Quelle ValueExpression.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 ValueExpression extends Expression {

    private static final long serialVersionUID = 8577809572381654673L;

    /**
     * @param <T>     The expected type for the result of evaluating this value expression
     * @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 <T> T 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;
    }
}

quality100%

¤ Dauer der Verarbeitung: 0.21 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.