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Module for providing OAuth2 support to Spring Security

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/*
 * Copyright 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.security.oauth2.provider;

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

import org.springframework.security.oauth2.common.OAuth2AccessToken;

/**
 * @author Dave Syer
 * 
 */
public class CompositeTokenGranter implements TokenGranter {

	private final List tokenGranters;

	public CompositeTokenGranter(List tokenGranters) {
		this.tokenGranters = new ArrayList(tokenGranters);
	}
	
	public OAuth2AccessToken grant(String grantType, TokenRequest tokenRequest) {
		for (TokenGranter granter : tokenGranters) {
			OAuth2AccessToken grant = granter.grant(grantType, tokenRequest);
			if (grant!=null) {
				return grant;
			}
		}
		return null;
	}
	
	public void addTokenGranter(TokenGranter tokenGranter) {
		if (tokenGranter == null) {
			throw new IllegalArgumentException("Token granter is null");
		}
		tokenGranters.add(tokenGranter);
	}

}