| /** |
| * JDBM LICENSE v1.00 |
| * |
| * Redistribution and use of this software and associated documentation |
| * ("Software"), with or without modification, are permitted provided |
| * that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain copyright |
| * statements and notices. Redistributions must also contain a |
| * copy of this document. |
| * |
| * 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 name "JDBM" must not be used to endorse or promote |
| * products derived from this Software without prior written |
| * permission of Cees de Groot. For written permission, |
| * please contact cg@cdegroot.com. |
| * |
| * 4. Products derived from this Software may not be called "JDBM" |
| * nor may "JDBM" appear in their names without prior written |
| * permission of Cees de Groot. |
| * |
| * 5. Due credit should be given to the JDBM Project |
| * (http://jdbm.sourceforge.net/). |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE JDBM PROJECT AND CONTRIBUTORS |
| * ``AS IS'' AND ANY EXPRESSED 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 |
| * CEES DE GROOT OR ANY 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. |
| * |
| * Copyright 2000 (C) Cees de Groot. All Rights Reserved. |
| * Contributions are Copyright (C) 2000 by their associated contributors. |
| * |
| * $Id: RecordHeader.java,v 1.1 2000/05/06 00:00:31 boisvert Exp $ |
| */ |
| package jdbm.recman; |
| |
| |
| import org.apache.directory.server.i18n.I18n; |
| |
| |
| /** |
| * The data that comes at the start of a record of data. It stores both the |
| * current size and the available size for the record - the latter can be |
| * bigger than the former, which allows the record to grow without needing to |
| * be moved and which allows the system to put small records in larger free |
| * spots. |
| */ |
| class RecordHeader |
| { |
| // offsets |
| private static final short O_CURRENTSIZE = 0; // int currentSize |
| private static final short O_AVAILABLESIZE = Magic.SZ_INT; // int availableSize |
| static final int SIZE = O_AVAILABLESIZE + Magic.SZ_INT; |
| |
| // my block and the position within the block |
| private BlockIo block; |
| private short pos; |
| |
| |
| /** |
| * Constructs a record header from the indicated data starting at the |
| * indicated position. |
| */ |
| RecordHeader( BlockIo block, short pos ) |
| { |
| this.block = block; |
| this.pos = pos; |
| |
| if ( pos > ( RecordFile.BLOCK_SIZE - SIZE ) ) |
| { |
| throw new Error( I18n.err( I18n.ERR_562, block.getBlockId(), pos ) ); |
| } |
| } |
| |
| |
| /** Returns the current size */ |
| int getCurrentSize() |
| { |
| return block.readInt( pos + O_CURRENTSIZE ); |
| } |
| |
| |
| /** Sets the current size */ |
| void setCurrentSize( int value ) |
| { |
| block.writeInt( pos + O_CURRENTSIZE, value ); |
| } |
| |
| |
| /** Returns the available size */ |
| int getAvailableSize() |
| { |
| return block.readInt( pos + O_AVAILABLESIZE ); |
| } |
| |
| |
| /** Sets the available size */ |
| void setAvailableSize( int value ) |
| { |
| block.writeInt( pos + O_AVAILABLESIZE, value ); |
| } |
| |
| |
| // overrides java.lang.Object |
| public String toString() |
| { |
| return "RH( " + block.getBlockId() + " : " + pos |
| + ", avl = " + getAvailableSize() |
| + ", cur = " + getCurrentSize() |
| + " )"; |
| } |
| } |