1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portlet.currencyconverter.util;
24  
25  import com.liferay.portal.kernel.util.GetterUtil;
26  import com.liferay.portal.kernel.util.HttpUtil;
27  import com.liferay.portal.kernel.util.StringPool;
28  import com.liferay.portal.kernel.util.Time;
29  import com.liferay.portal.kernel.webcache.WebCacheException;
30  import com.liferay.portal.kernel.webcache.WebCacheItem;
31  import com.liferay.portlet.currencyconverter.model.Currency;
32  
33  import java.util.StringTokenizer;
34  
35  /**
36   * <a href="CurrencyWebCacheItem.java.html"><b><i>View Source</i></b></a>
37   *
38   * @author Brian Wing Shun Chan
39   *
40   */
41  public class CurrencyWebCacheItem implements WebCacheItem {
42  
43      public CurrencyWebCacheItem(String symbol) {
44          _symbol = symbol;
45      }
46  
47      public Object convert(String key) throws WebCacheException {
48          String symbol = _symbol;
49          double rate = 0.0;
50  
51          try {
52              if (symbol.length() == 6) {
53                  String fromSymbol = symbol.substring(0, 3);
54                  String toSymbol = symbol.substring(3, 6);
55  
56                  if (!CurrencyUtil.isCurrency(fromSymbol) ||
57                      !CurrencyUtil.isCurrency(toSymbol)) {
58  
59                      throw new WebCacheException(symbol);
60                  }
61              }
62              else if (symbol.length() == 3) {
63                  if (!CurrencyUtil.isCurrency(symbol)) {
64                      throw new WebCacheException(symbol);
65                  }
66              }
67              else {
68                  throw new WebCacheException(symbol);
69              }
70  
71              String text = HttpUtil.URLtoString(
72                  "http://finance.yahoo.com/d/quotes.csv?s=" +
73                      symbol + "=X&f=sl1d1t1c1ohgv&e=.csv");
74  
75              StringTokenizer st = new StringTokenizer(text, StringPool.COMMA);
76  
77              // Skip symbol
78  
79              st.nextToken();
80  
81              rate = GetterUtil.getDouble(
82                  st.nextToken().replace('"', ' ').trim());
83          }
84          catch (Exception e) {
85              throw new WebCacheException(e);
86          }
87  
88          return new Currency(symbol, rate);
89      }
90  
91      public long getRefreshTime() {
92          return _REFRESH_TIME;
93      }
94  
95      private static final long _REFRESH_TIME = Time.MINUTE * 20;
96  
97      private String _symbol;
98  
99  }