toxgene.util.FileLoader Maven / Gradle / Ivy

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/**
 * 
 */
package toxgene.util;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.jar.JarFile;

/**
 * @author lord_pretzel
 *
 */
public class FileLoader {

	public static FileLoader inst = new FileLoader();

	public enum LoadMethod {
		LOAD_SYSTEM_CLASSLOADER,
		LOAD_JARFILE
	}

	private LoadMethod method = LoadMethod.LOAD_SYSTEM_CLASSLOADER; 
	private JarFile j = null; 

	public FileLoader () {
	}

	public void setupJarFileForLoading (String path) throws IOException {
		if (path == null)
		{
			String tgHome = System.getProperty("ToXgene_home");
			File p;
			
			if (tgHome == null){
				tgHome = ".";
			}
			p = new File(tgHome, "toxgene.jar");
			if (p.exists()) {
				j = new JarFile(p);
			}
			method = LoadMethod.LOAD_JARFILE;
		}
		else {
			j = new JarFile(path);
			method = LoadMethod.LOAD_JARFILE;
		}
	}

	public InputStream loadFile(String path) throws IOException {
		InputStream result = null;
		
		// try system classloader first 
		if (method == LoadMethod.LOAD_SYSTEM_CLASSLOADER)
			result = ClassLoader.getSystemResourceAsStream(path);
		
		if (result != null)
			return result;
		
		result = j.getInputStream(j.getEntry(path));
		return result;
	}

}