libraries/fileconfig/src/main/java/org/apache/polygene/library/fileconfig/FileConfigurationDataWiper.java

/*
 *  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.polygene.library.fileconfig;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.apache.polygene.api.activation.ActivationEvent;
import org.apache.polygene.api.structure.Application;

public final class FileConfigurationDataWiper
{
    public static void registerApplicationPassivationDataWiper( FileConfiguration fileConfig, Application application )
    {
        final List<File> dataDirectories = new ArrayList<>();
        dataDirectories.add( fileConfig.configurationDirectory() );
        dataDirectories.add( fileConfig.cacheDirectory() );
        dataDirectories.add( fileConfig.dataDirectory() );
        dataDirectories.add( fileConfig.logDirectory() );
        dataDirectories.add( fileConfig.temporaryDirectory() );
        application.registerActivationEventListener(
            event ->
            {
                if( event.type() == ActivationEvent.EventType.PASSIVATED
                    && Application.class.isAssignableFrom( event.source().getClass() ) )
                {
                    for( File dataDir : dataDirectories )
                    {
                        if( !delete( dataDir ) )
                        {
                            System.err.println( "Unable to delete " + dataDir );
                        }
                    }
                }
            } );
    }

    private static boolean delete( File file )
    {
        if( !file.exists() )
        {
            return true;
        }
        if( file.isFile() )
        {
            return file.delete();
        }
        else
        {
            File[] files = file.listFiles();
            if( files != null )
            {
                for( File childFile : files )
                {
                    if( !delete( childFile ) )
                    {
                        return false;
                    }
                }
            }
            return file.delete();
        }
    }

    private FileConfigurationDataWiper()
    {
    }
}