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Posted to dev@velocity.apache.org by ge...@apache.org on 2002/03/27 16:45:05 UTC
cvs commit: jakarta-velocity/whiteboard/geir Local.java
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 apache@apache.org.
*
* 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:geirm@optonline.net">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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