geirm 02/03/27 07:45:05 Added: whiteboard/geir Local.java Log: give it a whirl... Revision Changes Path 1.1 jakarta-velocity/whiteboard/geir/Local.java Index: Local.java =================================================================== package org.apache.velocity.runtime.directive; /* * 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", "Velocity", 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/>. */ import org.apache.velocity.runtime.RuntimeServices; import org.apache.velocity.runtime.parser.node.Node; import org.apache.velocity.runtime.parser.node.ASTReference; import org.apache.velocity.runtime.parser.node.SimpleNode; import org.apache.velocity.context.InternalContextAdapter; import org.apache.velocity.exception.MethodInvocationException; import org.apache.velocity.exception.ResourceNotFoundException; import org.apache.velocity.exception.ParseErrorException; import java.io.Writer; import java.io.IOException; import java.util.ArrayList; /** * Simple implementation of a 'context protector', as desired by * Christoph Reck. Used like * * #local($a $b $c ) * ... * #end * * and restores the value of the reference at the end of the block * Assumes that you can #set() the value of any reference in the list * * @author <a href="mailto:[EMAIL PROTECTED]";>Geir Magnusson Jr.</a> * @version $Id: Local.java,v 1.1 2002/03/27 15:45:05 geirm Exp $ */ public class Local extends Directive { protected Object[] refList; protected Node block; /** * Return name of this directive. */ public String getName() { return "local"; } /** * Return type of this directive. */ public int getType() { return BLOCK; } /** * */ public void init(RuntimeServices rs, InternalContextAdapter context, Node node) throws Exception { super.init( rs, context, node ); int numchildren = node.jjtGetNumChildren(); ArrayList al = new ArrayList(); /* * get all the references in our arg list */ for (int i=0; i < numchildren-1; i++) { SimpleNode sn = (SimpleNode) node.jjtGetChild(i); if (sn instanceof ASTReference ) { al.add(sn); } else { throw new Exception("Arg " + i + " not a reference."); } } refList = al.toArray(); block = node.jjtGetChild(node.jjtGetNumChildren() - 1); } /** * */ public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException { /* * get the current values for the references we have */ ArrayList vals = new ArrayList(); for (int i = 0; i < refList.length; i++) { Object o = ((ASTReference) refList[i]).value(context); vals.add(o); } /* * now render the block */ boolean retVal = block.render(context, writer); /* * now restore the original values */ for (int i = 0; i < refList.length; i++) { ASTReference astr = (ASTReference) refList[i]; astr.setValue(context, vals.get(i)); } return true; } }
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