPE) {
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targetClass = Long.class;
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} else if (target == Float.TYPE) {
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targetClass = Float.class;
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} else {
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targetClass = Double.class;
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}
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} else {
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targetClass = target;
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}
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return targetClass.isAssignableFrom(src);
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}
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|
|
|
|
|
/*
|
|
* This method duplicates code in org.apache.el.util.ReflectionUtil. When
|
|
* making changes keep the code in sync.
|
|
*/
|
|
private static boolean isCoercibleFrom(Object src, Class<?> target) {
|
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// TODO: This isn't pretty but it works. Significant refactoring would
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// be required to avoid the exception.
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try {
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getExpressionFactory().coerceToType(src, target);
|
|
} catch (ELException e) {
|
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return false;
|
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}
|
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return true;
|
|
}
|
|
|
|
|
|
private static Class<?>[] getTypesFromValues(Object[] values) {
|
|
if (values == null) {
|
|
return EMPTY_CLASS_ARRAY;
|
|
}
|
|
|
|
Class<?> result[] = new Class<?>[values.length];
|
|
for (int i = 0; i < values.length; i++) {
|
|
if (values[i] == null) {
|
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result[i] = null;
|
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} else {
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result[i] = values[i].getClass();
|
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}
|
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}
|
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return result;
|
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}
|
|
|
|
|
|
/*
|
|
* This method duplicates code in org.apache.el.util.ReflectionUtil. When
|
|
* making changes keep the code in sync.
|
|
*/
|
|
static Method getMethod(Class<?> type, Object base, Method m) {
|
|
JreCompat jreCompat = JreCompat.getInstance();
|
|
// If base is null, method MUST be static
|
|
// If base is non-null, method may be static or non-static
|
|
if (m == null ||
|
|
(Modifier.isPublic(type.getModifiers()) &&
|
|
(jreCompat.canAcccess(base, m) || base != null && jreCompat.canAcccess(null, m)))) {
|
|
return m;
|
|
}
|
|
Class<?>[] inf = type.getInterfaces();
|
|
Method mp = null;
|
|
for (int i = 0; i < inf.length; i++) {
|
|
try {
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|
mp = inf[i].getMethod(m.getName(), m.getParameterTypes());
|
|
mp = getMethod(mp.getDeclaringClass(), base, mp);
|
|
if (mp != null) {
|
|
return mp;
|
|
}
|
|
} catch (NoSuchMethodException e) {
|
|
// Ignore
|
|
}
|
|
}
|
|
Class<?> sup = type.getSuperclass();
|
|
if (sup != null) {
|
|
try {
|
|
mp = sup.getMethod(m.getName(), m.getParameterTypes());
|
|
mp = getMethod(mp.getDeclaringClass(), base, mp);
|
|
if (mp != null) {
|
|
return mp;
|
|
}
|
|
} catch (NoSuchMethodException e) {
|
|
// Ignore
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
|
|
static Constructor<?> findConstructor(Class<?> clazz, Class<?>[] paramTypes,
|
|
Object[] paramValues) {
|
|
|
|
String methodName = "<init>";
|
|
|
|
if (clazz == null) {
|
|
throw new MethodNotFoundException(
|
|
message(null, "util.method.notfound", null, methodName,
|
|
paramString(paramTypes)));
|
|
}
|
|
|
|
if (paramTypes == null) {
|
|
paramTypes = getTypesFromValues(paramValues);
|
|
}
|
|
|
|
Constructor<?>[] constructors = clazz.getConstructors();
|
|
|
|
List<Wrapper<Constructor<?>>> wrappers = Wrapper.wrap(constructors);
|
|
|
|
Wrapper<Constructor<?>> wrapper = findWrapper(clazz, wrappers, methodName, paramTypes, paramValues);
|
|
|
|
Constructor<?> constructor = wrapper.unWrap();
|
|
|
|
JreCompat jreCompat = JreCompat.getInstance();
|
|
if (!Modifier.isPublic(clazz.getModifiers()) || !jreCompat.canAcccess(null, constructor)) {
|
|
throw new MethodNotFoundException(message(
|
|
null, "util.method.notfound", clazz, methodName,
|
|
paramString(paramTypes)));
|
|
}
|
|
|
|
return constructor;
|
|
}
|
|
|
|
|
|
static Object[] buildParameters(Class<?>[] parameterTypes,
|
|
boolean isVarArgs,Object[] params) {
|
|
ExpressionFactory factory = getExpressionFactory();
|
|
Object[] parameters = null;
|
|
if (parameterTypes.length > 0) {
|
|
parameters = new Object[parameterTypes.length];
|
|
int paramCount;
|
|
if (params == null) {
|
|
params = EMPTY_OBJECT_ARRAY;
|
|
}
|
|
paramCount = params.length;
|
|
if (isVarArgs) {
|
|
int varArgIndex = parameterTypes.length - 1;
|
|
