DecodeThread.java

/*
 * Copyright (C) 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 cn.mutils.app.zxing.decode;

import android.os.Handler;
import android.os.Looper;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;

import java.util.Hashtable;
import java.util.Vector;
import java.util.concurrent.CountDownLatch;

import cn.mutils.app.zxing.CaptureView;

/**
 * This thread does all the heavy lifting of decoding the images.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
final class DecodeThread extends Thread {
    public static final String BARCODE_BITMAP = "barcode_bitmap";

    private final CaptureView mView;
    private final Hashtable<DecodeHintType, Object> mHints;
    private Handler mHandler;
    private final CountDownLatch mHandlerInitLatch;

    DecodeThread(CaptureView view, String characterSet) {

        this.mView = view;
        mHandlerInitLatch = new CountDownLatch(1);

        mHints = new Hashtable<DecodeHintType, Object>(3);

        Vector<BarcodeFormat> decodeFormats = new Vector<BarcodeFormat>();
        decodeFormats.add(BarcodeFormat.QR_CODE);
        decodeFormats.add(BarcodeFormat.CODE_128);
        decodeFormats.add(BarcodeFormat.CODE_93);
        decodeFormats.add(BarcodeFormat.CODE_39);
        decodeFormats.add(BarcodeFormat.UPC_A);
        decodeFormats.add(BarcodeFormat.UPC_E);
        decodeFormats.add(BarcodeFormat.EAN_13);
        decodeFormats.add(BarcodeFormat.EAN_8);
        decodeFormats.add(BarcodeFormat.ITF);
        decodeFormats.add(BarcodeFormat.DATA_MATRIX);

        mHints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);

        if (characterSet != null) {
            mHints.put(DecodeHintType.CHARACTER_SET, characterSet);
        }
    }

    Handler getHandler() {
        try {
            mHandlerInitLatch.await();
        } catch (InterruptedException ie) {
            // continue?
        }
        return mHandler;
    }

    @Override
    public void run() {
        Looper.prepare();
        mHandler = new DecodeHandler(mView, mHints);
        mHandlerInitLatch.countDown();
        Looper.loop();
    }

}