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/*
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* Copyright 2014 Robin Stuart
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package uk.org.okapibarcode.backend;
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import static uk.org.okapibarcode.util.Arrays.positionOf;
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/**
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* <p>
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* Implements Codabar barcode symbology according to BS EN 798:1996.
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*
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* <p>
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* Also known as NW-7, Monarch, ABC Codabar, USD-4, Ames Code and Code 27. Codabar can encode any
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* length string starting and ending with the letters A-D and containing between these letters the
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* numbers 0-9, dash (-), dollar ($), colon (:), slash (/), full stop (.) or plus (+). No check
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* digit is generated.
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*
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* @author <a href="mailto:jakel2006@me.com">Robert Elliott</a>
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*/
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public class Codabar extends Symbol {
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private static final String[] CODABAR_TABLE = { "11111221", "11112211", "11121121", "22111111", "11211211", "21111211", "12111121", "12112111", "12211111", "21121111", "11122111", "11221111",
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"21112121", "21211121", "21212111", "11212121", "11221211", "12121121", "11121221", "11122211" };
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private static final char[] CHARACTER_SET = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '$', ':', '/', '.', '+', 'A', 'B', 'C', 'D' };
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/** Ratio of wide bar width to narrow bar width. */
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private double moduleWidthRatio = 2;
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/**
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* Sets the ratio of wide bar width to narrow bar width. Valid values are usually between
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* {@code 2} and {@code 3}. The default value is {@code 2}.
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*
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* @param moduleWidthRatio the ratio of wide bar width to narrow bar width
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*/
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public void setModuleWidthRatio(final double moduleWidthRatio) {
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this.moduleWidthRatio = moduleWidthRatio;
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}
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/**
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* Returns the ratio of wide bar width to narrow bar width.
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*
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* @return the ratio of wide bar width to narrow bar width
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*/
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public double getModuleWidthRatio() {
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return this.moduleWidthRatio;
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}
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/** {@inheritDoc} */
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@Override
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protected void encode() {
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if (!this.content.matches("[A-D]{1}[0-9:/\\$\\.\\+\u002D]+[A-D]{1}")) {
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throw new OkapiException("Invalid characters in input");
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}
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String horizontalSpacing = "";
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final int l = this.content.length();
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for (int i = 0; i < l; i++) {
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horizontalSpacing += CODABAR_TABLE[positionOf(this.content.charAt(i), CHARACTER_SET)];
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}
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this.readable = this.content;
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this.pattern = new String[] { horizontalSpacing };
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this.row_count = 1;
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this.row_height = new int[] { -1 };
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}
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/** {@inheritDoc} */
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@Override
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protected double getModuleWidth(final int originalWidth) {
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if (originalWidth == 1) {
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return 1;
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} else {
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return this.moduleWidthRatio;
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}
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}
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/** {@inheritDoc} */
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@Override
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protected int[] getCodewords() {
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return getPatternAsCodewords(8);
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}
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}
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