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