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The Plasma JDBC Module
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/**
 *         PlasmaSDO™ License
 * 
 * This is a community release of PlasmaSDO™, a dual-license 
 * Service Data Object (SDO) 2.1 implementation. 
 * This particular copy of the software is released under the 
 * version 2 of the GNU General Public License. PlasmaSDO™ was developed by 
 * TerraMeta Software, Inc.
 * 
 * Copyright (c) 2013, TerraMeta Software, Inc. All rights reserved.
 * 
 * General License information can be found below.
 * 
 * This distribution may include materials developed by third
 * parties. For license and attribution notices for these
 * materials, please refer to the documentation that accompanies
 * this distribution (see the "Licenses for Third-Party Components"
 * appendix) or view the online documentation at 
 * .
 *  
 */
package org.plasma.sdo.jdbc.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, 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 list = (List) 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;
  }
}