org.walkmod.templates.groovy.GroovyTemplateEngine Maven / Gradle / Ivy

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/* 
  Copyright (C) 2013 Raquel Pau and Albert Coroleu.
 
 Walkmod is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 Walkmod is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public License
 along with Walkmod.  If not, see .*/
package org.walkmod.templates.groovy;

import groovy.lang.Writable;
import groovy.text.GStringTemplateEngine;
import groovy.text.Template;

import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

import org.walkmod.exceptions.WalkModException;
import org.walkmod.templates.TemplateEngine;
import org.walkmod.javalang.visitors.VisitorSupport;
import org.walkmod.walkers.VisitorContext;

public class GroovyTemplateEngine extends VisitorSupport
		implements
			TemplateEngine {

	private VisitorContext context;

	private GStringTemplateEngine engine;

	private Map cache = new HashMap();
	@Override
	public void initialize(VisitorContext context, Object rootNode) {
		this.context = context;
		engine = new GStringTemplateEngine(context.getClassLoader());
		super.initialize(context, rootNode);
	}

	@Override
	public String applyTemplate(File file) {
		Template template = cache.get(file.getAbsolutePath());
		if (template == null) {
			try {
				template = engine.createTemplate(file);
			} catch (Exception e) {
				throw new WalkModException(e);
			}
		}
		Map bindings = new HashMap();
		bindings.putAll(context);
		bindings.put("query", getQueryEngine());
		Writable wr = template.make(bindings);
		StringWriter sw = new StringWriter();
		try {
			wr.writeTo(sw);
		} catch (IOException e) {
			throw new WalkModException(e);
		}
		return sw.toString();
	}

	@Override
	public String applyTemplate(File template, File properties) {
		return applyTemplate(template);
	}
	

}