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Uberfire NIO.2 :: Model
There is a newer version: 7.74.1.Final
/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.uberfire.java.nio.base;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.XStreamException;

/**
 *
 */
public class Properties extends HashMap {

    public Properties() {
    }

    public Properties( final Map original ) {
        for ( Map.Entry e : original.entrySet() ) {
            if ( e.getValue() != null ) {
                put( e.getKey(),
                     e.getValue() );
            }
        }
    }

    public Object put( final String key,
                       final Object value ) {
        if ( value == null ) {
            return remove( key );
        }
        return super.put( key, value );
    }

    public void store( final OutputStream out ) {
        store( out, true );
    }

    public void store( final OutputStream out,
                       boolean closeOnFinish ) {
        final XStream xstream = new XStream();
        xstream.toXML( this, out );
        if ( closeOnFinish ) {
            try {
                out.close();
            } catch ( IOException e ) {
            }
        }
    }

    public void load( final InputStream in ) {
        load( in, true );
    }

    public void load( final InputStream in,
                      boolean closeOnFinish ) {
        final XStream xstream = new XStream();
        final Properties temp = new Properties();
        try {
            xstream.fromXML( in, temp );
        } catch ( final XStreamException ex ) {
            if ( ex.getCause() != null ) {
                if ( !ex.getCause().getMessage().equals( "input contained no data" ) ) {
                    throw ex;
                }
            }
        }

        for ( final Map.Entry entry : temp.entrySet() ) {
            if ( entry.getValue() != null ) {
                put( entry.getKey(), entry.getValue() );
            }
        }
        temp.clear();
        if ( closeOnFinish ) {
            try {
                in.close();
            } catch ( IOException e ) {
            }
        }
    }

}