001/* 002 * Licensed to DuraSpace under one or more contributor license agreements. 003 * See the NOTICE file distributed with this work for additional information 004 * regarding copyright ownership. 005 * 006 * DuraSpace licenses this file to you under the Apache License, 007 * Version 2.0 (the "License"); you may not use this file except in 008 * compliance with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.fcrepo.http.commons.responses; 019 020import static org.fcrepo.http.commons.domain.RDFMediaType.APPLICATION_LINK_FORMAT; 021 022import java.io.OutputStream; 023import java.io.PrintWriter; 024import java.lang.annotation.Annotation; 025import java.lang.reflect.Type; 026import java.nio.charset.StandardCharsets; 027 028import javax.ws.rs.Produces; 029import javax.ws.rs.WebApplicationException; 030import javax.ws.rs.core.MediaType; 031import javax.ws.rs.core.MultivaluedMap; 032import javax.ws.rs.ext.MessageBodyWriter; 033import javax.ws.rs.ext.Provider; 034 035/** 036 * Writer for application/link-format bodies. 037 * 038 * @author whikloj 039 * @since 2017-10-25 040 */ 041@Provider 042@Produces(APPLICATION_LINK_FORMAT) 043public class LinkFormatProvider implements MessageBodyWriter<LinkFormatStream> { 044 045 @Override 046 public boolean isWriteable(final Class<?> type, final Type genericType, final Annotation[] annotations, 047 final MediaType mediaType) { 048 return LinkFormatStream.class.isAssignableFrom(type); 049 } 050 051 @Override 052 public long getSize(final LinkFormatStream links, final Class<?> type, final Type genericType, 053 final Annotation[] annotations, final MediaType mediaType) { 054 return -1; 055 } 056 057 @Override 058 public void writeTo(final LinkFormatStream links, final Class<?> type, final Type genericType, 059 final Annotation[] annotations, final MediaType mediaType, final MultivaluedMap<String, Object> httpHeaders, 060 final OutputStream entityStream) 061 throws WebApplicationException { 062 063 final PrintWriter writer = new PrintWriter(entityStream, false, StandardCharsets.UTF_8); 064 links.getStream().forEach(l -> { 065 writer.println(l.toString() + ","); 066 }); 067 writer.close(); 068 } 069 070}