It is fully JavaDoced, but while I have tested the code that does the invocation via other means, I don't have a junit for this tag in particular.
- Robert McIntosh
/* * $Header: $ * $Revision: $ * $Date: $ * * ==================================================================== * * The Apache Software License, Version 1.1 * * Copyright (c) 2002 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, if * any, must include the following acknowlegement: * "This product includes software developed by the * Apache Software Foundation (http://www.apache.org/)." * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "The Jakarta Project", "Commons", and "Apache Software * Foundation" must not be used to endorse or promote products derived * from this software without prior written permission. For written * permission, please contact [EMAIL PROTECTED] * * 5. Products derived from this software may not be called "Apache" * nor may "Apache" appear in their names without prior written * permission of the Apache Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * * $Id: $ */ package org.apache.commons.jelly.tags.core;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.beanutils.MethodUtils;
import org.apache.commons.jelly.MissingAttributeException;
import org.apache.commons.jelly.TagSupport;
import org.apache.commons.jelly.XMLOutput;
/**
* <p>
* A Tag which can invoke a static method on a class, without an
* instance of the class being needed.
* </p>
* <p>
* Like the {@link InvokeTag}, this tag can take a set of
* arguments using the {@link ArgTag}.
* </p>
* <p>
* The following attributes are required:<br />
* <ul>
* <li>var - The variable to assign the return of the method call to</li>
* <li>method - The name of the static method to invoke</li>
* <li>className - The name of the class containing the static method</li>
* </ul>
* </p>
*
* @author <a href="mailto:[EMAIL PROTECTED]>Robert McIntosh</a>
* @version $Revision: $
*/
public class InvokeTag extends TagSupport implements ArgTagParent {
/** the variable exported */
private String var;
/** the method to invoke */
private String methodName;
/** the object to invoke the method on */
private String className;
private List paramTypes = new ArrayList();
private List paramValues = new ArrayList();
public InvokeStaticTag() {
}
/**
* Sets the name of the variable exported by this tag
*
* @param var The variable name
*/
public void setVar(String var) {
this.var = var;
}
/**
* Sets the name of the method to invoke
*
* @param method The method name
*/
public void setMethod(String method) {
this.methodName = method;
}
/**
* Sets the fully qualified class name containing the static method
*
* @param className The name of the class
*/
public void setClassName(String className) {
this.className = className;
}
/**
* Adds an argument to supply to the method
*
* @param type The Class type of the argument
* @param value The value of the argument
*/
public void addArgument(Class type, Object value) {
paramTypes.add(type);
paramValues.add(value);
}
// Tag interface
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws Exception {
if ( null == methodName) {
throw new MissingAttributeException( "method" );
}
if ( null == onInstance ) {
throw new MissingAttributeException( "className" );
}
invokeBody(output);
Object[] values = paramValues.toArray();
Class[] types = (Class[])(paramTypes.toArray(new Class[paramTypes.size()]));
Method method = Class.forName( className ).getMethod( method, types );
Object result = method.invoke( null, values );
paramTypes.clear();
paramValues.clear();
ArgTag parentArg = (ArgTag)(findAncestorWithClass(ArgTag.class));
if(null != parentArg) {
parentArg.setValue(result);
}
if(null != var) {
context.setVariable(var, result);
}
}
}
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