br.ufpe.cin.emergo.instrument.bitrep.BitVectorFeatureRep.java Source code

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Here is the source code for br.ufpe.cin.emergo.instrument.bitrep.BitVectorFeatureRep.java

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/*
 * This is a prototype implementation of the concept of Feature-Sen
 * sitive Dataflow Analysis. More details in the AOSD'12 paper:
 * Dataflow Analysis for Software Product Lines
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package br.ufpe.cin.emergo.instrument.bitrep;

import java.util.Collections;
import java.util.Set;

import org.apache.commons.collections.BidiMap;

import br.ufpe.cin.emergo.instrument.IConfigRep;
import br.ufpe.cin.emergo.instrument.IFeatureRep;
import cern.colt.bitvector.BitVector;

public class BitVectorFeatureRep implements IFeatureRep, Cloneable {
    private Set<String> features;
    private BidiMap atoms;
    private int id;
    private BitVector bits;

    public BitVectorFeatureRep(Set<String> features, BidiMap originalFeatureIds) {
        this.features = features;
        int accumulator = 0;
        for (String element : this.features) {
            Integer featId = (Integer) originalFeatureIds.get(element);
            if (featId != null) {
                accumulator += featId;
            }
        }
        this.id = accumulator;
        this.atoms = originalFeatureIds;
    }

    private BitVectorFeatureRep(Set<String> features, BidiMap atoms, BitVector bits, int id) {
        this.features = features;
        this.atoms = atoms;
        this.id = id;
        this.bits = (BitVector) bits.clone();
    }

    @Override
    public IFeatureRep clone() {
        return new BitVectorFeatureRep(this.features, this.atoms, this.bits, this.id);
    }

    public void computeBitVector() {
        int highestId = atoms.isEmpty() ? 1 : ((Integer) Collections.max(this.atoms.values())) << 1;
        this.bits = new BitVector(highestId);
        for (int index = 0; index < highestId; index++) {
            if ((this.id & index) == index) {
                bits.set(index);
            }
        }
        return;
    }

    @Override
    public IFeatureRep addAll(IFeatureRep rep) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean belongsToConfiguration(IConfigRep config) {
        return config.belongsToConfiguration(this);
    }

    @Override
    public Set<String> getFeatures() {
        return features;
    }

    @Override
    public int size() {
        return features.size();
    }

    @Override
    public String toString() {
        return this.bits.toString();
    }

    public BitVector getBitVector() {
        return this.bits;
    }

    @Override
    public boolean equals(Object o) {
        if (o == null)
            return false;
        if (this == o)
            return true;
        if (getClass() != o.getClass())
            return false;
        BitVectorFeatureRep that = (BitVectorFeatureRep) o;
        return this.id == that.id && this.bits.equals(that.bits);
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 31 * hash + bits.hashCode();
        return 31 * hash + id;
    }

    public int getId() {
        return id;
    }
}