001/** 002 * Copyright 2014 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 */ 016 017package org.fcrepo.http.commons.domain.ldp; 018 019import static com.google.common.base.Optional.fromNullable; 020import static java.util.Arrays.asList; 021import static org.fcrepo.kernel.RdfLexicon.EMBED_CONTAINS; 022import static org.fcrepo.kernel.RdfLexicon.INBOUND_REFERENCES; 023import static org.fcrepo.kernel.RdfLexicon.LDP_NAMESPACE; 024import static org.fcrepo.kernel.RdfLexicon.SERVER_MANAGED; 025 026import java.util.List; 027 028import org.fcrepo.http.commons.domain.PreferTag; 029 030import com.google.common.base.Optional; 031 032/** 033 * A subclass of {@link PreferTag} that contemplates the possible preferences for Linked Data Platform requests. 034 * 035 * @author ajs6f 036 */ 037public class LdpPreferTag extends PreferTag { 038 039 private final boolean membership; 040 041 private final boolean containment; 042 043 private final boolean references; 044 045 private final boolean preferMinimalContainer; 046 047 private final boolean embed; 048 049 private final boolean managedProperties; 050 051 /** 052 * Standard constructor. 053 * 054 * @param preferTag 055 */ 056 public LdpPreferTag(final PreferTag preferTag) { 057 super(preferTag); 058 059 final Optional<String> include = fromNullable(preferTag.getParams().get("include")); 060 final Optional<String> omit = fromNullable(preferTag.getParams().get("omit")); 061 final Optional<String> received = fromNullable(preferTag.getParams().get("received")); 062 063 final List<String> includes = asList(include.or(" ").split(" ")); 064 final List<String> omits = asList(omit.or(" ").split(" ")); 065 066 final boolean minimal = preferTag.getValue().equals("minimal") || received.or("").equals("minimal"); 067 068 preferMinimalContainer = includes.contains(LDP_NAMESPACE + "PreferMinimalContainer") || minimal; 069 070 membership = (!preferMinimalContainer && !omits.contains(LDP_NAMESPACE + "PreferMembership")) || 071 includes.contains(LDP_NAMESPACE + "PreferMembership"); 072 073 containment = (!preferMinimalContainer && !omits.contains(LDP_NAMESPACE + "PreferContainment")) || 074 includes.contains(LDP_NAMESPACE + "PreferContainment"); 075 076 references = includes.contains(INBOUND_REFERENCES.toString()); 077 078 embed = includes.contains(EMBED_CONTAINS.toString()); 079 080 managedProperties = includes.contains(SERVER_MANAGED.toString()) 081 || (!omits.contains(SERVER_MANAGED.toString()) && !minimal); 082 } 083 084 /** 085 * @return Whether this prefer tag demands membership triples. 086 */ 087 public boolean prefersMembership() { 088 return membership; 089 } 090 091 /** 092 * @return Whether this prefer tag demands containment triples. 093 */ 094 public boolean prefersContainment() { 095 return containment; 096 } 097 098 /** 099 * @return Whether this prefer tag demands references triples. 100 */ 101 public boolean prefersReferences() { 102 return references; 103 } 104 /** 105 * @return Whether this prefer tag demands embedded triples. 106 */ 107 public boolean prefersEmbed() { 108 return embed; 109 } 110 /** 111 * @return Whether this prefer tag demands server managed properties. 112 */ 113 public boolean prefersServerManaged() { 114 return managedProperties; 115 } 116}