/*
 *   Licensed to the Apache Software Foundation (ASF) under one
 *   or more contributor license agreements.  See the NOTICE file
 *   distributed with this work for additional information
 *   regarding copyright ownership.  The ASF licenses this file
 *   to you under the Apache License, Version 2.0 (the
 *   "License"); you may not use this file except in compliance
 *   with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing,
 *   software distributed under the License is distributed on an
 *   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *   KIND, either express or implied.  See the License for the
 *   specific language governing permissions and limitations
 *   under the License.
 *
 */

package org.apache.directory.api.ldap.model.ldif.anonymizer;


import java.util.Map;
import java.util.Random;

import org.apache.directory.api.ldap.model.entry.Attribute;
import org.apache.directory.api.ldap.model.entry.DefaultAttribute;
import org.apache.directory.api.ldap.model.entry.StringValue;
import org.apache.directory.api.ldap.model.entry.Value;
import org.apache.directory.api.ldap.model.exception.LdapInvalidAttributeValueException;


/**
 * A default anonymizer for attributes that is an Integer
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class IntegerAnonymizer implements Anonymizer<String>
{
    /** Create a random generator */
    Random random = new Random( System.currentTimeMillis() );


    /**
     * Anonymize an attribute using pure random values (either chars of bytes, depending on the Attribute type)
     */
    @Override
    public Attribute anonymize( Map<Value<String>, Value<String>> valueMap, Attribute attribute )
    {
        Attribute result = new DefaultAttribute( attribute.getAttributeType() );
        random.setSeed( System.nanoTime() );

        for ( Value<?> value : attribute )
        {
            if ( value instanceof StringValue )
            {
                String strValue = value.getString();

                int length = strValue.length();

                // Same size
                char[] newValue = new char[length];

                for ( int i = 0; i < length; i++ )
                {
                    newValue[i] = ( char ) ( random.nextInt( '9' - '0' ) + '0' );
                }

                try
                {
                    result.add( new String( newValue ) );
                }
                catch ( LdapInvalidAttributeValueException e )
                {
                    // TODO : handle that
                }
            }
        }

        return result;
    }
}