Android Open Source - final_app Scan From Web Page Manager

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CC0 1.0 Universal Statement of Purpose The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent...

Java Source Code

/*
 * Copyright (C) 2012 ZXing authors// w w  w  .j ava2s  .co  m
 *
 * 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.client.android;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import android.net.Uri;

import com.google.zxing.Result;
import com.google.zxing.client.android.result.ResultHandler;

/**
 * Manages functionality related to responding to requests to scan from an HTTP link in a web page. See <a
 * href="http://code.google.com/p/zxing/wiki/ScanningFromWebPages">ScanningFromWebPages</a>.
 * 
 * @author Sean Owen
 */
final class ScanFromWebPageManager {

  private static final CharSequence CODE_PLACEHOLDER = "{CODE}";
  private static final CharSequence RAW_CODE_PLACEHOLDER = "{RAWCODE}";
  private static final CharSequence META_PLACEHOLDER = "{META}";
  private static final CharSequence FORMAT_PLACEHOLDER = "{FORMAT}";
  private static final CharSequence TYPE_PLACEHOLDER = "{TYPE}";

  private static final String RETURN_URL_PARAM = "ret";
  private static final String RAW_PARAM = "raw";

  private final String returnUrlTemplate;
  private final boolean returnRaw;

  ScanFromWebPageManager(Uri inputUri) {
    returnUrlTemplate = inputUri.getQueryParameter(RETURN_URL_PARAM);
    returnRaw = inputUri.getQueryParameter(RAW_PARAM) != null;
  }

  boolean isScanFromWebPage() {
    return returnUrlTemplate != null;
  }

  String buildReplyURL(Result rawResult, ResultHandler resultHandler) {
    String result = returnUrlTemplate;
    result = replace(CODE_PLACEHOLDER, returnRaw ? rawResult.getText() : resultHandler.getDisplayContents(), result);
    result = replace(RAW_CODE_PLACEHOLDER, rawResult.getText(), result);
    result = replace(FORMAT_PLACEHOLDER, rawResult.getBarcodeFormat().toString(), result);
    result = replace(TYPE_PLACEHOLDER, resultHandler.getType().toString(), result);
    result = replace(META_PLACEHOLDER, String.valueOf(rawResult.getResultMetadata()), result);
    return result;
  }

  private static String replace(CharSequence placeholder, CharSequence with, String pattern) {
    CharSequence escapedWith = with == null ? "" : with;
    try {
      escapedWith = URLEncoder.encode(escapedWith.toString(), "UTF-8");
    } catch (UnsupportedEncodingException e) {
      // can't happen; UTF-8 is always supported. Continue, I guess, without encoding
    }
    return pattern.replace(placeholder, escapedWith);
  }

}

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