content: /*
   * Copyright 2012-2019 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.origin;
  
  import java.io.File;
  
  /**
   * Interface that uniquely represents the origin of an item. For example, an item loaded
   * from a {@link File} may have an origin made up of the file name along with line/column
   * numbers.
   * <p>
   * Implementations must provide sensible {@code hashCode()}, {@code equals(...)} and
   * {@code #toString()} implementations.
   *
   * @author Madhura Bhave
   * @author Phillip Webb
   * @since 2.0.0
   * @see OriginProvider
   */
  public interface Origin {
  
  	/**
  	 * Find the {@link Origin} that an object originated from. Checks if the source object
  	 * is an {@link OriginProvider} and also searches exception stacks.
  	 * @param source the source object or {@code null}
  	 * @return an optional {@link Origin}
  	 */
  	static Origin from(Object source) {
  		if (source instanceof Origin) {
  			return (Origin) source;
  		}
  		Origin origin = null;
  		if (source instanceof OriginProvider) {
  			origin = ((OriginProvider) source).getOrigin();
  		}
  		if (origin == null && source instanceof Throwable) {
  			return from(((Throwable) source).getCause());
  		}
  		return origin;
  	}
  
  }
  