Add Text Detection APIs

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/WatsonxParameters.java

@@ -52,9 +52,9 @@ public String getTransactionId() {
      */
     @SuppressWarnings("unchecked")
     public static abstract class Builder<T extends Builder<T>> {
-        private String projectId;
-        private String spaceId;
-        private String transactionId;
+        protected String projectId;
+        protected String spaceId;
+        protected String transactionId;
 
         /**
          * Sets the project id.
@@ -114,7 +114,7 @@ public String getModelId() {
          */
         @SuppressWarnings("unchecked")
         public static abstract class Builder<T extends Builder<T>> extends WatsonxParameters.Builder<T> {
-            private String modelId;
+            protected String modelId;
 
             /**
              * Sets the model id.

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/WatsonxService.java

@@ -5,6 +5,7 @@
 package com.ibm.watsonx.ai;
 
 import static java.util.Objects.isNull;
+import static java.util.Objects.nonNull;
 import static java.util.Objects.requireNonNull;
 import static java.util.Objects.requireNonNullElse;
 import java.net.URI;
@@ -13,6 +14,7 @@
 import com.ibm.watsonx.ai.core.auth.AuthenticationProvider;
 import com.ibm.watsonx.ai.core.auth.iam.IAMAuthenticator;
 import com.ibm.watsonx.ai.deployment.DeploymentService;
+import com.ibm.watsonx.ai.detection.DetectionService;
 import com.ibm.watsonx.ai.embedding.EmbeddingService;
 import com.ibm.watsonx.ai.foundationmodel.FoundationModelService;
 import com.ibm.watsonx.ai.rerank.RerankService;
@@ -38,6 +40,7 @@
  * @see TimeSeriesService
  * @see FoundationModelService
  * @see ToolService
+ * @see DetectionService
  */
 public abstract class WatsonxService {
 
@@ -176,6 +179,9 @@ public AuthenticationProvider getAuthenticationProvider() {
      * Abstract base class for watsonx services that require a project or space context.
      */
     public static abstract class ProjectService extends WatsonxService {
+
+        protected record ProjectSpace(String projectId, String spaceId) {}
+
         protected final String projectId;
         protected final String spaceId;
 
@@ -188,6 +194,12 @@ protected ProjectService(Builder<?> builder) {
                 throw new NullPointerException("Either projectId or spaceId must be provided");
         }
 
+        protected ProjectSpace resolveProjectSpace(WatsonxParameters parameters) {
+            return nonNull(parameters.getProjectId()) || nonNull(parameters.getSpaceId())
+                ? new ProjectSpace(parameters.getProjectId(), parameters.getSpaceId())
+                : new ProjectSpace(projectId, spaceId);
+        }
+
         @SuppressWarnings("unchecked")
         protected static abstract class Builder<T extends Builder<T>> extends WatsonxService.Builder<T> {
             private String projectId;

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/detection/BaseDetectionRequest.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright IBM Corp. 2025 - 2025
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.ibm.watsonx.ai.detection;
+
+import java.util.Map;
+
+/**
+ * Represents a generic detection request.
+ */
+abstract class BaseDetectionRequest {
+    private final Map<String, Map<String, Object>> detectors;
+    private final String projectId;
+    private final String spaceId;
+
+    protected BaseDetectionRequest(Map<String, Map<String, Object>> detectors, String projectId, String spaceId) {
+        this.detectors = detectors;
+        this.projectId = projectId;
+        this.spaceId = spaceId;
+    }
+
+    public Map<String, Map<String, Object>> getDetectors() {
+        return detectors;
+    }
+
+    public String getProjectId() {
+        return projectId;
+    }
+
+    public String getSpaceId() {
+        return spaceId;
+    }
+}

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/detection/BaseDetectionResponse.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright IBM Corp. 2025 - 2025
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.ibm.watsonx.ai.detection;
+
+/**
+ * Represents the response for a generic detection request.
+ */
+abstract class BaseDetectionResponse {
+    protected String text;
+    protected String detectionType;
+    protected String detection;
+    protected float score;
+
+    public String getText() {
+        return text;
+    }
+
+    public void setText(String text) {
+        this.text = text;
+    }
+
+    public String getDetectionType() {
+        return detectionType;
+    }
+
+    public void setDetectionType(String detectionType) {
+        this.detectionType = detectionType;
+    }
+
+    public String getDetection() {
+        return detection;
+    }
+
+    public void setDetection(String detection) {
+        this.detection = detection;
+    }
+
+    public float getScore() {
+        return score;
+    }
+
+    public void setScore(float score) {
+        this.score = score;
+    }
+}

