/*
    * Copyright 2002-2012 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.core.io;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URI;
  import java.net.URL;
  
  import org.springframework.core.NestedIOException;
  import org.springframework.util.Assert;
  
  /**
   * VFS based {@link Resource} implementation.
   * Supports the corresponding VFS API versions on JBoss AS 5.x as well as 6.x and 7.x.
   *
   * @author Ales Justin
   * @author Juergen Hoeller
   * @author Costin Leau
   * @since 3.0
   * @see org.jboss.virtual.VirtualFile
   * @see org.jboss.vfs.VirtualFile
   */
  public class VfsResource extends AbstractResource {
  
  	private final Object resource;
  
  
  	public VfsResource(Object resources) {
  		Assert.notNull(resources, "VirtualFile must not be null");
  		this.resource = resources;
  	}
  
  
  	public InputStream getInputStream() throws IOException {
  		return VfsUtils.getInputStream(this.resource);
  	}
  
  	@Override
  	public boolean exists() {
  		return VfsUtils.exists(this.resource);
  	}
  
  	@Override
  	public boolean isReadable() {
  		return VfsUtils.isReadable(this.resource);
  	}
  
  	@Override
  	public URL getURL() throws IOException {
  		try {
  			return VfsUtils.getURL(this.resource);
  		}
  		catch (Exception ex) {
  			throw new NestedIOException("Failed to obtain URL for file " + this.resource, ex);
  		}
  	}
  
  	@Override
  	public URI getURI() throws IOException {
  		try {
  			return VfsUtils.getURI(this.resource);
  		}
  		catch (Exception ex) {
  			throw new NestedIOException("Failed to obtain URI for " + this.resource, ex);
  		}
  	}
  
  	@Override
  	public File getFile() throws IOException {
  		return VfsUtils.getFile(this.resource);
  	}
  
  	@Override
  	public long contentLength() throws IOException {
  		return VfsUtils.getSize(this.resource);
  	}
  
  	@Override
  	public long lastModified() throws IOException {
  		return VfsUtils.getLastModified(this.resource);
  	}
  
  	@Override
 	public Resource createRelative(String relativePath) throws IOException {
 		if (!relativePath.startsWith(".") && relativePath.contains("/")) {
 			try {
 				return new VfsResource(VfsUtils.getChild(this.resource, relativePath));
 			}
 			catch (IOException ex) {
 				// fall back to getRelative
 			}
 		}
 
 		return new VfsResource(VfsUtils.getRelative(new URL(getURL(), relativePath)));
 	}
 
 	@Override
 	public String getFilename() {
 		return VfsUtils.getName(this.resource);
 	}
 
 	public String getDescription() {
 		return this.resource.toString();
 	}
 
 	@Override
 	public boolean equals(Object obj) {
 		return (obj == this || (obj instanceof VfsResource && this.resource.equals(((VfsResource) obj).resource)));
 	}
 
 	@Override
 	public int hashCode() {
 		return this.resource.hashCode();
 	}
 
 }