package org.apache.flex.forks.velocity.runtime.parser.node;
/*
* Copyright 2000-2001,2004 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.
*/
/**
* Modified by Adobe Flex.
*/
import java.io.IOException;
import java.io.Writer;
import org.apache.flex.forks.velocity.context.InternalContextAdapter;
import org.apache.flex.forks.velocity.runtime.RuntimeConstants;
import org.apache.flex.forks.velocity.runtime.parser.Parser;
import org.apache.flex.forks.velocity.exception.MethodInvocationException;
import org.apache.flex.forks.velocity.app.event.EventCartridge;
/**
* Node for the #set directive
*
* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id: ASTSetDirective.java,v 1.22.4.1 2004/03/03 23:22:59 geirm Exp $
*/
public class ASTSetDirective extends SimpleNode
{
private String leftReference = "";
private Node right;
private ASTReference left;
transient boolean blather = false;
public ASTSetDirective(int id)
{
super(id);
}
public ASTSetDirective(Parser p, int id)
{
super(p, id);
}
/** Accept the visitor. **/
public Object jjtAccept(ParserVisitor visitor, Object data)
{
return visitor.visit(this, data);
}
/**
* simple init. We can get the RHS and LHS as the the tree structure is static
*/
public Object init(InternalContextAdapter context, Object data)
throws Exception
{
/*
* init the tree correctly
*/
super.init( context, data );
blather = rsvc.getBoolean(RuntimeConstants.RUNTIME_LOG_REFERENCE_LOG_INVALID, true);
return data;
}
public void jjtClose()
{
right = getRightHandSide();
left = getLeftHandSide();
/*
* grab this now. No need to redo each time
*/
leftReference = left.getFirstTokenImage().substring(1);
}
/**
* puts the value of the RHS into the context under the key of the LHS
*/
public boolean render( InternalContextAdapter context, Writer writer)
throws IOException, MethodInvocationException
{
/*
* get the RHS node, and it's value
*/
Object value = right.value(context);
/*
* it's an error if we don't have a value of some sort
*/
if ( value == null)
{
/*
* first, are we supposed to say anything anyway?
*/
if(blather)
{
EventCartridge ec = context.getEventCartridge();
boolean doit = true;
/*
* if we have an EventCartridge...
*/
if (ec != null)
{
doit = ec.shouldLogOnNullSet( left.literal(), right.literal() );
}
if (doit)
{
rsvc.error("RHS of #set statement is null. Context will not be modified. "
+ context.getCurrentTemplateName() + " [line " + getLine()
+ ", column " + getColumn() + "]");
}
}
return false;
}
/*
* if the LHS is simple, just punch the value into the context
* otherwise, use the setValue() method do to it.
* Maybe we should always use setValue()
*/
if (left.jjtGetNumChildren() == 0)
{
context.put( leftReference, value);
}
else
{
left.setValue(context, value);
}
return true;
}
/**
* returns the ASTReference that is the LHS of the set statememt
*/
private ASTReference getLeftHandSide()
{
return (ASTReference) jjtGetChild(0);
// return (ASTReference) jjtGetChild(0).jjtGetChild(0).jjtGetChild(0);
}
/**
* returns the RHS Node of the set statement
*/
private Node getRightHandSide()
{
return jjtGetChild(1);
// return jjtGetChild(0).jjtGetChild(0).jjtGetChild(1).jjtGetChild(0);
}
}