package info.gamlor.db4oseries;

import static info.gamlor.db4oseries.Preconditions.checkArgumentNotNull;

/**
 * @author roman.stoffel@gamlor.info
 * @since 26.10.2009
 */
public class ComplexObject {
    private SimpleObject knowsAbout;
    private SimpleObject mightKnowsAlso;
    private int version;

    public ComplexObject(SimpleObject knowsAbout) {
        checkArgumentNotNull(knowsAbout, "knowsAbout");
        this.knowsAbout = knowsAbout;
        this.version = 1;
    }

    public void increaseVersion(){
        version++;
    }

    public int getVersion() {
        return version;
    }

    public SimpleObject getKnowsAbout() {
        return knowsAbout;
    }

    public void setKnowsAbout(SimpleObject knowsAbout) {
        checkArgumentNotNull(knowsAbout, "knowsAbout"); 
        this.knowsAbout = knowsAbout;
    }

    public SimpleObject getMightKnowsAlso() {
        return mightKnowsAlso;
    }

    public void setMightKnowsAlso(SimpleObject mightKnowsAlso) {
        this.mightKnowsAlso = mightKnowsAlso;
    }

    @Override
    public String toString() {
        return "ComplexObject{" +
                "knowsAbout=" + knowsAbout +
                ", mightKnowsAlso=" + mightKnowsAlso +
                ", version=" + version +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof ComplexObject)) return false;

        ComplexObject that = (ComplexObject) o;

        if (version != that.version) return false;
        if (knowsAbout != null ? !knowsAbout.equals(that.knowsAbout) : that.knowsAbout != null) return false;
        if (mightKnowsAlso != null ? !mightKnowsAlso.equals(that.mightKnowsAlso) : that.mightKnowsAlso != null)
            return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = knowsAbout != null ? knowsAbout.hashCode() : 0;
        result = 31 * result + version;
        return result;
    }
}