expression.java

来自「jetty SERVER連接資料庫用的軟體」· Java 代码 · 共 58 行

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/** * * Copyright 2003-2004 The Apache Software Foundation * *  Licensed 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. *///// This source code implements specifications defined by the Java// Community Process. In order to remain compliant with the specification// DO NOT add / change / or delete method signatures!//package javax.servlet.jsp.el;/** * <p>The abstract class for a prepared expression.</p> * * <p>An instance of an Expression can be obtained via from an  * ExpressionEvaluator instance.</p> * * <p>An Expression may or not have done a syntactic parse of the expression. * A client invoking the evaluate() method should be ready for the case  * where ELParseException exceptions are raised. </p> * * @since 2.0 */public abstract class Expression {    /**      * Evaluates an expression that was previously prepared.  In some      * implementations preparing an expression involves full syntactic      * validation, but others may not do so.  Evaluating the expression may      * raise an ELParseException as well as other ELExceptions due to      * run-time evaluation.     *     * @param vResolver A VariableResolver instance that can be used at      *   runtime to resolve the name of implicit objects into Objects.     * @return The result of the expression evaluation.     *     * @exception ELException Thrown if the expression evaluation failed.     */     public abstract Object evaluate( VariableResolver vResolver )        throws ELException;}

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