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products/Sources/formale Sprachen/Java/Tomcat/java/jakarta/el/ (Apache Software Stiftung Version 11.0^©) Datei vom 10.10.2023 mit Größe 3 kB

Quelle MethodExpression.java Sprache: JAVA

/*
* 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;

public abstract class MethodExpression extends Expression {

    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;
    }
}

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