Spring Framework example source code file (SpringTemplateLoader.java)

This example Spring Framework source code file (SpringTemplateLoader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

could, freemarker, freemarker, io, ioexception, ioexception, object, reader, resource, resource, resourceloader, springtemplateloader, string, string, templateloader

The Spring Framework SpringTemplateLoader.java source code

/*
 * Copyright 2002-2005 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 org.springframework.ui.freemarker;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;

import freemarker.cache.TemplateLoader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

/**
 * FreeMarker TemplateLoader adapter that loads via a Spring ResourceLoader.
 * Used by FreeMarkerConfigurationFactory for any resource loader path that
 * cannot be resolved to a java.io.File.
 *
 * <p>Note that this loader does not allow for modification detection:
 * Use FreeMarker's default TemplateLoader for java.io.File resources.
 *
 * @author Juergen Hoeller
 * @since 14.03.2004
 * @see FreeMarkerConfigurationFactory#setTemplateLoaderPath
 * @see freemarker.template.Configuration#setDirectoryForTemplateLoading
 */
public class SpringTemplateLoader implements TemplateLoader {

	protected final Log logger = LogFactory.getLog(getClass());

	private final ResourceLoader resourceLoader;

	private final String templateLoaderPath;


	/**
	 * Create a new SpringTemplateLoader.
	 * @param resourceLoader the Spring ResourceLoader to use
	 * @param templateLoaderPath the template loader path to use
	 */
	public SpringTemplateLoader(ResourceLoader resourceLoader, String templateLoaderPath) {
		this.resourceLoader = resourceLoader;
		if (!templateLoaderPath.endsWith("/")) {
			templateLoaderPath += "/";
		}
		this.templateLoaderPath = templateLoaderPath;
		if (logger.isInfoEnabled()) {
			logger.info("SpringTemplateLoader for FreeMarker: using resource loader [" + this.resourceLoader +
					"] and template loader path [" + this.templateLoaderPath + "]");
		}
	}

	public Object findTemplateSource(String name) throws IOException {
		if (logger.isDebugEnabled()) {
			logger.debug("Looking for FreeMarker template with name [" + name + "]");
		}
		Resource resource = this.resourceLoader.getResource(this.templateLoaderPath + name);
		return (resource.exists() ? resource : null);
	}

	public Reader getReader(Object templateSource, String encoding) throws IOException {
		Resource resource = (Resource) templateSource;
		try {
			return new InputStreamReader(resource.getInputStream(), encoding);
		}
		catch (IOException ex) {
			if (logger.isDebugEnabled()) {
				logger.debug("Could not find FreeMarker template: " + resource);
			}
			throw ex;
		}
	}


	public long getLastModified(Object templateSource) {
		return -1;
	}

	public void closeTemplateSource(Object templateSource) throws IOException {
	}

}