/*
* 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 java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Iterator;
import org.apache.velocity.Template;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.parser.node.SimpleNode;
import org.apache.velocity.runtime.parser.node.ASTReference;
import org.apache.velocity.runtime.visitor.BaseVisitor;
/**
*
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id: TemplateTool.java 463298 2006-10-12 16:10:32Z henning $
*/
public class TemplateTool
{
/**
* returns a list of references in a template in the
* order that they are encountered
*/
public static List referenceList( Template template )
{
SimpleNode sn = (SimpleNode) template.getData();
ReferenceListVisitor rlv = new ReferenceListVisitor();
sn.jjtAccept( rlv, null );
return rlv.getList();
}
/**
* returns a map of references as keys, and number of times
* they are used in the template. There is no order
* information
*/
public static Map referenceHistogram( Template template )
{
/*
* get the list
*/
List list = referenceList( template );
HashMap hm = new HashMap();
int count = 0;
for( int i = 0; i < list.size(); i++)
{
String ref = (String) list.get(i);
Integer ival = (Integer) hm.get( ref );
if ( ival == null)
count = 0;
else
count = ival.intValue();
count++;
hm.put( ref, new Integer(count) );
}
return hm;
}
public static void main( String args[] )
throws Exception
{
if (args.length < 1)
{
System.out.println("Need template arg...");
return;
}
VelocityEngine ve = new VelocityEngine();
ve.init();
Template t = ve.getTemplate( args[0] );
List l = TemplateTool.referenceList( t );
System.out.println("References, in order :");
System.out.println("======================");
for( int i = 0; i < l.size(); i++)
{
System.out.println(" " + l.get(i));
}
Map m = TemplateTool.referenceHistogram( t );
System.out.println("References, with Frequency Count :");
System.out.println("==================================");
for( Iterator iter = m.keySet().iterator() ; iter.hasNext(); )
{
String key = (String) iter.next();
System.out.println(" " + key + " : " + m.get( key ) );
}
}
/**
* Visitor to accumulate references.
*/
static class ReferenceListVisitor extends BaseVisitor
{
List list = null;
ReferenceListVisitor()
{
list = new ArrayList();
}
public List getList()
{
return list;
}
public Object visit( ASTReference node, Object data)
{
String lit = node.literal();
list.add(lit);
/*
* feed the children...
*/
data = node.childrenAccept(this, data);
return data;
}
}
}