feat(interactions): Add Interactions API support for Java SDK

examples/src/main/java/com/google/genai/examples/FileSearchCallContentExample.java

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed 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
+ *
+ *      https://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 com.google.genai.examples;
+
+import com.google.genai.types.interactions.content.FileSearchCallContent;
+
+/**
+ * Example demonstrating the usage of FileSearchCallContent.
+ *
+ * <p>FileSearchCallContent represents a file search operation call in the Interactions API.
+ * Unlike other tool calls, FileSearchCallContent contains only the type and call ID.
+ * All search configuration (stores, top_k, filters) is defined in the FileSearch.
+ */
+public class FileSearchCallContentExample {
+
+  public static void main(String[] args) {
+    // Example 1: Create FileSearchCallContent using builder
+    FileSearchCallContent content1 =
+        FileSearchCallContent.builder()
+            .id("file-search-call-123")
+            .build();
+
+    System.out.println("FileSearchCallContent (using builder) JSON:");
+    System.out.println(content1.toJson());
+    System.out.println();
+
+    // Example 2: Create FileSearchCallContent using convenience method
+    FileSearchCallContent content2 =
+        FileSearchCallContent.of("call-456");
+
+    System.out.println("FileSearchCallContent (using of() method) JSON:");
+    System.out.println(content2.toJson());
+    System.out.println();
+
+    // Example 3: Deserialize from JSON
+    String json = content2.toJson();
+    FileSearchCallContent deserialized = FileSearchCallContent.fromJson(json);
+
+    System.out.println("Deserialized FileSearchCallContent:");
+    System.out.println("  ID: " + deserialized.id());
+    System.out.println();
+
+    // Example 4: Create FileSearchCallContent without ID (optional)
+    FileSearchCallContent content3 =
+        FileSearchCallContent.builder()
+            .build();
+
+    System.out.println("FileSearchCallContent (no ID) JSON:");
+    System.out.println(content3.toJson());
+  }
+}