/* * Copyright (c) 2000 jPOS.org.  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 end-user documentation included with the redistribution, *    if any, must include the following acknowledgment: *    "This product includes software developed by the jPOS project  *    (http://www.jpos.org/)". Alternately, this acknowledgment may  *    appear in the software itself, if and wherever such third-party  *    acknowledgments normally appear. * * 4. The names "jPOS" and "jPOS.org" must not be used to endorse  *    or promote products derived from this software without prior  *    written permission. For written permission, please contact  *    license@jpos.org. * * 5. Products derived from this software may not be called "jPOS", *    nor may "jPOS" appear in their name, without prior written *    permission of the jPOS project. * * THIS SOFTWARE IS PROVIDED ``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 THE JPOS PROJECT OR ITS 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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the jPOS Project.  For more * information please see <http://www.jpos.org/>. */package org.jpos.iso;import java.io.EOFException;import java.io.IOException;import java.io.InputStream;import java.io.ObjectOutput;/** * base class for the various IF*.java Field Packagers * Implements "FlyWeight" pattern * * @author apr@cs.com.uy * @version $Id: ISOFieldPackager.java,v 1.11 2003/10/13 10:34:15 apr Exp $ * * @see IFA_AMOUNT * @see IFA_BINARY * @see IFA_BITMAP * @see IFA_FLLCHAR * @see IFA_FLLNUM * @see IFA_LLCHAR * @see IFA_LLLBINARY * @see IFA_LLLCHAR * @see IFA_LLLNUM * @see IFA_LLNUM * @see IFA_NUMERIC * @see IFB_AMOUNT * @see IFB_BINARY * @see IFB_BITMAP * @see IFB_LLBINARY * @see IFB_LLCHAR * @see IFB_LLHBINARY * @see IFB_LLHCHAR * @see IFB_LLHECHAR * @see IFB_LLHNUM * @see IFB_LLLBINARY * @see IFB_LLLCHAR * @see IFB_LLLNUM * @see IFB_LLNUM * @see IFB_NUMERIC * @see IF_CHAR * @see IF_ECHAR */public abstract class ISOFieldPackager {    private int len;    private String description;    protected boolean pad;    /**     * Default Constructor     */    public ISOFieldPackager()    {        this.len = -1;        this.description = null;    }    /**     * @param len - field Len     * @param description - details     */    public ISOFieldPackager(int len, String description) {        this.len = len;        this.description = description;    }    public String getDescription() {        return description;    }    public void setDescription(String description) {        this.description = description;    }    public int getLength() {        return len;    }    public void setLength(int len) {        this.len = len;    }    public void setPad(boolean pad) {        this.pad = pad;    }    public abstract int getMaxPackedLength();    public ISOComponent createComponent(int fieldNumber) {        return new ISOField (fieldNumber);    }    /**     * @param c - a component     * @return packed component     * @exception ISOException     */    public abstract byte[] pack (ISOComponent c) throws ISOException;    /**     * @param c - the Component to unpack     * @param b - binary image     * @param offset - starting offset within the binary image     * @return consumed bytes     * @exception ISOException     */    public abstract int unpack (ISOComponent c, byte[] b, int offset)        throws ISOException;    /**     * @param c  - the Component to unpack     * @param in - input stream     * @exception ISOException     */    public void unpack (ISOComponent c, InputStream in)         throws IOException, ISOException    {        unpack (c, readBytes (in, getMaxPackedLength ()), 0);    }    /**     * @param c   - the Component to unpack     * @param out - output stream     * @exception ISOException     * @exception IOException     */    public void pack (ISOComponent c, ObjectOutput out)         throws IOException, ISOException    {        out.write (pack (c));    }    protected byte[] readBytes (InputStream in, int l) throws IOException {        byte[] b = new byte [l];        int n = 0;        while (n < l) {            int count = in.read(b, n, l - n);            if (count < 0)                throw new EOFException();            n += count;        }        return b;    }}