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

/*
 * Copyright 2008 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.DecodeHintType;
import com.google.zxing.NotFoundException;
import com.google.zxing.Reader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.BitArray;
import com.google.zxing.oned.rss.RSS14Reader;
import com.google.zxing.oned.rss.expanded.RSSExpandedReader;

import java.util.Hashtable;
import java.util.Vector;

/**
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public final class MultiFormatOneDReader extends OneDReader {

  private final Vector readers;

  public MultiFormatOneDReader(Hashtable hints) {
    Vector possibleFormats = hints == null ? null :
        (Vector) hints.get(DecodeHintType.POSSIBLE_FORMATS);
    boolean useCode39CheckDigit = hints != null &&
        hints.get(DecodeHintType.ASSUME_CODE_39_CHECK_DIGIT) != null;
    readers = new Vector();
    if (possibleFormats != null) {
      if (possibleFormats.contains(BarcodeFormat.EAN_13) ||
          possibleFormats.contains(BarcodeFormat.UPC_A) ||
          possibleFormats.contains(BarcodeFormat.EAN_8) ||
          possibleFormats.contains(BarcodeFormat.UPC_E)) {
        readers.addElement(new MultiFormatUPCEANReader(hints));
      }
      if (possibleFormats.contains(BarcodeFormat.CODE_39)) {
        readers.addElement(new Code39Reader(useCode39CheckDigit));
      }
      if (possibleFormats.contains(BarcodeFormat.CODE_128)) {
        readers.addElement(new Code128Reader());
      }
      if (possibleFormats.contains(BarcodeFormat.ITF)) {
         readers.addElement(new ITFReader());
      }
      if (possibleFormats.contains(BarcodeFormat.RSS14)) {
         readers.addElement(new RSS14Reader());
      }
      if (possibleFormats.contains(BarcodeFormat.RSS_EXPANDED)){
        readers.addElement(new RSSExpandedReader());
      }
    }
    if (readers.isEmpty()) {
      readers.addElement(new MultiFormatUPCEANReader(hints));
      readers.addElement(new Code39Reader());
      readers.addElement(new Code128Reader());
      readers.addElement(new ITFReader());
      readers.addElement(new RSS14Reader());      
      readers.addElement(new RSSExpandedReader());      
    }
  }

  public Result decodeRow(int rowNumber, BitArray row, Hashtable hints) throws NotFoundException {
    int size = readers.size();
    for (int i = 0; i < size; i++) {
      OneDReader reader = (OneDReader) readers.elementAt(i);
      try {
        return reader.decodeRow(rowNumber, row, hints);
      } catch (ReaderException re) {
        // continue
      }
    }

    throw NotFoundException.getNotFoundInstance();
  }

  public void reset() {
    int size = readers.size();
    for (int i = 0; i < size; i++) {
      Reader reader = (Reader) readers.elementAt(i);
      reader.reset();
    }
  }

}