Java tutorial
/** * Copyright 2017 TerraMeta Software, Inc. * * Licensed 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.cloudgraph.store.service; import java.io.Serializable; import java.util.Comparator; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.plasma.sdo.AssociationPath; import org.plasma.sdo.PlasmaNode; import org.plasma.sdo.PlasmaType; import org.plasma.sdo.core.CoreDataObject; import commonj.sdo.DataObject; import commonj.sdo.Property; public abstract class CommitComparator implements Comparator<CoreDataObject>, Serializable { private static final long serialVersionUID = 1L; private static Log log = LogFactory.getFactory().getInstance(CommitComparator.class); protected boolean isSingularRelation(DataObject target, DataObject source) { return (((PlasmaType) target.getType()).isRelation((PlasmaType) source.getType(), AssociationPath.singular)); } protected boolean hasChildLink(DataObject target, DataObject source) { if (log.isDebugEnabled()) log.debug("comparing " + target.toString() + "/" + source.toString()); for (Property property : target.getType().getProperties()) { if (property.getType().isDataType()) continue; if (property.isMany()) continue; Object value = target.get(property); if (value == null) continue; if (log.isDebugEnabled()) log.debug("checking property " + target.getType().getName() + "." + property.getName()); if (isLinked(source, value)) { if (log.isDebugEnabled()) log.debug("found child data link " + target.getType().getName() + "." + property.getName() + "->" + source.getType().getName()); return true; } } return false; } protected boolean isLinked(DataObject other, Object value) { if (value instanceof List) { List<DataObject> list = (List<DataObject>) value; for (DataObject dataObject : list) { PlasmaNode dataNode = (PlasmaNode) dataObject; if (dataNode.getUUIDAsString().equals(((PlasmaNode) other).getUUIDAsString())) { return true; } } } else { DataObject dataObject = (DataObject) value; PlasmaNode dataNode = (PlasmaNode) dataObject; if (dataNode.getUUIDAsString().equals(((PlasmaNode) other).getUUIDAsString())) { return true; } } return false; } }