org.apache.jasper.compiler.ELInterpreter Maven / Gradle / Ivy
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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 true 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.
*/
String interpreterCall(JspCompilationContext context,
boolean isTagFile, String expression,
Class expectedType, String fnmapvar);
}