immutable Pair, better performant HttpBearerAuth, consistent code-style (#20743)

* make Pair immutable and in google-code-style

* apply google-code-style to JavaTimeFormatter (to make it consistent with most other auto-generated java)

* move upperCaseBearer to ctor (scheme is final and private; only needs to be fixed once); also replaced Optional with ternary (perf and cleaner code)

* apply google-code-style to Authentication to make it consistent with rest of auth code

* fresh samples

samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/JavaTimeFormatter.java

@@ -22,43 +22,47 @@ import java.time.format.DateTimeParseException;
  */
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.15.0-SNAPSHOT")
 public class JavaTimeFormatter {
+  private DateTimeFormatter offsetDateTimeFormatter = DateTimeFormatter.ISO_OFFSET_DATE_TIME;
 
-    private DateTimeFormatter offsetDateTimeFormatter = DateTimeFormatter.ISO_OFFSET_DATE_TIME;
+  /**
+   * Get the date format used to parse/format {@code OffsetDateTime} parameters.
+   *
+   * @return DateTimeFormatter
+   */
+  public DateTimeFormatter getOffsetDateTimeFormatter() {
+    return offsetDateTimeFormatter;
+  }
 
-    /**
-     * Get the date format used to parse/format {@code OffsetDateTime} parameters.
-     * @return DateTimeFormatter
-     */
-    public DateTimeFormatter getOffsetDateTimeFormatter() {
-        return offsetDateTimeFormatter;
-    }
+  /**
+   * Set the date format used to parse/format {@code OffsetDateTime} parameters.
+   *
+   * @param offsetDateTimeFormatter {@code DateTimeFormatter}
+   */
+  public void setOffsetDateTimeFormatter(DateTimeFormatter offsetDateTimeFormatter) {
+    this.offsetDateTimeFormatter = offsetDateTimeFormatter;
+  }
 
-    /**
-     * Set the date format used to parse/format {@code OffsetDateTime} parameters.
-     * @param offsetDateTimeFormatter {@code DateTimeFormatter}
-     */
-    public void setOffsetDateTimeFormatter(DateTimeFormatter offsetDateTimeFormatter) {
-        this.offsetDateTimeFormatter = offsetDateTimeFormatter;
+  /**
+   * Parse the given string into {@code OffsetDateTime} object.
+   *
+   * @param str String
+   * @return {@code OffsetDateTime}
+   */
+  public OffsetDateTime parseOffsetDateTime(String str) {
+    try {
+      return OffsetDateTime.parse(str, offsetDateTimeFormatter);
+    } catch (DateTimeParseException e) {
+      throw new RuntimeException(e);
     }
+  }
 
-    /**
-     * Parse the given string into {@code OffsetDateTime} object.
-     * @param str String
-     * @return {@code OffsetDateTime}
-     */
-    public OffsetDateTime parseOffsetDateTime(String str) {
-        try {
-            return OffsetDateTime.parse(str, offsetDateTimeFormatter);
-        } catch (DateTimeParseException e) {
-            throw new RuntimeException(e);
-        }
-    }
-    /**
-     * Format the given {@code OffsetDateTime} object into string.
-     * @param offsetDateTime {@code OffsetDateTime}
-     * @return {@code OffsetDateTime} in string format
-     */
-    public String formatOffsetDateTime(OffsetDateTime offsetDateTime) {
-        return offsetDateTimeFormatter.format(offsetDateTime);
-    }
-}
+  /**
+   * Format the given {@code OffsetDateTime} object into string.
+   *
+   * @param offsetDateTime {@code OffsetDateTime}
+   * @return {@code OffsetDateTime} in string format
+   */
+  public String formatOffsetDateTime(OffsetDateTime offsetDateTime) {
+    return offsetDateTimeFormatter.format(offsetDateTime);
+  }
+}

samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/Pair.java

@@ -15,43 +15,23 @@ package org.openapitools.client;
 
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.15.0-SNAPSHOT")
 public class Pair {
-    private String name = "";
-    private String value = "";
+  private final String name;
+  private final String value;
 
-    public Pair (String name, String value) {
-        setName(name);
-        setValue(value);
-    }
+  public Pair(String name, String value) {
+    this.name = isValidString(name) ? name : "";
+    this.value = isValidString(value) ? value : "";
+  }
 
-    private void setName(String name) {
-        if (!isValidString(name)) {
-            return;
-        }
+  public String getName() {
+    return this.name;
+  }
 
-        this.name = name;
-    }
+  public String getValue() {
+    return this.value;
+  }
 
-    private void setValue(String value) {
-        if (!isValidString(value)) {
-            return;
-        }
-
-        this.value = value;
-    }
-
-    public String getName() {
-        return this.name;
-    }
-
-    public String getValue() {
-        return this.value;
-    }
-
-    private boolean isValidString(String arg) {
-        if (arg == null) {
-            return false;
-        }
-
-        return true;
-    }
+  private static boolean isValidString(String arg) {
+    return arg != null;
+  }
 }

samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/auth/Authentication.java

@@ -20,12 +20,12 @@ import java.util.List;
 
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.15.0-SNAPSHOT")
 public interface Authentication {
-    /**
-     * Apply authentication settings to header and query params.
-     *
-     * @param queryParams List of query parameters
-     * @param headerParams Map of header parameters
-     * @param cookieParams Map of cookie parameters
-     */
-    void applyToParams(List<Pair> queryParams, Map<String, String> headerParams, Map<String, String> cookieParams);
+  /**
+   * Apply authentication settings to header and query params.
+   *
+   * @param queryParams List of query parameters
+   * @param headerParams Map of header parameters
+   * @param cookieParams Map of cookie parameters
+   */
+  void applyToParams(List<Pair> queryParams, Map<String, String> headerParams, Map<String, String> cookieParams);
 }

samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/auth/HttpBearerAuth.java

@@ -17,7 +17,6 @@ import org.openapitools.client.Pair;
 
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.function.Supplier;
 
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.15.0-SNAPSHOT")
@@ -26,7 +25,7 @@ public class HttpBearerAuth implements Authentication {
   private Supplier<String> tokenSupplier;
 
   public HttpBearerAuth(String scheme) {
-    this.scheme = scheme;
+    this.scheme = upperCaseBearer(scheme);
   }
 
   /**
@@ -58,15 +57,14 @@ public class HttpBearerAuth implements Authentication {
 
   @Override
   public void applyToParams(List<Pair> queryParams, Map<String, String> headerParams, Map<String, String> cookieParams) {
-    String bearerToken = Optional.ofNullable(tokenSupplier).map(Supplier::get).orElse(null);
+    String bearerToken = tokenSupplier != null ? tokenSupplier.get() : null;
     if (bearerToken == null) {
       return;
     }
-
-    headerParams.put("Authorization", (scheme != null ? upperCaseBearer(scheme) + " " : "") + bearerToken);
+    headerParams.put("Authorization", (scheme != null ? scheme + " " : "") + bearerToken);
   }
 
   private static String upperCaseBearer(String scheme) {
-    return ("bearer".equalsIgnoreCase(scheme)) ? "Bearer" : scheme;
+    return "bearer".equalsIgnoreCase(scheme) ? "Bearer" : scheme;
   }
 }