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; 017 018import static org.fcrepo.http.commons.domain.PreferTag.emptyTag; 019 020import java.text.ParseException; 021import java.util.Set; 022import java.util.TreeSet; 023 024import org.glassfish.jersey.message.internal.HttpHeaderReader; 025 026/** 027 * JAX-RS HTTP parameter parser for the Prefer header 028 * 029 * @author cabeer 030 * @author ajs6f 031 * @author acoburn 032 */ 033public class SinglePrefer { 034 035 private final Set<PreferTag> preferTags = new TreeSet<>(); 036 037 /** 038 * Parse a Prefer: header 039 * 040 * @param header the header 041 * @throws ParseException if parse exception occurred 042 */ 043 public SinglePrefer(final String header) throws ParseException { 044 preferTags.addAll(HttpHeaderReader.readList(PreferTag::new, header)); 045 } 046 047 /** 048 * Does the Prefer: header have a return tag 049 * 050 * @return true if the header has a return tag 051 */ 052 public Boolean hasReturn() { 053 return preferTags().stream().map(PreferTag::getTag).anyMatch("return"::equals); 054 } 055 056 /** 057 * Does the Prefer: header have a return tag 058 * 059 * @return true if the header has a return tag 060 */ 061 public Boolean hasHandling() { 062 return preferTags().stream().map(PreferTag::getTag).anyMatch("handling"::equals); 063 } 064 065 /** 066 * Get the return tag, or a blank default, if none exists. 067 * 068 * @return return tag, or a blank default, if none exists 069 */ 070 public PreferTag getReturn() { 071 return preferTags().stream() 072 .filter(x -> x.getTag().equals("return")) 073 .findFirst().orElse(emptyTag()); 074 } 075 076 /** 077 * Get the return tag, or a blank default, if none exists. 078 * 079 * @return return tag, or a blank default, if none exists 080 */ 081 public PreferTag getHandling() { 082 return preferTags().stream() 083 .filter(x -> x.getTag().equals("handling")) 084 .findFirst().orElse(emptyTag()); 085 } 086 087 protected Set<PreferTag> preferTags() { 088 return preferTags; 089 } 090}