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