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ContentHandler.java
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111 lines (105 loc) · 3.67 KB
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/*
* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.net;
import java.io.IOException;
/**
* The abstract class {@code ContentHandler} is the superclass
* of all classes that read an {@code Object} from a
* {@code URLConnection}.
* <p>
* An application does not generally call the
* {@code getContent} method in this class directly. Instead, an
* application calls the {@code getContent} method in class
* {@code URL} or in {@code URLConnection}.
* The application's content handler factory (an instance of a class that
* implements the interface {@code ContentHandlerFactory} set
* up by a call to {@code setContentHandler}) is
* called with a {@code String} giving the MIME type of the
* object being received on the socket. The factory returns an
* instance of a subclass of {@code ContentHandler}, and its
* {@code getContent} method is called to create the object.
* <p>
* If no content handler could be found, URLConnection will
* look for a content handler in a user-defineable set of places.
* By default it looks in sun.net.www.content, but users can define a
* vertical-bar delimited set of class prefixes to search through in
* addition by defining the java.content.handler.pkgs property.
* The class name must be of the form:
* <pre>
* {package-prefix}.{major}.{minor}
* e.g.
* YoyoDyne.experimental.text.plain
* </pre>
* If the loading of the content handler class would be performed by
* a classloader that is outside of the delegation chain of the caller,
* the JVM will need the RuntimePermission "getClassLoader".
*
* @author James Gosling
* @see java.net.ContentHandler#getContent(java.net.URLConnection)
* @see java.net.ContentHandlerFactory
* @see java.net.URL#getContent()
* @see java.net.URLConnection
* @see java.net.URLConnection#getContent()
* @see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory)
* @since JDK1.0
*/
abstract public class ContentHandler {
/**
* Given a URL connect stream positioned at the beginning of the
* representation of an object, this method reads that stream and
* creates an object from it.
*
* @param urlc a URL connection.
* @return the object read by the {@code ContentHandler}.
* @exception IOException if an I/O error occurs while reading the object.
*/
abstract public Object getContent(URLConnection urlc) throws IOException;
/**
* Given a URL connect stream positioned at the beginning of the
* representation of an object, this method reads that stream and
* creates an object that matches one of the types specified.
*
* The default implementation of this method should call getContent()
* and screen the return type for a match of the suggested types.
*
* @param urlc a URL connection.
* @param classes an array of types requested
* @return the object read by the {@code ContentHandler} that is
* the first match of the suggested types.
* null if none of the requested are supported.
* @exception IOException if an I/O error occurs while reading the object.
* @since 1.3
*/
@SuppressWarnings("rawtypes")
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;
}
}