/*
 * Copyright 2017 Graz University of Technology EAAF-Core Components has been developed in a
 * cooperation between EGIZ, A-SIT Plus, A-SIT, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European
 * Commission - subsequent versions of the EUPL (the "Licence"); You may not use this work except in
 * compliance with the Licence. You may obtain a copy of the Licence at:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the Licence
 * is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the Licence for the specific language governing permissions and limitations under
 * the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text file for details on the
 * various modules and licenses. The "NOTICE" text file is part of the distribution. Any derivative
 * works that you distribute must include a readable copy of the "NOTICE" text file.
*/

package at.gv.egiz.eaaf.core.impl.idp.process;

import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import at.gv.egiz.eaaf.core.api.idp.process.ExecutionContext;
import at.gv.egiz.eaaf.core.api.idp.process.ExpressionEvaluationContext;

/**
 * Context implementation used for expression evaluation only.
 *
 * @author tknall
 *
 */
public class ExpressionEvaluationContextImpl implements ExpressionEvaluationContext {

  private static final long serialVersionUID = 1L;

  private final Map<String, Serializable> ctxData;

  /**
   * Creates a new instance and initializes it with data from a given process
   * instance.
   *
   * @param processInstance The process instance.
   */
  ExpressionEvaluationContextImpl(final ProcessInstance processInstance) {
    final ExecutionContext executionContext = processInstance.getExecutionContext();
    final Set<String> keys = executionContext.keySet();
    ctxData = Collections.synchronizedMap(new HashMap<String, Serializable>(keys.size()));
    for (final String key : keys) {
      ctxData.put(key, executionContext.get(key));
    }
  }

  @Override
  public Map<String, Serializable> getCtx() {
    return Collections.unmodifiableMap(ctxData);
  }

}