struts2-javatemplates-plugin/src/main/java/org/apache/struts2/views/java/JavaTemplateEngine.java

/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.struts2.views.java;

import org.apache.struts2.StrutsException;
import org.apache.struts2.components.template.BaseTemplateEngine;
import org.apache.struts2.components.template.Template;
import org.apache.struts2.components.template.TemplateRenderingContext;
import org.apache.struts2.views.java.simple.SimpleTheme;

import java.util.HashMap;

public class JavaTemplateEngine extends BaseTemplateEngine {

    private Themes themes = new Themes() {{
        add(new SimpleTheme());
    }};

    @Override
    protected String getSuffix() {
        return "java";
    }

    public void renderTemplate(TemplateRenderingContext templateContext)
            throws Exception {
        Template t = templateContext.getTemplate();
        Theme theme = themes.get(t.getTheme());
        if (theme == null) {
            throw new StrutsException("Cannot render tag " + t.getName() + " because theme " + t.getTheme() + " is not found.");
        }
        theme.renderTag(t.getName(), templateContext);
    }

    private class Themes {
        private HashMap<String, Theme> themes = new HashMap<String, Theme>();

        public void add(Theme theme) {
            themes.put(theme.getName(), theme);
        }

        public Theme get(String name) {
            return themes.get(name);
        }
    }

}