/*
BEGIN LICENSE BLOCK
Copyright 2010-2011, Heiko Mueller, Sam Lindley, James Cheney and
University of Edinburgh
This file is part of Database Wiki.
Database Wiki is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Database Wiki is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Database Wiki. If not, see <http://www.gnu.org/licenses/>.
END LICENSE BLOCK
*/
package org.dbwiki.data.query.condition;
/** Implements the WAS MODIFIED predicate. Evaluates to true if a given
* node has a timestamp (or any of its children) that is different from
* it's parents timestamp. If an additional ProvenanceCondition is given
* the matching node has to satisfy the versions in the provenance condition,
* i.e., has to have an interval that starts at one of the versions in the
* provenance condition.
*
* @author hmueller
*
*/
import org.dbwiki.data.database.DatabaseAttributeNode;
import org.dbwiki.data.database.DatabaseElementNode;
import org.dbwiki.data.database.DatabaseGroupNode;
import org.dbwiki.data.query.xpath.XPath;
public class WasModifiedCondition extends ProvenancePathCondition {
/*
* Constructors
*/
public WasModifiedCondition(XPath targetPath, int quantifier, boolean negated, ProvenanceCondition provenanceCondition) {
super(targetPath, quantifier, negated, provenanceCondition);
}
public WasModifiedCondition(XPath targetPath, int quantifier, boolean negated) {
this(targetPath, quantifier, negated, null);
}
/*
* Public Methods
*/
public void eval(DatabaseElementNode node, EvaluationResult result) {
result.evaluationResult(this.wasModified(node));
}
public void evalTimestamp(DatabaseElementNode node, TimestampEvaluationResult evalResult) {
}
/*
* Private Methods
*/
private boolean wasModified(DatabaseElementNode node) {
if (node.hasTimestamp()) {
if ((!this.isRootTimestamp(node.getTimestamp())) && (this.matchesProvenanceCondition(node.getTimestamp()))) {
return true;
}
}
if (node.isAttribute()) {
DatabaseAttributeNode attribute = (DatabaseAttributeNode)node;
for (int iValue = 0; iValue < attribute.value().size(); iValue++) {
if (attribute.value().get(iValue).hasTimestamp()) {
if (this.matchesProvenanceCondition(attribute.value().get(iValue).getTimestamp())) {
return true;
}
}
}
return false;
} else {
DatabaseGroupNode group = (DatabaseGroupNode)node;
for (int iChild = 0; iChild < group.children().size(); iChild++) {
if (this.wasModified(group.children().get(iChild))) {
return true;
}
}
return false;
}
}
}