package org.apache.velocity.runtime.directive;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
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 463298 2006-10-12 16:10:32Z henning $
*/
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;
}
}