// First argCount-1 parameters are standard
|
|
for (int i = 0; (i < varArgIndex); i++) {
|
|
parameters[i] = factory.coerceToType(params[i],
|
|
parameterTypes[i]);
|
|
}
|
|
// Last parameter is the varargs
|
|
Class<?> varArgClass =
|
|
parameterTypes[varArgIndex].getComponentType();
|
|
final Object varargs = Array.newInstance(
|
|
varArgClass,
|
|
(paramCount - varArgIndex));
|
|
for (int i = (varArgIndex); i < paramCount; i++) {
|
|
Array.set(varargs, i - varArgIndex,
|
|
factory.coerceToType(params[i], varArgClass));
|
|
}
|
|
parameters[varArgIndex] = varargs;
|
|
} else {
|
|
parameters = new Object[parameterTypes.length];
|
|
for (int i = 0; i < parameterTypes.length; i++) {
|
|
parameters[i] = factory.coerceToType(params[i],
|
|
parameterTypes[i]);
|
|
}
|
|
}
|
|
}
|
|
return parameters;
|
|
}
|
|
|
|
|
|
static ClassLoader getContextClassLoader() {
|
|
ClassLoader tccl;
|
|
if (System.getSecurityManager() != null) {
|
|
PrivilegedAction<ClassLoader> pa = new PrivilegedGetTccl();
|
|
tccl = AccessController.doPrivileged(pa);
|
|
} else {
|
|
tccl = Thread.currentThread().getContextClassLoader();
|
|
}
|
|
|
|
return tccl;
|
|
}
|
|
|
|
|
|
private abstract static class Wrapper<T> {
|
|
|
|
public static List<Wrapper<Method>> wrap(Method[] methods, String name) {
|
|
List<Wrapper<Method>> result = new ArrayList<>();
|
|
for (Method method : methods) {
|
|
if (method.getName().equals(name)) {
|
|
result.add(new MethodWrapper(method));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public static List<Wrapper<Constructor<?>>> wrap(Constructor<?>[] constructors) {
|
|
List<Wrapper<Constructor<?>>> result = new ArrayList<>();
|
|
for (Constructor<?> constructor : constructors) {
|
|
result.add(new ConstructorWrapper(constructor));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public abstract T unWrap();
|
|
public abstract Class<?>[] getParameterTypes();
|
|
public abstract boolean isVarArgs();
|
|
public abstract boolean isBridge();
|
|
}
|
|
|
|
|
|
private static class MethodWrapper extends Wrapper<Method> {
|
|
private final Method m;
|
|
|
|
public MethodWrapper(Method m) {
|
|
this.m = m;
|
|
}
|
|
|
|
@Override
|
|
public Method unWrap() {
|
|
return m;
|
|
}
|
|
|
|
@Override
|
|
public Class<?>[] getParameterTypes() {
|
|
return m.getParameterTypes();
|
|
}
|
|
|
|
@Override
|
|
public boolean isVarArgs() {
|
|
return m.isVarArgs();
|
|
}
|
|
|
|
@Override
|
|
public boolean isBridge() {
|
|
return m.isBridge();
|
|
}
|
|
}
|
|
|
|
private static class ConstructorWrapper extends Wrapper<Constructor<?>> {
|
|
private final Constructor<?> c;
|
|
|
|
public ConstructorWrapper(Constructor<?> c) {
|
|
this.c = c;
|
|
}
|
|
|
|
@Override
|
|
public Constructor<?> unWrap() {
|
|
return c;
|
|
}
|
|
|
|
@Override
|
|
public Class<?>[] getParameterTypes() {
|
|
return c.getParameterTypes();
|
|
}
|
|
|
|
@Override
|
|
public boolean isVarArgs() {
|
|
return c.isVarArgs();
|
|
}
|
|
|
|
@Override
|
|
public boolean isBridge() {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This class duplicates code in org.apache.el.util.ReflectionUtil. When
|
|
* making changes keep the code in sync.
|
|
*/
|
|
private static class MatchResult implements Comparable<MatchResult> {
|
|
|
|
private final int exact;
|
|
private final int assignable;
|
|
private final int coercible;
|
|
private final boolean bridge;
|
|
|
|
public MatchResult(int exact, int assignable, int coercible, boolean bridge) {
|
|
this.exact = exact;
|
|
this.assignable = assignable;
|
|
this.coercible = coercible;
|
|
this.bridge = bridge;
|
|
}
|
|
|
|
public int getExact() {
|
|
return exact;
|
|
}
|
|
|
|
public int getAssignable() {
|
|
return assignable;
|
|
}
|
|
|
|
public int getCoercible() {
|
|
return coercible;
|
|
}
|
|
|
|
public boolean isBridge() {
|
|
return bridge;
|
|
}
|
|
|
|
@Override
|
|
public int compareTo(MatchResult o) {
|
|
int cmp = Integer.compare(this.getExact(), o.getExact());
|
|
if (cmp == 0) {
|
|
cmp = Integer.compare(this.getAssignable(), o.getAssignable());
|
|
if (cmp == 0) {
|
|
cmp = Integer.compare(this.getCoercible(), o.getCoercible());
|
|
if (cmp == 0) {
|
|
// The nature of bridge methods is such that it actually
|
|
// doesn't matter which one we pick as long as we pick
|
|
// one. That said, pick the 'right' one (the non-bridge
|
|
// one) anyway.
|
|
cmp = Boolean.compare(o.isBridge(), this.isBridge());
|
|
}
|
|
}
|
|
}
|
|
return cmp;
|
|
}
|
|
|
|
@Override
|
|
public boolean equals(Object o)
|
|
{
|
|
return o == this || (null != o &&
|
|
this.getClass().equals(o.getClass()) &&
|
|
((MatchResult)o).getExact() == this.getExact() &&
|
|
((MatchResult)o).getAssignable() == this.getAssignable() &&
|
|
((MatchResult)o).getCoercible() == this.getCoercible() &&
|
|
((MatchResult)o).isBridge() == this.isBridge());
|
|
}
|
|
|
|
@Override
|
|
public int hashCode()
|
|
{
|
|
return (this.isBridge() ? 1 << 24 : 0) ^
|
|
this.getExact() << 16 ^
|
|
this.getAssignable() << 8 ^
|
|
this.getCoercible();
|
|
}
|
|
}
|
|
|
|
|
|
private static class PrivilegedGetTccl implements PrivilegedAction<ClassLoader> {
|
|
@Override
|
|
public ClassLoader run() {
|
|
return Thread.currentThread().getContextClassLoader();
|
|
}
|
|
}
|
|
}
|