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