/**
* Copyright (c) 2013, Institute of Information Systems (Sven Groppe and contributors of LUPOSDATE), University of Luebeck
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* - Neither the name of the University of Luebeck nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package lupos.optimizations.logical.rules;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import lupos.engine.operators.BasicOperator;
import lupos.engine.operators.Operator;
import lupos.engine.operators.OperatorIDTuple;
import lupos.engine.operators.singleinput.filter.Filter;
import lupos.misc.Tuple;
/**
* super class for all those rules, the left side of which is
*
* operator | filter
**/
public abstract class RuleFilter extends Rule {
public RuleFilter() {
super();
}
protected void init() {
// Define left side of rule
final Operator a = new Operator();
final Operator b = new Filter();
a.setSucceedingOperator(new OperatorIDTuple(b, -1));
b.setPrecedingOperator(a);
subGraphMap = new HashMap<BasicOperator, String>();
subGraphMap.put(a, "operator");
subGraphMap.put(b, "filter");
startNode = b;
}
protected abstract boolean checkPrecondition(Map<String, BasicOperator> mso);
protected abstract Tuple<Collection<BasicOperator>, Collection<BasicOperator>> transformOperatorGraph(
Map<String, BasicOperator> mso, BasicOperator rootOperator);
}