/*******************************************************************************
 *******************************************************************************/
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 Map<String, Serializable> ctxData;

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

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

}