joinedrow.java

开源的axion的数据库代码

/*
 * $Id: JoinedRow.java,v 1.4 2003/05/12 22:22:35 rwald Exp $
 * =======================================================================
 * Copyright (c) 2002 Axion Development Team.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 *
 * 2. 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.
 *
 * 3. The names "Tigris", "Axion", nor the names of its contributors may
 *    not be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. Products derived from this software may not be called "Axion", nor
 *    may "Tigris" or "Axion" appear in their names 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 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * =======================================================================
 */

package org.axiondb.engine.rowiterators;

import java.util.ArrayList;

import org.axiondb.Row;
import org.axiondb.engine.BaseRow;

/**
 * A {@link Row} composed of zero or more <code>Row</code>s,
 * joined together end-to-end.
 *
 * @version $Revision: 1.4 $ $Date: 2003/05/12 22:22:35 $
 * @author Rodney Waldhoff
 */
public class JoinedRow extends BaseRow {
    public JoinedRow() {
        _rows = new ArrayList(2);
    }

    public void addRow(Row row) {
        _size += row.size();
        _rows.add(row);
    }

    public Object get(int i) {
        int n = i;
        for(int j=0;j<_rows.size();j++) {
            Row row = (Row)(_rows.get(j));
            if(n < row.size()) {
                return row.get(n);
            } else {
               n -= row.size();
            }
        }
        throw new IndexOutOfBoundsException(i + " >= " + size());
    }

    public void set(int i, Object val) {
        int n = i;
        for(int j=0;j<_rows.size();j++) {
            Row row = (Row)(_rows.get(j));
            if(n < row.size()) {
                row.set(n,val);
                return;
            } else {
               n -= row.size();
            }
        }
        throw new IndexOutOfBoundsException(i + " >= " + size());
    }

    public int size() {
        return _size;
    }

    private ArrayList _rows = null;
    private int _size = 0;

}