/*
 * Copyright (C) 2014, Matthias Sohn <matthias.sohn@sap.com>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "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 THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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 */
package org.eclipse.jgit.transport;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.eclipse.jgit.errors.UnsupportedCredentialItem;

A credentials provider chaining multiple credentials providers
Since:
3.5/**
 * A credentials provider chaining multiple credentials providers
 *
 * @since 3.5
 */
public class ChainingCredentialsProvider extends CredentialsProvider {

	private List<CredentialsProvider> credentialProviders;

	
Create a new chaining credential provider. This provider tries to
retrieve credentials from the chained credential providers in the order
they are given here. If multiple providers support the requested items
and have non-null credentials the first of them will be used.
Params:
providers – 
           credential providers asked for credentials in the order given
           here/**
	 * Create a new chaining credential provider. This provider tries to
	 * retrieve credentials from the chained credential providers in the order
	 * they are given here. If multiple providers support the requested items
	 * and have non-null credentials the first of them will be used.
	 *
	 * @param providers
	 *            credential providers asked for credentials in the order given
	 *            here
	 */
	public ChainingCredentialsProvider(CredentialsProvider... providers) {
		this.credentialProviders = new ArrayList<>(
				Arrays.asList(providers));
	}

	
{@inheritDoc} /** {@inheritDoc} */
	@Override
	public boolean isInteractive() {
		for (CredentialsProvider p : credentialProviders)
			if (p.isInteractive())
				return true;
		return false;
	}

	
{@inheritDoc} /** {@inheritDoc} */
	@Override
	public boolean supports(CredentialItem... items) {
		for (CredentialsProvider p : credentialProviders)
			if (p.supports(items))
				return true;
		return false;
	}

	
{@inheritDoc}

Populates the credential items with the credentials provided by the first
credential provider in the list which populates them with non-null values
See Also:
CredentialsProvider.supports(CredentialItem[])/**
	 * {@inheritDoc}
	 * <p>
	 * Populates the credential items with the credentials provided by the first
	 * credential provider in the list which populates them with non-null values
	 *
	 * @see org.eclipse.jgit.transport.CredentialsProvider#supports(org.eclipse.jgit.transport.CredentialItem[])
	 */
	@Override
	public boolean get(URIish uri, CredentialItem... items)
			throws UnsupportedCredentialItem {
		for (CredentialsProvider p : credentialProviders) {
			if (p.supports(items)) {
				if (!p.get(uri, items)) {
					if (p.isInteractive()) {
						return false; // user cancelled the request
					}
					continue;
				}
				if (isAnyNull(items)) {
					continue;
				}
				return true;
			}
		}
		return false;
	}
}