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/detection/DefaultRestClient.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright IBM Corp. 2025 - 2025
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.ibm.watsonx.ai.detection;
+
+import static com.ibm.watsonx.ai.core.Json.fromJson;
+import static com.ibm.watsonx.ai.core.Json.toJson;
+import static java.util.Objects.nonNull;
+import static java.util.Objects.requireNonNull;
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpRequest;
+import java.net.http.HttpRequest.BodyPublishers;
+import java.net.http.HttpResponse.BodyHandlers;
+import com.ibm.watsonx.ai.core.factory.HttpClientFactory;
+import com.ibm.watsonx.ai.core.http.SyncHttpClient;
+import com.ibm.watsonx.ai.core.http.interceptors.LoggerInterceptor.LogMode;
+import com.ibm.watsonx.ai.core.spi.json.TypeToken;
+
+/**
+ * Default implementation of the {@link DetectionRestClient} abstract class.
+ */
+final class DefaultRestClient extends DetectionRestClient {
+    private final SyncHttpClient syncHttpClient;
+
+    DefaultRestClient(Builder builder) {
+        super(builder);
+        requireNonNull(authenticationProvider, "authenticationProvider is mandatory");
+        syncHttpClient = HttpClientFactory.createSync(authenticationProvider, LogMode.of(logRequests, logResponses));
+    }
+
+    @Override
+    public DetectionResponse<DetectionTextResponse> detect(String transactionId, TextDetectionContentDetectors request) {
+
+        var httpRequest = HttpRequest
+            .newBuilder(URI.create(baseUrl + "/ml/v1/text/detection?version=%s".formatted(version)))
+            .header("Content-Type", "application/json")
+            .header("Accept", "application/json")
+            .POST(BodyPublishers.ofString(toJson(request)))
+            .timeout(timeout);
+
+        if (nonNull(transactionId))
+            httpRequest.header(TRANSACTION_ID_HEADER, transactionId);
+
+        try {
+
+            var httpReponse = syncHttpClient.send(httpRequest.build(), BodyHandlers.ofString());
+            return fromJson(httpReponse.body(), new TypeToken<DetectionResponse<DetectionTextResponse>>() {});
+
+        } catch (IOException | InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Returns a new {@link Builder} instance.
+     */
+    static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder class for constructing {@link DefaultRestClient} instances with configurable parameters.
+     */
+    public final static class Builder extends DetectionRestClient.Builder {
+
+        private Builder() {}
+
+        /**
+         * Builds a {@link DefaultRestClient} instance using the configured parameters.
+         *
+         * @return a new instance of {@link DefaultRestClient}
+         */
+        public DefaultRestClient build() {
+            return new DefaultRestClient(this);
+        }
+    }
+}

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/detection/DetectionResponse.java

@@ -0,0 +1,12 @@
+/*
+ * Copyright IBM Corp. 2025 - 2025
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.ibm.watsonx.ai.detection;
+
+import java.util.List;
+
+/**
+ * Represents the response returned by the Text Detection API.
+ */
+public record DetectionResponse<T extends BaseDetectionResponse>(List<T> detections) {}

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/detection/DetectionRestClient.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright IBM Corp. 2025 - 2025
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.ibm.watsonx.ai.detection;
+
+import java.util.ServiceLoader;
+import java.util.function.Supplier;
+import com.ibm.watsonx.ai.WatsonxRestClient;
+
+/**
+ * Abstraction of a REST client for interacting with the IBM watsonx.ai Text Detection APIs.
+ */
+public abstract class DetectionRestClient extends WatsonxRestClient {
+
+    protected DetectionRestClient(Builder builder) {
+        super(builder);
+    }
+
+    public abstract DetectionResponse<DetectionTextResponse> detect(String transactionId, TextDetectionContentDetectors request);
+
+    /**
+     * Creates a new {@link Builder} using the first available {@link DetectionRestClientBuilderFactory} discovered via {@link ServiceLoader}.
+     * <p>
+     * If no factory is found, falls back to the default {@link DefaultRestClient}.
+     */
+    static DetectionRestClient.Builder builder() {
+        return ServiceLoader.load(DetectionRestClientBuilderFactory.class).findFirst()
+            .map(Supplier::get)
+            .orElse(DefaultRestClient.builder());
+    }
+
+    /**
+     * Builder abstract class for constructing {@link DetectionRestClient} instances with configurable parameters.
+     */
+    public abstract static class Builder extends WatsonxRestClient.Builder<DetectionRestClient, Builder> {}
+
+    /**
+     * Service Provider Interface for supplying custom {@link Builder} implementations.
+     * <p>
+     * This allows frameworks to provide their own client implementations.
+     */
+    public interface DetectionRestClientBuilderFactory extends Supplier<DetectionRestClient.Builder> {}
+}

