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/*
 * Copyright (c) 2009 Mysema Ltd.
 * All rights reserved.
 * 
 */
package com.mysema.commons.freemarker;

import java.io.IOException;
import java.io.StringWriter;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import com.mysema.commons.fluxml.XMLWriter;
import com.mysema.commons.web.ContextURL;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;

/**
 * AnchorDirective provides
 *
 * @author tiwe
 * @version $Id$
 */
public class AnchorDirective extends FreeMarkerHelper{
    
    @SuppressWarnings("unchecked")
    public void execute(Environment env, Map params, TemplateModel[] loopVars,
            TemplateDirectiveBody body) throws TemplateException, IOException {
        if (params.containsKey("href")){
            StringWriter writer = new StringWriter();
            body.render(writer);
            String href = params.get("href").toString();
            href = resolveURL(getRequest(env), params, href);
            
            // print anchor            
            XMLWriter out = new XMLWriter(env.getOut());
            out.begin("a").attribute("href", href);
            for (Map.Entry entry : ((Map)params).entrySet()){
                if (!skippedAttributes().contains(entry.getKey())){
                    out.attribute(entry.getKey(), entry.getValue().toString());                 
                }
            }            
            out.printRaw(writer.toString());
            out.end("a");
        }        
        
    }
    
    protected Collection skippedAttributes(){
    	return Arrays.asList("href");
    }
    
    @SuppressWarnings("unchecked")
	protected String resolveURL(HttpServletRequest req, Map params, String href){
    	return ContextURL.resolve(req, href);
    }
    
}