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

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Here is the source code for br.ufpe.cin.emergo.instrument.bitrep.BitConfigRep.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.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.apache.commons.collections.BidiMap;
import org.apache.commons.collections.bidimap.UnmodifiableBidiMap;
import org.apache.commons.lang3.builder.HashCodeBuilder;

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

public final class BitConfigRep implements IConfigRep {

    private final int id;
    // String->int
    private final UnmodifiableBidiMap atoms;

    private final int hashCode;

    public BitConfigRep(int identifier, UnmodifiableBidiMap atoms) {
        this.atoms = atoms;
        this.id = identifier;
        this.hashCode = new HashCodeBuilder(17, 31).append(id).toHashCode();
    }

    public BitConfigRep(int identifier, BidiMap atoms) {
        this.atoms = (UnmodifiableBidiMap) UnmodifiableBidiMap.decorate(atoms);
        id = identifier;
        this.hashCode = new HashCodeBuilder(17, 31).append(id).toHashCode();
    }

    public static boolean isValid(int identifier, BidiMap atoms, FeatureSetChecker checker) {
        if (checker == null)
            return true;
        Set<String> enabledFeatures = new HashSet<String>();
        Set<String> disabledFeatures = new HashSet<String>();
        Collection<Integer> values = atoms.values();
        for (Integer featureId : values) {
            String featureStr = (String) atoms.getKey(featureId);
            if ((featureId & identifier) == featureId)
                enabledFeatures.add(featureStr);
            else
                disabledFeatures.add(featureStr);
        }
        return checker.check(enabledFeatures, disabledFeatures);
    }

    public static SetBitConfigRep localConfigurations(int highestId, UnmodifiableBidiMap atoms,
            FeatureSetChecker checker) {
        Set<IConfigRep> localConfigs = new HashSet<IConfigRep>();
        for (int index = 0; index < highestId; index++) {
            if (isValid(index, atoms, checker)) {
                localConfigs.add(new BitConfigRep(index, atoms));
            }
        }
        return new SetBitConfigRep(localConfigs, atoms, highestId);
    }

    public static SetBitConfigRep localConfigurations(int highestId, UnmodifiableBidiMap atoms) {
        Set<IConfigRep> localConfigs = new HashSet<IConfigRep>();
        for (int index = 0; index < highestId; index++) {
            localConfigs.add(new BitConfigRep(index, atoms));
        }
        return new SetBitConfigRep(localConfigs, atoms, highestId);
    }

    public int getId() {
        return id;
    }

    @Override
    public boolean equals(Object o) {
        if (o == null)
            return false;
        if (this == o)
            return true;
        if (!(o instanceof BitConfigRep))
            return false;
        BitConfigRep that = (BitConfigRep) o;
        return this.id == that.id;
    }

    @Override
    public int hashCode() {
        return this.hashCode;
    }

    @Override
    public boolean belongsToConfiguration(IFeatureRep rep) {
        if (rep instanceof BitFeatureRep) {
            BitFeatureRep bitRep = (BitFeatureRep) rep;
            int repId = bitRep.getId();
            return ((repId & this.id) == repId);
        } else if (rep instanceof BitVectorFeatureRep) {
            BitVectorFeatureRep bitVectorFeatureRep = (BitVectorFeatureRep) rep;
            BitVector bitVector = bitVectorFeatureRep.getBitVector();
            return bitVector.get(this.id);
        }
        throw new IllegalArgumentException();
    }

    @Override
    public int size() {
        return Integer.bitCount(id);
    }

    @Override
    public String toString() {
        StringBuffer b = new StringBuffer();

        Collection<Integer> collection = atoms.values();

        for (Integer v : collection) {
            if (v.toString().contains(Integer.toString(id))) {
                b.append(atoms.getKey(v));
            }
        }

        b.append((b.length() == 0) ? "ROOT" : "");

        return b.toString();
    }

    public UnmodifiableBidiMap getAtoms() {
        return atoms;
    }

    @Override
    public IConfigRep union(IConfigRep rep) {
        if (rep instanceof BitConfigRep) {
            BitConfigRep bitRep = (BitConfigRep) rep;

            int size = 1;
            if (!atoms.values().isEmpty()) {
                size = Collections.max(((Collection<Integer>) atoms.values()));
            }

            return BitVectorConfigRep.union(this, bitRep, size, atoms);
        } else {
            throw new UnsupportedOperationException();
        }
    }

    @Override
    public IConfigRep intersection(IConfigRep rep) {
        if (rep instanceof BitVectorConfigRep) {
            return rep.intersection(this);
        } else if (rep instanceof BitConfigRep) {
            if (this.id == ((BitConfigRep) rep).id) {
                return this;
            } else {
                return empty();
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    private BitConfigRep empty() {
        return new BitConfigRep(0, atoms);
    }

    @Override
    public Iterator<IConfigRep> iterator() {
        throw new UnsupportedOperationException();
    }

}