modules/watsonx-ai/src/main/java/com/ibm/watsonx/ai/detection/DetectionService.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright IBM Corp. 2025 - 2025
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.ibm.watsonx.ai.detection;
+
+import static java.util.Objects.requireNonNull;
+import com.ibm.watsonx.ai.WatsonxService.ProjectService;
+import com.ibm.watsonx.ai.core.auth.AuthenticationProvider;
+
+/**
+ * Service class to interact with IBM watsonx.ai Text Detection APIs.
+ * <p>
+ * <b>Example usage:</b>
+ *
+ * <pre>{@code
+ * DetectionService detectionService = DetectionService.builder()
+ *     .baseUrl("https://...")  // or use CloudRegion
+ *     .apiKey("my-api-key")    // creates an IAM-based AuthenticationProvider
+ *     .projectId("my-project-id")
+ *     .build();
+ *
+ * DetectionResponse<DetectionTextResponse> response = detectionService.detect(
+ *     DetectionTextRequest.builder()
+ *         .input("...")
+ *         .detectors(Pii.create(), Hap.builder().threshold(0.3).build())
+ *         .build()
+ * );
+ * }</pre>
+ *
+ * To use a custom authentication mechanism, configure it explicitly with {@code authenticationProvider(AuthenticationProvider)}.
+ *
+ * @see AuthenticationProvider
+ */
+public final class DetectionService extends ProjectService {
+
+    private final DetectionRestClient client;
+
+    private DetectionService(Builder builder) {
+        super(builder);
+        requireNonNull(builder.getAuthenticationProvider(), "authenticationProvider cannot be null");
+        client = DetectionRestClient.builder()
+            .baseUrl(baseUrl)
+            .version(version)
+            .logRequests(logRequests)
+            .logResponses(logResponses)
+            .timeout(timeout)
+            .authenticationProvider(builder.getAuthenticationProvider())
+            .build();
+    }
+
+    public DetectionResponse<DetectionTextResponse> detect(DetectionTextRequest request) {
+        var projectSpace = resolveProjectSpace(request);
+        var transactionId = request.getTransactionId();
+        var textDetectionRequest =
+            new TextDetectionContentDetectors(request.getInput(), request.getDetectors(), projectSpace.projectId(), projectSpace.spaceId());
+        return client.detect(transactionId, textDetectionRequest);
+    }
+
+    /**
+     * Returns a new {@link Builder} instance.
+     * <p>
+     * <b>Example usage:</b>
+     *
+     * <pre>{@code
+     * DetectionService detectionService = DetectionService.builder()
+     *     .baseUrl("https://...")  // or use CloudRegion
+     *     .apiKey("my-api-key")    // creates an IAM-based AuthenticationProvider
+     *     .projectId("my-project-id")
+     *     .build();
+     *
+     * DetectionResponse<DetectionTextResponse> response = detectionService.detect(
+     *     DetectionTextRequest.builder()
+     *         .input("...")
+     *         .detectors(Pii.create(), Hap.builder().threshold(0.3).build())
+     *         .build()
+     * );
+     * }</pre>
+     *
+     * @return {@link Builder} instance.
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder class for constructing {@link DetectionService} instances with configurable parameters.
+     */
+    public final static class Builder extends ProjectService.Builder<Builder> {
+
+        private Builder() {}
+
+        /**
+         * Builds a {@link DetectionService} instance using the configured parameters.
+         *
+         * @return a new instance of {@link DetectionService}
+         */
+        public DetectionService build() {
+            return new DetectionService(this);
+        }
+    }
+}