/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.core.base.accumulators;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Serializable;
public class IntegerSumAccumulateFunction extends AbstractAccumulateFunction<IntegerSumAccumulateFunction.SumData> {
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { }
public void writeExternal(ObjectOutput out) throws IOException { }
protected static class SumData implements Externalizable {
public int total = 0;
public SumData() {}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
total = in.readInt();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(total);
}
}
public SumData createContext() {
return new SumData();
}
public void init(SumData data) {
data.total = 0;
}
public void accumulate(SumData data, Object value) {
if (value != null) {
data.total += ( (Integer) value );
}
}
public void reverse(SumData data, Object value) {
if (value != null) {
data.total -= ( (Integer) value );
}
}
public Object getResult(SumData data) {
return data.total;
}
public boolean supportsReverse() {
return true;
}
public Class<?> getResultType() {
return Integer.class;
}
}