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* The Apache Software License, Version 1.1
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* Copyright (c) 1999 The Apache Software Foundation. All rights
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* ====================================================================
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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package org.apache.commons.el;
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import java.util.List;
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import java.util.Iterator;
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import java.lang.reflect.*;
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import javax.servlet.jsp.el.ELException;
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import javax.servlet.jsp.el.VariableResolver;
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import javax.servlet.jsp.el.FunctionMapper;
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* <p>Represents a function call.</p>
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* @author Shawn Bayern (in the style of Nathan's other classes)
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public class FunctionInvocation
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//-------------------------------------
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//-------------------------------------
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private String functionName;
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private List argumentList;
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public String getFunctionName() { return functionName; }
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public void setFunctionName(String f) { functionName = f; }
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public List getArgumentList() { return argumentList; }
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public void setArgumentList(List l) { argumentList = l; }
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//-------------------------------------
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public FunctionInvocation (String functionName, List argumentList)
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this.functionName = functionName;
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this.argumentList = argumentList;
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//-------------------------------------
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//-------------------------------------
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* Returns the expression in the expression language syntax
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public String getExpressionString ()
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StringBuffer b = new StringBuffer();
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b.append(functionName);
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Iterator i = argumentList.iterator();
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while (i.hasNext()) {
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b.append(((Expression) i.next()).getExpressionString());
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//-------------------------------------
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* Evaluates by looking up the name in the VariableResolver
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public Object evaluate (VariableResolver pResolver,
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FunctionMapper functions,
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// if the Map is null, then the function is invalid
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if (functions == null)
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pLogger.logError(Constants.UNKNOWN_FUNCTION, functionName);
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// normalize function name
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String prefix = null;
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String localName = null;
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int index = functionName.indexOf( ':' );
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localName = functionName;
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prefix = functionName.substring( 0, index );
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localName = functionName.substring( index + 1 );
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// ensure that the function's name is mapped
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Method target = (Method) functions.resolveFunction(prefix, localName);
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pLogger.logError(Constants.UNKNOWN_FUNCTION, functionName);
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// ensure that the number of arguments matches the number of parameters
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Class[] params = target.getParameterTypes();
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if (params.length != argumentList.size())
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pLogger.logError(Constants.INAPPROPRIATE_FUNCTION_ARG_COUNT,
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functionName, new Integer(params.length),
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new Integer(argumentList.size()));
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// now, walk through each parameter, evaluating and casting its argument
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Object[] arguments = new Object[argumentList.size()];
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for (int i = 0; i < params.length; i++) {
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arguments[i] = ((Expression) argumentList.get(i)).evaluate(pResolver,
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arguments[i] = Coercions.coerce(arguments[i], params[i], pLogger);
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// finally, invoke the target method, which we know to be static
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return (target.invoke(null, arguments));
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} catch (InvocationTargetException ex) {
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pLogger.logError(Constants.FUNCTION_INVOCATION_ERROR,
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ex.getTargetException(),
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} catch (Exception ex) {
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pLogger.logError(Constants.FUNCTION_INVOCATION_ERROR, ex, functionName);
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//-------------------------------------