/*
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;
/** Conjunction of conditions.
*
* @author hmueller
*
*/
import java.util.Vector;
import org.dbwiki.data.database.DatabaseElementNode;
import org.dbwiki.data.time.TimeSequence;
public class Conjunction implements Condition {
/*
* Private Variables
*/
private Vector<Condition> _conditions;
/*
* Constructors
*/
public Conjunction() {
_conditions = new Vector<Condition>();
}
/*
* Public Methods
*/
public void add(Condition condition) {
_conditions.add(condition);
}
public boolean eval(DatabaseElementNode node) {
for (Condition condition : _conditions) {
if (!condition.eval(node)) {
return false;
}
}
return true;
}
public TimeSequence evalTimestamp(DatabaseElementNode node) {
TimeSequence timestamp = null;
for (Condition condition : _conditions) {
TimeSequence t = condition.evalTimestamp(node);
if (t != null) {
if (timestamp != null) {
timestamp = timestamp.intersect(t);
if (timestamp.isEmpty()) {
return null;
}
} else {
timestamp = t;
}
}
}
return timestamp;
}
public void listConditions(AttributeConditionListing listing) {
for (Condition condition : _conditions) {
condition.listConditions(listing);
}
}
}