Java tutorial
// Copyright 2006 Chibacon /* * * Artistic License * * Preamble * * The intent of this document is to state the conditions under which a Package may be copied, such that * the Copyright Holder maintains some semblance of artistic control over the development of the * package, while giving the users of the package the right to use and distribute the Package in a * more-or-less customary fashion, plus the right to make reasonable modifications. * * Definitions: * * "Package" refers to the collection of files distributed by the Copyright Holder, and derivatives * of that collection of files created through textual modification. * * "Standard Version" refers to such a Package if it has not been modified, or has been modified * in accordance with the wishes of the Copyright Holder. * * "Copyright Holder" is whoever is named in the copyright or copyrights for the package. * * "You" is you, if you're thinking about copying or distributing this Package. * * "Reasonable copying fee" is whatever you can justify on the basis of media cost, duplication * charges, time of people involved, and so on. 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THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * */ package org.chiba.xml.xforms.connector.file; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.chiba.xml.dom.DOMUtil; import org.chiba.xml.xforms.connector.AbstractConnector; import org.chiba.xml.xforms.connector.URIResolver; import org.chiba.xml.xforms.exception.XFormsException; import org.w3c.dom.Document; import org.w3c.dom.Element; import javax.xml.parsers.DocumentBuilderFactory; import java.io.File; import java.net.URI; /** * This class resolves <code>file</code> URIs. It treats the denoted * <code>file</code> resource as XML and returns the parsed response. * <p/> * If the specified URI contains a fragment part, the specified element is * looked up via the <code>getElementById</code>. Thus, the parsed response must * have an internal DTD subset specifiyng all ID attributes. Otherwise the * element would not be found. * * @author Ulrich Nicolas Lissé * @version $Id: FileURIResolver.java,v 1.1 2009/02/17 09:00:53 civilis Exp $ */ public class FileURIResolver extends AbstractConnector implements URIResolver { /** * The logger. */ private static Log LOGGER = LogFactory.getLog(FileURIResolver.class); /** * Performs link traversal of the <code>file</code> URI and returns the * result as a DOM document. * * @return a DOM node parsed from the <code>file</code> URI. * @throws XFormsException if any error occurred during link traversal. */ public Object resolve() throws XFormsException { try { // create uri URI uri = new URI(getURI()); // use scheme specific part in order to handle UNC names String fileName = uri.getSchemeSpecificPart(); if (LOGGER.isDebugEnabled()) { LOGGER.debug("loading file '" + fileName + "'"); } // create file File file = new File(fileName); // check for directory if (file.isDirectory()) { return FileURIResolver.buildDirectoryListing(file); } // parse file DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setNamespaceAware(true); factory.setValidating(false); Document document = factory.newDocumentBuilder().parse(file); // check for fragment identifier if (uri.getFragment() != null) { return document.getElementById(uri.getFragment()); } return document; } catch (Exception e) { throw new XFormsException(e); } } /** * Returns a plain file listing as a document. * * @param directory the directory to list. * @return a plain file listing as a document. */ public static Document buildDirectoryListing(File directory) { Document dirList = DOMUtil.newDocument(false, false); Element root = dirList.createElement("dir"); File[] fileList = directory.listFiles(); File file; Element element; for (int i = 0; i < fileList.length; i++) { file = fileList[i]; if (file.isDirectory()) { element = dirList.createElement("dir"); } else { element = dirList.createElement("file"); } element.setAttribute("name", file.getName()); root.appendChild(element); } dirList.appendChild(root); return dirList; } } // end of class