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java/org/apache/jasper/compiler/ELInterpreter.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 org.apache.jasper.compiler;
+
+import org.apache.jasper.JspCompilationContext;
+
+/**
+ * Defines the interface for the expression language interpreter. This allows
+ * users to provide custom EL interpreter implementations that can optimise
+ * EL processing for an application by , for example, performing code generation
+ * for simple expressions.
+ */
+public interface ELInterpreter {
+
+    /**
+     * Returns the string representing the code that will be inserted into the
+     * servlet generated for JSP. The default implementation creates a call to
+     * {@link org.apache.jasper.runtime.PageContextImpl#proprietaryEvaluate(
+     * String, Class, javax.servlet.jsp.PageContext,
+     * org.apache.jasper.runtime.ProtectedFunctionMapper)} but other
+     * implementations may produce more optimised code.
+     * @param context The compilation context
+     * @param isTagFile <code>true</code> if in a tag file rather than a JSP
+     * @param expression a String containing zero or more "${}" expressions
+     * @param expectedType the expected type of the interpreted result
+     * @param fnmapvar Variable pointing to a function map.
+     * @return a String representing a call to the EL interpreter.
+     */
+    public String interpreterCall(JspCompilationContext context,
+            boolean isTagFile, String expression,
+            Class<?> expectedType, String fnmapvar);
+}