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/*
 * Copyright 2012-2018 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.boot.actuate.audit;

import java.time.Instant;
import java.time.OffsetDateTime;
import java.util.List;

import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * {@link Endpoint} to expose audit events.
 *
 * @author Andy Wilkinson
 * @since 2.0.0
 */
@Endpoint(id = "auditevents")
public class AuditEventsEndpoint {

	private final AuditEventRepository auditEventRepository;

	public AuditEventsEndpoint(AuditEventRepository auditEventRepository) {
		Assert.notNull(auditEventRepository, "AuditEventRepository must not be null");
		this.auditEventRepository = auditEventRepository;
	}

	@ReadOperation
	public AuditEventsDescriptor events(@Nullable String principal,
			@Nullable OffsetDateTime after, @Nullable String type) {
		List events = this.auditEventRepository.find(principal,
				getInstant(after), type);
		return new AuditEventsDescriptor(events);
	}

	private Instant getInstant(OffsetDateTime offsetDateTime) {
		return (offsetDateTime != null) ? offsetDateTime.toInstant() : null;
	}

	/**
	 * A description of an application's {@link AuditEvent audit events}. Primarily
	 * intended for serialization to JSON.
	 */
	public static final class AuditEventsDescriptor {

		private final List events;

		private AuditEventsDescriptor(List events) {
			this.events = events;
		}

		public List getEvents() {
			return this.events;
		}

	}

}




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