| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.openjpa.meta; |
| |
| import java.util.Comparator; |
| |
| import org.apache.openjpa.conf.OpenJPAConfiguration; |
| import org.apache.openjpa.enhance.PersistenceCapable; |
| import org.apache.openjpa.kernel.OpenJPAStateManager; |
| import org.apache.openjpa.util.ImplHelper; |
| |
| /** |
| * Order by a field in the related type in memory. |
| * |
| * @author Abe White |
| */ |
| class InMemoryRelatedFieldOrder |
| implements Order, Comparator { |
| |
| |
| private static final long serialVersionUID = 1L; |
| private final FieldMetaData _rel; |
| private final boolean _asc; |
| private final OpenJPAConfiguration _conf; |
| |
| public InMemoryRelatedFieldOrder(FieldMetaData rel, boolean asc, |
| OpenJPAConfiguration conf) { |
| _rel = rel; |
| _asc = asc; |
| _conf = conf; |
| } |
| |
| @Override |
| public String getName() { |
| return _rel.getName(); |
| } |
| |
| @Override |
| public boolean isAscending() { |
| return _asc; |
| } |
| |
| @Override |
| public Comparator getComparator() { |
| return this; |
| } |
| |
| @Override |
| public int compare(Object o1, Object o2) { |
| if (o1 == o2) |
| return 0; |
| if (!(ImplHelper.isManageable(o1)) |
| || !(ImplHelper.isManageable(o2))) |
| return 0; |
| |
| PersistenceCapable pc1 = ImplHelper.toPersistenceCapable(o1, _conf); |
| PersistenceCapable pc2 = ImplHelper.toPersistenceCapable(o2, _conf); |
| OpenJPAStateManager sm1 = (OpenJPAStateManager) pc1.pcGetStateManager(); |
| OpenJPAStateManager sm2 = (OpenJPAStateManager) pc2.pcGetStateManager(); |
| if (sm1 == null || sm2 == null) |
| return 0; |
| |
| Object v1 = sm1.fetchField(_rel.getIndex(), false); |
| Object v2 = sm2.fetchField(_rel.getIndex(), false); |
| if (v1 == v2) |
| return 0; |
| if (v1 == null) |
| return (_asc) ? -1 : 1; |
| if (v2 == null) |
| return (_asc) ? 1 : -1; |
| int cmp = ((Comparable) v1).compareTo(v2); |
| return (_asc) ? cmp : -cmp; |
| } |
| } |