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 embed; 045 046 private final boolean managedProperties; 047 048 /** 049 * Standard constructor. 050 * 051 * @param preferTag the prefer tag 052 */ 053 public LdpPreferTag(final PreferTag preferTag) { 054 super(preferTag); 055 056 final Optional<String> include = fromNullable(preferTag.getParams().get("include")); 057 final Optional<String> omit = fromNullable(preferTag.getParams().get("omit")); 058 final Optional<String> received = fromNullable(preferTag.getParams().get("received")); 059 060 final List<String> includes = asList(include.or(" ").split(" ")); 061 final List<String> omits = asList(omit.or(" ").split(" ")); 062 063 final boolean minimal = preferTag.getValue().equals("minimal") || received.or("").equals("minimal"); 064 065 final boolean preferMinimalContainer = includes.contains(LDP_NAMESPACE + "PreferMinimalContainer") || minimal; 066 067 membership = (!preferMinimalContainer && !omits.contains(LDP_NAMESPACE + "PreferMembership")) || 068 includes.contains(LDP_NAMESPACE + "PreferMembership"); 069 070 containment = (!preferMinimalContainer && !omits.contains(LDP_NAMESPACE + "PreferContainment")) || 071 includes.contains(LDP_NAMESPACE + "PreferContainment"); 072 073 references = includes.contains(INBOUND_REFERENCES.toString()); 074 075 embed = includes.contains(EMBED_CONTAINS.toString()); 076 077 managedProperties = includes.contains(SERVER_MANAGED.toString()) 078 || (!omits.contains(SERVER_MANAGED.toString()) && !minimal); 079 } 080 081 /** 082 * @return Whether this prefer tag demands membership triples. 083 */ 084 public boolean prefersMembership() { 085 return membership; 086 } 087 088 /** 089 * @return Whether this prefer tag demands containment triples. 090 */ 091 public boolean prefersContainment() { 092 return containment; 093 } 094 095 /** 096 * @return Whether this prefer tag demands references triples. 097 */ 098 public boolean prefersReferences() { 099 return references; 100 } 101 /** 102 * @return Whether this prefer tag demands embedded triples. 103 */ 104 public boolean prefersEmbed() { 105 return embed; 106 } 107 /** 108 * @return Whether this prefer tag demands server managed properties. 109 */ 110 public boolean prefersServerManaged() { 111 return managedProperties; 112 } 113}