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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 * Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
 *
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
 * and understandings on the user. The user is granted the right, without
 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
 * documentation for any purpose whatsoever, provided that this entire
 * notice appears in all copies of the software, derivative works and
 * supporting documentation.  Further, UCAR requests that the user credit
 * UCAR/Unidata in any publications that result from the use of this
 * software or in any product that includes this software. The names UCAR
 * and/or Unidata, however, may not be used in any advertising or publicity
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package ucar.nc2.util.net;

import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.auth.AuthScheme;
import org.apache.commons.httpclient.auth.CredentialsNotAvailableException;
import org.apache.commons.httpclient.auth.CredentialsProvider;

import java.io.IOException;
import java.io.Serializable;


//////////////////////////////////////////////////
// Provide a non-interactive CredentialsProvider to hold
// an arbitrary credentials object provided by the user.

public class HTTPCredsProvider implements CredentialsProvider, Credentials, Serializable
{
    Credentials creds = null;

    public HTTPCredsProvider(Credentials creds)
    {
	this.creds = creds;
    }

    // Credentials Provider Interface
    public Credentials
    getCredentials(AuthScheme authscheme, String host, int port, boolean isproxy)
	throws CredentialsNotAvailableException
    {
	return creds;
    }

    // Serializable Interface
    private void writeObject(java.io.ObjectOutputStream oos)
	throws IOException
    {
        boolean isser = (this.creds instanceof Serializable);
        oos.writeObject(isser);
        if(isser)
            oos.writeObject(this.creds);
        else {
            oos.writeObject(this.creds.getClass());
        }
    }

    private void readObject(java.io.ObjectInputStream ois)
	throws IOException, ClassNotFoundException
    {
        // serializing the credentials is a bit tricky
        // since it might not support the serializable interface.
        boolean isser = (Boolean)ois.readObject();
        Object o = ois.readObject();
        if(isser)
            this.creds = (Credentials)o;
        else {
            try {
                this.creds = (Credentials)((Class)o).newInstance();
            } catch (Exception e) {
                throw new ClassNotFoundException("HTTPCredsProvider: Cannot create Credentials instance",e);
            }
        }
    }
}