/*
 * Copyright (C) 2014, Matthias Sohn <matthias.sohn@sap.com> and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
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;
	}
}