Issue 582

git-svn-id: https://zxing.googlecode.com/svn/trunk@1625 59b500cc-1b3d-0410-9834-0bbf25fbcc57

AUTHORS

@@ -6,6 +6,7 @@ Aitor Almeida (University of Deusto)
 Alasdair Mackintosh (Google)
 Alexander Martin (Haase & Martin GmbH)
 Andreas Pillath
+Andrew Walbran (Google)
 Andrey Sitnik
 Androida.hu / http://www.androida.hu/
 Antonio Manuel Benjumea (Servinform S.A.)

core/src/com/google/zxing/MultiFormatWriter.java

@@ -22,6 +22,7 @@ import com.google.zxing.oned.Code39Writer;
 import com.google.zxing.oned.EAN13Writer;
 import com.google.zxing.oned.EAN8Writer;
 import com.google.zxing.oned.ITFWriter;
+import com.google.zxing.oned.UPCAWriter;
 import com.google.zxing.qrcode.QRCodeWriter;
 
 import java.util.Hashtable;
@@ -48,6 +49,8 @@ public final class MultiFormatWriter implements Writer {
       writer = new EAN8Writer();
     } else if (format == BarcodeFormat.EAN_13) {
       writer = new EAN13Writer();
+    } else if (format == BarcodeFormat.UPC_A) {
+      writer = new UPCAWriter();
     } else if (format == BarcodeFormat.QR_CODE) {
       writer = new QRCodeWriter();
     } else if (format == BarcodeFormat.CODE_39) {

core/src/com/google/zxing/oned/UPCAWriter.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2010 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.zxing.oned;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.Writer;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+
+import java.util.Hashtable;
+
+/**
+ * This object renders a UPC-A code as a {@link BitMatrix}.
+ *
+ * @author qwandor@google.com (Andrew Walbran)
+ */
+public class UPCAWriter implements Writer {
+
+  private final EAN13Writer subWriter = new EAN13Writer();
+
+  public BitMatrix encode(String contents, BarcodeFormat format, int width, int height)
+      throws WriterException {
+    return encode(contents, format, width, height, null);
+  }
+
+  public BitMatrix encode(String contents, BarcodeFormat format, int width, int height, Hashtable hints)
+      throws WriterException {
+    if (format != BarcodeFormat.UPC_A) {
+      throw new IllegalArgumentException("Can only encode UPC-A, but got " + format);
+    }
+    return subWriter.encode(preencode(contents), BarcodeFormat.EAN_13, width, height, hints);
+  }
+
+  /**
+   * Transform a UPC-A code into the equivalent EAN-13 code, and add a check digit if it is not
+   * already present.
+   */
+  private static String preencode(String contents) {
+    int length = contents.length();
+    if (length == 11) {
+      // No check digit present, calculate it and add it
+      int sum = 0;
+      for (int i = 0; i < 11; ++i) {
+        sum += (contents.charAt(i) - '0') * (i % 2 == 0 ? 3 : 1);
+      }
+      contents += (1000 - sum) % 10;
+    } else if (length != 12) {
+      throw new IllegalArgumentException(
+          "Requested contents should be 11 or 12 digits long, but got " + contents.length());
+    }
+    return '0' + contents;
+  }
+}

core/test/src/com/google/zxing/oned/UPCAWriterTestCase.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.zxing.oned;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * @author qwandor@google.com (Andrew Walbran)
+ */
+public final class UPCAWriterTestCase extends Assert {
+
+  @Test
+  public void testEncode() throws WriterException {
+    String testStr = "00010101000110110111011000100010110101111011110101010111001011101001001110110011011011001011100101000";
+    BitMatrix result = new UPCAWriter().encode("485963095124", BarcodeFormat.UPC_A, testStr.length(), 0);
+    for (int i = 0; i < testStr.length(); i++) {
+      assertEquals("Element " + i,  testStr.charAt(i) == '1', result.get(i, 0));
+    }
+  }
+
+  @Test
+  public void testAddChecksumAndEncode() throws WriterException {
+    String testStr = "00010100110010010011011110101000110110001010111101010100010010010001110100111001011001101101100101000";
+    BitMatrix result = new UPCAWriter().encode("12345678901", BarcodeFormat.UPC_A, testStr.length(), 0);
+    for (int i = 0; i < testStr.length(); i++) {
+      assertEquals("Element " + i,  testStr.charAt(i) == '1', result.get(i, 0));
+    }
+  }
+
+}