chochos
1b07cf9a32
git-svn-id: https://j8583.svn.sourceforge.net/svnroot/j8583/j8583@52 db60a039-f72e-0410-b1d2-baa000846441
58 lines
1.9 KiB
Java
58 lines
1.9 KiB
Java
/*
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j8583 A Java implementation of the ISO8583 protocol
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Copyright (C) 2007 Enrique Zamudio Lopez
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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package com.solab.iso8583.impl;
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import com.solab.iso8583.TraceNumberGenerator;
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/** Simple implementation of a TraceNumberGenerator with an internal
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* number that is increased in memory but is not stored anywhere.
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*
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* @author Enrique Zamudio
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*/
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public class SimpleTraceGenerator implements TraceNumberGenerator {
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private int value = 0;
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/** Creates a new instance that will use the specified initial value. This means
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* the first nextTrace() call will return this number.
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* @param initialValue a number between 1 and 999999.
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* @throws IllegalArgumentException if the number is less than 1 or greater than 999999. */
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public SimpleTraceGenerator(int initialValue) {
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if (initialValue < 1 || initialValue > 999999) {
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throw new IllegalArgumentException("Initial value must be between 1 and 999999");
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}
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value = initialValue - 1;
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}
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public int getLastTrace() {
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return value;
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}
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/** Returns the next number in the sequence. This method is synchronized, because the counter
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* is incremented in memory only. */
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public synchronized int nextTrace() {
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value++;
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if (value > 999999) {
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value = 1;
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}
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return value;
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}
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}
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