java code for Collection: List

/*
* 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.
*/


import org.apache.velocity.app.Velocity;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.Template;

import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;

import java.io.*;
import java.util.ArrayList;

/**
* This class is a simple demonstration of how the Velocity Template Engine
* can be used in a standalone application.
*
* @author Jason van Zyl
* @author Geir Magnusson Jr.
* @version $Id: Example.java,v 1.4.8.1 2004/03/04 00:18:29 geirm Exp $
*/

public class Example
{
public Example(String templateFile)
{
try
{
/*
* setup
*/

Velocity.init("./src/velocity.properties");

/*
* Make a context object and populate with the data. This
* is where the Velocity engine gets the data to resolve the
* references (ex. $list) in the template
*/

VelocityContext context = new VelocityContext();
context.put("list", getNames());

/*
* get the Template object. This is the parsed version of your
* template input file. Note that getTemplate() can throw
* ResourceNotFoundException : if it doesn't find the template
* ParseErrorException : if there is something wrong with the VTL
* Exception : if something else goes wrong (this is generally
* indicative of as serious problem...)
*/

Template template = null;

try
{
template = Velocity.getTemplate(templateFile);
}
catch( ResourceNotFoundException rnfe )
{
System.out.println("Example : error : cannot find template " + templateFile );
}
catch( ParseErrorException pee )
{
System.out.println("Example : Syntax error in template " + templateFile + ":" + pee );
}

/*
* Now have the template engine process your template using the
* data placed into the context. Think of it as a 'merge'
* of the template and the data to produce the output stream.
*/

BufferedWriter writer = writer = new BufferedWriter(
new OutputStreamWriter(System.out));

if ( template != null)
template.merge(context, writer);

/*
* flush and cleanup
*/

writer.flush();
writer.close();
}
catch( Exception e )
{
System.out.println(e);
}
}

public ArrayList getNames()
{
ArrayList list = new ArrayList();

list.add("ArrayList element 1");
list.add("ArrayList element 2");
list.add("ArrayList element 3");
list.add("ArrayList element 4");

return list;
}

public static void main(String[] args)
{
Example t = new Example("./src/example.vm");
}
}

-------------------------------------------------------------------------------------
//File: example.vm
## This is an example velocity template

#set( $this = "Velocity")

$this is great!

#foreach( $name in $list )
$name is great!
#end

#set( $condition = true)

#if ($condition)
The condition is true!
#else
The condition is false!
#end


-------------------------------------------------------------------------------------
//File: velocity.properties
#
# This is a simple example of a velocity properties file.
#
# Any property that is not listed here will have it's default
# value used. The default values are located in :
# * src/java/org/apache/velocity/runtime/default/velocity.defaults
# * http://jakarta.apache.org/velocity/developer-guide.html
#
# as an example, we are changing the name of the velocity log
#
runtime.log = velocity_example.log