PrimitiveByteArray2dJsonDeserializer.java

/*
 * Copyright 2014 Nicolas Morel
 *
 * 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 com.github.nmorel.gwtjackson.client.deser.array.dd;

import java.util.ArrayList;
import java.util.List;

import com.github.nmorel.gwtjackson.client.JsonDeserializationContext;
import com.github.nmorel.gwtjackson.client.JsonDeserializer;
import com.github.nmorel.gwtjackson.client.JsonDeserializerParameters;
import com.github.nmorel.gwtjackson.client.deser.BaseNumberJsonDeserializer.ByteJsonDeserializer;
import com.github.nmorel.gwtjackson.client.stream.JsonReader;
import com.github.nmorel.gwtjackson.client.stream.JsonToken;
import com.github.nmorel.gwtjackson.client.utils.Base64Utils;

/**
 * Default {@link JsonDeserializer} implementation for 2D array of byte.
 *
 * @author Nicolas Morel
 * @version $Id: $
 */
public class PrimitiveByteArray2dJsonDeserializer extends AbstractArray2dJsonDeserializer<byte[][]> {

    private static final PrimitiveByteArray2dJsonDeserializer INSTANCE = new PrimitiveByteArray2dJsonDeserializer();

    /**
     * <p>getInstance</p>
     *
     * @return an instance of {@link PrimitiveByteArray2dJsonDeserializer}
     */
    public static PrimitiveByteArray2dJsonDeserializer getInstance() {
        return INSTANCE;
    }

    private PrimitiveByteArray2dJsonDeserializer() { }

    /** {@inheritDoc} */
    @Override
    public byte[][] doDeserialize( JsonReader reader, JsonDeserializationContext ctx, JsonDeserializerParameters params ) {

        byte[][] result;

        reader.beginArray();
        JsonToken token = reader.peek();

        if ( JsonToken.END_ARRAY == token ) {

            // empty array
            result = new byte[0][0];

        } else if ( JsonToken.STRING == token ) {

            // byte[] are encoded as String

            List<byte[]> list = new ArrayList<byte[]>();
            int size = 0;
            while ( JsonToken.END_ARRAY != token ) {
                byte[] decoded = Base64Utils.fromBase64( reader.nextString() );
                size = Math.max( size, decoded.length );
                list.add( decoded );
                token = reader.peek();
            }

            result = new byte[list.size()][size];
            int i = 0;
            for ( byte[] value : list ) {
                if ( null != value ) {
                    result[i] = value;
                }
                i++;
            }

        } else {

            List<List<Byte>> list = doDeserializeIntoList( reader, ctx, ByteJsonDeserializer.getInstance(), params, token );

            List<Byte> firstList = list.get( 0 );
            if ( firstList.isEmpty() ) {

                result = new byte[list.size()][0];

            } else {

                result = new byte[list.size()][firstList.size()];

                int i = 0;
                int j;
                for ( List<Byte> innerList : list ) {
                    j = 0;
                    for ( Byte value : innerList ) {
                        if ( null != value ) {
                            result[i][j] = value;
                        }
                        j++;
                    }
                    i++;
                }
            }

        }

        reader.endArray();
        return result;

    }
}