content: /*
   * Copyright (C) 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.decode;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.EnumSet;
  import java.util.List;
  import java.util.regex.Pattern;
  
  import android.content.Intent;
  import android.net.Uri;
  
  import com.google.zxing.BarcodeFormat;
  
  final class DecodeFormatManager {
  
  	private static final Pattern COMMA_PATTERN = Pattern.compile(",");
  
  	static final Collection<BarcodeFormat> PRODUCT_FORMATS;
  	static final Collection<BarcodeFormat> ONE_D_FORMATS;
  	static final Collection<BarcodeFormat> QR_CODE_FORMATS = EnumSet
  			.of(BarcodeFormat.QR_CODE);
  	static final Collection<BarcodeFormat> DATA_MATRIX_FORMATS = EnumSet
  			.of(BarcodeFormat.DATA_MATRIX);
  	static {
  		PRODUCT_FORMATS = EnumSet.of(BarcodeFormat.UPC_A, BarcodeFormat.UPC_E,
  				BarcodeFormat.EAN_13, BarcodeFormat.EAN_8,
  				BarcodeFormat.RSS_14, BarcodeFormat.RSS_EXPANDED);
  		ONE_D_FORMATS = EnumSet.of(BarcodeFormat.CODE_39,
  				BarcodeFormat.CODE_93, BarcodeFormat.CODE_128,
  				BarcodeFormat.ITF, BarcodeFormat.CODABAR);
  		ONE_D_FORMATS.addAll(PRODUCT_FORMATS);
  	}
  
  	private DecodeFormatManager() {
  	}
  
  	static Collection<BarcodeFormat> parseDecodeFormats(Intent intent) {
  		Iterable<String> scanFormats = null;
  		CharSequence scanFormatsString = intent
  				.getStringExtra(Intents.Scan.FORMATS);
  		if (scanFormatsString != null) {
  			scanFormats = Arrays.asList(COMMA_PATTERN.split(scanFormatsString));
  		}
  		return parseDecodeFormats(scanFormats,
  				intent.getStringExtra(Intents.Scan.MODE));
  	}
  
  	static Collection<BarcodeFormat> parseDecodeFormats(Uri inputUri) {
  		List<String> formats = inputUri
  				.getQueryParameters(Intents.Scan.FORMATS);
  		if (formats != null && formats.size() == 1 && formats.get(0) != null) {
  			formats = Arrays.asList(COMMA_PATTERN.split(formats.get(0)));
  		}
  		return parseDecodeFormats(formats,
  				inputUri.getQueryParameter(Intents.Scan.MODE));
  	}
  
  	private static Collection<BarcodeFormat> parseDecodeFormats(
  			Iterable<String> scanFormats, String decodeMode) {
  		if (scanFormats != null) {
  			Collection<BarcodeFormat> formats = EnumSet
  					.noneOf(BarcodeFormat.class);
  			try {
  				for (String format : scanFormats) {
  					formats.add(BarcodeFormat.valueOf(format));
  				}
  				return formats;
  			}
  			catch (IllegalArgumentException iae) {
  				// ignore it then
  			}
  		}
  		if (decodeMode != null) {
  			if (Intents.Scan.PRODUCT_MODE.equals(decodeMode)) {
  				return PRODUCT_FORMATS;
  			}
  			if (Intents.Scan.QR_CODE_MODE.equals(decodeMode)) {
  				return QR_CODE_FORMATS;
  			}
  			if (Intents.Scan.DATA_MATRIX_MODE.equals(decodeMode)) {
  				return DATA_MATRIX_FORMATS;
  			}
  			if (Intents.Scan.ONE_D_MODE.equals(decodeMode)) {
  				return ONE_D_FORMATS;
  			}
  		}
  		return null;
  	}
  
  }
  