BitcoinUIModel.java

package wallettemplate.utils;

import org.bitcoinj.core.*;

import javafx.application.Platform;
import javafx.beans.property.ReadOnlyDoubleProperty;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;

import java.util.Date;

/**
 * A class that exposes relevant bitcoin stuff as JavaFX bindable properties.
 */
public class BitcoinUIModel {
	private final long CHUNK_SIZE = 1000000;
    private SimpleObjectProperty<Address> address = new SimpleObjectProperty<>();
    private SimpleObjectProperty<Coin> balance = new SimpleObjectProperty<>(Coin.ZERO);
    private SimpleDoubleProperty syncProgress = new SimpleDoubleProperty(-1);
    private ProgressBarUpdater syncProgressUpdater = new ProgressBarUpdater();
    private ObservableList<TransactionOutput> outputs = FXCollections.observableArrayList();
    
    public BitcoinUIModel() {
    }

    public BitcoinUIModel(Wallet wallet) {
        setWallet(wallet);
    }

    public void setWallet(Wallet wallet) {
        wallet.addEventListener(new AbstractWalletEventListener() {
            @Override
            public void onWalletChanged(Wallet wallet) {
                super.onWalletChanged(wallet);
                update(wallet);
            }
        }, Platform::runLater);
        update(wallet);
    }

    private void update(Wallet wallet) {
        balance.set(wallet.getBalance());
        address.set(wallet.currentReceiveAddress());
        outputs.setAll(wallet.calculateAllSpendCandidates(true));
        for (Object obj : outputs.toArray()) {
        	TransactionOutput output = (TransactionOutput)obj;
        	if (output.getValue().getValue() < CHUNK_SIZE) outputs.remove(obj);
        }
        
    }

    private class ProgressBarUpdater extends DownloadProgressTracker {
        @Override
        protected void progress(double pct, int blocksLeft, Date date) {
            super.progress(pct, blocksLeft, date);
            Platform.runLater(() -> syncProgress.set(pct / 100.0));
        }

        @Override
        protected void doneDownload() {
            super.doneDownload();
            Platform.runLater(() -> syncProgress.set(1.0));
        }
    }

    public DownloadProgressTracker getDownloadProgressTracker() { return syncProgressUpdater; }

    public ReadOnlyDoubleProperty syncProgressProperty() { return syncProgress; }

    public ReadOnlyObjectProperty<Address> addressProperty() {
        return address;
    }

    public ReadOnlyObjectProperty<Coin> balanceProperty() {
        return balance;
    }
    
    public ObservableList<TransactionOutput> getOutputs() {
    	return outputs;
    }
    
}