Android Open Source - bgrates Exchange Rate

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License

The source code is released under:

MIT License

Java Source Code

/*
 * The MIT License//from w w  w. j  a  v  a  2 s  .  c o  m
 * 
 * Copyright (c) 2010 Petar Petrov
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package net.vexelon.bgrates;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Hashtable;
import java.util.List;
import net.vexelon.bgrates.CurrencyInfo.Tendency;

import android.os.Parcel;
import android.os.Parcelable;

public class ExchangeRate implements Parcelable {
  
  private final static int DEFAULT_SIZE = 30;
  
  private List<CurrencyInfo> _currencies = null;
  private ArrayList<String> _currencyCodesCache = null;
  private HeaderInfo _header = null;
  private static final Hashtable<String, Integer> _flagIds = new Hashtable<String, Integer>(10);
  
  static {
    _flagIds.put("au", R.drawable.au);
    _flagIds.put("bg", R.drawable.bg);
    _flagIds.put("br", R.drawable.br);
    _flagIds.put("ca", R.drawable.ca);
    _flagIds.put("ch", R.drawable.ch);
    _flagIds.put("ca", R.drawable.ca);
    _flagIds.put("cn", R.drawable.cn);
    _flagIds.put("cz", R.drawable.cz);
    _flagIds.put("dk", R.drawable.dk);
    _flagIds.put("ee", R.drawable.ee);
    _flagIds.put("gb", R.drawable.gb);
    _flagIds.put("hk", R.drawable.hk);
    _flagIds.put("hr", R.drawable.hr);
    _flagIds.put("hu", R.drawable.hu);
    _flagIds.put("id", R.drawable.id);
    _flagIds.put("in", R.drawable.in);
    _flagIds.put("is", R.drawable.is);
    _flagIds.put("jp", R.drawable.jp);
    _flagIds.put("kr", R.drawable.kr);
    _flagIds.put("lt", R.drawable.lt);
    _flagIds.put("lv", R.drawable.lv);
    _flagIds.put("mx", R.drawable.mx);
    _flagIds.put("my", R.drawable.my);
    _flagIds.put("no", R.drawable.no);
    _flagIds.put("nz", R.drawable.nz);
    _flagIds.put("ph", R.drawable.ph);
    _flagIds.put("pl", R.drawable.pl);
    _flagIds.put("ro", R.drawable.ro);
    _flagIds.put("ru", R.drawable.ru);
    _flagIds.put("se", R.drawable.se);
    _flagIds.put("sg", R.drawable.sg);
    _flagIds.put("th", R.drawable.th);
    _flagIds.put("tr", R.drawable.tr);
    _flagIds.put("us", R.drawable.us);
    _flagIds.put("xa", R.drawable.xa);
    _flagIds.put("za", R.drawable.za);
    _flagIds.put("eu", R.drawable.eu);
  }
  
  public ExchangeRate() {
    _currencies =  new ArrayList<CurrencyInfo>(DEFAULT_SIZE);
    _currencyCodesCache = new ArrayList<String>(DEFAULT_SIZE);
  }
  
//  public ExchangeRate(HeaderInfo header, CurrencyInfo[] currencies ) {
//    _header = header;
//    _currencies = new ArrayList<CurrencyInfo>(currencies.length);
//    for (CurrencyInfo currencyInfo : currencies) {
//      _currencies.add(currencyInfo);
//    }
//  }
  
  public String getTimeStamp() {
    // still looks like hack :(
    
    String result = this.getHeader().getTitle().substring(
        this.getHeader().getTitle().length() - 10,
        this.getHeader().getTitle().length()
        );
    return result;
  }
  
  public void evaluateTendencies(ExchangeRate olderRates) {
    for(CurrencyInfo currency : _currencies) {
      CurrencyInfo oldCurrency = olderRates.getCurrencyByCode(currency.getCode());
      if ( oldCurrency != null ) {
        BigDecimal rate = new BigDecimal(currency.getRate());
        BigDecimal ratio = new BigDecimal(currency.getRatio());
        BigDecimal oldRate = new BigDecimal(oldCurrency.getRate());
        BigDecimal oldRatio = new BigDecimal(oldCurrency.getRatio());
        
