javax.servlet.jsp.el.VariableResolver.java Source code

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/*
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 * Copyright 2004 The Apache Software Foundation
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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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>
 *
 * @deprecated As of JSP 2.1, replaced by {@link javax.el.ELResolver}
 * @since JSP 2.0
 */
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;

    //-------------------------------------
}