it.scoppelletti.programmerpower.web.view.SerializableConverter.java Source code

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Here is the source code for it.scoppelletti.programmerpower.web.view.SerializableConverter.java

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/*
 * Copyright (C) 2011 Dario Scoppelletti, <http://www.scoppelletti.it/>.
 * 
 * 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 it.scoppelletti.programmerpower.web.view;

import java.io.*;
import java.util.*;
import com.opensymphony.xwork2.conversion.*;
import org.apache.commons.codec.binary.*;
import org.apache.struts2.util.*;
import it.scoppelletti.programmerpower.*;
import it.scoppelletti.programmerpower.io.*;
import it.scoppelletti.programmerpower.types.*;

/**
 * Convertitore degli oggetti serializzabili.
 * 
 * @since 1.0.0
 */
public final class SerializableConverter extends StrutsTypeConverter {

    /**
     * Costruttore.
     */
    public SerializableConverter() {
    }

    /**
     * Converte una stringa in oggetto.
     * 
     * @param  context Contesto.
     * @param  values  Vettore di stringhe da convertire. &Egrave; considerato
     *                 il solo primo elemento.
     * @param  toClass Tipo nel quale convertire il vettore di stringhe.
     * @return         Oggetto risultante.                                
     */
    @Override
    @SuppressWarnings("rawtypes")
    public Object convertFromString(Map context, String[] values, Class toClass) {
        Object obj;
        String s;
        byte[] data;
        InputStream buf = null;
        ObjectInputStream in = null;

        if (values == null || values.length == 0) {
            return null;
        }

        s = values[0];
        if (Strings.isNullOrEmpty(s)) {
            return null;
        }

        data = Base64.decodeBase64(s);
        try {
            buf = new ByteArrayInputStream(data);
            in = new ObjectInputStream(buf);
            buf = null;
            obj = in.readObject();
        } catch (Exception ex) {
            throw new TypeConversionException(ApplicationException.toString(ex), ex);
        } finally {
            if (buf != null) {
                IOUtils.close(buf);
                buf = null;
            }
            if (in != null) {
                IOUtils.close(in);
                in = null;
            }
        }

        return obj;
    }

    /**
     * Converte un oggetto in stringa.
     * 
     * @param  context Contesto.
     * @param  obj     Oggetto.
     * @return         Stringa risultante.
     */
    @Override
    @SuppressWarnings("rawtypes")
    public String convertToString(Map context, Object obj) {
        ByteArrayOutputStream buf = null;
        ObjectOutputStream out = null;
        Base64 encoder;

        try {
            buf = new ByteArrayOutputStream();
            out = new ObjectOutputStream(buf);

            out.writeObject(obj);
        } catch (IOException ex) {
            throw new TypeConversionException(ApplicationException.toString(ex), ex);
        } finally {
            if (out != null) {
                IOUtils.close(out);
                out = null;
            }
            if (buf != null) {
                IOUtils.close(buf);
            }
        }

        encoder = new Base64(0);
        return encoder.encodeToString(buf.toByteArray());
    }
}