| /* |
| * 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.util.Iterator; |
| |
| /** |
| * @author Jacob Hookom [jacob/hookom.net] |
| * |
| */ |
| public abstract class ELResolver { |
| |
| public static final String TYPE = "type"; |
| |
| public static final String RESOLVABLE_AT_DESIGN_TIME = "resolvableAtDesignTime"; |
| |
| /** |
| * @param context The EL context for this evaluation |
| * @param base The base object on which the property is to be found |
| * @param property The property whose value is to be returned |
| * @return the value of the provided property |
| * @throws NullPointerException |
| * If the supplied context is <code>null</code> |
| * @throws PropertyNotFoundException |
| * If the base/property combination provided to the resolver is |
| * one that the resolver can handle but no match was found or a |
| * match was found but was not readable |
| * @throws ELException |
| * Wraps any exception throw whilst resolving the property |
| */ |
| public abstract Object getValue(ELContext context, Object base, |
| Object property); |
| |
| /** |
| * Invokes a method on the the given object. This default implementation |
| * always returns <code>null</code>. |
| * |
| * @param context The EL context for this evaluation |
| * @param base The base object on which the method is to be found |
| * @param method The method to invoke |
| * @param paramTypes The types of the parameters of the method to invoke |
| * @param params The parameters with which to invoke the method |
| * |
| * @return Always <code>null</code> |
| * |
| * @since EL 2.2 |
| */ |
| public Object invoke(ELContext context, Object base, Object method, |
| Class<?>[] paramTypes, Object[] params) { |
| return null; |
| } |
| |
| /** |
| * @param context The EL context for this evaluation |
| * @param base The base object on which the property is to be found |
| * @param property The property whose type is to be returned |
| * @return the type of the provided property |
| * @throws NullPointerException |
| * If the supplied context is <code>null</code> |
| * @throws PropertyNotFoundException |
| * If the base/property combination provided to the resolver is |
| * one that the resolver can handle but no match was found or a |
| * match was found but was not readable |
| * @throws ELException |
| * Wraps any exception throw whilst resolving the property |
| */ |
| public abstract Class<?> getType(ELContext context, Object base, |
| Object property); |
| |
| /** |
| * @param context The EL context for this evaluation |
| * @param base The base object on which the property is to be found |
| * @param property The property whose value is to be set |
| * @param value The value to set the property to |
| * @throws NullPointerException |
| * If the supplied context is <code>null</code> |
| * @throws PropertyNotFoundException |
| * If the base/property combination provided to the resolver is |
| * one that the resolver can handle but no match was found |
| * @throws PropertyNotWritableException |
| * If the base/property combination provided to the resolver is |
| * one that the resolver can handle but the property was not |
| * writable |
| * @throws ELException |
| * Wraps any exception throw whilst resolving the property |
| */ |
| public abstract void setValue(ELContext context, Object base, |
| Object property, Object value); |
| |
| /** |
| * @param context The EL context for this evaluation |
| * @param base The base object on which the property is to be found |
| * @param property The property to be checked for read only status |
| * @return <code>true</code> if the identified property is read only, |
| * otherwise <code>false</code> |
| * @throws NullPointerException |
| * If the supplied context is <code>null</code> |
| * @throws PropertyNotFoundException |
| * If the base/property combination provided to the resolver is |
| * one that the resolver can handle but no match was found |
| * @throws ELException |
| * Wraps any exception throw whilst resolving the property |
| */ |
| public abstract boolean isReadOnly(ELContext context, Object base, |
| Object property); |
| |
| public abstract Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base); |
| |
| public abstract Class<?> getCommonPropertyType(ELContext context, |
| Object base); |
| |
| /** |
| * Converts the given object to the given type. This default implementation |
| * always returns <code>null</code>. |
| * |
| * @param context The EL context for this evaluation |
| * @param obj The object to convert |
| * @param type The type to which the object should be converted |
| * |
| * @return Always <code>null</code> |
| * |
| * @since EL 3.0 |
| */ |
| public Object convertToType(ELContext context, Object obj, Class<?> type) { |
| context.setPropertyResolved(false); |
| return null; |
| } |
| } |