001/** 002 * Copyright 2015 DuraSpace, Inc. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.fcrepo.http.commons.domain.ldp; 017 018import static java.util.Arrays.asList; 019import static java.util.Optional.ofNullable; 020import static org.fcrepo.kernel.api.RdfLexicon.EMBED_CONTAINS; 021import static org.fcrepo.kernel.api.RdfLexicon.INBOUND_REFERENCES; 022import static org.fcrepo.kernel.api.RdfLexicon.LDP_NAMESPACE; 023import static org.fcrepo.kernel.api.RdfLexicon.SERVER_MANAGED; 024 025import java.util.List; 026import java.util.Optional; 027 028import org.fcrepo.http.commons.domain.PreferTag; 029 030/** 031 * A subclass of {@link PreferTag} that contemplates the possible preferences for Linked Data Platform requests. 032 * 033 * @author ajs6f 034 */ 035public class LdpPreferTag extends PreferTag { 036 037 private final boolean membership; 038 039 private final boolean containment; 040 041 private final boolean references; 042 043 private final boolean embed; 044 045 private final boolean managedProperties; 046 047 /** 048 * Standard constructor. 049 * 050 * @param preferTag the prefer tag 051 */ 052 public LdpPreferTag(final PreferTag preferTag) { 053 super(preferTag); 054 055 final Optional<String> include = ofNullable(preferTag.getParams().get("include")); 056 final Optional<String> omit = ofNullable(preferTag.getParams().get("omit")); 057 final Optional<String> received = ofNullable(preferTag.getParams().get("received")); 058 059 final List<String> includes = asList(include.orElse(" ").split(" ")); 060 final List<String> omits = asList(omit.orElse(" ").split(" ")); 061 062 final boolean minimal = preferTag.getValue().equals("minimal") || received.orElse("").equals("minimal"); 063 064 final boolean preferMinimalContainer = includes.contains(LDP_NAMESPACE + "PreferMinimalContainer") || minimal; 065 066 membership = (!preferMinimalContainer && !omits.contains(LDP_NAMESPACE + "PreferMembership")) || 067 includes.contains(LDP_NAMESPACE + "PreferMembership"); 068 069 containment = (!preferMinimalContainer && !omits.contains(LDP_NAMESPACE + "PreferContainment")) || 070 includes.contains(LDP_NAMESPACE + "PreferContainment"); 071 072 references = includes.contains(INBOUND_REFERENCES.toString()); 073 074 embed = includes.contains(EMBED_CONTAINS.toString()); 075 076 managedProperties = includes.contains(SERVER_MANAGED.toString()) 077 || (!omits.contains(SERVER_MANAGED.toString()) && !minimal); 078 } 079 080 /** 081 * @return Whether this prefer tag demands membership triples. 082 */ 083 public boolean prefersMembership() { 084 return membership; 085 } 086 087 /** 088 * @return Whether this prefer tag demands containment triples. 089 */ 090 public boolean prefersContainment() { 091 return containment; 092 } 093 094 /** 095 * @return Whether this prefer tag demands references triples. 096 */ 097 public boolean prefersReferences() { 098 return references; 099 } 100 /** 101 * @return Whether this prefer tag demands embedded triples. 102 */ 103 public boolean prefersEmbed() { 104 return embed; 105 } 106 /** 107 * @return Whether this prefer tag demands server managed properties. 108 */ 109 public boolean prefersServerManaged() { 110 return managedProperties; 111 } 112}