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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package sun.net.www.protocol.file;

import java.net.InetAddress;
import java.net.URLConnection;
import java.net.URL;
import java.net.Proxy;
import java.net.MalformedURLException;
import java.net.URLStreamHandler;
import java.io.InputStream;
import java.io.IOException;
import sun.net.www.ParseUtil;
import java.io.File;

Open an file input stream given a URL.
Author: James Gosling
/** * Open an file input stream given a URL. * @author James Gosling */
public class Handler extends URLStreamHandler { private String getHost(URL url) { String host = url.getHost(); if (host == null) host = ""; return host; } protected void parseURL(URL u, String spec, int start, int limit) { /* * Ugly backwards compatibility. Flip any file separator * characters to be forward slashes. This is a nop on Unix * and "fixes" win32 file paths. According to RFC 2396, * only forward slashes may be used to represent hierarchy * separation in a URL but previous releases unfortunately * performed this "fixup" behavior in the file URL parsing code * rather than forcing this to be fixed in the caller of the URL * class where it belongs. Since backslash is an "unwise" * character that would normally be encoded if literally intended * as a non-seperator character the damage of veering away from the * specification is presumably limited. */ super.parseURL(u, spec.replace(File.separatorChar, '/'), start, limit); } public synchronized URLConnection openConnection(URL u) throws IOException { return openConnection(u, null); } public synchronized URLConnection openConnection(URL u, Proxy p) throws IOException { String host = u.getHost(); if (host == null || host.equals("") || host.equals("~") || host.equalsIgnoreCase("localhost")) { File file = new File(ParseUtil.decode(u.getPath())); return createFileURLConnection(u, file); } /* If you reach here, it implies that you have a hostname so attempt an ftp connection. */ URLConnection uc; URL ru; try { ru = new URL("ftp", host, u.getFile() + (u.getRef() == null ? "": "#" + u.getRef())); if (p != null) { uc = ru.openConnection(p); } else { uc = ru.openConnection(); } } catch (IOException e) { uc = null; } if (uc == null) { throw new IOException("Unable to connect to: " + u.toExternalForm()); } return uc; } // Template method to be overriden by Java Plug-in. [stanleyh] // protected URLConnection createFileURLConnection(URL u, File file) { return new FileURLConnection(u, file); }
Compares the host components of two URLs.
Params:
  • u1 – the URL of the first host to compare
  • u2 – the URL of the second host to compare
Returns: true if and only if they are equal, false otherwise.
/** * Compares the host components of two URLs. * @param u1 the URL of the first host to compare * @param u2 the URL of the second host to compare * @return {@code true} if and only if they * are equal, {@code false} otherwise. */
protected boolean hostsEqual(URL u1, URL u2) { /* * Special case for file: URLs * per RFC 1738 no hostname is equivalent to 'localhost' * i.e. file:///path is equal to file://localhost/path */ String s1 = u1.getHost(); String s2 = u2.getHost(); if ("localhost".equalsIgnoreCase(s1) && ( s2 == null || "".equals(s2))) return true; if ("localhost".equalsIgnoreCase(s2) && ( s1 == null || "".equals(s1))) return true; return super.hostsEqual(u1, u2); } }