Create a langchain4j-core module

bom/camel-bom/pom.xml

@@ -1297,6 +1297,11 @@
         <artifactId>camel-langchain4j-chat</artifactId>
         <version>4.7.0-SNAPSHOT</version>
       </dependency>
+      <dependency>
+        <groupId>org.apache.camel</groupId>
+        <artifactId>camel-langchain4j-core</artifactId>
+        <version>4.7.0-SNAPSHOT</version>
+      </dependency>
       <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-langchain4j-embeddings</artifactId>

catalog/camel-allcomponents/pom.xml

@@ -1107,6 +1107,11 @@
             <artifactId>camel-langchain4j-chat</artifactId>
             <version>${project.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-langchain4j-core</artifactId>
+            <version>${project.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.apache.camel</groupId>
             <artifactId>camel-langchain4j-embeddings</artifactId>

components/camel-ai/camel-langchain4j-chat/pom.xml

@@ -40,9 +40,8 @@
             <artifactId>camel-support</artifactId>
         </dependency>
         <dependency>
-            <groupId>dev.langchain4j</groupId>
-            <artifactId>langchain4j</artifactId>
-            <version>${langchain4j-version}</version>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-langchain4j-core</artifactId>
         </dependency>
 
         <!-- for testing -->

components/camel-ai/camel-langchain4j-core/pom.xml

@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Licensed to the Apache Software Foundation (ASF) under one or more
+    contributor license agreements.  See the NOTICE file distributed with
+    this work for additional information regarding copyright ownership.
+    The ASF licenses this file to You 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
+
+         http://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.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <artifactId>camel-ai-parent</artifactId>
+        <groupId>org.apache.camel</groupId>
+        <version>4.7.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>camel-langchain4j-core</artifactId>
+    <packaging>jar</packaging>
+    <name>Camel :: LangChain4j :: Core</name>
+    <description>LangChain4j Core</description>
+
+    <properties>
+        <firstVersion>4.7.0</firstVersion>
+        <label>ai</label>
+        <title>LangChain4j Core</title>
+        <supportLevel>Experimental</supportLevel>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-support</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-core</artifactId>
+            <version>${langchain4j-version}</version>
+        </dependency>
+
+
+        <!-- test -->
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-test-junit5</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

components/camel-ai/camel-langchain4j-core/src/generated/java/org/apache/camel/component/langchain4j/core/LangChain4jConverterLoader.java

@@ -0,0 +1,54 @@
+/* Generated by camel build tools - do NOT edit this file! */
+package org.apache.camel.component.langchain4j.core;
+
+import javax.annotation.processing.Generated;
+
+import org.apache.camel.CamelContext;
+import org.apache.camel.CamelContextAware;
+import org.apache.camel.DeferredContextBinding;
+import org.apache.camel.Exchange;
+import org.apache.camel.TypeConversionException;
+import org.apache.camel.TypeConverterLoaderException;
+import org.apache.camel.spi.TypeConverterLoader;
+import org.apache.camel.spi.TypeConverterRegistry;
+import org.apache.camel.support.SimpleTypeConverter;
+import org.apache.camel.support.TypeConverterSupport;
+import org.apache.camel.util.DoubleMap;
+
+/**
+ * Generated by camel build tools - do NOT edit this file!
+ */
+@Generated("org.apache.camel.maven.packaging.TypeConverterLoaderGeneratorMojo")
+@SuppressWarnings("unchecked")
+@DeferredContextBinding
+public final class LangChain4jConverterLoader implements TypeConverterLoader, CamelContextAware {
+
+    private CamelContext camelContext;
+
+    public LangChain4jConverterLoader() {
+    }
+
+    @Override
+    public void setCamelContext(CamelContext camelContext) {
+        this.camelContext = camelContext;
+    }
+
+    @Override
+    public CamelContext getCamelContext() {
+        return camelContext;
+    }
+
+    @Override
+    public void load(TypeConverterRegistry registry) throws TypeConverterLoaderException {
+        registerConverters(registry);
+    }
+
+    private void registerConverters(TypeConverterRegistry registry) {
+        addTypeConverter(registry, dev.langchain4j.data.document.Document.class, java.lang.String.class, false,
+            (type, exchange, value) -> org.apache.camel.component.langchain4j.core.LangChain4jConverter.toDocument((java.lang.String) value, exchange));
+    }
+
+    private static void addTypeConverter(TypeConverterRegistry registry, Class<?> toType, Class<?> fromType, boolean allowNull, SimpleTypeConverter.ConversionMethod method) {
+        registry.addTypeConverter(toType, fromType, new SimpleTypeConverter(allowNull, method));
+    }
+}