        rate = rate.multiply(ratio);
        oldRate = oldRate.multiply(oldRatio);
        
        int res = rate.compareTo(oldRate);
        if ( res < 0 ) {
          currency.setTendency(Tendency.TendencyDown);
        }
        else if ( res > 0 ) {
          currency.setTendency(Tendency.TendencyUp);
        }
        else {
          currency.setTendency(Tendency.TendencyEqual);
        }
      }
    }
  }
  
  public static int getResourceFromCode(CurrencyInfo ci) {
    return _flagIds.get(ci.getCountryCode()) != null ?
        _flagIds.get(ci.getCountryCode()) : R.drawable.unknown;
  }
  
  public static int getResourceFromCode(String code) {
    String smallCode = code.substring(0, 2).toLowerCase();
    return _flagIds.get(smallCode) != null ?
        _flagIds.get(smallCode) : R.drawable.unknown;
  }
  
  public static int getResourceFromTendency(Tendency tendency) {
    switch(tendency) {
    case TendencyUp:
      return R.drawable.arrow_up;
    case TendencyDown:
      return R.drawable.arrow_down;
    case TendencyEqual:
    case TendencyUnknown:
    default:
      break;
    }
    
    return 0; // 0 sets image resouce to nothing
  }
  
  public void add(CurrencyInfo currency) {
    _currencies.add(currency);
    _currencyCodesCache.add(currency.getCode());
  }
  
  public void addHeader(HeaderInfo header) {
    _header = header;
  }
  
  public HeaderInfo getHeader() {
    return _header;
  }
  
  public List<CurrencyInfo> getItems() {
    return _currencies;
  }
  
  public boolean isHeaderAvailable() {
    return (_header != null);
  }
  
  public void sort() {
    Collections.sort(_currencies, new Comparator<CurrencyInfo>() {
      @Override
      public int compare(CurrencyInfo object1, CurrencyInfo object2) {
        return object1.getCode().compareTo(object2.getCode());
      }
    });
  }
  
  public CurrencyInfo[] getCurrencies() {
    CurrencyInfo[] currencies = new CurrencyInfo[_currencies.size()];
    _currencies.toArray(currencies);
    return currencies;
  }
  
  public String[] currenciesToStringArray() {
    String[] results = new String[ _currencyCodesCache.size() ];
    _currencyCodesCache.toArray(results);
    return results;
  }
  
  public CurrencyInfo getCurrencyByCode(String code) {
    for (CurrencyInfo ci : _currencies) {
      if ( ci.getCode().equalsIgnoreCase(code) )
        return ci;
    }
    return null;
  }
  
  public int count() {
    return _currencies.size();
  }
  
  public void clear() {
    _currencies.clear();
  }
  
  //// Parcelable implementation ////
  
  public ExchangeRate(Parcel in) {
    _header = in.readParcelable(HeaderInfo.class.getClassLoader());
    
    _currencies =  new ArrayList<CurrencyInfo>(DEFAULT_SIZE);
    in.readTypedList(this._currencies, new Parcelable.Creator<CurrencyInfo>() {
      @Override
      public CurrencyInfo createFromParcel(Parcel source) {
        return new CurrencyInfo(source);
      }
      
      @Override
      public CurrencyInfo[] newArray(int size) {
        return new CurrencyInfo[size];
      }
    });
    
    _currencyCodesCache = new ArrayList<String>(DEFAULT_SIZE);
    in.readList(_currencyCodesCache, null);
  }
  
  public static final Parcelable.Creator<ExchangeRate> CREATOR = new Creator<ExchangeRate>() {
    
    @Override
    public ExchangeRate[] newArray(int size) {
      return new ExchangeRate[size];
    }
    
    @Override
    public ExchangeRate createFromParcel(Parcel source) {
      return new ExchangeRate(source);
    }
  };
  
  @Override
  public int describeContents() {
    // TODO Auto-generated method stub
    return 0;
  }
  
  @Override
  public void writeToParcel(Parcel dest, int flags) {
    dest.writeParcelable(_header, flags);
    dest.writeTypedList(_currencies);
    dest.writeList(_currencyCodesCache);
  }
  
}

Java Source Code List

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