hamr.core.general.counter.SetSumCounter.java Source code

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Here is the source code for hamr.core.general.counter.SetSumCounter.java

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/*
  Copyright (c) 2015, Yiju Wei. 
    
  HAMR is a Frame let you use annotations to describe and execute a MapReduce process.
    
  This program 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; version 2
  of the License.
    
  This program 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 this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA
    
 */
package hamr.core.general.counter;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.apache.hadoop.mapreduce.Reducer.Context;

import hamr.core.general.annotations.ReduceField;
import hamr.core.general.annotations.TargetField;
import hamr.core.general.bean.AnnotedBean;

public class SetSumCounter extends Counter {
    private Map<String, Set<Object>> countings;
    static Map<Field, ReduceField> countFields;
    static Map<Field, TargetField> targetFields;

    @SuppressWarnings("rawtypes")
    public SetSumCounter(Context context) {
        super(context);
        countings = new HashMap<String, Set<Object>>();
    }

    @Override
    public void count(AnnotedBean ab) {

        if (countFields == null) {
            countFields = getCountFields(ab);
        }
        Set<Field> keys = countFields.keySet();
        for (Field f : keys) {
            if (!countings.containsKey(f.getName())) {
                countings.put(f.getName(), new HashSet<Object>());
            }
            try {
                countings.get(f.getName()).add(f.get(ab));
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }

    public boolean end(AnnotedBean ret) {
        if (ret == null) {
            return false;
        }
        if (targetFields == null) {
            targetFields = getTargetFields(ret);
        }
        Set<Field> fields = targetFields.keySet();
        for (Field f : fields) {
            String fromField = f.getAnnotation(TargetField.class).fromField();
            Integer num = countings.get(fromField).size();
            try {
                f.set(ret, num);
            } catch (IllegalArgumentException | IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        return true;
    }

}