Major refactoring of 1D barcode code. Moved into com.google.zxing.oned package. Misc...

[zxing.git] / core / src / com / google / zxing / oned / MultiFormatUPCEANReader.java

diff --git a/core/src/com/google/zxing/oned/MultiFormatUPCEANReader.java b/core/src/com/google/zxing/oned/MultiFormatUPCEANReader.java
new file mode 100644 (file)
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+++ b/core/src/com/google/zxing/oned/MultiFormatUPCEANReader.java
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+/*
+ * Copyright 2008 Google Inc.
+ *
+ * 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.ReaderException;
+import com.google.zxing.Result;
+import com.google.zxing.common.BitArray;
+
+/**
+ * <p>A reader that can read all available UPC/EAN formats. If a caller wants to try to
+ * read all such formats, it is most efficent to use this implementation rather than invoke
+ * individual readers.</p>
+ *
+ * @author srowen@google.com (Sean Owen)
+ */
+public final class MultiFormatUPCEANReader extends AbstractOneDReader {
+
+  /**
+   * Reader implementations to which this implementation delegates, in the order
+   * they will be attempted. Order is important.
+   */
+  private final UPCEANReader[] readers = new UPCEANReader[] {
+      new EAN13Reader(), new UPCAReader(), new EAN8Reader(), new UPCEReader()
+  };
+
+  public Result decodeRow(int rowNumber, BitArray row) throws ReaderException {
+    int[] startGuardPattern = AbstractUPCEANReader.findStartGuardPattern(row);
+    return decodeRow(rowNumber, row, startGuardPattern);
+  }
+
+  /**
+   *
+   * @param rowNumber
+   * @param row
+   * @param startGuardRange
+   * @return
+   * @throws ReaderException
+   */
+  public Result decodeRow(int rowNumber, BitArray row, int[] startGuardRange) throws ReaderException {
+    ReaderException saved = null;
+    for (int i = 0; i < readers.length; i++) {
+      try {
+        return readers[i].decodeRow(rowNumber, row, startGuardRange);
+      } catch (ReaderException re) {
+        saved = re;
+      }
+    }
+    throw saved;
+  }
+
+}
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