org.camunda.bpm.engine.impl.dmn.result.CollectEntriesDecisionResultMapper Maven / Gradle / Ivy

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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.dmn.result;

import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.camunda.bpm.dmn.engine.DmnDecisionResult;
import org.camunda.bpm.engine.impl.ProcessEngineLogger;
import org.camunda.bpm.engine.impl.dmn.DecisionLogger;

/**
 * Maps the decision result to a list of untyped entries.
 *
 * @author Philipp Ossler
 */
public class CollectEntriesDecisionResultMapper implements DecisionResultMapper {

  protected static final DecisionLogger LOG = ProcessEngineLogger.DECISION_LOGGER;

  @Override
  public Object mapDecisionResult(DmnDecisionResult decisionResult) {
    if (decisionResult.isEmpty()) {
      return Collections.emptyList();

    } else {

      Set outputNames = collectOutputNames(decisionResult);
      if (outputNames.size() > 1) {
        throw LOG.decisionResultCollectMappingException(outputNames, decisionResult, this);

      } else {
        String outputName = outputNames.iterator().next();
        return decisionResult.collectEntries(outputName);
      }
    }
  }

  protected Set collectOutputNames(DmnDecisionResult decisionResult) {
    Set outputNames = new HashSet();

    for (Map entryMap : decisionResult.getResultList()) {
      outputNames.addAll(entryMap.keySet());
    }

    return outputNames;
  }

  @Override
  public String toString() {
    return "CollectEntriesDecisionResultMapper{}";
  }

}