| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.jasper.el; |
| |
| import java.util.List; |
| |
| import javax.el.ArrayELResolver; |
| import javax.el.BeanELResolver; |
| import javax.el.CompositeELResolver; |
| import javax.el.ELContext; |
| import javax.el.ELException; |
| import javax.el.ELResolver; |
| import javax.el.ListELResolver; |
| import javax.el.MapELResolver; |
| import javax.el.PropertyNotFoundException; |
| import javax.el.ResourceBundleELResolver; |
| import javax.el.StaticFieldELResolver; |
| import javax.servlet.jsp.el.ImplicitObjectELResolver; |
| import javax.servlet.jsp.el.ScopedAttributeELResolver; |
| |
| /** |
| * Jasper-specific CompositeELResolver that optimizes certain functions to avoid |
| * unnecessary resolver calls. |
| */ |
| public class JasperELResolver extends CompositeELResolver { |
| |
| private static final int STANDARD_RESOLVERS_COUNT = 9; |
| |
| private int size; |
| private ELResolver[] resolvers; |
| private final int appResolversSize; |
| |
| public JasperELResolver(List<ELResolver> appResolvers, |
| ELResolver streamResolver) { |
| appResolversSize = appResolvers.size(); |
| resolvers = new ELResolver[appResolversSize + STANDARD_RESOLVERS_COUNT]; |
| size = 0; |
| |
| add(new ImplicitObjectELResolver()); |
| for (ELResolver appResolver : appResolvers) { |
| add(appResolver); |
| } |
| add(streamResolver); |
| add(new StaticFieldELResolver()); |
| add(new MapELResolver()); |
| add(new ResourceBundleELResolver()); |
| add(new ListELResolver()); |
| add(new ArrayELResolver()); |
| add(new BeanELResolver()); |
| add(new ScopedAttributeELResolver()); |
| } |
| |
| @Override |
| public synchronized void add(ELResolver elResolver) { |
| super.add(elResolver); |
| |
| if (resolvers.length < size) { |
| resolvers[size] = elResolver; |
| } else { |
| ELResolver[] nr = new ELResolver[size + 1]; |
| System.arraycopy(resolvers, 0, nr, 0, size); |
| nr[size] = elResolver; |
| |
| resolvers = nr; |
| } |
| size ++; |
| } |
| |
| @Override |
| public Object getValue(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| context.setPropertyResolved(false); |
| |
| int start; |
| Object result = null; |
| |
| if (base == null) { |
| // call implicit and app resolvers |
| int index = 1 /* implicit */ + appResolversSize; |
| for (int i = 0; i < index; i++) { |
| result = resolvers[i].getValue(context, base, property); |
| if (context.isPropertyResolved()) { |
| return result; |
| } |
| } |
| // skip stream, static and collection-based resolvers (map, |
| // resource, list, array) and bean |
| start = index + 7; |
| } else { |
| // skip implicit resolver only |
| start = 1; |
| } |
| |
| for (int i = start; i < size; i++) { |
| result = resolvers[i].getValue(context, base, property); |
| if (context.isPropertyResolved()) { |
| return result; |
| } |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public Object invoke(ELContext context, Object base, Object method, |
| Class<?>[] paramTypes, Object[] params) { |
| String targetMethod = coerceToString(method); |
| if (targetMethod.length() == 0) { |
| throw new ELException(new NoSuchMethodException()); |
| } |
| |
| context.setPropertyResolved(false); |
| |
| Object result = null; |
| |
| // skip implicit and call app resolvers, stream resolver and static |
| // resolver |
| int index = 1 /* implicit */ + appResolversSize + |
| 2 /* stream + static */; |
| for (int i = 1; i < index; i++) { |
| result = resolvers[i].invoke( |
| context, base, targetMethod, paramTypes, params); |
| if (context.isPropertyResolved()) { |
| return result; |
| } |
| } |
| |
| // skip collection (map, resource, list, and array) resolvers |
| index += 4; |
| // call bean and the rest of resolvers |
| for (int i = index; i < size; i++) { |
| result = resolvers[i].invoke( |
| context, base, targetMethod, paramTypes, params); |
| if (context.isPropertyResolved()) { |
| return result; |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Copied from {@link org.apache.el.lang.ELSupport#coerceToString(Object)}. |
| */ |
| private static final String coerceToString(final Object obj) { |
| if (obj == null) { |
| return ""; |
| } else if (obj instanceof String) { |
| return (String) obj; |
| } else if (obj instanceof Enum<?>) { |
| return ((Enum<?>) obj).name(); |
| } else { |
| return obj.toString(); |
| } |
| } |
| } |