001/* 002 * (C) Copyright 2019 Nuxeo (http://nuxeo.com/) and others. 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 * 016 * Contributors: 017 * Florent Guillaume 018 */ 019package org.nuxeo.ecm.core.blob; 020 021import org.nuxeo.ecm.core.api.NuxeoException; 022 023/** 024 * Represents computation of blob keys based on the document id. Only the main blob can be written using this strategy. 025 * 026 * @since 11.1 027 */ 028public class KeyStrategyDocId implements KeyStrategy { 029 030 private static final KeyStrategyDocId INSTANCE = new KeyStrategyDocId(); 031 032 // in these low-level APIs we deal with unprefixed xpaths, so not file:content 033 protected static final String MAIN_BLOB_XPATH = "content"; 034 035 public static KeyStrategyDocId instance() { 036 return INSTANCE; 037 } 038 039 @Override 040 public boolean useDeDuplication() { 041 return false; 042 } 043 044 @Override 045 public String getDigestFromKey(String key) { 046 return null; 047 } 048 049 @Override 050 public BlobWriteContext getBlobWriteContext(BlobContext blobContext) { 051 String xpath = blobContext.xpath; 052 if (!MAIN_BLOB_XPATH.equals(xpath)) { 053 throw new NuxeoException("Cannot store blob with xpath '" + xpath + "' in record blob provider"); 054 } 055 String key = getKey(blobContext); 056 return new BlobWriteContext(blobContext, null, () -> key, this); 057 } 058 059 protected String getKey(BlobContext blobContext) { 060 String docId = blobContext.docId; 061 if (docId == null) { 062 throw new NuxeoException("Missing docId for key strategy"); 063 } 064 return docId; 065 } 066 067 @Override 068 public boolean equals(Object obj) { 069 if (!(obj instanceof KeyStrategyDocId)) { 070 return false; 071 } 072 return true; 073 } 074 075 @Override 076 public int hashCode() { 077 return 0; 078 } 079 080}