net.sf.gluebooster.java.booster.basic.resources.FileResourceSystem Maven / Gradle / Ivy

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package net.sf.gluebooster.java.booster.basic.resources;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;

import net.sf.gluebooster.java.booster.essentials.container.ResourceSystem;
import net.sf.gluebooster.java.booster.essentials.utils.Check;

/**
 * A resource system using the file system.
 * 
 * @author CBauer
 * 
 */
public class FileResourceSystem implements ResourceSystem {

	/**
	 * If this file is set, all relative paths are relative to this directory
	 */
	private File rootDirectory = null;

	public FileResourceSystem() {
	}

	public FileResourceSystem(File rootDirectory) {
		this.rootDirectory = rootDirectory;
	}

	@Override
	public OutputStream getOutputStream(Object resourceID) throws Exception {
		
		File file = asFile( resourceID);
		file.getParentFile().mkdirs(); //to prevent exceptions if no parent exists
		return new FileOutputStream(file);
	}
	
	

	@Override
	public InputStream getInputStream(Object resourceID) throws Exception {
		File file = asFile( resourceID);
		return new FileInputStream(file);
	}

	/**
	 * Convert a to a file.
	 * 
	 * @param resourceID
	 *            must be a file or a filename
	 * @return the converted id
	 */
	private File asFile(Object resourceID){
		File result;

		if (resourceID == null) {
			result = null;
		} else if (resourceID instanceof File) {
			result = (File) resourceID;
		} else {
			result = new File(resourceID.toString());
		}

		if (result != null && rootDirectory != null) {
			if (!result.toString().startsWith(rootDirectory.toString())) {
				result = new File(rootDirectory, result.toString());
			}
		}

		return result;

	}
	
	/**
	 * Supported are File and String.
	 */
	@Override
	public boolean isResourceIDSupported(Object resourceID) {
		return resourceID instanceof File || resourceID instanceof String;
	}

	@Override
	public URL getUrl(Object resourceID)throws Exception{
		return asFile(resourceID).toURL();
	}

	@Override
	public boolean isWritable() {
		return true;
	}
	
	@Override
	public Object createDirectory(Object parentResourceId, Object newResourceId)
			throws Exception {
		Check.notNull(newResourceId, "newResourceId");

		File result = null;
		File parentFile = null;
		if (parentResourceId != null) {
			parentFile = asFile(parentResourceId);

			if (newResourceId instanceof String)
				if (parentFile != null)
					result = new File(parentFile, (String) newResourceId);
				else
					result = new File((String) newResourceId);
		} else {
			result = asFile(newResourceId);
		}

		result.mkdirs();
		return result;
	}

}