001/* 002 * (C) Copyright 2006-2011 Nuxeo SA (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 */ 019 020package org.nuxeo.ecm.core.storage.sql; 021 022import java.io.Serializable; 023import java.util.Arrays; 024 025/** 026 * A type of fragment corresponding to several rows with the same id. 027 */ 028public class CollectionFragment extends Fragment { 029 030 private static final long serialVersionUID = 1L; 031 032 /** 033 * Constructs a {@link CollectionFragment} from a {@link Row}. 034 * 035 * @param row the row 036 * @param state the initial state for the fragment 037 * @param context the persistence context to which the fragment is tied, or {@code null} 038 */ 039 public CollectionFragment(Row row, State state, PersistenceContext context) { 040 super(row, state, context); 041 } 042 043 /** 044 * Sets a collection value. 045 * 046 * @param value the value 047 */ 048 public void set(Serializable[] value) { 049 // unless invalidated (in which case don't try to refetch the value just 050 // to compare state), don't mark modified or dirty if there is no change 051 if (getState() != State.INVALIDATED_MODIFIED) { 052 // not invalidated, so no need to call accessed() 053 if (Arrays.equals(row.values, value)) { 054 return; 055 } 056 } 057 row.values = value.clone(); 058 markModified(); 059 } 060 061 /** 062 * Gets the collection value. 063 * 064 * @return the value 065 */ 066 public Serializable[] get() { 067 accessed(); 068 return row.values.clone(); 069 } 070 071 /** 072 * Checks if the array is dirty (values changed since last clear). 073 * 074 * @return {@code true} if the array changed 075 */ 076 public boolean isDirty() { 077 return !Arrays.equals(row.values, oldvalues); 078 } 079 080 @Override 081 protected State refetch() { 082 row.values = context.mapper.readCollectionRowArray(row); 083 clearDirty(); 084 return State.PRISTINE; 085 } 086 087 @Override 088 protected State refetchDeleted() { 089 row.values = context.model.getCollectionFragmentType(row.tableName).getEmptyArray(); 090 clearDirty(); 091 return State.PRISTINE; 092 } 093 094}