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.exceptionhandlers; 017 018import static org.fcrepo.kernel.api.RdfLexicon.CONSTRAINED_BY; 019 020import javax.ws.rs.core.Link; 021import javax.ws.rs.core.UriInfo; 022import javax.ws.rs.ext.ExceptionMapper; 023 024import org.fcrepo.kernel.api.exception.ConstraintViolationException; 025 026/** 027 * Abstract class for constraint violation subclasses 028 * 029 * @author whikloj 030 * @since 2015-06-24 031 * @param <T> Throwable subclass of ConstraintViolationException 032 */ 033public abstract class ConstraintExceptionMapper<T extends ConstraintViolationException> implements ExceptionMapper<T> { 034 035 /** 036 * Where the RDF exception files sit. 037 */ 038 private static final String CONSTRAINT_DIR = "/static/constraints/"; 039 040 /** 041 * Creates a constrainedBy link header with the appropriate RDF URL for the exception. 042 * 043 * @param e ConstraintViolationException Exception which implements the buildContraintUri method. 044 * @param uriInfo UriInfo UriInfo from the ExceptionMapper. 045 * @return Link A http://www.w3.org/ns/ldp#constrainedBy link header 046 */ 047 public static Link buildConstraintLink(final ConstraintViolationException e, final UriInfo uriInfo) { 048 final String constraintURI = uriInfo == null ? "" : String.format("%s://%s%s%s.rdf", 049 uriInfo.getBaseUri().getScheme(), uriInfo.getBaseUri().getAuthority(), 050 CONSTRAINT_DIR, e.getClass().toString().substring(e.getClass().toString().lastIndexOf('.') + 1)); 051 return Link.fromUri(constraintURI).rel(CONSTRAINED_BY.getURI()).build(); 052 } 053 054}