/*
* 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 jakarta.el;
import java.io.Serial;
public abstract class MethodExpression extends Expression {
@Serial
private static final long serialVersionUID = 8163925562047324656L;
/**
* @param context The EL context for this evaluation
*
* @return Information about the method that this expression resolves to
*
* @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 MethodNotFoundException If no matching method can be found
* @throws ELException Wraps any exception throw whilst resolving the property
*/
public abstract MethodInfo getMethodInfo(ELContext context);
/**
* @param context The EL context for this evaluation
* @param params The parameters with which to invoke this method expression
*
* @return The result of invoking this method 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 MethodNotFoundException If no matching method can be found
* @throws ELException Wraps any exception throw whilst resolving the property or coercion of the
* result to the expected return type fails
*/
public abstract Object invoke(ELContext context, Object[] params);
/**
* @return This default implementation always returns <code>false</code>
*
* @since EL 3.0
*/
public boolean isParametersProvided() {
// Expected to be over-ridden by implementation
return false;
}
/**
* Obtain the {@link MethodReference} for the method to which this method expression resolves.
*
* @param context The EL context for this evaluation
*
* @return This default implementation always returns <code>null</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 MethodNotFoundException If no matching method can be found
* @throws ELException Wraps any exception throw whilst resolving the property
*
* @since EL 5.0
*/
public MethodReference getMethodReference(ELContext context) {
// Expected to be over-ridden by implementation
context.notifyBeforeEvaluation(getExpressionString());
context.notifyAfterEvaluation(getExpressionString());
return null;
}
}