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java/javax/servlet/jsp/el/VariableResolver.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>
+ * This class is used to customize the way an ExpressionEvaluator resolves
+ * variable references at evaluation time. For example, instances of this class
+ * can implement their own variable lookup mechanisms, or introduce the notion
+ * of "implicit variables" which override any other variables. An instance of
+ * this class should be passed when evaluating an expression.
+ * </p>
+ * <p>
+ * An instance of this class includes the context against which resolution will
+ * happen
+ * </p>
+ *
+ * @since 2.0
+ * @deprecated As of JSP 2.1, replaced by javax.el.ELResolver
+ */
+@SuppressWarnings("dep-ann")
+// TCK signature test fails with annotation
+public interface VariableResolver {
+
+    /**
+     * Resolves the specified variable. Returns null if the variable is not
+     * found.
+     *
+     * @param pName
+     *            the name of the variable to resolve
+     * @return the result of the variable resolution
+     * @throws ELException
+     *             if a failure occurred while trying to resolve the given
+     *             variable
+     */
+    public Object resolveVariable(String pName) throws ELException;
+}