org.docx4j.utils.ResourceUtils Maven / Gradle / Ivy

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docx4j is a library which helps you to work with the Office Open XML file format as used in docx documents, pptx presentations, and xlsx spreadsheets.

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/*
 *  Copyright 2007-2008, Plutext Pty Ltd.
 *   
 *  This file is part of docx4j.

    docx4j is 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.docx4j.utils;

import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ResourceUtils {
	
	protected static Logger log = LoggerFactory.getLogger(ResourceUtils.class);	
	
    /**
     * Use ClassLoader.getResource to get the named resource
     * @param filename
     * @return
     * @throws java.io.IOException if resource not found
     */
    public static java.io.InputStream getResource(String filename) throws java.io.IOException
    {
        // Try to load resource from jar.
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        if (loader == null) {  // IKVM (v.0.44.0.5) doesn't set context classloader 
            loader = ResourceUtils.class.getClassLoader();
        }
        
        java.net.URL url = loader.getResource(filename);
                
        if (url == null) {
        	if (filename.contains("jaxb.properties")){
        		log.debug("Not using MOXy, since no resource: " + filename);        		
        	} else {
        		log.warn("Couldn't get resource: " + filename);
        	}
        	throw new IOException(filename + " not found via classloader.");
        }
        
        // Get the jar file
//      JarURLConnection conn = (JarURLConnection) url.openConnection();
        java.io.InputStream is = url.openConnection().getInputStream();
        return is;
    }
	

}