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/*
 * Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * 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
 *
 *      http://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.web.authentication.switchuser;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.SpringSecurityCoreVersion;

/**
 * Custom {@code GrantedAuthority} used by
 * {@link org.springframework.security.web.authentication.switchuser.SwitchUserFilter}
 * 
 * Stores the {@code Authentication} object of the original user to be used later when
 * 'exiting' from a user switch.
 *
 * @author Mark St.Godard
 *
 * @see org.springframework.security.web.authentication.switchuser.SwitchUserFilter
 */
public final class SwitchUserGrantedAuthority implements GrantedAuthority {

	private static final long serialVersionUID = SpringSecurityCoreVersion.SERIAL_VERSION_UID;

	// ~ Instance fields
	// ================================================================================================
	private final String role;
	private final Authentication source;

	// ~ Constructors
	// ===================================================================================================

	public SwitchUserGrantedAuthority(String role, Authentication source) {
		this.role = role;
		this.source = source;
	}

	// ~ Methods
	// ========================================================================================================

	/**
	 * Returns the original user associated with a successful user switch.
	 *
	 * @return The original Authentication object of the switched user.
	 */
	public Authentication getSource() {
		return source;
	}

	@Override
	public String getAuthority() {
		return role;
	}

	@Override
	public int hashCode() {
		return 31 ^ source.hashCode() ^ role.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}

		if (obj instanceof SwitchUserGrantedAuthority) {
			SwitchUserGrantedAuthority swa = (SwitchUserGrantedAuthority) obj;
			return this.role.equals(swa.role) && this.source.equals(swa.source);
		}

		return false;
	}

	@Override
	public String toString() {
		return "Switch User Authority [" + role + "," + source + "]";
	}
}