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package graphql.relay;

import graphql.PublicApi;

/**

* Represents pagination information in Relay about {@link graphql.relay.Edge edges} when used

* inside a {@link graphql.relay.Connection connection}

*

* See <a href="https://facebook.github.io/relay/graphql/connections.htm#sec-undefined.PageInfo">https://facebook.github.io/relay/graphql/connections.htm#sec-undefined.PageInfo</a>

*/

@PublicApi

public interface PageInfo {

/**

* @return cursor to the first edge, or null if this page is empty.

*/

ConnectionCursor getStartCursor();

/**

* @return cursor to the last edge, or null if this page is empty.

*/

ConnectionCursor getEndCursor();

/**

* @return true if and only if this page is not the first page. only meaningful when you gave the {@code last} argument.

*/

boolean isHasPreviousPage();

/**

* @return true if and only if this page is not the last page. only meaningful when you gave the {@code first} argument.

*/

boolean isHasNextPage();

}