EncryptedPreferences/src/main/java/ru/bvn13/encryptedpreferences/EncryptedPreferences.java

package ru.bvn13.encryptedpreferences;

import java.security.*;
import java.util.prefs.*;
import javax.crypto.*;
import javax.crypto.spec.*;


/**
 * Created by bvn13 on 22.06.2017.
 */
public class EncryptedPreferences extends ObfuscatedPreferences
{
    private EncryptionStuff stuff;

    protected EncryptedPreferences( AbstractPreferences parent, String name,
                                    AbstractPreferences target ) {
        super( parent, name, target );
    }

    private void setStuff( EncryptionStuff stuff ) {
        this.stuff = stuff;
    }

    private EncryptionStuff getStuff() {
        return stuff;
    }

    public String obfuscateString( String string ) {
        try {
            return getStuff().obfuscateString( string );
        } catch( GeneralSecurityException gse ) {
            gse.printStackTrace();
        }
        return null;
    }

    public String deObfuscateString( String string ) {
        try {
            return getStuff().deObfuscateString( string );
        } catch( GeneralSecurityException gse ) {
            gse.printStackTrace();
        }
        return null;
    }

    public WrappedPreferences wrapChild( WrappedPreferences parent,
                                         String name,
                                         AbstractPreferences child ) {
        EncryptedPreferences ep = new EncryptedPreferences( parent, name, child );
        ep.setStuff( stuff );
        return ep;
    }

    static public Preferences userNodeForPackage( Class clasz,
                                                  SecretKey secretKey ) {
        AbstractPreferences ap =
                (AbstractPreferences)Preferences.userNodeForPackage( clasz );
        EncryptedPreferences ep = new EncryptedPreferences( null, "", ap );
        try {
            ep.setStuff( new EncryptionStuff( secretKey ) );
            return ep;
        } catch( GeneralSecurityException gse ) {
            gse.printStackTrace();
        }
        return null;
    }

    static public Preferences systemNodeForPackage( Class clasz,
                                                    SecretKey secretKey ) {
        AbstractPreferences ap =
                (AbstractPreferences)Preferences.systemNodeForPackage( clasz );
        EncryptedPreferences ep = new EncryptedPreferences( null, "", ap );
        try {
            ep.setStuff( new EncryptionStuff( secretKey ) );
            return ep;
        } catch( GeneralSecurityException gse ) {
            gse.printStackTrace();
        }
        return null;
    }
}