org.beangle.struts2.view.template.AbstractTemplateEngine.java Source code

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Here is the source code for org.beangle.struts2.view.template.AbstractTemplateEngine.java

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/* Copyright c 2005-2012.
 * Licensed under GNU  LESSER General Public License, Version 3.
 * http://www.gnu.org/licenses
 */
package org.beangle.struts2.view.template;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.lang.StringUtils;
import org.beangle.commons.lang.StrUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.opensymphony.xwork2.util.ClassLoaderUtil;

/**
 * @author chaostone
 * @version $Id: AbstractTemplateEngine.java May 2, 2011 7:38:27 PM chaostone $
 */
public abstract class AbstractTemplateEngine implements TemplateEngine {
    private static final Logger logger = LoggerFactory.getLogger(AbstractTemplateEngine.class);
    final Map<String, Properties> themeProps = new HashMap<String, Properties>();
    public static final String DEFAULT_THEME_PROPERTIES_FILE_NAME = "theme.properties";

    public Properties getThemeProps(String theme) {
        Properties props = themeProps.get(theme);
        if (props == null) {
            props = loadProperties(StrUtils.concat("template/", theme, "/", DEFAULT_THEME_PROPERTIES_FILE_NAME));
            themeProps.put(theme, props);
        }
        return props;
    }

    private Properties loadProperties(String propName) {
        InputStream is = ClassLoaderUtil.getResourceAsStream(propName, getClass());
        Properties props = new Properties();
        if (is != null) {
            try {
                props.load(is);
            } catch (IOException e) {
                logger.error("Could not load " + propName, e);
            } finally {
                try {
                    is.close();
                } catch (IOException io) {
                    logger.warn("Unable to close input stream", io);
                }
            }
        }
        return props;
    }

    public String getParentTemplate(String template) {
        int start = StringUtils.indexOf(template, '/', 1) + 1;
        int end = StringUtils.lastIndexOf(template, '/');

        String parentTheme = (String) getThemeProps(template.substring(start, end)).get("parent");
        if (null == parentTheme)
            return null;
        return StrUtils.concat(template.substring(0, start), parentTheme, template.substring(end));
    }

}