components/camel-ai/camel-langchain4j-core/src/generated/resources/META-INF/services/org/apache/camel/TypeConverterLoader

@@ -0,0 +1,2 @@
+# Generated by camel build tools - do NOT edit this file!
+org.apache.camel.component.langchain4j.core.LangChain4jConverterLoader

components/camel-ai/camel-langchain4j-core/src/generated/resources/META-INF/services/org/apache/camel/other.properties

@@ -0,0 +1,7 @@
+# Generated by camel build tools - do NOT edit this file!
+name=langchain4j-core
+groupId=org.apache.camel
+artifactId=camel-langchain4j-core
+version=4.7.0-SNAPSHOT
+projectName=Camel :: LangChain4j :: Core
+projectDescription=LangChain4j Core

components/camel-ai/camel-langchain4j-core/src/generated/resources/langchain4j-core.json

@@ -0,0 +1,15 @@
+{
+  "other": {
+    "kind": "other",
+    "name": "langchain4j-core",
+    "title": "LangChain4j Core",
+    "description": "LangChain4j Core",
+    "deprecated": false,
+    "firstVersion": "4.7.0",
+    "label": "ai",
+    "supportLevel": "Experimental",
+    "groupId": "org.apache.camel",
+    "artifactId": "camel-langchain4j-core",
+    "version": "4.7.0-SNAPSHOT"
+  }
+}

components/camel-ai/camel-langchain4j-core/src/main/java/org/apache/camel/component/langchain4j/core/LangChain4j.java

@@ -0,0 +1,25 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *      http://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 org.apache.camel.component.langchain4j.core;
+
+public final class LangChain4j {
+    public static final String METADATA_PREFIX = "langchain4j.metadata.";
+    public static final int METADATA_PREFIX_LEN = METADATA_PREFIX.length();
+
+    private LangChain4j() {
+    }
+}

components/camel-ai/camel-langchain4j-core/src/main/java/org/apache/camel/component/langchain4j/core/LangChain4jConverter.java

@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *      http://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 org.apache.camel.component.langchain4j.core;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import dev.langchain4j.data.document.Document;
+import dev.langchain4j.data.document.Metadata;
+import org.apache.camel.Converter;
+import org.apache.camel.Exchange;
+
+/**
+ * Converter methods to convert from / to LangChain4j types.
+ */
+@Converter(generateLoader = true)
+public class LangChain4jConverter {
+
+    @Converter
+    public static Document toDocument(String value, Exchange exchange) {
+        return Document.document(
+                value,
+                toMetadata(exchange));
+    }
+
+    private static Metadata toMetadata(Exchange exchange) {
+        if (exchange == null) {
+            return new Metadata();
+        }
+        if (exchange.getMessage() == null) {
+            return new Metadata();
+        }
+
+        Map<String, Object> metadata = null;
+        Map<String, Object> headers = exchange.getMessage().getHeaders();
+
+        for (Map.Entry<String, Object> entry : headers.entrySet()) {
+            if (!entry.getKey().startsWith(LangChain4j.METADATA_PREFIX)) {
+                continue;
+            }
+
+            if (metadata == null) {
+                metadata = new HashMap<>();
+            }
+
+            metadata.put(
+                    entry.getKey().substring(LangChain4j.METADATA_PREFIX_LEN),
+                    entry.getValue());
+        }
+
+        return metadata != null ? Metadata.from(metadata) : new Metadata();
+    }
+}

components/camel-ai/camel-langchain4j-core/src/test/java/org/apache/camel/component/langchain4j/core/LangChain4jConverterTest.java

