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/* 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
 * 
 *      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.activiti.springboot.integration;

import org.springframework.integration.mapping.HeaderMapper;
import org.springframework.messaging.MessageHeaders;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListSet;

/**

 */
public class ProcessVariableHeaderMapper implements HeaderMapper> {

    private final Set keysToPreserve = new ConcurrentSkipListSet();

    public ProcessVariableHeaderMapper(Set sync) {
        this.keysToPreserve.addAll(sync);
    }

    @Override
    public void fromHeaders(MessageHeaders headers, Map target) {
        // inbound SI msg. take the headers and convert it to
        sync(this.keysToPreserve, headers, target);
    }

    @Override
    public Map toHeaders(Map source) {
        Map matches = sync(
                this.keysToPreserve,
                source,
                new HashMap());
        return matches;
    }

    private static Map sync(
            Set keys,
            Map in,
            Map out) {
        for (String k : keys)
            if (in.containsKey(k))
                out.put(k, in.get(k));
        return out;
    }
}