Implements support for multimodal content in Agent messages.

(cherry picked from commit 78bbb25)

Author: iroqueta

java/src/main/java/com/genexus/util/saia/ContentDeserializer.java

@@ -0,0 +1,33 @@
+package com.genexus.util.saia;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.ObjectCodec;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+
+import java.io.IOException;
+import java.util.ArrayList;
+
+class ContentDeserializer extends JsonDeserializer<OpenAIResponse.Content> {
+	public ContentDeserializer() {}
+
+	@Override
+	public OpenAIResponse.Content deserialize(JsonParser p, DeserializationContext ct) throws IOException {
+		ObjectCodec codec = p.getCodec();
+		JsonNode node = codec.readTree(p);
+
+		if (node.isTextual()) {
+			return new OpenAIResponse.StringContent(node.asText());
+		} else if (node.isArray()) {
+			ArrayList<OpenAIResponse.StructuredContentItem> items = new ArrayList<>();
+			for (JsonNode itemNode : node) {
+				OpenAIResponse.StructuredContentItem item = codec.treeToValue(itemNode, OpenAIResponse.StructuredContentItem.class);
+				items.add(item);
+			}
+			return new OpenAIResponse.StructuredContent(items);
+		}
+
+		throw new IOException("Invalid content format");
+	}
+}

java/src/main/java/com/genexus/util/saia/ContentSerializer.java

@@ -0,0 +1,30 @@
+package com.genexus.util.saia;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializerProvider;
+
+import java.io.IOException;
+
+class ContentSerializer extends JsonSerializer<OpenAIResponse.Content> {
+	public ContentSerializer() {
+	}
+
+	@Override
+	public void serialize(OpenAIResponse.Content value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
+		ObjectMapper mapper = (ObjectMapper) gen.getCodec();
+
+		if (value instanceof OpenAIResponse.StringContent) {
+			gen.writeString(((OpenAIResponse.StringContent) value).getValue());
+		} else if (value instanceof OpenAIResponse.StructuredContent) {
+			gen.writeStartArray();
+			for (OpenAIResponse.StructuredContentItem item : ((OpenAIResponse.StructuredContent) value).getItems()) {
+				mapper.writeValue(gen, item);
+			}
+			gen.writeEndArray();
+		} else {
+			gen.writeNull();
+		}
+	}
+}