1 files changed, 84 insertions, 0 deletions
diff --git a/tags/java/sca/1.5.1-RC1/demos/xml-bigbank/src/main/java/bigbank/ExchangeRateImpl.java b/tags/java/sca/1.5.1-RC1/demos/xml-bigbank/src/main/java/bigbank/ExchangeRateImpl.java
new file mode 100644
index 0000000000..fcb3707cfe
--- /dev/null
+++ b/tags/java/sca/1.5.1-RC1/demos/xml-bigbank/src/main/java/bigbank/ExchangeRateImpl.java
@@ -0,0 +1,84 @@
+/*
+ * 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);
+        }
+    }
+}