JUnit tests can be found here.
/* * Copyright 2003-2004 The Apache Software Foundation. * * Licensed 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.velocity.tools.generic.directive; import java.io.IOException; import java.io.Writer; import org.apache.velocity.context.InternalContextAdapter; import org.apache.velocity.exception.MethodInvocationException; import org.apache.velocity.exception.ParseErrorException; import org.apache.velocity.exception.ResourceNotFoundException; import org.apache.velocity.runtime.directive.Directive; import org.apache.velocity.runtime.parser.node.Node; /** * @author <a href="mailto:shinobu@ieee.org">Shinobu Kawai</a> * @version $Id: $ */ public class Ifnull extends Directive { /* (non-Javadoc) * @see org.apache.velocity.runtime.directive.Directive#getName() */ public String getName() { return "ifnull"; } /* (non-Javadoc) * @see org.apache.velocity.runtime.directive.Directive#getType() */ public int getType() { return BLOCK; } /* (non-Javadoc) * @see org.apache.velocity.runtime.directive.Directive#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer, org.apache.velocity.runtime.parser.node.Node) */ public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException { Object value = node.jjtGetChild(0).value(context); if (value == null) { Node content = node.jjtGetChild(1); content.render(context, writer); } return true; } } |