BAEL-1570 (#3762)

* Create pom.xml

* Update pom.xml

* Create pom.xml

* Update pom.xml

* add impl

* add app

java-spi/exchange-rate-impl/pom.xml

@@ -0,0 +1,42 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>exchange-rate-impl</artifactId>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>java-spi</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.baeldung</groupId>
+            <artifactId>exchange-rate-api</artifactId>
+            <version>1.0.0-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>3.10.0</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.json.bind</groupId>
+            <artifactId>javax.json.bind-api</artifactId>
+            <version>1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.eclipse</groupId>
+            <artifactId>yasson</artifactId>
+            <version>1.0.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish</groupId>
+            <artifactId>javax.json</artifactId>
+            <version>1.1.2</version>
+        </dependency>
+    </dependencies>
+
+</project>

java-spi/exchange-rate-impl/src/main/java/com/baeldung/rate/impl/QuoteResponse.java

@@ -0,0 +1,26 @@
+package com.baeldung.rate.impl;
+
+import com.baeldung.rate.api.Quote;
+
+import java.util.List;
+
+public class QuoteResponse {
+    private List<Quote> result;
+    private String error;
+
+    public List<Quote> getResult() {
+        return result;
+    }
+
+    public void setResult(List<Quote> result) {
+        this.result = result;
+    }
+
+    public String getError() {
+        return error;
+    }
+
+    public void setError(String error) {
+        this.error = error;
+    }
+}

java-spi/exchange-rate-impl/src/main/java/com/baeldung/rate/impl/QuoteResponseWrapper.java

@@ -0,0 +1,13 @@
+package com.baeldung.rate.impl;
+
+public class QuoteResponseWrapper {
+    private QuoteResponse quoteResponse;
+
+    public QuoteResponse getQuoteResponse() {
+        return quoteResponse;
+    }
+
+    public void setQuoteResponse(QuoteResponse quoteResponse) {
+        this.quoteResponse = quoteResponse;
+    }
+}

java-spi/exchange-rate-impl/src/main/java/com/baeldung/rate/impl/YahooFinanceExchangeRateProvider.java

@@ -0,0 +1,13 @@
+package com.baeldung.rate.impl;
+
+import com.baeldung.rate.api.QuoteManager;
+import com.baeldung.rate.spi.ExchangeRateProvider;
+
+public class YahooFinanceExchangeRateProvider implements ExchangeRateProvider {
+
+    @Override
+    public QuoteManager create() {
+        return new YahooQuoteManagerImpl();
+    }
+
+}

java-spi/exchange-rate-impl/src/main/java/com/baeldung/rate/impl/YahooQuoteManagerImpl.java

@@ -0,0 +1,65 @@
+package com.baeldung.rate.impl;
+
+import com.baeldung.rate.api.Quote;
+import com.baeldung.rate.api.QuoteManager;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+import javax.json.bind.JsonbBuilder;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.time.LocalDate;
+import java.util.Currency;
+import java.util.List;
+
+public class YahooQuoteManagerImpl implements QuoteManager {
+
+    static final String URL_PROVIDER = "https://query1.finance.yahoo.com/v7/finance/quote";
+    OkHttpClient client = new OkHttpClient();
+
+    @Override
+    public List<Quote> getQuotes(String baseCurrency, LocalDate date) {
+
+        StringBuilder sb = new StringBuilder();
+        Currency.getAvailableCurrencies().forEach(currency -> {
+            if (!currency.equals(currency.getCurrencyCode())) {
+                sb.append(baseCurrency).append(currency.getCurrencyCode()).append("=X").append(",");
+            }
+        });
+
+        String value = "";
+        try {
+            value = URLEncoder.encode(sb.toString().substring(0, sb.toString().length() - 1), "UTF-8");
+        } catch (UnsupportedEncodingException e) {
+            e.printStackTrace();
+        }
+        String queryString = String.format("%s=%s", "symbols", value);
+        String response = doGetRequest(queryString);
+        System.out.println(response);
+        return map(response);
+    }
+
+    private List<Quote> map(String response) {
+        QuoteResponseWrapper qrw = JsonbBuilder.create().fromJson(response, QuoteResponseWrapper.class);
+        return qrw.getQuoteResponse().getResult();
+    }
+
+    String doGetRequest(String queryString) {
+        String fullUrl = URL_PROVIDER + "?" + queryString;
+
+        System.out.println(fullUrl);
+        Request request = new Request.Builder()
+                .url(fullUrl)
+                .build();
+        Response response = null;
+        try {
+            response = client.newCall(request).execute();
+            return response.body().string();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+}

java-spi/exchange-rate-impl/src/main/resources/META-INF/services/com.baeldung.rate.spi.ExchangeRateProvider

@@ -0,0 +1 @@
+com.baeldung.rate.impl.YahooFinanceExchangeRateProvider