org.plasma.sdo.jdbc.service.CreatedCommitComparator Maven / Gradle / Ivy
/**
* 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.plasma.sdo.PlasmaChangeSummary;
import org.plasma.sdo.PlasmaType;
import org.plasma.sdo.core.CoreDataObject;
/**
* Comparator which imposes a commit ordering on created objects. Note: this
* comparator imposes orderings that are inconsistent with equals.
*/
public class CreatedCommitComparator extends CommitComparator {
private static final long serialVersionUID = 1L;
private static Log log = LogFactory.getFactory().getInstance(CreatedCommitComparator.class);
public int compare(CoreDataObject source, CoreDataObject target) {
PlasmaType targetType = (PlasmaType) target.getType();
PlasmaType sourceType = (PlasmaType) source.getType();
PlasmaChangeSummary changeSummary = (PlasmaChangeSummary) source.getDataGraph()
.getChangeSummary();
int targetDepth = changeSummary.getPathDepth(target);
int sourceDepth = changeSummary.getPathDepth(source);
if (targetType.getQualifiedName() != sourceType.getQualifiedName()) {
if (log.isDebugEnabled())
log.debug("comparing types: " + sourceType.toString() + " / " + targetType.toString());
if (isSingularRelation(source, target)) {
if (log.isDebugEnabled())
log.debug("(return 1) - singular relation from source: " + sourceType.toString()
+ " to target: " + targetType.toString());
return 1;
} else if (isSingularRelation(target, source)) {
if (log.isDebugEnabled())
log.debug("(return -1) - singular relation from target: " + targetType.toString()
+ " to source: " + sourceType.toString());
return -1;
} else {
if (log.isDebugEnabled())
log.debug("(return 0)");
return 0;
}
} else {
if (log.isDebugEnabled())
log.debug("comparing data objects : " + source.toString() + " / " + target.toString());
// give precedence to reference links, then to
// graph path depth
if (hasChildLink(source, target)) {
if (log.isDebugEnabled())
log.debug("singular link from : " + source.toString() + " to: " + target.toString());
return 1;
} else {
// For say a root object which is part of
// a tree, where the property e.g. 'parent'
// is null the above link check won't apply,
// Therefore rely on graph depth
if (sourceDepth < targetDepth) {
if (log.isDebugEnabled())
log.debug("depth: " + sourceDepth + " / " + targetDepth);
return -1;
} else
return 1;
}
}
}
}
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