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| author | Tom Tromey <tromey@gcc.gnu.org> | 2005-07-16 00:30:23 +0000 |
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| committer | Tom Tromey <tromey@gcc.gnu.org> | 2005-07-16 00:30:23 +0000 |
| commit | f911ba985aa7fe0096c386c5be385ac5825ea527 (patch) | |
| tree | a0b991cf5866ae1d616639b906ac001811d74508 /libjava/classpath/java/net/ContentHandler.java | |
| parent | 6f4434b39b261de5317dc81ddfdd94d2e1d62b11 (diff) | |
| download | gcc-f911ba985aa7fe0096c386c5be385ac5825ea527.zip gcc-f911ba985aa7fe0096c386c5be385ac5825ea527.tar.gz gcc-f911ba985aa7fe0096c386c5be385ac5825ea527.tar.bz2 | |
Initial revision
From-SVN: r102074
Diffstat (limited to 'libjava/classpath/java/net/ContentHandler.java')
| -rw-r--r-- | libjava/classpath/java/net/ContentHandler.java | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/libjava/classpath/java/net/ContentHandler.java b/libjava/classpath/java/net/ContentHandler.java new file mode 100644 index 0000000..7f63e74 --- /dev/null +++ b/libjava/classpath/java/net/ContentHandler.java @@ -0,0 +1,126 @@ +/* ContentHandler.java -- Abstract class for handling content from URL's + Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package java.net; + +import java.io.IOException; + +/** + * Written using on-line Java Platform 1.2 API Specification, as well + * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998). + * Status: Believed complete and correct. + */ + +/** + * This is an abstract class that is the superclass for classes that read + * objects from URL's. Calling the <code>getContent()</code> method in the + * <code>URL</code> class or the <code>URLConnection</code> class will cause + * an instance of a subclass of <code>ContentHandler</code> to be created for + * the MIME type of the object being downloaded from the URL. Thus, this + * class is seldom needed by applications/applets directly, but only + * indirectly through methods in other classes. + * + * @author Aaron M. Renn (arenn@urbanophile.com) + * @author Warren Levy (warrenl@cygnus.com) + */ +public abstract class ContentHandler +{ + /* + * Constructors + */ + + /** + * Default, no-argument constructor. + */ + public ContentHandler() + { + } + + /* + * Instance Methods + */ + + /** + * This method reads from the <code>InputStream</code> of the passed in URL + * connection and uses the data downloaded to create an <code>Object</code> + * represening the content. For example, if the URL is pointing to a GIF + * file, this method might return an <code>Image</code> object. This method + * must be implemented by subclasses. + * + * @param urlc A <code>URLConnection</code> object to read data from. + * + * @return An object representing the data read + * + * @exception IOException If an error occurs + */ + public abstract Object getContent(URLConnection urlc) + throws IOException; + + /** + * This method reads from the <code>InputStream</code> of the passed in URL + * connection and uses the data downloaded to create an <code>Object</code> + * represening the content. For example, if the URL is pointing to a GIF + * file, this method might return an <code>Image</code> object. This method + * must be implemented by subclasses. This method uses the list of + * supplied classes as candidate types. If the data read doesn't match + * any of the supplied type, <code>null</code> is returned. + * + * @param urlc A <code>URLConnection</code> object to read data from. + * @param classes An array of types of objects that are candidate types + * for the data to be read. + * + * @return An object representing the data read, or <code>null</code> + * if the data does not match any of the candidate types. + * + * @exception IOException If an error occurs + * + * @since 1.3 + */ + public Object getContent(URLConnection urlc, Class[] classes) + throws IOException + { + Object obj = getContent(urlc); + + for (int i = 0; i < classes.length; i++) + { + if (classes[i].isInstance(obj)) + return obj; + } + + return null; + } +} // class ContentHandler |