| CurrencyWebCacheItem.java |
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 }