chore: Avoid sending unnecessary requests if corresponding extensions are absent

src/main/java/io/appium/java_client/AppiumDriver.java

@@ -32,6 +32,7 @@
 import org.openqa.selenium.MutableCapabilities;
 import org.openqa.selenium.OutputType;
 import org.openqa.selenium.SessionNotCreatedException;
+import org.openqa.selenium.UnsupportedCommandException;
 import org.openqa.selenium.WebDriverException;
 import org.openqa.selenium.remote.CapabilityType;
 import org.openqa.selenium.remote.DriverCommand;
@@ -48,7 +49,9 @@
 import java.net.URL;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 import static io.appium.java_client.internal.CapabilityHelpers.APPIUM_PREFIX;
 import static io.appium.java_client.remote.MobileCapabilityType.AUTOMATION_NAME;
@@ -64,13 +67,15 @@ public class AppiumDriver extends RemoteWebDriver implements
         ExecutesDriverScript,
         LogsEvents,
         HasBrowserCheck,
+        CanRememberExtensionPresence,
         HasSettings {
 
     private static final ErrorHandler errorHandler = new ErrorHandler(new ErrorCodesMobile(), true);
     // frequently used command parameters
     private final URL remoteAddress;
     protected final RemoteLocationContext locationContext;
     private final ExecuteMethod executeMethod;
+    private final Set<String> absentExtensionNames = new HashSet<>();
 
     /**
      * Creates a new instance based on command {@code executor} and {@code capabilities}.
@@ -327,4 +332,18 @@ public X convertFromPngBytes(byte[] png) {
             }
         });
     }
+
+    @Override
+    public AppiumDriver assertExtensionExists(String extName) {
+        if (absentExtensionNames.contains(extName)) {
+            throw new UnsupportedCommandException();
+        }
+        return this;
+    }
+
+    @Override
+    public AppiumDriver markExtensionAbsence(String extName) {
+        absentExtensionNames.add(extName);
+        return this;
+    }
 }

src/main/java/io/appium/java_client/CanRememberExtensionPresence.java

@@ -0,0 +1,25 @@
+package io.appium.java_client;
+
+import org.openqa.selenium.UnsupportedCommandException;
+
+public interface CanRememberExtensionPresence {
+    /**
+     * Verifies if the given extension is not present in the list of absent extensions
+     * for the given driver instance.
+     * This API is designed for private usage.
+     *
+     * @param extName extension name.
+     * @return self instance for chaining.
+     * @throws UnsupportedCommandException if the extension is listed in the list of absents.
+     */
+    ExecutesMethod assertExtensionExists(String extName);
+
+    /**
+     * Marks the given extension as absent for the given driver instance.
+     * This API is designed for private usage.
+     *
+     * @param extName extension name.
+     * @return self instance for chaining.
+     */
+    ExecutesMethod markExtensionAbsence(String extName);
+}

src/main/java/io/appium/java_client/HasAppStrings.java

@@ -25,19 +25,20 @@
 import static io.appium.java_client.MobileCommand.GET_STRINGS;
 import static io.appium.java_client.MobileCommand.prepareArguments;
 
-public interface HasAppStrings extends ExecutesMethod {
+public interface HasAppStrings extends ExecutesMethod, CanRememberExtensionPresence {
     /**
      * Get all defined Strings from an app for the default language.
      * See the documentation for 'mobile: getAppStrings' extension for more details.
      *
      * @return a map with localized strings defined in the app
      */
     default Map<String, String> getAppStringMap() {
+        final String extName = "mobile: getAppStrings";
         try {
-            return CommandExecutionHelper.executeScript(this, "mobile: getAppStrings");
+            return CommandExecutionHelper.executeScript(assertExtensionExists(extName), extName);
         } catch (UnsupportedCommandException e) {
             // TODO: Remove the fallback
-            return CommandExecutionHelper.execute(this, GET_STRINGS);
+            return CommandExecutionHelper.execute(markExtensionAbsence(extName), GET_STRINGS);
         }
     }
 
