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The Core Camel Java DSL based router

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/**
 * 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.extension.metadata;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.camel.CamelContext;
import org.apache.camel.component.extension.MetaDataExtension;

public final class MetaDataBuilder {
    private final CamelContext camelContext;
    private Object payload;
    private Map attributes;

    private MetaDataBuilder(CamelContext camelContext) {
        this.camelContext = camelContext;
    }

    public MetaDataBuilder withPayload(Object payload) {
        this.payload = payload;
        return this;
    }

    public MetaDataBuilder withAttribute(String name, Object value) {
        if (this.attributes == null) {
            this.attributes = new HashMap<>();
        }

        this.attributes.put(name, value);
        return this;
    }

    public MetaDataExtension.MetaData build() {
        return new DefaultMetaData(
            camelContext,
            attributes == null ? Collections.emptyMap() : attributes,
            payload
        );
    }

    // *****************************
    //
    // *****************************

    public static MetaDataBuilder on(CamelContext camelContext) {
        return new MetaDataBuilder(camelContext);
    }
}