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java/javax/servlet/jsp/el/Expression.java

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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.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
+ * @deprecated As of JSP 2.1, replaced by javax.el.ValueExpression
+ */
+@SuppressWarnings("dep-ann") // TCK signature test fails with annotation
+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;
+}
+