chore: add function call sample (#29)

samples/src/main/ai.z.openapi.samples/FunctionCallingExample.java

@@ -0,0 +1,89 @@
+package ai.z.openapi.samples;
+
+import ai.z.openapi.ZaiClient;
+import ai.z.openapi.service.model.*;
+import ai.z.openapi.core.Constants;
+import java.util.*;
+
+public class FunctionCallingExample {
+
+    // Simulate weather API
+    public static Map<String, Object> getWeather(String location, String date) {
+        Map<String, Object> weather = new HashMap<>();
+        weather.put("location", location);
+        weather.put("date", date != null ? date : "today");
+        weather.put("weather", "sunny");
+        weather.put("temperature", "25°C");
+        weather.put("humidity", "60%");
+        return weather;
+    }
+
+    // Simulate stock API
+    public static Map<String, Object> getStockPrice(String symbol) {
+        Map<String, Object> stock = new HashMap<>();
+        stock.put("symbol", symbol);
+        stock.put("price", 150.25);
+        stock.put("change", "+2.5%");
+        return stock;
+    }
+
+    public static void main(String[] args) {
+        ZaiClient client = ZaiClient.builder().apiKey("your_api_key").build();
+
+        // Define function tools
+        Map<String, ChatFunctionParameterProperty> properties = new HashMap<>();
+        ChatFunctionParameterProperty locationProperty = ChatFunctionParameterProperty
+                .builder().type("string").description("City name, for example: Beijing").build();
+        properties.put("location", locationProperty);
+        ChatFunctionParameterProperty unitProperty = ChatFunctionParameterProperty
+                .builder().type("string").enums(Arrays.asList("celsius", "fahrenheit")).build();
+        properties.put("unit", unitProperty);
+        ChatTool weatherTool = ChatTool.builder()
+                .type(ChatToolType.FUNCTION.value())
+                .function(ChatFunction.builder()
+                        .name("get_weather")
+                        .description("Get weather information for a specified location")
+                        .parameters(ChatFunctionParameters.builder()
+                                .type("object")
+                                .properties(properties)
+                                .required(Collections.singletonList("location"))
+                                .build())
+                        .build())
+                .build();
+
+        // Create request
+        ChatCompletionCreateParams request = ChatCompletionCreateParams.builder()
+                .model(Constants.ModelChatGLM4_5)
+                .messages(Collections.singletonList(
+                        ChatMessage.builder()
+                                .role(ChatMessageRole.USER.value())
+                                .content("How's the weather in Beijing today?")
+                                .build()
+                ))
+                .tools(Collections.singletonList(weatherTool))
+                .toolChoice("auto")
+                .build();
+
+        // Send request
+        ChatCompletionResponse response = client.chat().createChatCompletion(request);
+
+        if (response.isSuccess()) {
+            // Handle function calling
+            ChatMessage assistantMessage = response.getData().getChoices().get(0).getMessage();
+            if (assistantMessage.getToolCalls() != null && !assistantMessage.getToolCalls().isEmpty()) {
+                for (ToolCalls toolCall : assistantMessage.getToolCalls()) {
+                    String functionName = toolCall.getFunction().getName();
+
+                    if ("get_weather".equals(functionName)) {
+                        Map<String, Object> result = getWeather("Beijing", null);
+                        System.out.println("Weather info: " + result);
+                    }
+                }
+            } else {
+                System.out.println(assistantMessage.getContent());
+            }
+        } else {
+            System.err.println("Error: " + response.getMsg());
+        }
+    }
+}