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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 bigbank;
+
+import java.io.ByteArrayInputStream;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathFactory;
+
+import org.osoa.sca.ServiceRuntimeException;
+import org.osoa.sca.annotations.Reference;
+import org.osoa.sca.annotations.Service;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+
+import com.sun.syndication.feed.synd.SyndEntry;
+import com.sun.syndication.feed.synd.SyndFeed;
+
+/**
+ * @version $Rev$ $Date$
+ */
+@Service(ExchangeRate.class)
+public class ExchangeRateImpl {
+ @Reference
+ protected CurrencyExchange exchangeRate;
+
+ private final DocumentBuilder builder;
+
+ public ExchangeRateImpl() {
+ try {
+ builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
+ } catch (ParserConfigurationException e) {
+ throw new IllegalArgumentException(e);
+ }
+ }
+
+ /**
+ * Retrieve the live currency exchange rate from a live feed and extract the data for a given
+ * currecy using XPath
+ * @param currency The currency
+ * @return The exchange rate
+ */
+ public double getExchangeRate(String currency) {
+ try {
+ System.out.println("Retrieving exchange rate...");
+ SyndFeed feed = exchangeRate.getRates();
+ SyndEntry entry = (SyndEntry)feed.getEntries().get(0);
+ String rateTable = entry.getDescription().getValue();
+
+ Document doc = builder.parse(new ByteArrayInputStream(rateTable.getBytes()));
+ Node node = doc.getDocumentElement();
+ XPath path = XPathFactory.newInstance().newXPath();
+ XPathExpression exp = path.compile("/TABLE/TR[TD[1]='" + currency.toUpperCase() + "']/TD[2]");
+ Node rateNode = (Node)exp.evaluate(node, XPathConstants.NODE);
+ double rate = Double.valueOf(rateNode.getTextContent().trim());
+ System.out.println("Exchange rate: USD 1.0=" + currency + " " + rate);
+ return rate;
+ } catch (Exception e) {
+ throw new ServiceRuntimeException(e);
+ }
+ }
+}