@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *      http://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 org.apache.camel.component.langchain4j.core;
+
+import dev.langchain4j.data.document.Document;
+import org.apache.camel.Exchange;
+import org.apache.camel.NoTypeConversionAvailableException;
+import org.apache.camel.support.DefaultExchange;
+import org.apache.camel.test.junit5.CamelTestSupport;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class LangChain4jConverterTest extends CamelTestSupport {
+
+    @Test
+    public void testConverter() throws NoTypeConversionAvailableException {
+        Document doc = context.getTypeConverter().mandatoryConvertTo(Document.class, "foo");
+        assertThat(doc.text()).isEqualTo("foo");
+
+        Exchange exchange = new DefaultExchange(context);
+        exchange.getMessage().setHeader(LangChain4j.METADATA_PREFIX + "meta1", 1);
+        exchange.getMessage().setHeader(LangChain4j.METADATA_PREFIX + "meta2", "baz");
+        exchange.getMessage().setHeader("meta3", "ignored");
+
+        Document docWithMetadata = context.getTypeConverter().mandatoryConvertTo(
+                Document.class,
+                exchange,
+                "bar");
+
+        assertThat(docWithMetadata.text()).isEqualTo("bar");
+        assertThat(docWithMetadata.metadata().toMap())
+                .containsEntry("meta1", 1)
+                .containsEntry("meta2", "baz")
+                .doesNotContainKey("meta3");
+    }
+}

components/camel-ai/camel-langchain4j-core/src/test/resources/log4j2.properties

@@ -0,0 +1,35 @@
+## ---------------------------------------------------------------------------
+## Licensed to the Apache Software Foundation (ASF) under one or more
+## contributor license agreements.  See the NOTICE file distributed with
+## this work for additional information regarding copyright ownership.
+## The ASF licenses this file to You 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
+##
+##      http://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.
+## ---------------------------------------------------------------------------
+
+appender.file.type = File
+appender.file.name = file
+appender.file.fileName = target/camel-langchain4j-core-test.log
+appender.file.layout.type = PatternLayout
+appender.file.layout.pattern = %d [%-15.15t] %-5p %-30.30c{1} - %m%n
+
+appender.out.type = Console
+appender.out.name = out
+appender.out.layout.type = PatternLayout
+appender.out.layout.pattern = [%30.30t] %-30.30c{1} %-5p %m%n
+
+rootLogger.level = INFO
+rootLogger.appenderRef.file.ref = file
+# To log to stdout
+#rootLogger.appenderRef.out.ref = out
+
+logger.camel-langchain4j-core.name = org.apache.camel.component.langchain4j.core
+logger.camel-langchain4j-core.level = DEBUG

components/camel-ai/camel-langchain4j-embeddings/pom.xml

@@ -48,9 +48,8 @@
             <artifactId>camel-support</artifactId>
         </dependency>
         <dependency>
-            <groupId>dev.langchain4j</groupId>
-            <artifactId>langchain4j-core</artifactId>
-            <version>${langchain4j-version}</version>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-langchain4j-core</artifactId>
         </dependency>
 
         <!-- test dependencies -->

components/camel-ai/pom.xml

@@ -36,6 +36,7 @@
     <modules>
         <module>camel-chatscript</module>
         <module>camel-djl</module>
+        <module>camel-langchain4j-core</module>
         <module>camel-langchain4j-chat</module>
         <module>camel-langchain4j-embeddings</module>
     </modules>

docs/components/modules/others/examples/json/langchain4j-core.json

@@ -0,0 +1 @@
+../../../../../../components/camel-ai/camel-langchain4j-core/src/generated/resources/langchain4j-core.json