@@ -49,14 +50,16 @@ default Map<String, String> getAppStringMap() {
      * @return a map with localized strings defined in the app
      */
     default Map<String, String> getAppStringMap(String language) {
+        final String extName = "mobile: getAppStrings";
         try {
-            return CommandExecutionHelper.executeScript(this, "mobile: getAppStrings", ImmutableMap.of(
+            return CommandExecutionHelper.executeScript(assertExtensionExists(extName), extName, ImmutableMap.of(
                     "language", language
             ));
         } catch (UnsupportedCommandException e) {
             // TODO: Remove the fallback
             return CommandExecutionHelper.execute(
-                    this, new AbstractMap.SimpleEntry<>(GET_STRINGS, prepareArguments("language", language))
+                    markExtensionAbsence(extName),
+                    new AbstractMap.SimpleEntry<>(GET_STRINGS, prepareArguments("language", language))
             );
         }
     }
@@ -71,8 +74,9 @@ default Map<String, String> getAppStringMap(String language) {
      * @return a map with localized strings defined in the app
      */
     default Map<String, String> getAppStringMap(String language, String stringFile) {
+        final String extName = "mobile: getAppStrings";
         try {
-            return CommandExecutionHelper.executeScript(this, "mobile: getAppStrings", ImmutableMap.of(
+            return CommandExecutionHelper.executeScript(assertExtensionExists(extName), extName, ImmutableMap.of(
                     "language", language,
                     "stringFile", stringFile
             ));
@@ -81,7 +85,8 @@ default Map<String, String> getAppStringMap(String language, String stringFile)
             String[] parameters = new String[]{"language", "stringFile"};
             Object[] values = new Object[]{language, stringFile};
             return CommandExecutionHelper.execute(
-                    this, new AbstractMap.SimpleEntry<>(GET_STRINGS, prepareArguments(parameters, values))
+                    markExtensionAbsence(extName),
+                    new AbstractMap.SimpleEntry<>(GET_STRINGS, prepareArguments(parameters, values))
             );
         }
     }

src/main/java/io/appium/java_client/HasOnScreenKeyboard.java

@@ -5,7 +5,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static io.appium.java_client.MobileCommand.isKeyboardShownCommand;
 
-public interface HasOnScreenKeyboard extends ExecutesMethod {
+public interface HasOnScreenKeyboard extends ExecutesMethod, CanRememberExtensionPresence {
 
     /**
      * Check if the on-screen keyboard is displayed.
@@ -14,11 +14,14 @@ public interface HasOnScreenKeyboard extends ExecutesMethod {
      * @return true if keyboard is displayed. False otherwise
      */
     default boolean isKeyboardShown() {
+        final String extName = "mobile: isKeyboardShown";
         try {
-            return checkNotNull(CommandExecutionHelper.executeScript(this, "mobile: isKeyboardShown"));
+            return checkNotNull(CommandExecutionHelper.executeScript(assertExtensionExists(extName), extName));
         } catch (UnsupportedCommandException e) {
             // TODO: Remove the fallback
-            return checkNotNull(CommandExecutionHelper.execute(this, isKeyboardShownCommand()));
+            return checkNotNull(
+                    CommandExecutionHelper.execute(markExtensionAbsence(extName), isKeyboardShownCommand())
+            );
         }
     }
 }

src/main/java/io/appium/java_client/HidesKeyboard.java

@@ -20,7 +20,7 @@
 
 import static io.appium.java_client.MobileCommand.HIDE_KEYBOARD;
 
-public interface HidesKeyboard extends ExecutesMethod {
+public interface HidesKeyboard extends ExecutesMethod, CanRememberExtensionPresence {
 
     /**
      * Hides the keyboard if it is showing.
@@ -30,11 +30,12 @@ public interface HidesKeyboard extends ExecutesMethod {
      * See the documentation for 'mobile: hideKeyboard' extension for more details.
      */
     default void hideKeyboard() {
+        final String extName = "mobile: hideKeyboard";
         try {
-            CommandExecutionHelper.executeScript(this, "mobile: hideKeyboard");
+            CommandExecutionHelper.executeScript(assertExtensionExists(extName), extName);
         } catch (UnsupportedCommandException e) {
             // TODO: Remove the fallback
-            CommandExecutionHelper.execute(this, HIDE_KEYBOARD);
+            CommandExecutionHelper.execute(markExtensionAbsence(extName), HIDE_KEYBOARD);
         }
     }
 }

src/main/java/io/appium/java_client/HidesKeyboardWithKeyName.java

@@ -35,13 +35,14 @@ public interface HidesKeyboardWithKeyName extends HidesKeyboard {
      *                keyboard.
      */
     default void hideKeyboard(String keyName) {
+        final String extName = "mobile: hideKeyboard";
         try {
-            CommandExecutionHelper.executeScript(this, "mobile: hideKeyboard", ImmutableMap.of(
+            CommandExecutionHelper.executeScript(assertExtensionExists(extName), extName, ImmutableMap.of(
                 "keys", ImmutableList.of(keyName)
             ));
         } catch (UnsupportedCommandException e) {
             // TODO: Remove the fallback
-            CommandExecutionHelper.execute(this, hideKeyboardCommand(keyName));
+            CommandExecutionHelper.execute(markExtensionAbsence(extName), hideKeyboardCommand(keyName));
         }
     }