/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 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","DVSL" 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/>.
*/
package org.apache.tools.dvsl;
import java.util.Map;
import java.util.List;
import java.util.ArrayList;
import java.util.HashMap;
import java.io.Writer;
import org.apache.velocity.context.InternalContextAdapterImpl;
import org.apache.velocity.runtime.parser.node.SimpleNode;
import org.apache.velocity.context.Context;
import org.dom4j.DocumentHelper;
import org.dom4j.Document;
import org.dom4j.XPath;
import org.dom4j.Node;
import org.dom4j.rule.Pattern;
import org.dom4j.rule.Rule;
/**
* Currently provides the match rule accumulation
* as well as the AST storage and rendering
*
* Rule stuff might be replaced with the dom4j RuleManager
*
* @author <a href="mailto:geirm@apache.org?">Geir Magnusson Jr.</a>
*/
public class TemplateHandler
{
private Map astmap = new HashMap();
private List xpathList = new ArrayList();
public void registerMatch( String xpath, SimpleNode node )
{
//System.out.println("registering : " + xpath );
Pattern pattern = DocumentHelper.createPattern( xpath );
Rule rule = new Rule( pattern );
Map foo = new HashMap();
foo.put("rule", rule );
foo.put("xpath", xpath );
foo.put("ast", node );
xpathList.add( foo );
}
boolean render( DVSLNode node, Context context, Writer writer )
throws Exception
{
/*
* find if we have an AST where the xpath expression mathes
* for this node
*/
Node dom4jnode = (Node) node.getNodeImpl();
SimpleNode sn = null;
for( int i = 0; i < xpathList.size(); i++ )
{
Map m = (Map) xpathList.get(i);
Rule xpathrule = (Rule) m.get("rule");
if( xpathrule.matches( dom4jnode ) )
{
sn = (SimpleNode) m.get( "ast" );
//System.out.println("using : " + (String) m.get("xpath") );
break;
}
}
if( sn == null)
; //System.out.println("Yikes : failed to find ast for '" + node.getName() );
/*
* if we found something, render
*/
if( sn != null)
{
InternalContextAdapterImpl ica =
new InternalContextAdapterImpl( context );
ica.pushCurrentTemplateName( node.name() );
try
{
sn.render( ica, writer );
}
finally
{
ica.popCurrentTemplateName();
}
return true;
}
return false;
}
}