src/org/hsqldb/rowio/RowOutputBinaryEncode.java

/* Copyright (c) 2001-2010, The HSQL Development Group
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 *
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 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
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 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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package org.hsqldb.rowio;

import org.hsqldb.Row;
import org.hsqldb.persist.Crypto;
import org.hsqldb.types.Type;

/**
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.9.0
 * @since 1.9.0
 */
public class RowOutputBinaryEncode extends RowOutputBinary {

    final Crypto crypto;

    public RowOutputBinaryEncode(Crypto crypto, int initialSize, int scale) {

        super(initialSize, scale);

        this.crypto = crypto;
    }

    public void writeData(Object[] data, Type[] types) {

        if (crypto == null) {
            super.writeData(data, types);
        } else {
            int start = count;

            writeInt(0);
            super.writeData(data, types);

            int origLength = count - start - INT_STORE_SIZE;
            int newLength = crypto.encode(buffer, start + INT_STORE_SIZE,
                                          origLength, buffer,
                                          start + INT_STORE_SIZE);

            writeIntData(newLength, start);

            count = start + INT_STORE_SIZE + newLength;
        }
    }

    /**
     *  Calculate the size of byte array required to store a row.
     *
     * @param  row - a database row
     * @return  size of byte array
     * @exception  HsqlException When data is inconsistent
     */
    public int getSize(Row row) {

        int size = super.getSize(row);

        if (crypto != null) {
            size = crypto.getEncodedSize(size - INT_STORE_SIZE)
                   + INT_STORE_SIZE * 2;
        }

        return size;
    }

    public RowOutputInterface duplicate() {
        return new RowOutputBinaryEncode(crypto, 128, this.scale);
    }
}