net.ymate.platform.mvc.web.support.TemplateHelper.java Source code

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Here is the source code for net.ymate.platform.mvc.web.support.TemplateHelper.java

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/*
 * Copyright 2007-2107 the original author or authors.
 *
 * 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.
 */
package net.ymate.platform.mvc.web.support;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import net.ymate.platform.commons.util.FileUtils;
import net.ymate.platform.commons.util.RuntimeUtils;
import net.ymate.platform.mvc.web.WebMVC;

import org.apache.commons.lang.StringUtils;

import freemarker.cache.FileTemplateLoader;
import freemarker.cache.MultiTemplateLoader;
import freemarker.cache.TemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.TemplateExceptionHandler;

/**
 * <p>
 * TemplateHelper
 * </p>
 * <p>
 * ??;
 * </p>
 * 
 * @author (suninformation@163.com)
 * @version 0.0.0
 *          <table style="border:1px solid gray;">
 *          <tr>
 *          <th width="100px">?</th><th width="100px"></th><th
 *          width="100px"></th><th width="100px"></th>
 *          </tr>
 *          <!--  Table ?? -->
 *          <tr>
 *          <td>0.0.0</td>
 *          <td></td>
 *          <td></td>
 *          <td>2013-7-9?10:27:36</td>
 *          </tr>
 *          </table>
 */
public class TemplateHelper {

    private static Configuration __FREEMARKER_CONFIG;

    private static String __ROOT_VIEW_PATH;

    private static String __PLUGIN_VIEW_PATH;

    private static Object __LOCKER = new Object();

    /**
     * @return ?'/WEB-INF''/'?
     */
    public static String getRootViewPath() {
        if (__ROOT_VIEW_PATH == null) {
            synchronized (__LOCKER) {
                String _viewBasePath = StringUtils.trimToNull(WebMVC.getConfig().getViewPath());
                if (_viewBasePath == null
                        || !(_viewBasePath = _viewBasePath.replaceAll("\\\\", "/")).startsWith("/WEB-INF/")) {
                    _viewBasePath = "/WEB-INF/templates/";
                } else if (!_viewBasePath.endsWith("/")) {
                    _viewBasePath += "/";
                }
                __ROOT_VIEW_PATH = _viewBasePath;
            }
        }
        return __ROOT_VIEW_PATH;
    }

    /**
     * @return ??'/WEB-INF''/'?
     */
    public static String getPluginViewPath() {
        if (__PLUGIN_VIEW_PATH == null) {
            synchronized (__LOCKER) {
                String _pHome = WebMVC.getConfig().getPluginHome();
                if (StringUtils.isNotBlank(_pHome)
                        && (_pHome = _pHome.replaceAll("\\\\", "/")).contains("/WEB-INF/")) {
                    __PLUGIN_VIEW_PATH = StringUtils.substring(_pHome, _pHome.indexOf("/WEB-INF/"));
                    if (!__PLUGIN_VIEW_PATH.endsWith("/")) {
                        __PLUGIN_VIEW_PATH += "/";
                    }
                } else {
                    __PLUGIN_VIEW_PATH = "/WEB-INF/plugins/"; // WebJSP(??JSP), "/WEB-INF/plugins/
                }
            }
        }
        return __PLUGIN_VIEW_PATH;
    }

    /**
     * @return ?Freemarker??, ?()
     */
    public static Configuration getFreemarkerConfiguration() {
        if (__FREEMARKER_CONFIG == null) {
            synchronized (__LOCKER) {
                __FREEMARKER_CONFIG = new Configuration();
                __FREEMARKER_CONFIG.setDefaultEncoding("UTF-8");
                __FREEMARKER_CONFIG.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);
                //
                List<TemplateLoader> _tmpLoaders = new ArrayList<TemplateLoader>();
                try {
                    _tmpLoaders.add(new FileTemplateLoader(new File(RuntimeUtils.getRootPath(),
                            StringUtils.substringAfter(getRootViewPath(), "/WEB-INF/"))));
                    //
                    _tmpLoaders.add(new FileTemplateLoader(new File(RuntimeUtils.getRootPath(),
                            StringUtils.substringAfter(getPluginViewPath(), "/WEB-INF/"))));
                    //
                    _tmpLoaders.add(new FileTemplateLoader((new File(WebMVC.getConfig().getPluginHome()))));
                } catch (IOException e) {
                    throw new Error(RuntimeUtils.unwrapThrow(e));
                }
                __FREEMARKER_CONFIG
                        .setTemplateLoader(new MultiTemplateLoader(_tmpLoaders.toArray(new TemplateLoader[0])));
            }
        }
        return __FREEMARKER_CONFIG;
    }

}