001/* 002 * Licensed to DuraSpace under one or more contributor license agreements. 003 * See the NOTICE file distributed with this work for additional information 004 * regarding copyright ownership. 005 * 006 * DuraSpace licenses this file to you under the Apache License, 007 * Version 2.0 (the "License"); you may not use this file except in 008 * compliance with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.fcrepo.kernel.api.models; 019 020import org.fcrepo.kernel.api.Transaction; 021import org.fcrepo.kernel.api.identifiers.FedoraId; 022 023/** 024 * Utility class interface for helper methods. 025 * @author whikloj 026 * @since 6.0.0 027 */ 028public interface ResourceHelper { 029 030 /** 031 * Check if a resource exists. 032 * @param transaction The current transaction 033 * @param fedoraId The internal identifier 034 * @param includeDeleted Whether to check for deleted resources too. 035 * @return True if the identifier resolves to a resource. 036 */ 037 public boolean doesResourceExist(final Transaction transaction, final FedoraId fedoraId, 038 final boolean includeDeleted); 039 040 /** 041 * Is the resource a "ghost node". Ghost nodes are defined as a resource that does not exist, but whose URI is part 042 * of the URI of another resource? For example: 043 * 044 * http://localhost/rest/a/b - does exist 045 * http://localhost/rest/a - does not exist and is therefore a ghost node. 046 * 047 * @param transaction The transaction 048 * @param resourceId Identifier of the resource 049 * @return Whether the resource does not exist, but has 050 */ 051 public boolean isGhostNode(final Transaction transaction, final FedoraId resourceId); 052}