com.github.ipaas.ifw.front.directive.HtmlDirective.java Source code

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Here is the source code for com.github.ipaas.ifw.front.directive.HtmlDirective.java
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/*
 * 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 com.github.ipaas.ifw.front.directive;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang.StringUtils;

import com.github.ipaas.ifw.front.FisException;
import com.github.ipaas.ifw.front.FisResource;

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

/**
 * 
 *
 * @author Chenql
 */
public class HtmlDirective implements TemplateDirectiveModel {

    private static final String FRAMEWORK_NAME = "framework";

    private FisResource fisRes;

    public HtmlDirective(FisResource fisRes) {
        super();
        this.fisRes = fisRes;
    }

    public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body)
            throws TemplateException, IOException {
        String framework = "";
        TemplateModel paramValue = (TemplateModel) params.get(FRAMEWORK_NAME);
        if (paramValue != null) {
            framework = ((TemplateScalarModel) paramValue).getAsString();
        }

        String tagBeginHtml = tagBegin(params);

        Writer out = env.getOut();
        if (body != null) {
            try {
                if (StringUtils.isNotBlank(framework)) {
                    this.fisRes.setFramework(this.fisRes.getResourceUri(framework));
                }
                out.write(tagBeginHtml);

                StringWriter sOut = new StringWriter();
                body.render(sOut);

                out.write(this.fisRes.renderResponse(sOut.getBuffer().toString()));
            } catch (FisException e) {
                throw new TemplateException(e.getMessage(), e, env);
            }
            out.write("\n</html>");
        }

    }

    private String tagBegin(Map params) {
        String attrs = "";
        Set<String> keys = params.keySet();
        for (Iterator<String> it = keys.iterator(); it.hasNext();) {
            String key = it.next();
            if (key.equals(FRAMEWORK_NAME)) {
                continue;
            }
            attrs += " " + key + "=\"" + params.get(key) + "\";";
        }
        return "<html " + attrs + ">\n";
    }

}