org.i3xx.step.uno.impl.CardCacheImpl.java Source code

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Here is the source code for org.i3xx.step.uno.impl.CardCacheImpl.java

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package org.i3xx.step.uno.impl;

/*
 * #%L
 * NordApp OfficeBase :: uno
 * %%
 * Copyright (C) 2014 - 2015 I.D.S. DialogSysteme GmbH
 * %%
 * 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.
 * #L%
 */

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;

import org.apache.commons.codec.binary.Base64;
import org.i3xx.step.uno.impl.util.GsonHashMapDeserializer;
import org.i3xx.step.uno.model.CardCache;
import org.i3xx.step.uno.model.StepCard;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class CardCacheImpl implements CardCache {

    List<byte[]> buffer;

    public CardCacheImpl() {
        buffer = new ArrayList<byte[]>();
    }

    public void addCard(StepCard card) {
        buffer.add(readCard(card));
    }

    public void addCards(List<StepCard> cards) {
        for (StepCard card : cards)
            addCard(card);
    }

    public int size() {
        return buffer.size();
    }

    public StepCard getCard(int index) {
        return writeCard(buffer.get(index));
    }

    public List<StepCard> getCards() {
        List<StepCard> list = new ArrayList<StepCard>();
        for (byte[] buf : buffer)
            list.add(writeCard(buf));

        return list;
    }

    /**/
    private byte[] readCard(StepCard card) {
        if (card == null)
            return null;

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutputStream out = new ObjectOutputStream(buffer);
            out.writeObject(card);
            out.close();

            return buffer.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**/
    private StepCard writeCard(byte[] buffer) {
        if (buffer == null)
            return null;

        try {
            ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(buffer));
            StepCard card = (StepCard) in.readObject();
            in.close();

            return card;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * Serializes the content to JSON
     * 
     * @return The JSON String
     */
    public String toJSON() {
        Gson gson = new Gson();
        StringBuffer buf = new StringBuffer();

        buf.append('{');

        buf.append(gson.toJson("buffer"));
        buf.append(':');
        buf.append('[');
        for (int i = 0; i < buffer.size(); i++) {
            if (i > 0)
                buf.append(',');

            String stmt = Base64.encodeBase64URLSafeString(buffer.get(i));
            buf.append(gson.toJson(stmt));
        }
        buf.append(']');

        buf.append('}');

        return buf.toString();
    }

    /**
     * Deserializes the content from JSON
     * 
     * @param json The JSON String
     */
    public void fromJSON(String json) {

        GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.registerTypeAdapter(LinkedHashMap.class, new GsonHashMapDeserializer());
        Gson gson = gsonBuilder.create();

        LinkedHashMap<?, ?> m = gson.fromJson(json, LinkedHashMap.class);

        List<?> ll = (List<?>) m.get("buffer");
        buffer.clear();
        for (int i = 0; i < ll.size(); i++) {
            String stmt = (String) ll.get(i);
            buffer.add(Base64.decodeBase64(stmt));
        }
    }
}