107 lines
4.1 KiB
Java
107 lines
4.1 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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public abstract class ValueExpression extends Expression {
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private static final long serialVersionUID = 8577809572381654673L;
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/**
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* @param context The EL context for this evaluation
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*
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* @return The result of evaluating this value expression
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*
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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 a property/variable resolution failed because no match
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* was found or a match was found but was not readable
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* @throws ELException
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* Wraps any exception throw whilst resolving a property or
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* variable
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*/
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public abstract Object getValue(ELContext context);
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/**
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* @param context The EL context for this evaluation
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* @param value The value to set the property to which this value
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* expression refers
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*
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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 a property/variable resolution failed because no match
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* was found
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* @throws PropertyNotWritableException
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* If a property/variable resolution failed because a match was
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* found but was not writable
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* @throws ELException
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* Wraps any exception throw whilst resolving a property or
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* variable
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*/
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public abstract void setValue(ELContext context, Object value);
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/**
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* @param context The EL context for this evaluation
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*
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* @return <code>true</code> if this expression is read only otherwise
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* <code>false</code>
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*
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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 a property/variable resolution failed because no match
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* was found or a match was found but was not readable
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* @throws ELException
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* Wraps any exception throw whilst resolving a property or
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* variable
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*/
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public abstract boolean isReadOnly(ELContext context);
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/**
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* @param context The EL context for this evaluation
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*
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* @return The type of the result of this value expression
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*
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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 a property/variable resolution failed because no match
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* was found or a match was found but was not readable
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* @throws ELException
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* Wraps any exception throw whilst resolving a property or
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* variable
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*/
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public abstract Class<?> getType(ELContext context);
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public abstract Class<?> getExpectedType();
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/**
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* @param context The EL context for this evaluation
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*
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* @return This default implementation always returns <code>null</code>
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*
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* @since EL 2.2
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*/
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public ValueReference getValueReference(ELContext context) {
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// Expected to be over-ridden by implementation
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context.notifyBeforeEvaluation(getExpressionString());
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context.notifyAfterEvaluation(getExpressionString());
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return null;
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}
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}
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